MGC COMMUNICATIONS INC
S-4/A, 1998-01-07
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>   1
 
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 7, 1998
    
   
                                                      REGISTRATION NO. 333-38875
    
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
   
                        PRE-EFFECTIVE AMENDMENT NO. 1 TO
    
 
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                             ---------------------
 
                            MGC COMMUNICATIONS, INC.
             (Exact name of registrant as specified in its charter)
                             ---------------------
 
   
<TABLE>
<S>                          <C>                          <C>
          NEVADA                        4813                      88-0360042
      (State or other             (Primary Standard            (I.R.S. Employer
      Jurisdiction of                Industrial               Identification No.)
     incorporation or        Classification Code Number)
       organization)

   3301 N. BUFFALO DRIVE                                     KENT F. HEYMAN, ESQ.
  LAS VEGAS, NEVADA 89129                                    3301 N. BUFFALO DRIVE
      (702) 310-1000                                        LAS VEGAS, NEVADA 89129
  (Address, including zip                                       (702) 310-1000
         code, and                                          (Address, including zip
telephone number including                                         code, and
        area code,                                        telephone number including
 of registrant's principal                                        area code,
    executive offices)                                       of agent for service)
</TABLE>
    
 
                             ---------------------
                                   COPIES TO:
 
                            ROBERT B. GOLDBERG, ESQ.
                 ELLIS, FUNK, GOLDBERG, LABOVITZ & DOKSON, P.C.
                      3490 PIEDMONT ROAD, N.E., SUITE 400
                             ATLANTA, GEORGIA 30305
                                 (404) 233-2800
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
     If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box:  [ ]
                             ---------------------
                        CALCULATION OF REGISTRATION FEE
 
   
<TABLE>
<CAPTION>
===================================================================================================================
                                                           PROPOSED             PROPOSED
                                        AMOUNT              MAXIMUM              MAXIMUM             AMOUNT OF
TITLE OF EACH CLASS OF SECURITIES        TO BE          OFFERING PRICE          AGGREGATE          REGISTRATION
        TO BE REGISTERED              REGISTERED        PER SECURITY(1)      OFFERING PRICE             FEE
- -------------------------------------------------------------------------------------------------------------------
<S>                                <C>                <C>                  <C>                  <C>
13% Senior Secured Notes due
  2004...........................    $160,000,000            100%             $160,000,000         $48,484.84(2)
==================================================================================================================
</TABLE>
    
 
(1) Estimated solely for the purpose of calculating the registration fee
    pursuant to Rule 457.
   
(2) Previously paid.
    
                             ---------------------
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
================================================================================
<PAGE>   2
 
                            MGC COMMUNICATIONS, INC.
 
                             CROSS REFERENCE SHEET
     PURSUANT TO ITEM 501(B) OF REGULATION S-K, SHOWING THE LOCATION IN THE
                                   PROSPECTUS
               OF THE INFORMATION REQUIRED BY PART I OF FORM S-4.
 
<TABLE>
<CAPTION>
           ITEM NUMBER AND CAPTION IN FORM S-4                    LOCATION OR CAPTION IN PROSPECTUS
           -----------------------------------                    ---------------------------------
<S>  <C>  <C>                                              <C>
A. INFORMATION ABOUT THE TRANSACTION.
      1.  Forepart of the Registration Statement and
            Outside Front Cover Page of Prospectus.......  Cover Page of Registration Statement; Cross
                                                             Reference Sheet; Outside Front Cover Page
      2.  Inside Front and Outside Back Cover Pages of
            Prospectus...................................  Inside Front Cover Page; Outside Back Cover
                                                           Page
      3.  Risk Factors, Ratio of Earnings to Fixed
            Charges and Other Information................  Prospectus Summary; Risk Factors; Business;
                                                             Selected Historical Financial Data
      4.  Terms of the Transaction.......................  Prospectus Summary; The Exchange Offer;
                                                             Description of the Exchange Notes; United
                                                             States Federal Income Tax Consequences of the
                                                             Exchange of Notes
      5.  Pro Forma Financial Information................  Prospectus Summary; Selected Historical
                                                           Financial Data
      6.  Material Contacts with the Company being
            Acquired.....................................  Not Applicable
      7.  Additional Information Required for Reoffering
            by Persons and Parties Deemed to be
            Underwriters.................................  Not Applicable
      8.  Interests of Named Experts and Counsel.........  Legal Matters
      9.  Disclosure of Commission Position on
            Indemnification for Securities Act
            Liabilities..................................  Not Applicable
B. INFORMATION ABOUT THE REGISTRANT.
     10.  Information With Respect to S-3 Registrants....  Not Applicable
     11.  Incorporation of Certain Information by
            Reference....................................  Not Applicable
     12.  Information With Respect to S-2 or S-3
            Registrants..................................  Not Applicable
     13.  Incorporation of Certain Information by
            Reference....................................  Not Applicable
     14.  Information With Respect to Registrants Other
            Than S-2 or S-3 Registrants..................  Prospectus Summary; Risk Factors;
                                                           Capitalization; Management's Discussion and
                                                             Analysis of Financial Condition and Results
                                                             of Operations; Selected Historical Financial
                                                             Data; Business; Management; Principal
                                                             Stockholders; Description of the Exchange
                                                             Notes; Financial Statements
C. INFORMATION ABOUT THE COMPANY BEING ACQUIRED.
     15.  Information With Respect to S-3 Companies......  Not Applicable
     16.  Information With Respect to S-2 or S-3
            Companies....................................  Not Applicable
     17.  Information With Respect to Companies Other
            Than S-2 or S-3 Companies....................  Not Applicable
D. VOTING AND MANAGEMENT INFORMATION.
     18.  Information if Proxies, Consents or Other
            Authorizations are to be Solicited...........  Not Applicable
     19.  Information if Proxies, Consents or Other
            Authorizations are not to be Solicited or in
            an Exchange Offer............................  Management
</TABLE>
<PAGE>   3
 
     INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
     REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
     SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR
     MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT
     BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR
     THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
     SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE
     UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS
     OF ANY SUCH STATE.
 
   
                  SUBJECT TO COMPLETION, DATED JANUARY 7, 1998
    
PROSPECTUS
[LOGO]                      MGC COMMUNICATIONS, INC.
 
                               OFFER TO EXCHANGE
                   13% SERIES B SENIOR SECURED NOTES DUE 2004
                                      FOR
               ALL OUTSTANDING 13% SENIOR SECURED NOTES DUE 2004
 
           THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK TIME
                  ON                  , 1998, UNLESS EXTENDED.
                             ---------------------
    MGC Communications, Inc., a Nevada corporation (the "Company"), hereby
offers, upon the terms and subject to conditions set forth in this Prospectus
(the "Prospectus") and the accompanying Letter of Transmittal (the "Letter of
Transmittal"; together with the Prospectus, the "Exchange Offer"), to exchange
up to an aggregate principal amount of $160,000,000 of its registered 13% Series
B Senior Secured Notes Due 2004 (the "Exchange Notes") for up to an aggregate
principal amount of $160,000,000 of its outstanding unregistered 13% Senior
Secured Notes Due 2004 (the "Outstanding Notes"). The terms of the Exchange
Notes are identical in all material respects to those of the Outstanding Notes,
except for certain transfer restrictions and registration rights relating to the
Outstanding Notes. The Exchange Notes will be issued pursuant to, and entitled
to the benefits of, the Indenture (as defined herein) governing the Outstanding
Notes. The Exchange Notes and the Outstanding Notes are sometimes referred to
collectively as the "Notes."
 
    Interest on the Notes will be payable semi-annually in arrears on April 1
and October 1 of each year, commencing April 1, 1998. At the closing of the sale
of the Notes, the Company used a portion of the net proceeds (approximately
$56.8 million) to purchase a portfolio of Government Securities (as defined)(the
"Pledged Securities") representing funds sufficient to provide for payment in
full of interest on the Notes through October 1, 2000. The Pledged Securities
are pledged as security for repayment of principal of and interest on the Notes.
In addition, the Notes are and will be secured by a security interest in certain
Telecommunications Equipment (as defined) currently owned by the Company and by
a first priority security interest in certain Telecommunications Equipment
acquired by the Company after the Issue Date (as defined). See "Description of
the Exchange Notes--Security."
 
    The Notes will be redeemable at the option of the Company, in whole or in
part, at any time on or after October 1, 2001, at the redemption prices set
forth herein plus accrued and unpaid interest and Liquidated Damages (as
defined), if any, to the date of redemption. In the event of a Change of
Control, holders of the Exchange Notes will have the right to require the
Company to purchase their Notes, in whole or in part, at a price equal to 101%
of the aggregate principal amount thereof, plus accrued and unpaid interest and
Liquidated Damages, if any, to the date of purchase.
 
   
    The Exchange Notes will be senior secured obligations of the Company, will
rank pari passu in right of payment with all existing and future senior
Indebtedness (as defined) of the Company, except with respect to the
Telecommunications Equipment securing the Notes, and will rank senior in right
of payment to any future subordinated Indebtedness of the Company. Holders of
other secured Indebtedness of the Company will, however, have claims prior to
the claims of the holders of the Notes with respect to the assets securing such
other Indebtedness. As of September 30, 1997, the Company had approximately
$156.7 million of debt outstanding, including the Notes. The Notes have been
recorded at $156.0 million to recognize that a portion of the proceeds from the
issuance of the Notes has been allocated to the value of the warrants issued to
the purchasers of the Notes. The indenture pursuant to which the Exchange Notes
will be issued limits the ability of the Company and its Restricted Subsidiaries
(as defined) to incur additional Indebtedness. The Company does not currently
have any subsidiaries.
    
 
    The Issuer will accept for exchange any and all Outstanding Notes which are
properly tendered in the Exchange Offer prior to 5:00 p.m., New York time, on
           , 1998, unless extended by the Company in its sole discretion (the
"Expiration Date"). The Exchange Offer will not in any event be extended to a
date beyond            , 1998. Tenders of Outstanding Notes may be withdrawn at
any time prior to 5:00 p.m., New York time, on the Expiration Date. If the
Company terminates the Exchange Offer and does not accept for exchange any
Outstanding Notes with respect to the Exchange Offer, the Company will promptly
return the Outstanding Notes to the holders thereof. The Exchange Offer is not
conditioned upon any minimum principal amount of Outstanding Notes being
tendered for exchange, but is otherwise subject to certain customary conditions.
The Outstanding Notes may be tendered only in integral multiples of $1,000.
                             ---------------------
   
     SEE "RISK FACTORS" BEGINNING ON PAGE 12 FOR CERTAIN INFORMATION THAT SHOULD
BE CONSIDERED IN CONNECTION WITH THE EXCHANGE OFFER.
    
                             ---------------------
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
                             ---------------------
   
               The date of this Prospectus is             , 1998.
    
<PAGE>   4
 
   
     The Exchange Notes are being offered hereunder in order to satisfy certain
obligations of the Company contained in the Registration Rights Agreement dated
September 29, 1997 (the "Registration Rights Agreement") by and among the
Company and Bear, Stearns & Co. Inc. and Furman Selz LLC, as the initial
purchasers (the "Initial Purchasers") with respect to the initial sale of the
Outstanding Notes. Based on positions taken by the staff of the Securities and
Exchange Commission (the "Commission") that have been enunciated in no-action
letters issued in Exxon Capital Holdings Corp. (available April 13, 1989) and
Morgan Stanley & Co. Inc. (available June 5, 1991), among others, the Exchange
Notes issued pursuant to the Exchange Offer in exchange for Outstanding Notes
may be offered for resale, resold and otherwise transferred by the respective
holders thereof (other than any such holder which is an "affiliate" of the
Issuer within the meaning of Rule 405 under the Securities Act of 1933, as
amended (the "Securities Act") or a broker dealer who acquired Outstanding Notes
directly from the Company to resell pursuant to Rule 144 or any other available
exemption under the Securities Act), without compliance with the registration
and prospectus delivery provisions of the Securities Act, provided that the
Exchange Notes are acquired in the ordinary course of such holder's business and
such holder has no arrangement with any person to participate in the
distribution of such Exchange Notes and is not engaged in and does not intend to
engage in a distribution of the Exchange Notes. Holders who wish to accept the
Exchange Offer must represent to the Company that they acquired the Notes in the
ordinary course of business, that they have no arrangement with any other person
to participate in the distribution of the Exchange Notes and that they are not
engaged, nor do they intend to engage in a distribution of the Exchange Notes.
Holders who tender Outstanding Notes in the Exchange Offer with the intention to
participate in a distribution of the Exchange Notes may not rely upon the Morgan
Stanley or similar no-action letters. Each broker-dealer that receives Exchange
Notes for its own account pursuant to the Exchange Offer must acknowledge that
it will deliver a prospectus in connection with any resale of such Exchange
Notes. The Letter of Transmittal states that by so acknowledging and by
delivering a prospectus, a broker-dealer will not be deemed to admit that it is
an "underwriter" within the meaning of the Securities Act. This Prospectus, as
it may be amended or supplemented from time to time, may be used by a
broker-dealer in connection with resales of the Exchange Notes received in
exchange for Outstanding Notes if such Exchange Notes were acquired by such
broker-dealer as a result of market-making activities or other trading
activities. The Company has agreed that, for a period of 365 days after the
effective date of the Registration Statement of which this Prospectus is a part,
it will make this Prospectus available to any broker-dealer for use in
connection with any such resale. See "Plan of Distribution."
    
 
     Prior to the Exchange Offer, there has been no public market for the
Exchange Notes. There can be no assurance as to the liquidity of any markets
that may develop for the Exchange Notes, the ability of holders to sell the
Exchange Notes or the price at which holders would be able to sell the Exchange
Notes. The Issuer does not intend to list the Exchange Notes for trading on any
national securities exchange or over-the-counter market system. Future trading
prices of the Exchange Notes will depend on many factors, including among other
things, prevailing interest rates, the Company's operating results and the
market for similar securities. Historically, the market for securities similar
to the Exchange Notes, including non-investment grade debt, has been subject to
disruptions that have caused substantial volatility in the prices of such
securities. There can be no assurance that any market for the Exchange Notes, if
such market develops, will not be subject to similar disruptions. The Initial
Purchasers have advised the Company that it currently intends to make a market
in the Exchange Notes offered hereby. However, the Initial Purchasers are not
obligated to do so and any market making may be discontinued at any time without
notice.
 
     The Company will not receive any proceeds from the Exchange Offer. The
Company has agreed to pay certain expenses incident to the Exchange Offer.
 
     NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR MAKE ANY REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS IN
CONNECTION WITH THE OFFERING COVERED BY THIS PROSPECTUS. IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER, OR A SOLICITATION
IN ANY JURISDICTION WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE SUCH
OFFER OR SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS, NOR ANY
DISTRIBUTION OF SECURITIES MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE
ANY IMPLICATION THAT THERE HAS NOT BEEN ANY CHANGE IN THE FACTS SET FORTH IN
THIS PROSPECTUS OR IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF.
 
                                       (i)
<PAGE>   5
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Available Information.......................................   (ii)
Summary of Prospectus.......................................     1
Risk Factors................................................    12
Use of Proceeds.............................................    18
Capitalization..............................................    19
The Exchange Offer..........................................    20
Selected Historical Financial Data..........................    27
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................    29
Business....................................................    33
Management..................................................    47
Principal Stockholders......................................    52
Certain Transactions........................................    54
Description of the Exchange Notes...........................    55
United States Federal Income Tax Consequences of the
  Exchange of Notes.........................................    85
Plan of Distribution........................................    85
Legal Matters...............................................    86
Experts.....................................................    86
Financial Statements........................................   F-1
</TABLE>
    
 
                             AVAILABLE INFORMATION
 
     The Company has filed with the Securities and Exchange Commission (the
"Commission") a Registration Statement on Form S-4 (the "Registration
Statement", which term shall include all amendments, exhibits, annexes and
schedules thereto) pursuant to the Securities Act, and the rules and regulations
promulgated thereunder, covering the Exchange Notes being offered hereby. This
Prospectus does not contain all the information set forth in the Registration
Statement, certain parts of which are omitted in accordance with the rules and
regulations of the Commission. Copies of such material can be obtained from the
Company upon request.
 
   
     The Company has agreed to file with the Commission, to the extent
permitted, and distribute to holders of the Exchange Notes reports, information
and documents specified in Section 13 and 15(d) of the Securities Exchange Act
of 1934, as amended (the "Exchange Act"), so long as the Exchange Notes are
outstanding, whether or not the Company is subject to such informational
requirements of the Exchange Act. Periodic reports, proxy statements and other
information filed by the Company with the Commission may be inspected at the
public reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, or at its regional offices located at the
Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661
and 7 World Trade Center, 13th Floor, New York, New York 10007. The Commission
maintains a Web site that contains reports, proxy and information statements and
other information regarding registrants that file electronically with the
Commission. Such Web site is located at http://www.sec.gov. While any Exchange
Notes remain outstanding, the Company will make available, upon request, to any
holder of the Exchange Notes, the information required pursuant to Rule
144A(d)(4) under the Securities Act during any period in which the Company is
not subject to Section 13 or 15(d) of the Exchange Act. Any such request should
be directed to the Vice President -- General Counsel of the Company at 3301 N.
Buffalo Drive, Las Vegas, Nevada, 89129, telephone number (702) 310-1000.
    
 
                                      (ii)
<PAGE>   6
 
                             SUMMARY OF PROSPECTUS
 
   
     The following summary is qualified in its entirety by, and should be read
in conjunction with, the information and financial statements (including the
notes thereto) included elsewhere in this Prospectus. Prospective investors
should carefully consider the factors set forth in "Risk Factors." References in
this Prospectus to the "Company" mean MGC Communications, Inc. Certain terms
used herein are defined in the Glossary attached hereto as Annex A. This
Prospectus contains certain "forward-looking statements" concerning the
Company's operations, economic performance and financial condition, which are
subject to inherent uncertainties and risks, including those identified under
"Risk Factors." Actual results could differ materially from those anticipated in
this Prospectus. When used in this Prospectus, the words "estimate," "project,"
"anticipate," "expect," "intend," "believe" and similar expressions are intended
to identify forward-looking statements. The safe harbor for forward-looking
statements provided in the Private Securities Litigation Reform Act of 1995 does
not apply to initial public offerings.
    
 
                                  THE COMPANY
 
   
     MGC Communications, Inc. ("MGC" or the "Company") is a rapidly growing,
switched-based provider of telecommunications services, offering competitive
local exchange ("CLEC") services to small business and residential users. The
Company focuses primarily on offering switched local dialtone and enhanced
calling features such as voice mail, call waiting and call forwarding ("basic
telephone services"). These services are required by virtually all users of
telecommunications. The Company does not currently offer long distance services,
but intends to integrate long distance services with its local service offerings
in Las Vegas during January 1998. The Company provides its basic telephone
services through the leasing of unbundled network elements provided by incumbent
local exchange carriers ("ILECs") and through the leasing of dedicated transport
to the Company's combined local and long distance Nortel DMS 500 switches. ILEC
refers to the incumbent monopoly provider of local exchange service prior to the
opening of local exchange services to competition. The ILEC may be a regional
Bell operating company (RBOC) or a non-RBOC incumbent (such as Sprint Central
Telephone of Nevada). The Company began its operations in Las Vegas in December
1996 and became operational in suburban Atlanta and Los Angeles in December
1997. The Company expects to commence offering long distance services to
customers in Atlanta and Los Angeles in first quarter 1998. At September 30,
1997, the Company had 12,482 access lines in service. Of the lines in service,
7,564 were business and 4,918 were residential. During September 1997, the
Company sold 2,851 access lines and placed 684 net lines in service. The Company
has used the results of its experience in Las Vegas to refine its strategy,
products and customer service procedures and to develop a sophisticated back
office operation.
    
 
     The Company intends to continue expanding its markets by targeting
residential and small business users in suburban areas of large metropolitan
markets. After the initiation of service in Atlanta and Los Angeles, the Company
intends to expand its operations to an additional seven markets in 1998 and an
additional seven markets in 1999. As of September 30, 1997, the Company has
obtained CLEC certification in four states (with one application pending), has
completed interconnection agreements with five ILECs (with an additional four in
negotiation) and has negotiated transport arrangements with a long distance
carrier.
 
     The Company believes the implementation of its network architecture
represents a low risk, demand driven approach requiring less capital deployment
than that required for the buildout of a fiber optic infrastructure. The
Company's network is comprised of leased, unbundled elements of the ILEC's
network coupled with the collocation of Company owned equipment in the ILEC's
central offices ("COs"). The Company adds transport capacity on an incremental
basis with the addition of new customers, and utilizes compression technology to
reduce its transport costs. Management believes the Company's network
architecture and equipment installation plans will enable it to (i) increase the
size of its addressable market to reach a significant number of potential
customers, and (ii) achieve efficient network operations and economies of scale
in sales and marketing.
 
     Management believes offering superior customer service is critical to
achieving its goal of capturing market share. The Company is continually
enhancing its service approach which utilizes a well-trained team of customer
sales and service representatives to coordinate customer installation, billing
and service. A
                                        1
<PAGE>   7
 
comprehensive back office support system is also a critical component of the
Company's service goal. The Company has installed a fully automated, proprietary
management information system which is designed to provide comprehensive,
integrated features addressing all aspects of its business, including customer
care and billing, general ledger, payroll, fixed asset management, purchasing
and personnel. The Company believes this system is readily adaptable to changing
circumstances and is scalable to support the Company's operations throughout its
expected growth.
 
     Key components of the Company's operating strategy are described below.
 
BUSINESS STRATEGY
 
     Early in Addressing Tier II Sectors of Tier I Markets.  In order to gain
and sustain a competitive advantage, the Company intends to move quickly to
implement its switch-based, unbundled transport networks. MGC believes it is
currently the only CLEC utilizing as its exclusive network strategy the
employment of combined local and long distance switches and unbundled transport
and local loops to target small business and residential customers in suburban
areas of Tier I markets. The Company is targeting these suburban areas because
they have concentrated numbers of basic telephone service users, such as small
businesses (3-50 lines), pay phone operators, multiple dwelling unit customers
and single family residences. The Company believes its only significant
switch-based competition is the ILEC in its target market segments.
 
     Success Based Capital Deployment.  Virtually all of the Company's planned
capital expenditures are related to switching and incremental infrastructure
resulting from additions of new revenue generating customers. Management
believes this provides for a low risk profile to the Company's planned capital
deployment and will provide an attractive return on invested capital.
 
     Provide Simplified Product Offerings.  MGC's target market segment is
comprised of basic telephone service users. While requiring sophistication for
their delivery, the Company's products and services are perceived as simple,
basic solutions. The Company has consciously narrowed its offerings, choosing
not to sell more complex telephone or data solutions or resell other complex
products at this time. Currently, the Company believes most CLECs which are
bundling such services are focused on larger businesses that require a wider
range of telecommunications products for their more sophisticated needs.
 
     Provide Superior Customer Service.  The Company believes superior customer
service will be critical to the success of its expansion plan. The Company's
proprietary customer-focused management information system allows immediate
access to the Company's customer data, enabling quick and effective responses to
customer requests and needs at any time. This system permits the Company to
present its customers with one fully integrated monthly billing statement for
all basic telephone services. In addition, by having a centralized call center
in Las Vegas, which will handle all inquiries and orders for new service, the
Company should be able to control personnel and related training to a greater
degree than if call centers were maintained in each market.
 
     Targeted Sales and Marketing Effort.  The Company's sales programs include
direct sales efforts, vendor and affinity programs, direct mail and
telemarketing. The Company has both local and national sales personnel. The
Company's national sales group concentrates on large basic telephone service
users such as multi-tenant buildings, pay phone operators and wholesale
customers. The local sales group coordinates activities with equipment vendors
and affinity groups and also assists with the national sales efforts. They also
make selective calls on business customers who have large basic telephone
service requirements which may not be solicited by the Company's national group.
 
     Leverage Sophisticated Information System and Centralized Call Center.  The
Company's proprietary management information system enables the user to record,
maintain and retrieve all customer information in one environment, including
such customer's services, equipment and billing.
 
     Capitalize on Management Expertise.  The Company has recruited a team of
experienced business executives with entrepreneurial backgrounds. Maurice J.
Gallagher, Jr., the Chairman, has been a founder of a number of start-up
businesses, including ValuJet and BankServ. Nield J. Montgomery, CEO and
President, has over 34 years of telephone experience, most recently with ICG
Communications, Inc. ("ICG"). Other
 
                                        2
<PAGE>   8
 
executives have held senior management positions at major telecommunications
companies, including, among others, Sprint, Centel, NYNEX, Contel and GTE.
 
NETWORK STRATEGY
 
     Accelerate Provision of Local Exchange Services.  To accelerate
provisioning of local exchange service, the Company selects larger markets with
a relatively cooperative ILEC and a pro-competitive regulatory environment. The
Telecommunications Act of 1996 (the "Act") significantly improved the
opportunity for competition in the local exchange market by mandating ILECs to
enter into agreements with competitors such as the Company for central office
collocation and unbundling of local services. The Company believes
implementation of such pro-competitive policies creates favorable opportunities
to more aggressively pursue the provisioning of local exchange services. The
Company has interconnection agreements in place with BellSouth
Telecommunications, Inc. ("BellSouth"), GTE, Pacific Bell ("PacBell"), Sprint
Central Telephone of Nevada, and Ameritech Information Industry Services
("Ameritech") and expects to have agreements with New England Telephone &
Telegraph Company ("NYNEX") in Massachusetts, Southwestern Bell Telephone
Company ("Southwestern Bell") in Texas, Bell Atlantic in Pennsylvania and
Central Telephone Company of Illinois. The Company believes it is
well-positioned to add switches and associated services with minimal increases
in support infrastructure.
 
     Low Cost Network Architecture.  One of the most critical elements of
creating a low cost structure is a service provider's decision as to the type of
network to build. MGC has chosen to exclusively build a switch-based network and
to lease the necessary transport and local loops on an incremental basis, as
demand dictates, from ILECs and CAP/CLECs. As a result, the Company will not be
burdened by the carrying cost of a constructed transport network. MGC believes
this low-cost approach will allow the Company to precisely target its capital
expenditures to the specifics of each market and developing conditions.
 
     The Company believes it will be able to lease the necessary transport at
reasonable prices. Prior to the Act, the ILEC's fiber transport was subject to
tariffs and usually priced substantially higher than a competing CAP/CLEC. With
the passage of the Act and subsequent state initiatives and introduction of
facilities-based competition, management believes network elements have become
available at cost-based prices and basic transport services have become
available at competitive prices. Most of MGC's targeted markets have numerous
competing transport suppliers with attractive unbundled transport prices.
 
     Control Customer Elements of the Networks.  Connection to customers
represents an important component of MGC's network strategy. Network control
issues of the Company's architecture are different from those of other CLECs.
MGC does not have to contend with local governments or landlords to obtain
permits or consents to construct its network, but rather with the ILEC to
acquire local loops. While this interface can be challenging, it has proven to
be a manageable process to date. Once a line has been leased from an ILEC, MGC
achieves control of its network similar to other CLECs. Specifically, all
changes to features, additions and billing are under the direct control of the
Company with the exception of repairs which are infrequent and may require the
participation of the ILEC's network maintenance staff.
 
     Create a Uniform Technological Platform.  A critical component of the
Company's low cost formula is the ability to standardize its switch
configuration. Unlike a traditional long distance or local switch, the Nortel
DMS 500 switch enables the Company to provide local and long distance services
from a single platform. The Company believes having a standardized switch
platform will enable it to (i) deploy features and functions quickly in all of
its networks, (ii) expand switch capacity in a cost effective manner, (iii)
lower maintenance costs through reduced training and spare parts requirements
and (iv) pursue a "switch in the box" rapid network deployment solution (under
development with Nortel) which should allow the Company to rapidly enter new
markets. In addition, the scalability and capacity of its switches will allow
the Company to switch calls from more than one market, which enhances the
Company's ability to benefit from a clustered approach to the building of its
networks.
 
                                        3
<PAGE>   9
 
                         RECENT REGULATORY DEVELOPMENTS
 
     The Act and the issuance by the Federal Communications Commission ("FCC")
of rules governing local competition, particularly those requiring the
interconnection of all networks and the exchange of traffic among the ILECs and
CLECs, as well as pro-competitive policies already developed by state regulatory
commissions, have caused fundamental changes in the structure of the local
exchange markets. On July 18, 1997, the U.S. Court of Appeals for the Eighth
Circuit issued a final decision vacating the FCC's interconnection pricing rules
and "most favored nation" rules as well as certain other FCC interconnection
rules. See "Business -- Regulation." Despite this action, the Company's analysis
shows interconnection arrangements that have been approved or mandated by state
regulatory commissions have been consistent with the intent of the Act and the
Company's business plan. On October 14, 1997, the U.S. Court of Appeals for the
Eighth Circuit ruled that ILECs are under no obligation to provide AT&T or
anyone else with a rebundled package of individual network elements. The Company
believes that the impact of this ruling is neutral to the Company in light of
the Company's switch-based network strategy employing unbundled network elements
and may be beneficial in the short-term by delaying entrance into the local
service market by IXC's such as AT&T.
 
     On May 16, 1997, the FCC released an order that fundamentally restructured
the "access charges" ILECs and CLECs charge to interexchange carriers and end
user customers. The Company believes the FCC's new access charge rules do not
adversely affect the Company's business plan, and they in fact present
significant opportunities for new entrants, including the Company. Aspects of
the access charge order may be changed in the future. At least ten parties have
filed appeals with federal courts, and numerous parties have asked the FCC to
reconsider portions of its new rules.
 
   
     On December 31, 1997, a federal judge in Dallas ruled key sections of the
Act unconstitutional on the grounds that RBOCs were unfairly denied access to
the long distance segment of the industry. The provisions held unconstitutional
require RBOCs to show sufficient cooperation in allowing access to their
networks before being approved to offer long distance services. This decision
was immediately appealed by numerous IXCs.
    
 
                               FINANCING STRATEGY
 
   
     The Company commenced operations in Las Vegas in December 1996 and became
operational in its targeted Atlanta and Los Angeles markets in December 1997.
The Company intends to expand its operations to an additional seven markets in
1998 and an additional seven markets in 1999. MGC expects the available net
proceeds of the sale of the Notes and the Preferred Stock Offering (as defined),
together with cash on hand, will be sufficient to finance this expansion, but it
will need to secure additional financing to enter new markets thereafter. The
Company's actual cash requirement for its expansion through 1999 will vary based
upon the timing and success of MGC's roll out of services in its targeted
markets. If demand for the Company's services is less than expected, the Company
may require additional financing at an earlier date although the Company should
be able to reduce certain costs that are, to a large extent, demand driven or
delay its entry into various of its targeted markets. See "Management's
Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources."
    
 
                               THE EXCHANGE OFFER
 
THE EXCHANGE NOTES.........  The form and terms of the Exchange Notes are
                             identical in all material respects to the terms of
                             the Outstanding Notes for which they may be
                             exchanged pursuant to the Exchange Offer, except
                             for certain transfer restrictions and registration
                             rights relating to the Outstanding Notes and except
                             for certain interest provisions relating to such
                             registration rights described below under
                             "Description of the Exchange Notes."
 
THE EXCHANGE OFFER.........  The Company is offering to exchange up to
                             $160,000,000 aggregate principal amount of
                             registered 13% Series B Senior Secured Notes due
                             2004 (the "Exchange Notes") for up to $160,000,000
                             aggregate principal amount of its outstanding
                             unregistered 13% Senior Secured Notes
                                        4
<PAGE>   10
 
                             due 2004 (the "Outstanding Notes"). Outstanding
                             Notes may be exchanged only in integral multiples
                             of $1,000.
 
EXPIRATION DATE; WITHDRAWAL
  OF TENDER................  The Exchange Offer will expire at 5:00 p.m., New
                             York time, on           1998, or such later date
                             and time to which it is extended by the Company.
                             The Exchange Offer will not in any event be
                             extended to a date beyond             , 1998. The
                             tender of Outstanding Notes pursuant to the
                             Exchange Offer may be withdrawn at any time prior
                             to the Expiration Date. Any Outstanding Notes not
                             accepted for exchange for any reason will be
                             returned without expense to the tendering holder
                             thereof as promptly as practicable after the
                             expiration or termination of the Exchange Offer.
 
CERTAIN CONDITIONS TO THE
  EXCHANGE OFFER...........  The Exchange Offer is subject to certain customary
                             conditions, which may be waived by the Company. See
                             "The Exchange Offer -- Certain Conditions to the
                             Exchange Offer."
 
PROCEDURES FOR TENDERING
  OUTSTANDING NOTES........  Each holder of Outstanding Notes wishing to accept
                             the Exchange Offer must either: (i) complete, sign
                             and date the Letter of Transmittal, or a facsimile
                             thereof, in accordance with the instructions
                             contained herein and therein, and mail or otherwise
                             deliver such Letter of Transmittal, or such
                             facsimile, together with such Outstanding Notes and
                             any other required documentation to the Exchange
                             Agent (as defined) at the address set forth herein,
                             or (ii) if such Outstanding Notes are tendered
                             pursuant to the procedures for book-entry transfer
                             set forth herein, a holder tendering Outstanding
                             Notes may transmit an Agent's Message (as defined)
                             to the Exchange Agent in lieu of the Letter of
                             Transmittal, in either case on or prior to the
                             Expiration Date. By executing the Letter of
                             Transmittal (or by having been deemed to have
                             executed the Letter of Transmittal, in the event of
                             delivery of an Agent's Message), each holder will
                             represent to the Company that, among other things,
                             (i) any Exchange Notes to be received by it will be
                             acquired in the ordinary course of its business,
                             (ii) it has no arrangement with any person to
                             participate in the distribution of the Exchange
                             Notes and (iii) it is not an "affiliate," as
                             defined in Rule 405 of the Securities Act, of the
                             Company or, if it is an affiliate, it will comply
                             with the registration and prospectus delivery
                             requirements of the Securities Act to the extent
                             applicable.
 
INTEREST ON THE EXCHANGE
  NOTES....................  The Exchange Notes will bear interest at the rate
                             of 13% per annum, payable semi-annually on April 1
                             and October 1, commencing April 1, 1998, to holders
                             of record on the immediately preceding March 15 and
                             September 15, respectively. Holders of the Exchange
                             Notes will receive interest on April 1, 1998 from
                             the later of the date of initial issuance of the
                             Outstanding Notes or the most recent date to which
                             interest has been paid thereon.
 
SPECIAL PROCEDURES FOR
  BENEFICIAL OWNERS........  Any beneficial owner whose Outstanding Notes are
                             registered in the name of a broker, dealer,
                             commercial bank, trust company or other nominee and
                             who wishes to tender such Outstanding Notes in the
                             Exchange Offer should contact such registered
                             holder to tender on such
                                        5
<PAGE>   11
 
                             beneficial owner's behalf. If such beneficial owner
                             wishes to tender on such owner's own behalf, such
                             owner must, prior to completing and executing the
                             Letter of Transmittal and delivering its
                             Outstanding Notes, either make appropriate
                             arrangements to register ownership of the
                             Outstanding Notes in such owner's name or obtain a
                             properly completed bond power from the registered
                             holder. The transfer of registered ownership may
                             take considerable time and may not be able to be
                             completed prior to the Expiration Date.
 
GUARANTEED DELIVERY
  PROCEDURES...............  Holders of Notes who wish to tender their
                             Outstanding Notes and whose Outstanding Notes are
                             not immediately available or who cannot deliver
                             their Outstanding Notes, the Letter of Transmittal
                             or any other documents required by the Letter of
                             Transmittal to the Exchange Agent prior to the
                             Expiration Date, must tender their Outstanding
                             Notes according to the guaranteed delivery
                             procedures set forth in "The Exchange
                             Offer -- Guaranteed Delivery Procedures."
 
REGISTRATION
  REQUIREMENTS.............  The Company has agreed to use its best efforts to
                             consummate the Exchange Offer to offer holders of
                             the Outstanding Notes an opportunity to exchange
                             their Outstanding Notes for the Exchange Notes
                             which will be issued without legends restricting
                             the transfer thereof. If the Company is not
                             permitted to effect the Exchange Offer under
                             certain previously enunciated positions of the
                             staff of the Commission, or in certain other
                             circumstances, the Company has agreed to file a
                             shelf registration statement (the "Shelf
                             Registration Statement") covering resales of the
                             Outstanding Notes and to use its best efforts to
                             cause the Shelf Registration Statement to be
                             declared effective under the Securities Act and,
                             subject to certain exceptions, keep the Shelf
                             Registration Statement effective until 365 days
                             after the effective date thereof.
 
CERTAIN FEDERAL INCOME TAX
  CONSIDERATIONS...........  For a discussion of certain federal income tax
                             considerations relating to the exchange of Notes,
                             see "United States Federal Income Tax Consequences
                             of the Exchange of Notes."
 
USE OF PROCEEDS............  There will be no proceeds to the Company from the
                             exchange of Notes pursuant to the Exchange Offer.
 
EXCHANGE AGENT.............  Marine Midland Bank is the Exchange Agent. The
                             address and telephone number of the Exchange Agent
                             are set forth in "The Exchange Offer -- Exchange
                             Agent."
 
                               THE EXCHANGE NOTES
 
MATURITY...................  October 1, 2004.
 
INTEREST...................  The Exchange Notes will bear interest at the rate
                             of 13% per annum, payable semi-annually in arrears
                             on April 1 and October 1, commencing April 1, 1998.
 
RANKING....................  The Exchange Notes will be senior secured
                             obligations of the Company, will rank pari passu in
                             right of payment with all existing and future
                             senior Indebtedness of the Company, except with
                             respect to the Telecommunications Equipment
                             securing the Notes, and will rank senior in right
                             of payment to any future subordinated Indebtedness
                             of the Com-
                                        6
<PAGE>   12
 
   
                             pany. Holders of secured Indebtedness of the
                             Company will, however, have claims prior to the
                             claims of the holders of the Notes with respect to
                             the assets securing such other Indebtedness. As of
                             September 30, 1997, the total amount of debt
                             outstanding of the Company was approximately $156.7
                             million. The Notes have been recorded at $156.0
                             million to recognize that a portion of the proceeds
                             from the issuance of the Notes has been allocated
                             to the value of the warrants issued to the
                             purchasers of the Notes.
    
 
SECURITY...................  At the closing of the sale of the Notes, the
                             Company used a portion of the net proceeds thereof
                             (approximately $56.8 million) to purchase Pledged
                             Securities representing funds sufficient to provide
                             for payment in full of interest on the Notes
                             through October 1, 2000 and as security for
                             repayment of principal of and interest on the
                             Notes. Proceeds from the Pledged Securities may be
                             used by the Company to make interest payments on
                             the Notes through October 1, 2000. The actual
                             amount of the net proceeds used to purchase Pledged
                             Securities may vary depending upon the interest
                             rates on Government Securities prevailing at the
                             time of the purchase of the Pledged Securities. The
                             Pledged Securities will be held by the Trustee (as
                             defined) under the Pledge Agreement (as defined)
                             pending disbursement. In addition, the Exchange
                             Notes will be secured by a security interest in
                             certain Telecommunications Equipment currently
                             owned by the Company and by a first priority
                             security interest in certain Telecommunications
                             Equipment acquired by the Company after the Issue
                             Date and prior to such time as the aggregate dollar
                             value of the Company's purchases of
                             Telecommunications Equipment subsequent to the
                             Issue Date securing the Notes equals $100.0
                             million. See "Description of the Exchange
                             Notes--Security."
 
OPTIONAL REDEMPTION........  The Notes may be redeemed at the option of the
                             Company, in whole or in part, on or after October
                             1, 2001, at a premium declining to par in 2003,
                             plus accrued and unpaid interest and Liquidated
                             Damages, if any, through the redemption date.
 
                             In the event of a sale by the Company prior to
                             October 1, 2000 of its capital stock (other than
                             Disqualified Stock (as defined)) in one or more
                             Equity Offerings (as defined), up to a maximum of
                             35% of the aggregate principal amount of the Notes
                             originally issued will, at the option of the
                             Company, be redeemable from the net cash proceeds
                             thereof (but only to the extent such proceeds
                             consist of cash or readily marketable cash
                             equivalents) at a redemption price equal to 113% of
                             the principal amount thereof, plus accrued and
                             unpaid interest and Liquidated Damages, if any,
                             thereon to the redemption date, provided at least
                             65% of the aggregate principal amount of Notes
                             originally issued remain outstanding immediately
                             after the occurrence of such redemption.
 
   
CHANGE OF CONTROL..........  In the event of a Change of Control, the holders of
                             the Notes will have the right to require the
                             Company to purchase the Notes at a price equal to
                             101% of the aggregate principal amount thereof,
                             plus accrued and unpaid interest and Liquidated
                             Damages, if any, to the date of purchase. A Change
                             of Control may occur upon the sale of all or
                             substantially all of the assets of the Company, the
                             adoption of a plan of liquidation or dissolution of
                             the Company or certain significant changes in the
                             ownership or the Board of Directors of the Company.
                             See "Description of the Exchange Notes -- Certain
                             Definitions." This provision will not protect the
                             holders of the Notes in the event the Company
                             becomes highly
    
                                        7
<PAGE>   13
 
   
                             leveraged or engages in a transaction resulting in
                             the assumption of a substantial amount of
                             indebtedness. The Company does not currently have
                             outstanding any other indebtedness or any preferred
                             stock that would be subject to acceleration or
                             redemption upon a Change of Control.
    
 
COVENANTS..................  The indenture pursuant to which the Exchange Notes
                             will be issued (the "Indenture") contains certain
                             covenants that, among other things, limit the
                             ability of the Company and its Restricted
                             Subsidiaries to make certain restricted payments,
                             incur additional indebtedness and issue preferred
                             stock, pay dividends or make other distributions,
                             repurchase equity interests or subordinated
                             indebtedness, acquire an aggregate of more than 20
                             switches until Consolidated EBITDA (as defined) is
                             positive for each of two consecutive quarters (with
                             certain exceptions), engage in sale and leaseback
                             transactions, create certain liens, enter into
                             certain transactions with affiliates, sell assets
                             of the Company or its Restricted Subsidiaries,
                             conduct certain lines of business, issue or sell
                             equity interests of the Company's Restricted
                             Subsidiaries or enter into certain mergers and
                             consolidations. In addition, under certain
                             circumstances, the Company will be required to
                             offer to purchase the Notes at a price equal to
                             100% of the principal amount thereof, plus accrued
                             and unpaid interest and Liquidated Damages, if any,
                             to the date of purchase, with the proceeds of
                             certain asset sales. See "Description of the
                             Exchange Notes--Certain Covenants."
 
EXCHANGE OFFER;
REGISTRATION RIGHTS;
LIQUIDATED
DAMAGES....................  Pursuant to a Registration Rights Agreement (the
                             "Registration Rights Agreement") between the
                             Company and the Initial Purchasers, the Company has
                             agreed to file a registration statement (the
                             "Exchange Offer Registration Statement") with
                             respect to an offer to exchange (the "Exchange
                             Offer") the Notes for Exchange Notes (as defined).
                             If (1) the Exchange Offer is not permitted by
                             applicable law or (2) any holder of Transfer
                             Restricted Securities (as defined) notifies the
                             Company that (A) it is prohibited by law or
                             Commission policy from participating in the
                             Exchange Offer, (B) it may not resell the Exchange
                             Notes acquired by it in the Exchange Offer to the
                             public without delivering a prospectus and the
                             prospectus contained in the Exchange Offer
                             Registration Statement is not appropriate or
                             available for such resales or (C) it is a
                             broker-dealer and holds Notes acquired directly
                             from the Company or an affiliate of the Company,
                             the Company will be required to provide a shelf
                             registration statement (the "Shelf Registration
                             Statement") to cover resales of such Transfer
                             Restricted Securities by the holders thereof. The
                             Registration Statement of which this Prospectus is
                             a part has been filed to satisfy the Company's
                             obligation to file the Exchange Offer Registration
                             Statement. If the Company fails to satisfy these
                             registration obligations, it will be required to
                             pay liquidated damages ("Liquidated Damages") to
                             the affected holders of Notes under certain
                             circumstances. See "Description of the Exchange
                             Notes--Registration Rights; Liquidated Damages."
                                        8
<PAGE>   14
 
     For additional information concerning the Notes and the definitions of
certain capitalized terms used above, see "Description of the Exchange Notes"
and "United States Federal Income Tax Consequences of the Exchange of Notes."
 
                                  RISK FACTORS
 
   
     See "Risk Factors" on page 12 for a discussion of certain factors that
should be considered by holders of Outstanding Notes prior to tendering
outstanding Notes in the Exchange Offer.
    
 
                                        9
<PAGE>   15
 
                             SUMMARY FINANCIAL DATA
 
   
     The following summary financial data of the Company as of and for the year
ended December 31, 1996, under the captions "Statement of Operations Data,"
"Other Financial Data" and "Balance Sheet Data" are derived from the financial
statements of the Company, which financial statements have been audited by KPMG
Peat Marwick LLP, independent certified public accountants. The financial
statements as of and for the year ended December 31, 1996 are included elsewhere
in this Prospectus. The following summary financial data of the Company as of
and for the nine months ended September 30, 1997 and 1996 under the captions
"Statement of Operations Data," "Other Financial Data," and "Balance Sheet Data"
are derived from the unaudited financial statements of the Company included
elsewhere in this Prospectus. The unaudited financial statements include all
adjustments, consisting of normal recurring accruals, which the Company
considers necessary for a fair presentation of the financial position and the
results of operations for these periods. Operating results for the nine months
ended September 30, 1997 and 1996 are not necessarily indicative of the results
that may be expected for the entire year. The information presented below under
the caption "Operating Data" is unaudited. The data should be read in
conjunction with the financial statements, related notes and other financial
information included elsewhere in this Prospectus, as well as "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
    
 
   
<TABLE>
<CAPTION>
                                                                               NINE MONTHS ENDED
                                                                                 SEPTEMBER 30,
                                                            YEAR ENDED        -------------------
                                                         DECEMBER 31, 1996     1996        1997
                                                         -----------------    -------    --------
                                                           (IN THOUSANDS EXCEPT OPERATING DATA)
<S>                                                      <C>                  <C>        <C>
STATEMENT OF OPERATIONS DATA:(1)
Operating revenues.....................................       $     1         $    --    $  1,924
Cost of operating revenues (excluding depreciation
  shown below).........................................           305              44       2,512
Selling, general and administrative expenses...........           841             359       3,954
Depreciation and amortization expense..................            54              --         818
Write-off of purchased software........................           355              --          --
                                                              -------         -------    --------
Loss from operations...................................        (1,554)           (403)     (5,360)
Interest income........................................            63              31         338
Interest expense.......................................            --              --        (117)
                                                              -------         -------    --------
Net loss...............................................       $(1,491)        $  (372)   $ (5,139)
                                                              =======         =======    ========
Net loss per share of common stock(2)..................       $ (1.27)        $ (0.40)   $   (.37)
                                                              =======         =======    ========
 
OTHER FINANCIAL DATA:
 
EBITDA(3)..............................................       $(1,145)        $  (403)   $ (4,542)
Summary Cash Flow Information:
  Net cash used in operating activities................          (942)         (2,772)     (4,339)
  Net cash used in investing activities................        (2,287)           (308)    (68,180)
  Net cash provided by financing activities............        11,126           3,080     160,012
Capital expenditures...................................         3,659             308      15,907
Ratio of earnings to fixed charges(4)..................            --              --          --
Deficiency of earnings to fixed charges(4).............        (1,491)           (372)     (5,256)
 
OPERATING DATA (END OF PERIOD):
Total access lines.....................................            50              --      12,482
  Business.............................................            --              --       7,564
  Residential..........................................            50              --       4,918
Central office collocation sites.......................             9              --          16
</TABLE>
    
 
                                       10
<PAGE>   16
 
   
<TABLE>
<CAPTION>
                                                   AS OF              AS OF SEPTEMBER 30, 1997
                                                DECEMBER 31,   ---------------------------------------
                                                    1996            ACTUAL             AS ADJUSTED(5)
                                                ------------   -----------------      ----------------
                                                                (DOLLARS IN THOUSANDS)
<S>                                             <C>            <C>                    <C>
BALANCE SHEET DATA:
Cash and cash equivalents (excluding
  restricted investments).....................    $ 7,897           $95,390              $ 112,042
Restricted investments(6).....................         --            56,767                 56,767
Property and equipment, net...................      3,250            18,339                 18,339
Total assets..................................     12,339           178,026                194,678
Long-term debt, including current
  maturities..................................         --           156,589                156,589
Redeemable Series A Convertible Preferred
  Stock.......................................         --                --                 16,652
Stockholders' equity..........................     10,792            14,808                 14,808
</TABLE>
    
 
- ---------------
   
(1) Statement of operations data for the year ended December 31, 1995 has been
    omitted as no revenues or expenses were recognized and no cash transactions
    occurred between October 16, 1995 (inception) to December 31, 1995.
    
 
   
(2) Net loss per common share outstanding is calculated based on weighted
    average shares outstanding of 1,178,932 for the year ended December 31, 1996
    and 13,917,204 and 936,264 for the nine months ended September 30, 1997 and
    1996, respectively.
    
 
   
(3) EBITDA consists of earnings before interest, income taxes, depreciation and
    amortization. For the year ended December 31, 1996, EBITDA excludes a charge
    of $355,000 related to the one-time write-off of purchased software. While
    EBITDA is not an alternative indicator of operating performance to operating
    income or an alternative to cash flows from operating activities as a
    measure of liquidity as defined by generally accepted accounting principles
    and EBITDA may not be comparable to other similarly titled measures of other
    companies, management believes that EBITDA is a measure commonly used in the
    telecommunications industry to analyze and compare telecommunications
    companies on the basis of operating performance, leverage and liquidity. See
    the Statements of Cash Flows included in the Company's financial statements
    and the notes thereto appearing elsewhere in this Prospectus. EBITDA as
    defined in this footnote is not equivalent to Consolidated EBITDA as defined
    in the "Description of the Exchange Notes."
    
 
   
(4) The ratio of earnings to fixed charges is calculated by dividing earnings
    (loss) before income taxes, plus fixed charges excluding capitalized
    interest by fixed charges. For the year ended December 31, 1996 and for the
    nine months ended September 30, 1996, the Company incurred net losses and
    had no fixed charges. For the nine months ended September 30, 1997, the
    Company had net losses of approximately $5.1 million and had fixed charges
    of approximately $.1 million.
    
 
   
(5) Gives effect to the issuance in November 1997 of 5,148,570 shares of Series
    A Convertible Preferred Stock (the "Preferred Stock") resulting in net
    proceeds to the Company of $16,652,000 (the "Preferred Stock Offering").
    Commencing at any time on or after October 2, 2004, at the option and
    written election of the holders of a majority of the outstanding shares of
    the Preferred Stock, the Company shall, subject to applicable law, redeem
    all of the outstanding shares of Preferred Stock at the price equal to the
    greater of: (i) $3.50, plus an amount equal to any unpaid dividends thereon,
    or (ii) the market value of the Preferred Stock, on an as converted basis,
    determined by an independent appraiser. Dividends on the Preferred Stock
    accumulate whether or not the Company has earnings or profits, whether or
    not there are funds available for the payment of dividends and whether or
    not dividends are declared.
    
 
   
(6) A portion of the proceeds of the sale of the Notes has been used to purchase
    Government Securities representing funds sufficient to provide for payment
    in full of the first six interest payments on the Notes and which will be
    pledged as security for repayment of the principal of and interest on the
    Notes. See "Description of the Exchange Notes--Security."
    
                                       11
<PAGE>   17
 
                                  RISK FACTORS
 
     Prior to tendering Outstanding Notes in the Exchange Offer, holders of
Outstanding Notes should consider carefully the following factors, in addition
to other information set forth elsewhere in this Prospectus.
 
   
     Substantial Indebtedness; Insufficiency of Earnings to Cover Fixed
Charges.  Following the sale of the Notes and the Preferred Stock Offering, the
Company is highly leveraged. At September 30, 1997, the Company had
approximately $156.7 million in aggregate principal amount of indebtedness
outstanding. The Notes have been recorded at $156.0 million to recognize that a
portion of the proceeds from the issuance of the Notes has been allocated to the
value of the warrants issued to the purchasers of the Notes. The degree to which
the Company is leveraged could have important consequences to holders of the
Notes, including the following: (i) a substantial portion of the Company's cash
flow from operations will be dedicated to payment of the principal and interest
on its indebtedness, thereby reducing funds available for other purposes; (ii)
the Company's significant degree of leverage could increase its vulnerability to
changes in general economic conditions or increases in prevailing interest
rates; (iii) the Company's ability to obtain additional financing for working
capital, capital expenditures, acquisitions, general corporate purposes or other
purposes could be impaired; and (iv) the Company may be more leveraged than
certain of its competitors, which may be a competitive disadvantage.
    
 
   
     For the nine months ended September 30, 1997, the Company had net losses of
$5,139,000 and incurred fixed charges of $117,000. The Company anticipates
earnings will be insufficient to cover fixed charges through 1999. In order for
the Company to meet its debt service obligations, the Company will need to
substantially improve its operating results. There can be no assurance the
Company's operating results will be of sufficient magnitude to enable the
Company to meet its debt service obligations. In the absence of such operating
results, the Company could face substantial liquidity problems and might be
required to seek additional financing through the issuance of debt or equity
securities; however, there can be no assurance the Company would be successful
in raising such financing, or the terms or timing thereof. See "Management's
Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources."
    
 
     Limited Operations; Net Losses.  The Company began providing local exchange
services in December 1996. Substantially all of the Company's revenues to date
have been derived from local exchange services. The Company is expecting to add
long distance services and substantially increase the size of its operations in
the near future. Prospective investors, therefore, have limited historical
financial information about the Company upon which to base an evaluation of the
Company's performance. Given the Company's limited operating history, there is
no assurance that it will be able to compete successfully in the
telecommunications business.
 
     The development and expansion of the Company's business require significant
capital, operational and administrative expenditures, a substantial portion of
which are incurred before the realization of revenues. These capital
expenditures will result in negative cash flow until an adequate customer base
is established. Although its revenues have increased since its inception, the
Company has incurred significant increases in expenses associated with the
installation of switches and expansion of its services and customer base. The
Company anticipates recording a significant net loss through 1999. There can be
no assurance the Company will achieve or sustain profitability or positive
EBITDA thereafter.
 
     Although many of the Company's managerial and supervisory personnel have
had substantial telecommunications industry experience, the Company has a very
limited operating history. Accordingly, there is no firm basis, other than
Management's judgment, on which to estimate the number of customers or the
amount of revenues the Company's planned operations will generate.
 
     Risks of Implementation, Sites, Equipment and Suitable Interconnect
Arrangements.  The Company intends to develop and expand the Company's business
and enter new markets as described elsewhere in this Prospectus. There can be no
assurance the Company will be able to develop and expand its business or enter
new markets as currently planned. The development and expansion of the Company's
business and its entry into new markets will be dependent, among other things,
on its ability to lease or purchase suitable sites, obtain equipment on a timely
basis, negotiate suitable interconnection arrangements with ILECs on
satisfactory terms and conditions and finance such expansion. These factors and
others could adversely affect
 
                                       12
<PAGE>   18
 
the expansion of the Company's customer base and commencement of operations in
new markets. If the Company is not able to expand or enter new markets in
accordance with its plans, the growth of its business would be materially
adversely affected.
 
   
     Significant Capital Requirements and Need for Additional
Financing.  Expansion and development of the Company's business and services and
the development of new markets require significant capital expenditures. The
Company expects to fund its capital requirements through existing resources,
debt or equity financing and internally generated funds, including capital
raised through the sale of the Notes and the Preferred Stock Offering. The
Company expects that to continue to expand its business will require raising
substantial additional equity and/or debt capital. There can be no assurance,
however, the Company will be successful in raising sufficient debt or equity
capital on terms it will consider acceptable. In addition, the Company's future
capital requirements will depend upon a number of factors, including marketing
expenses, staffing levels and customer growth, as well as other factors that are
not within the Company's control, such as competitive conditions, government
regulation and capital costs. Failure to generate sufficient funds may require
the Company to delay or abandon some of its future expansion or expenditures,
which would have a material adverse effect on its growth and its ability to
compete in the telecommunications industry.
    
 
     Expansion Risk.  The Company expects to expand rapidly. This growth will
increase the operating complexity of the Company as well as the level of
responsibility for both existing and new management personnel. The Company's
ability to manage its expansion effectively will require it to continue to
implement and improve its operational and financial systems and to expand, train
and manage its employee base. The Company's inability to effectively manage its
expansion could have a material adverse effect on its business.
 
     Effect of Substantial Additional Indebtedness on the Company's Ability to
Repay the Notes.  The Company may incur substantial additional indebtedness in
the future to finance the entry into new markets, the purchase of equipment and
increases in capacity. Additional indebtedness of the Company may rank pari
passu with the Notes in certain circumstances. See "Description of the Exchange
Notes." The debt service requirements of any additional indebtedness could make
it more difficult for the Company to make principal and interest payments on the
Notes.
 
     Reliance on Others.  Because the Company has elected to lease transport
capacity, it is dependent upon the cooperation of ILECs and/or CAP/CLECs whose
fiber optic networks and local loops are being leased by the Company. The risks
inherent in this approach include, but are not limited to, negotiating and
renewing favorable interconnection agreements; timeliness of the ILEC or
CAP/CLECs in processing the Company's orders for customers who seek to utilize
the Company's service; and maintenance of the unbundled network elements (UNEs).
The ILECs have had little experience in providing UNEs and there can be no
assurance the ILECs will provide and maintain the UNEs in a prompt and efficient
manner. The Company's interconnection agreements currently provide the Company's
connection and maintenance orders will receive attention at parity with the
ILECs or other CAP/CLECs customers and the ILEC will provide adequate trunking
capacity to keep blockage within industry standards. Accordingly, the Company
and its customers are dependent on the ILEC and/or CAP/CLEC to assure
uninterrupted service. In Las Vegas, the Company has experienced excessive
blockage, from time to time, in the delivery of calls from the ILEC to the
Company due to inadequate trunk provisioning by the ILEC. Blocked calls result
in customer dissatisfaction and risk the loss of Company business. There can be
no assurance ILECs will comply with their network provisioning requirements.
Furthermore, there can be no assurance the rates to be charged to the Company
under the interconnection agreements will allow the Company to offer low enough
usage rates to attract a sufficient number of customers and to also operate the
business profitably.
 
     Dependence on Key Personnel.  The Company's business is managed by a small
number of key management and operating personnel, the loss of certain of whom
could have a material adverse impact on the Company's business. The Company
believes that its future success will depend in large part on its continued
ability to attract and retain highly skilled and qualified personnel. None of
the Company's key executives is a party to a long-term employment agreement with
the Company. The Company does not maintain key man insurance on its officers.
 
                                       13
<PAGE>   19
 
   
     Control of the Company; Conflicts of Interest.  As of November 30, 1997,
Maurice J. Gallagher, Jr., Nield J. Montgomery, Timothy P. Flynn and Robert L.
and Carol A. Priddy owned, directly or indirectly, in the aggregate
approximately 47% of the outstanding Common Stock and voting power of the
Company (assuming the conversion of the outstanding Preferred Stock for Common
Stock). Accordingly, such stockholders collectively are able to control the
management policy of the Company and all fundamental corporate actions,
including mergers, substantial acquisitions and dispositions, and election of
the Board of Directors of the Company.
    
 
     Certain decisions concerning the operations or financial structure of the
Company may present conflicts of interest between the Company's stockholders and
the holders of the Notes. For example, if the Company encounters financial
difficulties or is unable to pay its debts as they mature, the interests of the
Company's stockholders might conflict with those of the holders of the Notes. In
addition, the Company's stockholders may have an interest in pursuing
acquisitions, divestitures, financings or other transactions that, in their
judgment, could enhance their equity investment, even though such transactions
might involve risk to the holders of the Notes. Because certain significant
stockholders of the Company are able to control the management policy of the
Company and all fundamental corporate actions, any such conflict of interest may
be resolved in favor of the Company's stockholders to the detriment of the
holders of the Notes.
 
     Automation.  The Company employs a proprietary management information
system which is expected to be an important factor in its success. If the
proprietary management information system fails or is unable to perform as
represented, it would have a substantial adverse effect on the Company.
Furthermore, problems may be encountered with higher volumes or with additional
automation features, in which case, the Company might experience system
breakdowns, delays and additional, unbudgeted expense to remedy the defect or to
replace the defective system with an alternative system.
 
     Nortel Contract.  The Company is obligated to purchase 20 Nortel DMS 500
switches (two of which have already been delivered) by the end of 1999. There
can be no assurance the Company will have adequate funds to complete the
purchase of all 20 switches or be able to utilize all of these switches in its
business.
 
     Dependence upon Network Infrastructure; Risk of System Failure; Security
Risks.  The Company's success in marketing its services to business and
residential users requires the Company to provide reliable service. The
Company's networks are subject to physical damage, power loss, capacity
limitations, software defects, breaches of security (by computer virus,
break-ins or otherwise) and other factors which may cause interruptions in
service or reduced capacity for the Company's customers. Interruptions in
service, capacity limitations or security breaches could have a material adverse
effect on customer acceptance and, therefore, on the Company's business,
financial condition and results of operations. Certain aspects of the Company's
network architecture involve new applications of equipment which may result in
technical issues that may not be easily resolved.
 
     Lack of New Service Acceptance by Customers.  The Company is entering new
markets which have historically been serviced by existing ILECs. The success of
the Company will be dependent upon, among other things, the willingness of
customers to accept the Company as an alternative provider of local and long
distance service. No assurance can be given that such acceptance will occur and
the lack of such acceptance could have a material adverse effect on the Company.
 
     Rapid Technological Changes.  The telecommunications industry is subject to
rapid and significant changes in technology. While the Company believes that for
the foreseeable future these changes will not materially affect or hinder the
Company's ability to acquire necessary technologies, the effect of technological
changes on the business of the Company cannot be predicted. Thus, there can be
no assurance technological developments will not have a material adverse effect
on the Company.
 
     Competition.  In its existing market and the markets into which it intends
to expand, the Company faces significant competition for its local telephone
services, including local exchange services, from ILECs, which currently
dominate their local telecommunications markets, and others. ILECs have
long-standing relationships with their customers which relationships may create
competitive barriers. Furthermore, ILECs may have the potential to subsidize
competitive service from monopoly service revenues. In addition, a continuing
 
                                       14
<PAGE>   20
 
trend toward business combinations and alliances in the telecommunications
industry may create significant new competitors to the Company. The Company also
faces and will face competition in the market in which it operates and in
markets into which it intends to expand from one or more CAP/CLECs operating
fiber optic networks. Many of the Company's existing and potential competitors
have financial, personnel and other resources significantly greater than those
of the Company.
 
     The Company believes various legislative initiatives, including the Act,
have removed remaining legislative barriers to local exchange competition.
Nevertheless, in light of the passage of the Act, regulators are also likely to
provide ILECs with increased pricing flexibility as competition increases. If
ILECs are permitted to lower their rates substantially or engage in excessive
volume or term discount pricing practices, the net income or cash flow of the
Company could be materially adversely affected.
 
     When the Company enters the long distance market, it will compete with
AT&T, MCI and others in the long distance services market. Additionally, recent
federal legislation permits the RBOCs to provide long distance services once
certain criteria are met. Once the RBOCs begin to provide such services, they
will be in a position to offer single source service similar to the service the
Company intends to offer. In addition, AT&T and MCI have entered, and other
interexchange carriers have announced their intent to enter, the local exchange
services market, which is facilitated by the Act's resale and unbundled network
element provisions. The Company cannot predict the number of competitors that
will emerge as a result of existing or new federal and state regulatory or
legislative actions. Competition from the RBOCs with respect to long distance
services or from AT&T, MCI or others with respect to local exchange services
could have a material adverse effect on the Company's business.
 
     Competitive Reaction.  Although the Company plans to offer rates for its
services which are below those currently charged by ILECs, ILECs or new
competitors with greater capital and resources than the Company may meet or
undercut the Company's price structure and prevent the Company from attaining
the share of the local telecommunications market necessary to achieve profitable
operations. The Company's ability to meet price competition may depend on its
ability to operate at costs equal to or lower than its competitors or potential
competitors. There is a risk that competitors, perceiving the Company to lack
capital resources, may undercut the Company's rates or increase their services
in an effort to force the Company out of business. In addition, the success of
the Company will ultimately depend on Management's ability to react
expeditiously and effectively to exigencies that have not been taken into
account in the Company's plan.
 
   
     Risks Regarding the Collateral.  Although the Notes will be secured by
certain Telecommunications Equipment, the value of the collateral will be
substantially less than the principal amount of the Notes. As of September 30,
1997, the Company has accepted delivery of approximately $7.1 million of
Telecommunications Equipment (other than Telecommunications Equipment located in
the Las Vegas area) and has purchase commitments for an additional $40.5 million
of Telecommunications Equipment (the majority of which will be located outside
of the Las Vegas area). In addition, the purchase price of the
Telecommunications Equipment may not represent the value that a secured party
would be able to receive upon enforcement of its security interest in such
Telecommunications Equipment. Furthermore, it is likely that the value of such
Telecommunications Equipment will decrease over time as such Telecommunications
Equipment is deployed in the business and equipment manufacturers develop
improved products or similar products at reduced prices. Liens on certain of the
Telecommunications Equipment will also be required to be released if such
Telecommunications Equipment is transferred to ILECs for nominal consideration
in connection with the establishment of virtual collocation arrangements with
such ILECs. The Company is not required to reduce the outstanding amount of the
Notes based on the value of the collateral. Therefore, it is likely that, if the
Notes were in default and the Trustee attempted to foreclose on the collateral,
the value of the collateral would be substantially less than the amount of the
indebtedness under the Notes.
    
 
     The security interest in Telecommunications Equipment to be acquired by the
Company will not arise until the Company actually acquires such
Telecommunications Equipment, which will be substantially after the issuance of
the Notes. As a result, the security interest arising in connection with the
later acquired Telecommunications Equipment may be subject to challenge, in a
bankruptcy or reorganization of the Company, as a preferential transfer insofar
as such security interest secures an antecedent debt. In such event,
 
                                       15
<PAGE>   21
 
if the Company became subject to a bankruptcy or similar proceeding during the
preference period (generally 90 days) following the acquisition of any
Telecommunications Equipment, the security interest in such Telecommunications
Equipment could be set aside in such proceeding for the benefit of other
creditors (if any) of the Company. See "Description of the Exchange Notes."
 
     Failure to Maintain Perfected Security Interest.  Under the Indenture, the
Company is required to secure the Notes by granting liens on certain
Telecommunications Equipment. The Company will file UCC-1 financing statements
naming the Company as debtor and the Trustee (as defined) as the secured party
acting as collateral agent for holders of Notes with the Secretary of State or
other appropriate office in each state in which the Company currently has (or
proposes to locate) Telecommunications Equipment. The Company has agreed to
maintain the effectiveness of such filings under the relevant provisions of the
Uniform Commercial Code. However, the liens will be perfected only to the extent
that such filings are sufficient to perfect liens on the Telecommunications
Equipment. Generally, filings will not be made in local filing offices, in real
estate records, with any federal office or agency or in respect of any
certificate of title. Failure to make additional filings or to maintain the
contemplated filings may allow other creditors of the Company, if any, to obtain
rights to the Telecommunications Equipment equal or superior to those of the
holders of the Notes. Owners or mortgagees of property on which items of
Telecommunications Equipment are installed may also obtain such rights. This
could result in all or some of the value of the Telecommunications Equipment
acquired by the Company not being available to the holders of the Notes to
satisfy the outstanding indebtedness of the Notes upon the occurrence of an
Event of Default (as defined). Such failure could arise, among other reasons,
because of the failure to file continuation statements prior to the expiration
of each five-year period after the initial filing or because of the failure to
make the additional filings discussed above. Accordingly, investors should not
rely on the perfection of any specific lien in making an investment decision to
tender Outstanding Notes in the Exchange Offer.
 
   
     Bankruptcy Risks Related to Escrow Account.  The right of the Trustee under
the Indenture and the Collateral Pledge Agreement (as defined) to foreclose upon
and sell Collateral (as defined) upon the occurrence of an Event of Default is
likely to be significantly impaired by applicable bankruptcy law if a bankruptcy
or reorganization case were to be commenced by or against the Company. Under
applicable bankruptcy law, secured creditors such as the holders of the Notes
are prohibited from foreclosing upon or disposing of a debtor's property without
prior bankruptcy court approval. See "Description of the Exchange Notes."
    
 
     Effective Subordination of the Notes.  The Indenture permits certain
Indebtedness of the Company to be secured. Holders of secured indebtedness of
the Company will have claims that are prior to the claims of the holders of the
Notes to the extent of the assets securing such other indebtedness. While the
Company currently has no subsidiaries, the Notes would be effectively
subordinated to the debt of any subsidiaries created in the future.
 
     Regulation.  The Company is subject to varying degrees of federal, state
and local regulation. The Company is not currently subject to price cap or rate
of return regulation, nor is it currently required to obtain FCC authorization
for the installation, acquisition or operation of its network facilities.
Further, the FCC has issued an order holding that non-dominant carriers, such as
the Company, are not required to file interstate tariffs for domestic long
distance service on an ongoing basis. That order was stayed by a federal appeals
court and the FCC recently has issued a further decision in the matter
addressing the court's concerns and providing for detariffing, subject to
further court review. The Company is or will be generally subject to
certification and tariff or price list filing requirements for intrastate
services by state regulators. Although passage of the Act should result in
increased opportunities for companies competing with the ILECs, no assurance can
be given changes in current or future regulations adopted by the FCC or state
regulators or other legislative or judicial initiatives relating to the
telecommunications industry would not have a material adverse effect on the
Company. Furthermore, while the Act reduces regulations to which non-dominant
local exchange carriers are subject, it also reduces the level of regulation
that applies to the ILECs and increases their ability to respond quickly to
competition from the Company and others. In addition, although the Act provides
incentives to ILECs to negotiate interconnection agreements with local
competitors, there can be no assurance these
 
                                       16
<PAGE>   22
 
ILECs will negotiate quickly with competitors such as the Company for the
required interconnection of the competitor's networks with those of the ILECs.
 
   
     On December 31, 1997, a federal judge in Dallas ruled key sections of the
Act unconstitutional on the grounds that RBOCs were unfairly denied access to
the long distance segment of the industry. This decision was immediately
appealed by numerous IXCs. There can be no assurance that these provisions of
the Act, which are favorable to the Company, will ultimately be determined to be
constitutional.
    
 
   
     It is anticipated the FCC will issue an order in 1998 that may permit
significant new pricing flexibility to ILECs. To the extent such increased
pricing flexibility is afforded to the ILECs, the ability of the Company to
compete with ILECs for certain services may be adversely affected. On May 8,
1997, the FCC issued an order establishing new Universal Service support funds.
The new Universal Service support fund rules will be administered jointly by the
FCC and state regulatory authorities, many of which rules are still in the
process of being formulated. The net revenue effect on the Company of these
rules is incalculable at this time.
    
 
     In certain locations, the Company may be required to obtain local
franchises, licenses or other operating rights and street opening and
construction permits to install its switches. In some of the areas where the
Company provides facilities based services, the Company may be required to pay
license or franchise fees based on a percentage of gross revenues or on a per
linear foot basis. There is no assurance certain cities that do not impose fees
will not seek to impose fees, nor is there any assurance, following the
expiration of existing franchises, fees will remain at their current levels.
 
   
     Forward Looking Statements.  The statements contained in this Prospectus
that are not historical facts are "forward-looking statements", which can be
identified by the use of forward-looking terminology such as "estimates,"
"projects," "anticipates," "expects," "intends," "believes," or the negative
thereof or other variations thereon or comparable terminology, or by discussions
of strategy that involve risks and uncertainties. Management wishes to caution
the reader these forward-looking statements (cautionary statements), such as the
Company's plans to expand its existing network or to commence service in new
areas, the market opportunity presented by the Company's target markets, the
Company's anticipation of installation of switches or the provision of local
exchange and long distance services, and statements regarding development of the
Company's businesses, the estimate of market sizes and addressable markets for
the Company's services and products, the Company's anticipated capital
expenditures, the effect of regulatory reform and other statements contained in
this Prospectus regarding matters that are not historical facts, are only
estimates or predictions. No assurance can be given future results will be
achieved; actual events or results may differ materially as a result of risks
facing the Company or actual results differing from the assumptions underlying
such statements. Such risks and assumptions include, but are not limited to, the
Company's ability to successfully market its services to current and new
customers, generate customer demand for its services in the particular markets
where it plans to market services, access markets, install switches and obtain
suitable locations for its switches, negotiate suitable interconnect agreements
with the ILECs, all in a timely manner, at reasonable costs and on satisfactory
terms and conditions, as well as regulatory, legislative and judicial
developments that could cause actual results to vary materially from the future
results indicated, expressed or implied in such forward-looking statements. All
written and oral forward-looking statements made in connection with this
Prospectus which are attributable to the Company or persons acting on its behalf
are expressly qualified in their entirety by these cautionary statements. The
safe harbor for forward-looking statements provided in the Private Securities
Litigation Reform Act of 1995 does not apply to initial public offerings.
    
 
     Absence of a Public Market for the Notes.  The Exchange Notes are new
issues of securities for which there is currently no public market. The Company
does not intend to apply for listing of the Exchange Notes on any securities
exchange or on the Nasdaq National Market. Although the Initial Purchasers have
informed the Company they currently intend to make a market in the Notes, they
are not obligated to do so and any such market-making may be discontinued at any
time without notice. Accordingly, there can be no assurance as to the
development or liquidity of any market for the Notes. If a market for the Notes
were to develop, the Notes may trade at prices that may be higher or lower than
their initial offering price depending upon many factors, including prevailing
interest rates, the Company's operating results and the markets for similar
securities. Historically, the market for securities such as those offered hereby
has been subject to disruptions that have caused substantial volatility in the
prices of similar securities. There can be no assurance, if a market
 
                                       17
<PAGE>   23
 
for the Notes were to develop, such a market would not be subject to similar
disruptions. Any such disruptions may have an adverse effect on the holders of
the Notes.
 
     Consequences of Failure to Exchange; Possible Adverse Effect on Trading
Market for Outstanding Notes. Holders of Outstanding Notes who do not exchange
their Outstanding Notes for Exchange Notes pursuant to the Exchange Offer will
continue to be subject to the restrictions on transfer of such Notes as set
forth in the legend thereon as a consequence of the issuance of the Outstanding
Notes pursuant to exemptions from, or in transactions not subject to, the
registration requirements of the Securities Act and applicable state securities
laws. In general, the Outstanding Notes may not be offered or sold unless
registered under the Securities Act and applicable state laws, or pursuant to an
exemption therefrom. Subject to the obligation by the Company to file a Shelf
Registration Statement covering resales of Outstanding Notes in certain
circumstances, the Company does not intend to register the Outstanding Notes
under the Securities Act and, after consummation of the Exchange Offer, will not
be obligated to do so. In addition, any holders of Outstanding Notes who tender
in the Exchange Offer for the purpose of participating in a distribution of the
Exchange Notes may be deemed to have received restricted securities and, if so,
will be required to comply with the registration and prospectus delivery
requirements of the Securities Act in connection with any resale transaction.
Additionally, as a result of the Exchange Offer, it is expected that a
substantial decrease in the aggregate principal amount of Outstanding Notes
outstanding will occur. As a result, it is unlikely that a liquid trading market
will exist for the Outstanding Notes at any time. This lack of liquidity will
make transactions more difficult and may reduce the trading price of the
Outstanding Notes. See "The Exchange Offer" and "Description of the Exchange
Notes -- Registration Rights; Liquidated Damages."
 
                                USE OF PROCEEDS
 
     This Exchange Offer is intended to satisfy certain obligations of the
Company under the Registration Rights Agreement. The Company will not receive
any proceeds from the issuance of the Exchange Notes offered hereby. In
consideration for issuing the Exchange Notes as contemplated in this Prospectus,
the Company will receive, in exchange, Outstanding Notes in like principal
amount. The form and terms of the Exchange Notes are identical in all material
respects to the form and terms of the Outstanding Notes, except as otherwise
described herein under "The Exchange Offer -- Terms of the Exchange Offer." The
Outstanding Notes surrendered in exchange for the Exchange Notes will be retired
and canceled and cannot be reissued. Accordingly, issuance of the Exchange Notes
will not result in any increase in the outstanding debt of the Company.
 
   
     The net proceeds from the issuance of the Outstanding Notes and the
Preferred Stock Offering, after underwriting discounts, commissions and
expenses, were approximately $171.1 million. At the Closing of the issuance of
the Notes, the Company used approximately $56.8 million of the net proceeds to
purchase U.S. Government Securities, in an amount sufficient to pay the first
six interest payments on the Notes, which U.S. Government Securities are pledged
as security for the payment of the principal of and interest on the Notes.
Approximately $100.0 million of the net proceeds of the issuance of the Notes
are expected to be used to fund the cost of acquiring and installing
telecommunications switches and related equipment. The balance of the net
proceeds from the issuance of the Notes and the proceeds of the Preferred Stock
Offering will be used for working capital and general corporate purposes,
including to fund operating losses, the cost of purchasing and improving
facilities to house the Company's telecommunications and related equipment, and
the cost of tenant improvements in facilities which the Company leases to house
its telecommunications and related equipment. See "Description of the Exchange
Notes -- Certain Covenants -- Use of Proceeds."
    
 
   
     Prior to the application of the net proceeds of the issuance of the Notes
and the Preferred Stock Offering, as described above, such funds will be
invested in short-term investment grade securities.
    
 
                                       18
<PAGE>   24
 
                                 CAPITALIZATION
 
   
     The following table shows the Total capitalization, Cash and cash
equivalents and Restricted investments of the Company as of September 30, 1997
and as adjusted to give effect to the receipt of the net proceeds of the
Preferred Stock Offering. This table should be read in conjunction with the
financial statements and related notes appearing elsewhere herein.
    
 
   
<TABLE>
<CAPTION>
                                                                 AS OF SEPTEMBER 30, 1997
                                                                --------------------------
                                                                 ACTUAL     AS ADJUSTED(1)
                                                                --------    --------------
                                                                  (DOLLARS IN THOUSANDS)
<S>                                                             <C>         <C>
Cash and cash equivalents (excluding restricted
  investments)..............................................    $ 95,390       $112,042
Restricted investments(2)...................................      56,767         56,767
                                                                --------       --------
  Total cash and restricted investments.....................    $152,157       $168,809
                                                                ========       ========
 
13% Senior Secured Notes due 2004(3)........................    $155,974       $155,974
Other long-term debt, including current maturities..........         615            615
Redeemable Series A Convertible Preferred Stock(1)..........          --         16,652
                                                                --------       --------
 
Stockholders' equity
  Common Stock -- par value.................................          15             15
  Common Stock -- Additional paid in capital................      22,111         22,111
  Notes receivable from stockholders for issuance of Common
     Stock..................................................        (688)          (688)
  Accumulated deficit.......................................      (6,630)        (6,630)
                                                                --------       --------
     Total stockholders' equity.............................      14,808         14,808
                                                                --------       --------
 
          Total capitalization..............................    $171,397       $188,049
                                                                ========       ========
</TABLE>
    
 
- ---------------
   
(1) Gives effect to the issuance in November 1997 of 5,148,570 shares of Series
    A Convertible Preferred Stock (the "Preferred Stock") resulting in net
    proceeds to the Company of approximately $16,652,000 (the "Preferred Stock
    Offering"). Commencing at any time on or after October 2, 2004, at the
    option and written election of the holders of a majority of the outstanding
    shares of the Preferred Stock, the Company shall, subject to applicable law,
    redeem all of the outstanding shares of Preferred Stock at the price equal
    to the greater of: (i) $3.50, plus an amount equal to any unpaid dividends
    thereon, or (ii) the market value of the Preferred Stock, on an as converted
    basis, determined by an independent appraiser. Dividends on the Preferred
    Stock accumulate whether or not the Company has earnings or profits, whether
    or not there are funds available for the payment of dividends and whether or
    not dividends are declared.
    
 
   
(2) A portion of the proceeds of the sale of the Notes has been used to purchase
    Government Securities representing funds sufficient to provide for payment
    in full of the first six interest payments on the Notes and which will be
    pledged as security for repayment of the principal of and interest on the
    Notes. See "Description of the Exchange Notes--Security."
    
 
   
(3) A portion of the proceeds of the sale of the Notes (approximately
    $4,026,000) has been allocated to Common Stock -- Additional paid in capital
    to reflect the value of warrants issued to the purchasers of the Notes.
    
 
                                       19
<PAGE>   25
 
                               THE EXCHANGE OFFER
 
PURPOSE AND EFFECT OF THE EXCHANGE OFFER
 
     The Outstanding Notes were sold by the Company on September 29, 1997 to the
Initial Purchasers, who sold the Outstanding Notes to certain institutional
investors in reliance on Rule 144A and Regulation D promulgated by the
Commission under the Securities Act and certain foreign investors in reliance on
Regulation S promulgated by the Commission under the Securities Act. In
connection with the sale of the Outstanding Notes, the Company and the Initial
Purchasers entered into the Registration Rights Agreement, pursuant to which the
Company agreed (i) to file a registration statement with respect to an offer to
exchange the Outstanding Notes for senior secured debt securities of the Company
with terms substantially identical to the Outstanding Notes (except that the
Exchange Notes will not contain terms with respect to transfer restrictions)
within 30 days after the date of original issuance of the Outstanding Notes and
(ii) to use best efforts to cause such registration statement to become
effective under the Securities Act within 120 days after such issue date. If
applicable law or the positions taken by the staff of the Commission that have
been enunciated in the no-action letters issued in Exxon Capital Holdings Corp.
(available April 13, 1989) and Morgan Stanley & Co. Inc. (available June 5,
1991), among others, do not permit the Company to cause the registration
statement containing this Prospectus to become effective or to effect the
Exchange Offer, or under certain other circumstances, the Company will use its
best efforts to cause to become effective the Shelf Registration Statement with
respect to the resale of the Outstanding Notes and to keep the Shelf
Registration Statement effective until 365 days after the effective date
thereof. The Company is obligated to pay certain liquidated damages under
certain circumstances if the Company is not in compliance with its obligations
under the Registration Rights Agreement. See "Description of the Exchange
Notes -- Registration Rights; Liquidated Damages." Unless the context requires
otherwise, the term "holder" with respect to the Exchange Offer means the
registered holder of the Outstanding Notes or any other person who has obtained
a properly completed bond power from the registered holder.
 
   
     Each holder of the Outstanding Notes who wishes to exchange such
Outstanding Notes for Exchange Notes in the Exchange Offer will be required to
make certain representations, including representations that (i) the Outstanding
Notes tendered were, and any Exchange Notes to be received by it will be,
acquired in the ordinary course of its business, (ii) at the time of the
commencement of the Exchange Offer, it had no arrangement with any person to
participate in the distribution of the Exchange Notes, (iii) it is not engaged
in nor does it intend to engage in a distribution of the Exchange Notes, and
(iv) it is not an "affiliate," as defined in Rule 405 of the Securities Act, of
the Company or, if it is an affiliate, it will comply with the registration and
prospectus delivery requirements of the Securities Act to the extent applicable.
See "Description of the Exchange Notes -- Registration Rights; Liquidated
Damages." Holders who tender Outstanding Notes in the Exchange Offer with the
intention to participate in a distribution of the Exchange Notes may not rely
upon the Morgan Stanley or similar no-action letters.
    
 
RESALE OF EXCHANGE NOTES
 
   
     Based on positions taken by the staff of the Commission set forth in
no-action letters issued to third parties, the Company believes that, except as
described below, Exchange Notes issued pursuant to the Exchange Offer in
exchange for Outstanding Notes may be offered for resale, resold and otherwise
transferred by any holder thereof (other than a holder which is an "affiliate"
of the Company within the meaning of Rule 405 under the Securities Act or a
broker dealer who acquired Outstanding Notes from the Company to resell pursuant
to Rule 144 or any other available exemption under the Securities Act) without
compliance with the registration and prospectus delivery requirements of the
Securities Act, provided that such Exchange Notes are acquired in the ordinary
course of such holder's business and such holder does not intend to participate
and has no arrangement or understanding with any person to participate in the
distribution of such Exchange Notes. Any holder who tenders in the Exchange
Offer with the intention or for the purpose of participating in a distribution
of the Exchange Notes cannot rely on such positions taken by the staff of the
Commission and must comply with the registration and prospectus delivery
requirements of the Securities Act in connection with a secondary resale
transaction. Unless an exemption from registration is otherwise available, any
such resale transaction should be covered by an effective registration statement
containing the selling security holders information required by Item 507 of
Regulation S-K under the Securities Act.
    
 
                                       20
<PAGE>   26
 
     This Prospectus may be used for an offer to resell, resale or other
retransfer of Exchange Notes only as specifically set forth herein. Each
broker-dealer that receives Exchange Notes for its own account in exchange for
Outstanding Notes, where such Outstanding Notes were acquired by such
broker-dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such Exchange Notes. See "Plan of Distribution."
 
TERMS OF THE EXCHANGE OFFER
 
     Upon the terms and subject to the conditions set forth in this Prospectus
and in the Letter of Transmittal, the Company will accept for exchange any and
all Outstanding Notes properly tendered and not withdrawn prior to 5:00 p.m.,
New York time, on the Expiration Date. The Company will issue $1,000 principal
amount of Exchange Notes in exchange for each $1,000 principal amount of
Outstanding Notes surrendered pursuant to the Exchange Offer. Outstanding Notes
may be tendered only in integral multiples of $1,000.
 
     The form and terms of the Exchange Notes will be the same as the form and
terms of the Outstanding Notes, except that the Exchange Notes will be
registered under the Securities Act and hence will not bear legends restricting
the transfer thereof. The Exchange Notes will evidence the same debt as the
Outstanding Notes. The Exchange Notes will be issued under and entitled to the
benefits of the Indenture, which also authorized the issuance of the Outstanding
Notes, such that both series will be treated as a single class of debt
securities under the Indenture.
 
     The Exchange Offer is not conditioned upon any minimum aggregate principal
amount of Outstanding Notes being tendered for exchange. Holders of Outstanding
Notes do not have any appraisal or dissenters' rights in connection with the
Exchange Offer.
 
     As of the date of this Prospectus, $160,000,000 aggregate principal amount
of the Outstanding Notes are outstanding. This Prospectus, together with the
Letter of Transmittal, is being sent to all registered holders of Outstanding
Notes. There will be no fixed record date for determining registered holders of
Outstanding Notes entitled to participate in the Exchange Offer.
 
     The Company intends to conduct the Exchange Offer in accordance with the
provisions of the Registration Rights Agreement and the applicable requirements
of the Exchange Act, and the rules and regulations of the Commission thereunder.
Outstanding Notes which are not tendered for exchange in the Exchange Offer will
remain outstanding and continue to accrue interest and will be entitled to the
rights and benefits such holders have under the Indenture and the Registration
Rights Agreement.
 
     The Company shall be deemed to have accepted for exchange properly tendered
Notes when, as and if the Company shall have given oral or written notice
thereof to the Exchange Agent and complied with the applicable provisions of the
Registration Rights Agreement. The Exchange Agent will act as agent for the
tendering holders for the purposes of receiving the Exchange Notes from the
Company. The Company expressly reserves the right to amend or terminate the
Exchange Offer, and not to accept for exchange any Outstanding Notes not
theretofore accepted for exchange, upon the occurrence of any of the conditions
specified below under "-- Certain Conditions to the Exchange Offer."
 
     Holders who tender Outstanding Notes in the Exchange Offer will not be
required to pay brokerage commissions or fees or, subject to the instructions in
the Letter of Transmittal, transfer taxes with respect to the exchange of
Outstanding Notes pursuant to the Exchange Offer. The Company will pay all
charges and expenses, other than certain applicable taxes described below, in
connection with the Exchange Offer. See "The Exchange Offer -- Fees and
Expenses."
 
EXPIRATION DATE; EXTENSIONS; AMENDMENTS
 
     The term "Expiration Date" shall mean 5:00 p.m., New York time on
            , 1998, unless the Company, in its sole discretion, extends the
Exchange Offer, in which case the term "Expiration Date" shall mean the latest
date and time to which the Exchange Offer is extended. The Exchange Offer will
not in any event be extended beyond             , 1998.
 
                                       21
<PAGE>   27
 
     In order to extend the Exchange Offer, the Company will notify the Exchange
Agent of any extension by oral or written notice and will mail to the registered
holders of Outstanding Notes an announcement thereof, each prior to 9:00 a.m.,
New York time, on the next business day after the then Expiration Date.
 
     The Company reserves the right, in its sole discretion, (i) to delay
accepting for exchange any Notes, to extend the Exchange Offer or to terminate
the Exchange Offer if any of the conditions set forth below under "-- Certain
Conditions to the Exchange Offer" shall not have been satisfied, by giving oral
or written notice of such delay, extension or termination to the Exchange Agent
or (ii) to amend the terms of the Exchange Offer in any manner. Any such delay
in acceptance, extension, termination or amendment will be followed as promptly
as practicable by oral or written notice thereof to the registered holders of
Outstanding Notes. If the Exchange Offer is amended in a manner determined by
the Company to constitute a material change, the Company will promptly disclose
such amendment by means of a prospectus supplement that will be distributed to
the registered holders, and the Company will extend the Exchange Offer,
depending upon the significance of the amendment and the manner of disclosure to
the registered holders, if the Exchange Offer would otherwise expire during such
period.
 
INTEREST ON THE EXCHANGE NOTES
 
     The Exchange Notes will bear interest at a rate of 13% per annum, payable
semi-annually, on each April 1 and October 1, commencing April 1, 1998. Holders
of Exchange Notes will receive interest on April 1, 1998 from the later of the
date of initial issuance of the Outstanding Notes, or the most recent date as of
which interest has been paid on the Outstanding Notes. All obligations under the
Outstanding Notes accepted for exchange will cease to exist upon issuance of the
Exchange Notes.
 
CERTAIN CONDITIONS TO THE EXCHANGE OFFER
 
     Notwithstanding any other term of the Exchange Offer, the Company will not
be required to accept for exchange, or exchange any Exchange Notes for, any
Outstanding Notes, and may terminate the Exchange Offer as provided herein
before the acceptance of any Outstanding Notes for exchange, if:
 
          (a) any action or proceeding is instituted or threatened in any court
     or by or before any governmental agency with respect to the Exchange Offer
     which, in the Company's reasonable judgment, might materially impair the
     ability of the Company to proceed with the Exchange Offer; or
 
          (b) any law, statute, rule or regulation is proposed, adopted or
     enacted, or any existing law, statute, rule or regulation is interpreted by
     the staff of the Commission, which, in the Company's reasonable judgment,
     might materially impair the ability of the Company to proceed with the
     Exchange Offer; or
 
          (c) any governmental approval has not been obtained, which approval
     the Company shall reasonably deem necessary for the consummation of the
     Exchange Offer as contemplated hereby.
 
     The Company expressly reserves the right to amend or terminate the Exchange
Offer, and not to accept for exchange any Outstanding Notes not theretofore
accepted for exchange, upon the occurrence of any of the conditions of the
Exchange Offer specified above. The Company will give oral or written notice of
any extension, amendment, non-acceptance or termination to the holders of the
Outstanding Notes as promptly as practicable, such notice in the case of any
extension to be issued no later than 9:00 a.m., New York time, on the next
business day after the previously scheduled Expiration Date.
 
     The foregoing conditions are for the sole benefit of the Company and may be
asserted by the Company regardless of the circumstances giving rise to any such
condition or may be waived by the Company in whole or in part at any time and
from time to time in its reasonable judgment. The failure by the Company at any
time to exercise any of the foregoing rights shall not be deemed a waiver of any
such right, and each such right shall be deemed an ongoing right which may be
asserted at any time and from time to time.
 
     In addition, the Company will not accept for exchange any Outstanding Notes
tendered, and no Exchange Notes will be issued in exchange for any such
Outstanding Notes, if at such time any stop order
 
                                       22
<PAGE>   28
 
shall be threatened or in effect with respect to the Registration Statement of
which this Prospectus constitutes a part or the qualification of the Indenture
under the Trust Indenture Act of 1939.
 
PROCEDURES FOR TENDERING
 
     Only a holder of Outstanding Notes may tender such Outstanding Notes in the
Exchange Offer. To tender in the Exchange Offer, a holder must either: (i)
complete, sign and date the Letter of Transmittal, or facsimile thereof, have
the signature thereon guaranteed if required by the Letter of Transmittal, and
mail or otherwise deliver such Letter of Transmittal or such facsimile to the
Exchange Agent, or (ii) if such Outstanding Notes are tendered pursuant to the
procedures for book-entry transfer set forth below, a holder tendering
Outstanding Notes may transmit an Agent's Message (defined herein) to the
Exchange Agent in lieu of the Letter of Transmittal, in either case on or prior
to the Expiration Date. In addition, either (i) Outstanding Notes must be
received by the Exchange Agent along with the Letter of Transmittal, or (ii) a
timely confirmation of book-entry transfer (a "Book-Entry Confirmation") of such
Outstanding Notes, if such procedure is available, into the Exchange Agent's
account at the Depository Trust Company (the "Book-Entry Transfer Facility")
pursuant to the procedure for book-entry transfer described below, along with
the Letter of Transmittal or an Agent's Message, as the case may be, must be
received by the Exchange Agent prior to the Expiration Date, or (iii) the holder
must comply with the guaranteed delivery procedures described below. The term
"Agent's Message" means a message, transmitted to the Book-Entry Transfer
Facility and received by the Exchange Agent and forming a part of the Book-Entry
Confirmation, which states that the Book-Entry Transfer Facility has received an
express acknowledgment from the tendering participant in the Book-Entry Transfer
Facility that such participant has received and agrees to be bound by the Letter
of Transmittal and that the Company may enforce the Letter of Transmittal
against such participant. To be tendered effectively, the Letter of Transmittal
and other required documents or, in the case of a Book-Entry Confirmation, an
Agent's Message in lieu thereof, must be received by the Exchange Agent at the
address set forth below under "The Exchange Offer -- Exchange Agent" prior to
5:00 p.m., New York time, on the Expiration Date.
 
     The tender by a holder which is not withdrawn prior to the Expiration Date
will constitute an agreement between such holder and the Company in accordance
with the terms and subject to the conditions set forth herein and in the Letter
of Transmittal.
 
     THE METHOD OF DELIVERY OF OUTSTANDING NOTES, THE LETTER OF TRANSMITTAL AND
ALL OTHER REQUIRED DOCUMENTS TO THE EXCHANGE AGENT IS AT THE ELECTION AND RISK
OF THE HOLDER. INSTEAD OF DELIVERY BY MAIL, IT IS RECOMMENDED THAT HOLDERS USE
AN OVERNIGHT OR HAND DELIVERY SERVICE. IN ALL CASES, SUFFICIENT TIME SHOULD BE
ALLOWED TO ASSURE DELIVERY TO THE EXCHANGE AGENT BEFORE THE EXPIRATION DATE. NO
LETTER OF TRANSMITTAL OR OUTSTANDING NOTES SHOULD BE SENT TO THE COMPANY.
HOLDERS MAY REQUEST THEIR RESPECTIVE BROKERS, DEALERS, COMMERCIAL BANKS, TRUST
COMPANIES OR OTHER NOMINEES TO EFFECT THE ABOVE TRANSACTIONS FOR SUCH HOLDERS.
 
     Any beneficial owner whose Outstanding Notes are registered in the name of
a broker, dealer, commercial bank, trust company or other nominee and who wishes
to tender should contact the registered holder promptly and instruct such
registered holder of Outstanding Notes to tender on such beneficial owner's
behalf. If such beneficial owner wishes to tender on such owner's own behalf,
such owner must, prior to completing and executing the Letter of Transmittal and
delivering such owner's Outstanding Notes, either make appropriate arrangements
to register ownership of the Outstanding Notes in such owner's name or obtain a
properly completed bond power from the registered holder of Outstanding Notes.
The transfer of registered ownership may take considerable time and may not be
able to be completed prior to the Expiration Date.
 
     Signatures on a Letter of Transmittal or a notice of withdrawal described
below, as the case may be, must be guaranteed by an Eligible Institution (as
defined below) unless the Outstanding Notes tendered pursuant thereto are
tendered (i) by a registered holder who has not completed the box entitled
"Special Issuance Instructions" or "Special Delivery Instructions" on the Letter
of Transmittal or (ii) for the account of an Eligible Institution. If signatures
on a Letter of Transmittal or a notice of withdrawal, as the case may be, are
 
                                       23
<PAGE>   29
 
required to be guaranteed, such guarantor must be a member firm of a registered
national securities exchange or of the National Association of Securities
Dealers, Inc., a commercial bank or trust company having an office or
correspondent in the United States or an "eligible guarantor institution" within
the meaning of Rule 17Ad-15 under the Exchange Act which is a member of one of
the recognized signature guarantee programs identified in the Letter of
Transmittal (an "Eligible Institution").
 
     If the Letter of Transmittal is signed by a person other than the
registered holder of any Outstanding Notes listed therein, such Outstanding
Notes must be endorsed or accompanied by a properly completed bond power, signed
by such registered holder as such registered holder's name appears on such
Outstanding Notes with the signature thereon guaranteed by an Eligible
Institution.
 
     If the Letter of Transmittal or any Outstanding Notes or bond powers are
signed by trustees, executors, administrators, guardians, attorneys-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity, such persons should so indicate when signing, and unless waived by the
Company, evidence satisfactory to the Company of their authority to so act must
be submitted with the Letter of Transmittal.
 
     All questions as to the validity, form, eligibility (including time of
receipt), acceptance of tendered Outstanding Notes and withdrawal of tendered
Outstanding Notes will be determined by the Company in its sole discretion,
which determination will be final and binding. The Company reserves the absolute
right to reject any and all Outstanding Notes not properly tendered or any
Outstanding Notes the Company's acceptance of which would, in the opinion of
counsel for the Company, be unlawful. The Company also reserves the right to
waive any defects, irregularities or conditions of tender as to particular
Outstanding Notes. The Company's interpretation of the terms and conditions of
the Exchange Offer (including the instructions in the Letter of Transmittal)
will be final and binding on all parties. Unless waived, any defects or
irregularities in connection with tenders of Outstanding Notes must be cured
within such time as the Company shall determine. Although the Company intends to
notify holders of defects or irregularities with respect to tenders of
Outstanding Notes, neither the Company, the Exchange Agent nor any other person
shall incur any liability for failure to give such notification. Tenders of
Outstanding Notes will not be deemed to have been made until such defects or
irregularities have been cured or waived. Any Outstanding Notes received by the
Exchange Agent that are not properly tendered and as to which the defects or
irregularities have not been cured or waived will be returned by the Exchange
Agent to the tendering holders, unless otherwise provided in the Letter of
Transmittal, as soon as practicable following the Expiration Date.
 
     In all cases, issuance of Exchange Notes for Outstanding Notes that are
accepted for exchange pursuant to the Exchange Offer will be made only after
timely receipt by the Exchange Agent of Outstanding Notes or a timely Book-Entry
Confirmation of such Outstanding Notes into the Exchange Agent's account at the
Book-Entry Transfer Facility, a properly completed and duly executed Letter of
Transmittal and all other required documents, or, in the case of a Book-Entry
Confirmation, an Agent's Message in lieu thereof. If any tendered Outstanding
Notes are not accepted for exchange for any reason set forth in the terms and
conditions of the Exchange Offer or if Outstanding Notes are submitted for a
greater principal amount than the holder desires to exchange, such unaccepted or
non-exchanged Outstanding Notes will be returned without expense to the
tendering holder thereof (or, in the case of Outstanding Notes tendered by
book-entry transfer into the Exchange Agent's account at the Book-Entry Transfer
Facility pursuant to the book-entry transfer procedures described below, such
non-exchanged Notes will be credited to an account maintained with such
Book-Entry Transfer Facility) as promptly as practicable after the expiration or
termination of the Exchange Offer.
 
BOOK-ENTRY TRANSFER
 
     The Exchange Agent will make a request to establish an account with respect
to the Outstanding Notes at the Book-Entry Transfer Facility for purposes of the
Exchange Offer within two business days after the date of this Prospectus, and
any financial institution that is a participant in the Book-Entry Transfer
Facility's system may make book-entry delivery of Outstanding Notes by causing
the Book-Entry Transfer Facility to transfer such Outstanding Notes into the
Exchange Agent's account at the Book-Entry Transfer Facility in accordance with
such Book-Entry Transfer Facility's procedures for transfer. However, although
delivery of
 
                                       24
<PAGE>   30
 
Notes may be effected through book-entry transfer at the Book-Entry Transfer
Facility, the Letter of Transmittal or facsimile thereof, with any required
signature guarantees, or an Agent's Message in lieu of a Letter of Transmittal,
and any other required documents, must, in any case, be transmitted to and
received by the Exchange Agent at the address set forth below under "The
Exchange Offer -- Exchange Agent" on or prior to the Expiration Date or, if the
guaranteed delivery procedures described below are to be complied with, within
the time period provided under such procedures. Delivery of documents to the
Book-Entry Transfer Facility does not constitute delivery to the Exchange Agent.
 
GUARANTEED DELIVERY PROCEDURES
 
     Holders who wish to tender their Outstanding Notes and (i) whose
Outstanding Notes are not immediately available or (ii) who cannot deliver their
Outstanding Notes, the Letter of Transmittal or any other required documents to
the Exchange Agent prior to the Expiration Date, may effect a tender if:
 
          (a) The tender is made through an Eligible Institution;
 
          (b) Prior to the Expiration Date, the Exchange Agent receives from
     such Eligible Institution a properly completed and duly executed Notice of
     Guaranteed Delivery (by facsimile transmission, mail or hand delivery)
     setting forth the name and address of the holder, the registered number(s)
     of such Outstanding Notes and the principal amount of Outstanding Notes
     tendered, stating that the tender is being made thereby and guaranteeing
     that, within three (3) New York Stock Exchange trading days after the
     Expiration Date, the Letter of Transmittal (or facsimile thereof) together
     with the Outstanding Notes or a Book-Entry Confirmation, as the case may
     be, and any other documents required by the Letter of Transmittal will be
     deposited by the Eligible Institution with the Exchange Agent; and
 
          (c) Such properly completed and executed Letter of Transmittal (or
     facsimile thereof), as well as all tendered Notes in proper form for
     transfer or a Book-Entry Confirmation, as the case may be, and all other
     documents required by the Letter of Transmittal, are received by the
     Exchange Agent within three (3) New York Stock Exchange trading days after
     the Expiration Date.
 
     Upon request to the Exchange Agent, a Notice of Guaranteed Delivery will be
sent to holders who wish to tender their Outstanding Notes according to the
guaranteed delivery procedures set forth above.
 
WITHDRAWAL OF TENDERS
 
     Except as otherwise provided herein, tenders of Outstanding Notes may be
withdrawn at any time prior to 5:00 p.m., New York time, on the Expiration Date.
 
     For a withdrawal to be effective, a written notice of withdrawal must be
received by the Exchange Agent at the address set forth below under "Exchange
Agent." Any such notice of withdrawal must specify the name of the person having
tendered the Outstanding Notes to be withdrawn, identify the Outstanding Notes
to be withdrawn (including the principal amount of such Outstanding Notes), and
(where certificates for Outstanding Notes have been transmitted) specify the
name in which such Outstanding Notes were registered, if different from that of
the withdrawing holder. If certificates for Outstanding Notes have been
delivered or otherwise identified to the Exchange Agent, then, prior to the
release of such certificates, the withdrawing holder must also submit the serial
numbers of the particular certificates to be withdrawn and a signed notice of
withdrawal with signatures guaranteed by an Eligible Institution unless such
holder is an Eligible Institution. If Outstanding Notes have been tendered
pursuant to the procedure for book-entry transfer described above, any notice of
withdrawal must specify the name and number of the account at the Book-Entry
Transfer Facility to be credited with the withdrawn Outstanding Notes and
otherwise comply with the procedures of such facility. All questions as to the
validity, form and eligibility (including time of receipt) of such notices will
be determined by the Company, whose determination shall be final and binding on
all parties. Any Outstanding Notes so withdrawn will be deemed not to have been
validly tendered for exchange for purposes of the Exchange Offer. Any
Outstanding Notes which have been tendered for exchange but which are not
exchanged for any reason will be returned to the holder thereof without cost to
such holder (or, in the case of Outstanding Notes tendered by book-entry
transfer into the Exchange Agent's account at the Book-Entry Transfer Facility
pursuant to the book-entry transfer procedures described above, such Outstanding
Notes will be credited to an account maintained with such Book-Entry Transfer
Facility for the Outstanding Notes) as soon as practicable after withdrawal,
rejection of tender or termination of the
 
                                       25
<PAGE>   31
 
Exchange Offer. Properly withdrawn Outstanding Notes may be retendered by
following one of the procedures described under "-- Procedures for Tendering"
above at any time on or prior to the Expiration Date.
 
EXCHANGE AGENT
 
     Marine Midland Bank has been appointed as Exchange Agent of the Exchange
Offer. Questions and requests for assistance, requests for additional copies of
this Prospectus or of the Letter of Transmittal and requests for Notice of
Guaranteed Delivery should be directed to the Exchange Agent addressed as
follows:
 
                              Marine Midland Bank
                                  140 Broadway
                         New York, New York 10005-1180
                        Attn: Corporate Trust Operations
                                 By Facsimile:
                                 (212) 658-6425
                        (For Eligible Institutions Only)
                      Confirm by Telephone: (212) 658-6433
 
FEES AND EXPENSES
 
     The expenses of soliciting tenders will be borne by the Company. The
principal solicitation is being made by mail; however, additional solicitation
may be made by telegraph, telephone or in person by officers and regular
employees of the Company and its affiliates.
 
     The Company has not retained any dealer-manager in connection with the
Exchange Offer and will not make any payments to broker-dealers or others
soliciting acceptances of the Exchange Offer. The Company, however, will pay the
Exchange Agent reasonable and customary fees for its services and will reimburse
it for its reasonable out-of-pocket expenses in connection therewith.
 
   
     The cash expenses to be incurred in connection with the Exchange Offer will
be paid by the Company and are estimated in the aggregate to be approximately
$110,000. Such expenses include registration fees, fees and expenses of the
Exchange Agent and Trustee, accounting and legal fees, printing costs and
related fees and expenses.
    
 
TRANSFER TAXES
 
     The Company will pay all transfer taxes, if any, applicable to the exchange
of Notes pursuant to the Exchange Offer. If, however, certificates representing
Outstanding Notes for principal amounts not tendered or accepted for exchange
are to be delivered to, or are to be issued in the name of, any person other
than the registered holder of Notes tendered, or if tendered Notes are
registered in the name of any person other than the person signing the Letter of
Transmittal, or if a transfer tax is imposed for any reason other than the
exchange of Notes pursuant to the Exchange Offer, then the amount of any such
transfer taxes (whether imposed on the registered holder or any other persons)
will be payable by the tendering holder. If satisfactory evidence of payment of
such taxes or exemption therefrom is not submitted with the Letter of
Transmittal, the amount of such transfer taxes will be billed directly to such
tendering holder.
 
CONSEQUENCES OF FAILURE TO EXCHANGE
 
     Holders of Outstanding Notes who do not exchange their Outstanding Notes
for Exchange Notes pursuant to the Exchange Offer will continue to be subject to
the restrictions on transfer of such Outstanding Notes, as set forth in the
legend thereon, as a consequence of the issuance of the Outstanding Notes
pursuant to the exemptions from, or in transactions not subject to, the
registration requirements of the Securities Act and applicable state securities
laws. In general, the Outstanding Notes may not be offered or sold, unless
registered under the Securities Act, except pursuant to an exemption from, or in
a transaction not subject to, the Securities Act and applicable state securities
laws. The Company does not currently anticipate that it will register the
Outstanding Notes under the Securities Act.
 
                                       26
<PAGE>   32
 
                       SELECTED HISTORICAL FINANCIAL DATA
 
   
     The following selected financial data of the Company as of and for the year
ended December 31, 1996, under the captions "Statement of Operations Data,"
"Other Financial Data" and " Balance Sheet Data" are derived from the financial
statements of the Company which financial statements have been audited by KPMG
Peat Marwick LLP, independent certified public accountants. The financial
statements as of and for the year ended December 31, 1996 are included elsewhere
in this Prospectus. The following selected financial data of the Company as of
and for the nine months ended September 30, 1997 and 1996, under the captions
"Statement of Operations Data," "Balance Sheet Data" and "Other Financial Data"
are derived from the unaudited financial statements of the Company included
elsewhere in this Prospectus. The unaudited financial statements include all
adjustments, consisting of normal recurring accruals, which the Company
considers necessary for a fair presentation of the financial position and the
results of operations for these periods. Operating results for the nine months
ended September 30, 1997 and 1996 are not necessarily indicative of the results
that may be expected for the entire year. The information presented below under
the caption "Operating Data" is unaudited. The data should be read in
conjunction with the financial statements, related notes and other financial
information included elsewhere in this Prospectus as well as "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
    
 
   
<TABLE>
<CAPTION>
                                                                                       NINE MONTHS ENDED
                                                                                         SEPTEMBER 30,
                                                                  YEAR ENDED        ------------------------
                                                              DECEMBER 31, 1996       1996            1997
                                                              ------------------    --------        --------
                                                               (DOLLARS IN THOUSANDS EXCEPT OPERATING DATA)
<S>                                                           <C>                   <C>             <C>
STATEMENT OF OPERATIONS DATA(1):
Operating revenues........................................          $     1          $    --         $ 1,924
Cost of operating revenues (exluding depreciation shown
  below)..................................................              305               44           2,512
Selling, general and administrative expenses..............              841              359           3,954
Depreciation and amortization expense.....................               54               --             818
Write-off of purchased software...........................              355               --              --
                                                                   --------          -------         -------
Loss from operations......................................           (1,554)            (403)         (5,360)
Interest income...........................................               63               31             338
Interest expense..........................................               --               --            (117)
                                                                   --------          -------         -------
Net loss..................................................          $(1,491)         $  (372)        $(5,139)
                                                                   ========          =======         =======
 
Net loss per share of common stock(2).....................          $ (1.27)         $ (0.40)        $ (0.37)
                                                                   ========          =======         =======
OTHER FINANCIAL DATA:
 
EBITDA(3).................................................          $(1,145)         $  (403)        $(4,542)
Summary Cash Flow Information:
  Net cash used in operating activities...................             (942)          (2,772)         (4,339)
  Net cash used in investing activities...................           (2,287)            (308)        (68,180)
  Net cash provided by financing activities...............           11,126            3,080         160,012
Capital expenditures......................................            3,659              308          15,907
 
Ratio of earnings to fixed charges(4).....................               --               --              --
 
Deficiency of earnings to fixed charges(4)................           (1,491)            (372)         (5,256)
OPERATING DATA (END OF PERIOD):
Total access lines........................................               50               --          12,482
  Business................................................               --               --           7,564
  Residential.............................................               50               --           4,918
Central office collocation sites..........................                9               --              16
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                             AS OF DECEMBER 31, 1996   AS OF SEPTEMBER 30, 1997
                                                             -----------------------   ------------------------
                                                                           (DOLLARS IN THOUSANDS)
<S>                                                          <C>                       <C>
BALANCE SHEET DATA:
Cash and cash equivalents (excluding restricted
  investments)...........................................            $ 7,897                   $ 95,390
Restricted investments...................................                 --                     56,767
Property and equipment, net..............................              3,250                     18,339
Total assets.............................................             12,339                    178,026
Long-term debt, including current maturities.............                 --                    156,589
Stockholders' equity.....................................             10,792                     14,808
</TABLE>
    
 
- ---------------
   
(1) Statement of Operations data for the year ended December 31, 1995 has been
    omitted, as no revenues or expenses were recognized and no cash transactions
    occurred between October 16, 1995 (inception) and December 31, 1995.
    
 
                                       27
<PAGE>   33
 
   
(2) Net loss per common share outstanding is calculated based on weighted
    average shares outstanding of 1,178,932 for the year ended December 31, 1996
    and 13,917,204 and 936,264 for the nine months ended September 30, 1997 and
    1996, respectively.
    
 
   
(3) EBITDA consists of earnings before interest, income taxes, depreciation and
    amortization. For the year ended December 31, 1996, EBITDA excludes a charge
    of $355,000 related to the one-time write-off of purchased software. While
    EBITDA is not an alternative indicator of operating performance to operating
    income or an alternative to cash flows from operating activities as a
    measure of liquidity as defined by generally accepted accounting principles
    and EBITDA may not be comparable to other similarly titled measures of other
    companies, management believes that EBITDA is a measure commonly used in the
    telecommunications industry to analyze and compare telecommunications
    companies on the basis of operating performance, leverage and liquidity. See
    the Statements of Cash Flows included in the Company's financial statements
    and the notes thereto appearing elsewhere in this Prospectus. EBITDA as
    defined in this footnote is not equivalent to Consolidated EBITDA as defined
    in the "Description of the Exchange Notes."
    
 
   
(4) The ratio of earnings to fixed charges is calculated by dividing earnings
    (loss) before income taxes, plus fixed charges excluding capitalized
    interest by fixed charges. For the year ended December 31, 1996, and for the
    nine months ended September 30, 1996, the Company incurred net losses and
    had no fixed charges. For the nine months ended September 30, 1997, the
    Company incurred net losses of $5,139,000 and had fixed charges of $117,000.
    
 
                                       28
<PAGE>   34
 
               MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                      CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
   
     MGC began providing competitive local exchange services to small businesses
and residential users in December 1996. The Company expects to begin offering
long distance services in its existing markets during first quarter 1998. The
Company has adopted a strategy of providing services through the leasing of
unbundled network elements of the ILEC and dedicated transport to the Company's
switches. Currently, the Company has switches fully operational in Las Vegas,
Atlanta and the Inland Empire region of California.
    
 
   
     The development and expansion of the Company's business will require
significant expenditures. The Company has made the strategic decision to install
Company-owned switches with broad market coverage, which initially increases its
level of capital expenditures and operating losses. The Company believes this
will enhance the Company's financial performance over the long term through
control of customer accounts.
    
 
   
     The Company's principal operating expenses consist of: direct costs,
operating costs and depreciation. Direct costs consist of access fees, line
installation expenses, transport expenses, engineering costs and long distance
expenses. Operating costs are comprised of sales and marketing, customer service
and general and administrative expenses. As the Company expands into new
markets, both direct costs and selling, general and administrative costs will
increase prior to achieving significant revenue. Significant levels of marketing
activity may be necessary in new markets in order for the Company to build a
customer base large enough to generate sufficient revenue to offset such
marketing expenses. In addition, selling, general and administrative costs may
increase in the short term after the Company enters a new market because many of
the fixed costs of providing service in new markets are incurred before
significant revenue can be expected from those markets.
    
 
   
     The Company has experienced operating losses and generated negative
operating cash flow since inception and expects to continue to generate negative
operating cash flow through 1999, and to incur significant operating losses
during the next several years while it installs and expands its networks and
develops its business. There can be no assurance the Company's revenue or
customer base will grow or that the Company will be able to achieve or sustain
positive cash flow.
    
 
RESULTS OF OPERATIONS
 
   
     The Company's operations prior to December 1996 were limited to start-up
activities and, as a result, the Company's revenues prior to December 1996
(limited to interest earned on cash deposits) and expenditures for such period
are not indicative of anticipated revenues which may be attained or expenditures
which may be incurred by the Company in future periods. The Company did not
begin revenue operations until December 1996. As a result, any comparison of the
three or nine months ended September 30, 1997 with the three or nine months
ended September 30, 1996 would not be meaningful. Consequently, the following is
a comparison of the second quarter 1997 with the third quarter 1997.
    
 
   
  Quarter over Quarter Comparison -- September 30, 1997 vs. June 30, 1997
    
 
   
     Total operating revenues for the quarter ended September 30, 1997 were $1.1
million as compared to $.7 million for the quarter ended June 30, 1997. The
increase from the second quarter 1997 to the third quarter 1997 is a result of
the increase in the number of lines placed in service during the third quarter.
The Company had 12,482 lines in service at the end of the third quarter as
compared to 9,002 lines in service at the end of the second quarter.
    
 
   
     Cost of operating revenues for the quarter ended September 30, 1997 was
$1.2 million as compared to $.8 million for the quarter ended June 30, 1997. The
increase from quarter to quarter is due to the increased number of lines placed
in service during the third quarter 1997.
    
 
   
     For the quarter ended September 30, 1997, selling, general and
administrative expenses totaled $1.8 million as compared to $1.3 million for the
quarter ended June 30, 1997. These expenses were incurred in
    
 
                                       29
<PAGE>   35
 
   
connection with the initial marketing of the Company's services and the
continued buildout of the Company's network. These expenses consisted primarily
of payroll expenses, provision for bad debts, professional fees and rents.
    
 
   
     Depreciation expense includes depreciation on switching equipment as well
as general property and equipment. For the quarter ended September 30, 1997
depreciation was $.4 million as compared to $.3 million for the quarter ended
June 30, 1997. This increase is a result of the Company's placing additional
assets in service during the third quarter in accordance with the planned
buildout of its network.
    
 
   
     Interest expense for third quarter 1997 totaled $.1 million. This amount is
attributable to interest incurred on the Notes issued by the Company in late
September 1997.
    
 
   
     The Company incurred net losses of $2.3 million and $1.6 million during
third quarter 1997 and second quarter 1997, respectively.
    
 
   
  Nine months ended September 30, 1997
    
 
   
     During the nine months ended September 30, 1997, the Company generated $1.9
million in operating revenues, had cost of operating revenues of $2.5 million
and incurred selling, general and administrative expenses of $4.0 million in
connection with the initial marketing of its services and the continued buildout
of its network. These expenses consisted primarily of payroll expenses,
provision for bad debts, professional fees and rents.
    
 
   
     During the nine months ended September 30, 1997, the Company recorded bad
debt expense of approximately $306,000. To minimize its bad debt exposure, the
Company is implementing a policy generally requiring new customers to prepay for
specified services and usage estimates. Receipt of the prepayment will generally
be required prior to service being activated. Additional personnel have been
dedicated to collections and credit monitoring to seek to reduce the Company's
bad debt. The new credit policy is expected to allow the Company to maintain its
focus on low cost delivery of basic telephone services.
    
 
   
     Depreciation expense for the nine months was $.8 million as a result of the
Company's assets placed in service in accordance with the planned buildout of
its network.
    
 
   
     Interest expense for the nine months ended September 30, 1997 totaled $.1
million. This amount is attributable to interest incurred on the Notes issued by
the Company in late September 1997.
    
 
   
     The Company had interest income of $.3 million for the nine months ended
September 30, 1997, as a result of earnings on investments made with the
proceeds of its prior private placements.
    
 
   
     As a result, the Company incurred a net loss in the nine month period of
$5.1 million. The loss is primarily attributable to the expenses incurred during
the period in connection with the continued development of the Company's
business.
    
 
  Year ended December 31, 1996
 
     During the year ended December 31, 1996, the Company generated $751 in
operating revenues as a result of commencing service during the month of
December. The Company had cost of operating revenues of $304,936 which
represents primarily fixed costs. In addition, the Company incurred operating
expenses of $1,250,295 in connection with the commencement of operations and the
buildout of its network. These expenses consisted primarily of payroll expenses,
professional fees, expenses related to the introduction of initial service and a
one-time write-off of purchased software.
 
     The Company earned interest income in the period of $63,122.
 
     As a result, the Company incurred a net loss in the period of $1,491,358.
This loss is primarily attributable to the expenses incurred in connection with
the initial development of the Company's business.
 
                                       30
<PAGE>   36
 
LIQUIDITY AND CAPITAL RESOURCES
 
   
     The Company's operations have required substantial capital investment for
the purchase of telecommunications equipment and the design and development of
the Company's networks. Capital expenditures for the Company were $3.7 million
and $15.9 million in 1996 and the first nine months of 1997, respectively. The
Company expects that it will continue to have substantial capital requirements
in connection with the (i) purchase of switches necessary for expansion of local
exchange services and provision of long distance services, and (ii) development
of new markets. Management expects capital expenditures of $40.3 million for
1998.
    
 
   
     The Company has funded a substantial portion of these expenditures through
the private sales of equity securities and the issuance of debt. From its
inception through September 30, 1997, the Company raised approximately $17.1
million from private sales of Common Stock. In September 1997, the Company
completed an offering of units consisting of $160 million of the Notes and
warrants to purchase shares of Common Stock.
    
 
     The substantial capital investment required to initiate the Company's
services and the funding of the Company's initial operations has resulted in
negative cash flow since the Company's inception. This negative cash flow is a
result of the requirement to establish the Company's switching network in
anticipation of connecting revenue generating customers. The Company expects to
continue to produce negative cash flow through 1999 due to expansion activities
associated with the development of the Company's markets. There can be no
assurance the Company will attain break-even cash flow in subsequent periods.
Until sufficient cash flow is generated, the Company will be required to utilize
its current and future capital resources to meet its cash flow requirements and
may be required to issue additional debt and/or equity securities.
 
     At the closing of the sale of the Notes, the Company used approximately
$56.8 million of the net proceeds of the sale of the Notes to purchase a
portfolio of Government Securities that has been pledged as security to cover
the first six interest payments on the Notes and the Company used approximately
$3.1 million of the net proceeds to pay accounts payable incurred in connection
with the acquisition of equipment. In addition, the Company has granted the
holders of the Notes a security interest in certain of the Company's
Telecommunications Equipment.
 
   
     In November 1997, the Company completed the Preferred Stock Offering which
consisted of the sale of 5,148,570 shares of Series A Convertible Preferred
Stock (the "Preferred Stock") at $3.50 per share for net proceeds of $16.7
million. Each share of Preferred Stock is convertible into one share of Common
Stock, subject to antidilution adjustments under certain circumstances, and is
automatically convertible upon the consummation of a public offering of Common
Stock of a certain size and at a certain price per share. The Preferred Stock
provides for a cumulative dividend of 8% per annum and participates in dividends
paid with respect to the Common Stock. The holders of the Preferred Stock are
entitled to elect two members of the Company's Board of Directors. The Preferred
Stock is subject to redemption after the maturity of the Notes (i.e., as of
October 2, 2004) and may become redeemable after November 26, 2002, if the
Company would be allowed to issue Disqualified Stock in such amount at such time
under the terms of the Indenture. See "Description of the Exchange
Notes -- Certain Covenants -- Incurrence of Indebtedness and Issuance of
Disqualified Stock."
    
 
   
     The Company expects its available cash, including the proceeds from the
sale of the Notes and the Preferred Stock Offering will be sufficient to fund
its capital plan and operations through 1999. If the Company's expansion occurs
more rapidly than currently anticipated or if the Company's available cash
resources are not sufficient to fund all of the Company's operating expenses and
capital expenditures, the Company will require additional capital before that
time. In addition, depending on market conditions, the Company may determine to
raise additional capital before such time. There can be no assurance as to the
availability or the terms upon which such financing might be available.
Moreover, the Indenture will impose certain restrictions upon the Company's
ability to incur additional indebtedness or issue preferred stock.
    
 
                                       31
<PAGE>   37
 
IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS
 
     In February 1997, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards No. 128, Earnings Per Share (SFAS
128), which establishes standards for computing and presenting earnings per
share (EPS). It replaces the presentation of primary and fully diluted EPS with
a presentation of basic and diluted EPS. SFAS 128 is effective for financial
statements for both interim and annual periods ending after December 15, 1997.
Earlier application is not permitted. After adoption, all prior period EPS data
should be restated to conform to SFAS 128.
 
   
     The Company will adopt SFAS 128 in the fourth quarter of 1997. The pro
forma impact of SFAS 128, on the nine months ended September 30, 1997 and the
year ended December 31, 1996, is that basic and diluted EPS would have been
equal to net loss per share of common stock as presented in the respective
statements of operations.
    
 
     In February 1997, the FASB issued Statement of Financial Accounting
Standards No. 129, Disclosure of Information about Capital Structure (SFAS 129).
SFAS 129 establishes standards for disclosing information about an entity's
capital structure. The Company currently complies with the disclosure
requirements of this statement which is effective for periods ending after
December 15, 1997. Implementation will not impact the Company's financial
presentation of its capital structure.
 
   
     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 130, Reporting Comprehensive Income (SFAS 130). SFAS 130 requires companies
to classify items of other comprehensive income by their nature in a financial
statement and display the accumulated balance of other comprehensive income
separately from retained earnings and additional paid-in capital in the equity
sections of a statement of financial position, and is effective for financial
statements issued for fiscal years beginning after December 15, 1997. The
Company is currently assessing the impact on the financial statements for the
nine months ended September 30, 1997 (unaudited) and for the year ended December
31, 1996, and believes that SFAS 130 will not result in comprehensive income
different from net income as reported in the accompanying financial statements.
    
 
     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 131, Disclosure About Segments of an Enterprise and Related Information
(SFAS 131). SFAS 131 establishes additional standards for segment reporting in
financial statements and is effective for fiscal years beginning after December
15, 1997. The Company currently operates as one segment.
 
                                       32
<PAGE>   38
 
                                    BUSINESS
 
INDUSTRY HISTORY
 
     The present structure of the U.S. telecommunications market resulted
largely from the divestiture of the "Bell System" in 1984 (the "Divestiture").
As a result of the Divestiture, seven regional bell operating companies
("RBOCs") were created to offer services in geographically defined areas called
local access transport areas ("LATA's"). The RBOC's were separated from the long
distance provider, AT&T, resulting in the creation of two distinct industries:
local phone service and long distance (also known as interexchange). Divestiture
did not result in competition in the local exchange market, but it did provide
for direct open competition for long distance. As a result, in the past 13
years, hundreds of competitors, including MCI and Sprint now have captured in
excess of 45% of the long distance market. During this time period, several
factors have served to promote competition in the local exchange market,
including the RBOCs and ILECs monopoly position and regulated pricing structure,
which provided little incentive for the ILECs to reduce prices, improve service
or upgrade their networks. Customers' desire for an alternative to the RBOC/ILEC
monopoly and the introduction of advanced technology products (such as cellular)
have spurred the desire of consumers for alternatives in the local phone market.
 
     Established in the mid-1980's, "competitive access providers" or "CAPs"
were among the first competitors in the local exchange market. CAPs provided
non-switched services (i.e., dedicated special access and private line) by
installing fiber optic facilities connecting interexchange carrier's ("IXCs")
points of presence ("POPs") within a metropolitan area and, in some cases,
connecting customers (primarily large businesses and government agencies) with
IXCs. CAPs used the substantial capacity and economies of scale inherent in
fiber optic cable to offer service that was generally less expensive and of a
higher quality than the ILECs. In addition, CAPs offered shorter installation
and repair intervals and improved service reliability in comparison to the
ILECs. At the same time, large numbers of regional and/or national IXCs came
into existence to compete with AT&T in the interexchange market.
 
     As CAPs proliferated during the latter part of the 1980's and early 1990's,
regulators in some states and at the federal level issued rulings which favored
competition and promoted the opening of markets to new entrants. These rulings
allowed CAPs to offer a number of new services, including, in certain states,
certain local network services.
 
     In the late 1980's and early 1990's, CAPs could compete effectively only
for dedicated special access and private line services to customers in buildings
physically connected to separate, privately owned CAP networks. In the early
1990's, federal regulations permitted CAPs to interconnect their networks with
the ILEC networks at the ILEC central offices. CAPs then had the opportunity to
increase significantly the number of customers and markets served without
physically expanding their networks. By connecting to the ILEC central offices,
CAPs were able to use the extensive ILEC networks to reach additional customers,
thus conserving their own capital while significantly expanding their potential
markets.
 
   
     By the summer of 1995, several states began opening their markets to local
exchange competition, thus permitting CAPs to become competitive local exchange
companies ("CLECs"). On February 8, 1996, the Act was signed into law. The Act
provides a framework by which all states must allow competition for local
exchange services. The Company believes the Act will benefit the Company by,
among other things, (i) increasing market access, (ii) requiring network
interconnections, (iii) establishing number portability and (iv) providing
standards for reciprocal compensation, unbundling of network elements and resale
of ILEC network services. The current law is intended to create incentives for
certain ILECs (including all RBOCs) to facilitate access to their networks by
CLECs in order to develop "meaningful competition" in the local exchange market.
Under the Act, the RBOCs will not be permitted to provide intrastate interLATA
service until they have demonstrated compliance with the foregoing to the FCC.
On December 31, 1997, a federal judge ruled that certain of these provisions are
unconstitutional on the grounds that RBOCs were unfairly denied access to the
long distance segment of the industry. This decision is currently on appeal. The
estimated market for telecommunications services (local and long distance) in
the United States was approximately $165 billion in 1996.
    
 
                                       33
<PAGE>   39
 
THE COMPANY
 
   
     The Company is a rapidly growing, switched-based provider of
telecommunications services, offering competitive local exchange services to
small business and residential users. The Company focuses primarily on offering
basic telephone services, including switched local dialtone and enhanced calling
features such as voice mail, call waiting and call forwarding ("basic telephone
services"). These services are required by virtually all users of
telecommunications. The Company does not currently offer long distance services,
but intends to integrate long distance services with its local service offerings
in Las Vegas in January 1998. The Company provides its basic telephone services
through the leasing of unbundled network elements provided by ILECs, and through
the leasing of dedicated transport to the Company's combined local and long
distance Nortel DMS 500 switches. ILEC refers to the incumbent monopoly provider
of local exchange service prior to the opening of local exchange services to
competition. The ILEC may be a regional Bell operating company (RBOC) or a
non-RBOC incumbent (such as Sprint Central Telephone of Nevada). The Company
began its operations in Las Vegas in December 1996 and became operational in
suburban Atlanta and Los Angeles in December 1997. The Company expects to
commence offering long distance services to customers in suburban Atlanta and
Los Angeles in first quarter 1998.
    
 
     At September 30, 1997, the Company had 12,482 access lines in service. Of
the lines in service, 7,564 were business and 4,918 were residential. During
September 1997, the Company sold 2,851 access lines and placed 684 net lines in
service. Net lines is the number equal to gross lines added less the number of
previously existing lines disconnected. The Company has used the results of its
experience in Las Vegas to better refine its strategy, products and customer
service procedures and to develop a sophisticated back office operation.
 
   
     The Company intends to continue expanding its markets by targeting
residential and small business users in suburban areas of large metropolitan
markets. The Company intends to expand its operations to seven additional
markets in 1998 and an additional seven markets in 1999. As of September 30,
1997, the Company has obtained CLEC certification in four states (with one
application pending), has completed interconnection agreements with five ILECs
(with an additional four in negotiation), and has negotiated transport
arrangements with a long distance carrier.
    
 
     The Company believes the implementation of its network architecture
represents a low risk, demand driven approach requiring less capital deployment
than that required for the build out of a fiber optic infrastructure. The
Company's network is comprised of leased, unbundled elements of the ILEC's
network coupled with the collocation of Company owned equipment in the ILEC's
central offices. The Company adds transport capacity on an incremental basis
with the addition of new customers, and utilizes compression technology to
reduce its transport costs. Management believes the Company's network
architecture and equipment installation plans will enable it to (i) increase the
size of its addressable market to reach a significant number of new potential
customers, and (ii) achieve efficient network operations and economies of scale
in sales and marketing.
 
     Management believes offering superior customer service is critical to
achieving its goal of capturing market share. The Company is continually
enhancing its service approach which utilizes a well-trained team of customer
sales and service representatives to coordinate customer installation, billing
and service. A comprehensive back office support system is also a critical
component of the Company's service goal. The Company has installed a fully
automated, proprietary management information system which is designed to
provide comprehensive, integrated features addressing all aspects of its
business, including customer care and billing, general ledger, payroll, fixed
asset management, purchasing and personnel. The Company believes this system is
readily adaptable to changing circumstances and is scalable to support the
Company's operations throughout its expected growth.
 
   
     The Company was incorporated as NevTel, Inc., a Nevada corporation in 1995.
In 1996, the Company changed its name to MGC Communications, Inc. Its principal
office is located at 3301 N. Buffalo Drive, Las Vegas, Nevada 89129. The
Company's telephone number is (702) 310-1000.
    
 
     Key components of the Company's operating strategy are described below.
 
                                       34
<PAGE>   40
 
BUSINESS STRATEGY
 
     Early in Addressing Tier II Sectors of Tier I Markets.  In order to gain
and sustain a competitive advantage, the Company intends to move quickly to
implement its switch-based, unbundled transport networks. MGC believes it is
currently the only CLEC utilizing as its exclusive network strategy the
employment of combined local and long distance switches and unbundled transport
and local loops to target small business and residential customers in suburban
areas of Tier I markets. The Company is targeting suburban areas because they
have concentrated numbers of basic telephone service users, such as small
businesses (3-50 lines), pay phone operators, multiple dwelling unit customers
and single family residences. The Company believes its only significant
switch-based competition is the ILEC in its target market segments.
 
     Success Based Capital Deployment.  Virtually all of the Company's planned
capital expenditures are related to switching and incremental infrastructure
resulting from additions of new revenue generating customers. Management
believes this provides for a low risk profile to the Company's planned capital
deployment and will provide an attractive return on invested capital.
 
     Provide Simplified Product Offerings.  MGC's target market segment is
comprised of basic telephone service users. While requiring sophistication for
their delivery, the Company's products and services are perceived as simple,
basic solutions. The Company has consciously narrowed its offerings, choosing
not to sell more complex telephone or data solutions or resell other complex
products at this time. Currently, the Company believes most CLECs which are
bundling such services are focused on larger businesses that require a wider
range of telecommunications products for their more sophisticated needs.
 
     Provide Superior Customer Service.  The Company believes superior customer
service will be critical to the success of its expansion plan. The Company's
proprietary customer-focused management information system allows immediate
access to the Company's customer data, enabling quick and effective responses to
customer requests and needs at any time. This system permits the Company to
present its customers with one fully integrated monthly billing statement for
all basic telephone services. In addition, by having a centralized call center
in Las Vegas, which will handle all inquiries and orders for new service, the
Company should be able to control personnel and their training to a greater
degree than if call centers were maintained in each market.
 
     Targeted Sales and Marketing Effort.  The Company's sales programs include
direct sales efforts, vendor and affinity programs, direct mail and
telemarketing. The Company has both local and national sales personnel. The
Company's national sales group concentrates on large basic telephone service
users such as multi-tenant buildings, pay phone operators and wholesale
customers. The local sales group coordinates activities with equipment vendors
and affinity groups and also assists with the national sales efforts. They also
make selective calls on business customers who have large basic telephone
service requirements which may not be solicited by the Company's national group.
 
     Leverage Sophisticated Information System and Centralized Call Center.  The
Company's proprietary management information system enables the user to record,
maintain and retrieve all customer information in one environment, including
such customer's services, equipment and billing.
 
     Capitalize on Management Expertise.  The Company has recruited a team of
experienced business executives with entrepreneurial backgrounds. Maurice J.
Gallagher, Jr., the Chairman, has been a founder of a number of start-up
businesses, including ValuJet, Inc. ("ValuJet") and BankServ, LLC ("BankServ").
Nield J. Montgomery, CEO and President, has over 34 years of telephone
experience, most recently with ICG. Other executives have held senior management
positions at major telecommunications companies, including, among others,
Sprint, Centel, NYNEX, Contel and GTE.
 
NETWORK STRATEGY
 
     Accelerate Provision of Local Exchange Services.  To accelerate
provisioning of local exchange services, the Company selects larger markets with
a relatively cooperative ILEC and a pro-competitive regulatory environment. The
Act significantly improved the opportunity for competition in the local exchange
market by mandating ILECs to enter into agreements with competitors such as the
Company for central office collocation and unbundling of local services. The
Company believes implementation of such pro-competitive policies creates
favorable opportunities to more aggressively pursue the provisioning of local
exchange services.
 
                                       35
<PAGE>   41
 
The Company has interconnection agreements in place with BellSouth, GTE,
PacBell, Sprint Central Telephone of Nevada and Ameritech and expects to have
agreements with NYNEX in Massachusetts, Southwestern Bell in Texas, Bell
Atlantic in Pennsylvania and Central Telephone Company of Illinois. The Company
believes it is well-positioned to add switches and associated services with
minimal increases in support infrastructure.
 
     Low Cost Network Architecture.  One of the most critical elements of
creating a low-cost structure is a service provider's decision as to the type of
network to build. MGC has chosen to exclusively build a switch-based network and
to lease the necessary transport and local loops on an incremental basis, as
demand dictates, from ILECs and CAP/CLECs. As a result, the Company will not be
burdened by the carrying costs of a constructed transport network. MGC believes
this low-cost approach will allow the Company to precisely target its capital
expenditures to the specifics of each market and developing conditions.
 
     The Company believes it will be able to lease the necessary transport at
reasonable prices. Prior to the Act, the ILEC's fiber transport was subject to
tariffs and usually priced substantially higher than a competing CAP/CLEC. With
the passage of the Act and subsequent state initiatives and introduction of
facilities-based competition, management believes network elements have become
available at cost-based prices and basic transport services have become
available at competitive prices. Most of MGC's targeted markets have numerous
competing transport suppliers with attractive unbundled transport prices.
 
     Control Customer Elements of the Networks.  Connection to customers
represents an important component of MGC's network strategy. Network control
issues of the Company's architecture are different from those of other CLECs.
MGC does not have to contend with local governments or landlords to obtain
permits or consents to construct its network, but rather with the ILEC to
acquire local loops. While this interface can be challenging, it has proven to
be a manageable process to date. Once a line has been leased from an ILEC, MGC
achieves control of its network similar to that of other CLECs. Specifically,
all changes to features, additions and billing are under the direct control of
the Company with the exception of repairs which are infrequent and may require
the participation of the ILEC's network maintenance staff.
 
     Create a Uniform Technological Platform.  A critical component of the
Company's low cost formula is the ability to standardize its switch
configuration. Unlike a traditional long distance or local switch, the Nortel
DMS 500 switch enables the Company to provide local and long distance services
from a single platform. The Company believes having a standardized switch
platform will enable it to (i) deploy features and functions quickly in all of
its networks, (ii) expand switch capacity in a cost effective manner, (iii)
lower maintenance costs through reduced training and spare parts requirements
and (iv) pursue a "switch in the box" rapid network deployment solution (under
development with Nortel) which should allow the Company to rapidly enter new
markets. In addition, the scalability and capacity of its switches will allow
the Company to switch calls from more than one market, which enhances the
Company's ability to benefit from a clustered approach to the building of its
networks.
 
RECENT REGULATORY DEVELOPMENTS
 
     The Act and the issuance by the FCC of rules governing local competition,
particularly those requiring the interconnection of all networks and the
exchange of traffic among the ILECs and CLECs, as well as pro-competitive
policies already developed by state regulatory commissions, have caused
fundamental changes in the structure of the local exchange markets. On July 18,
1997, the U.S. Court of Appeals for the Eighth Circuit issued a final decision
vacating the FCC's interconnection pricing rules and "most favored nation" rules
as well as certain other interconnection rules. See "Regulation." Despite this
action, the Company's analysis shows interconnection arrangements that have been
approved or mandated by state regulatory commissions have been consistent with
the intent of the Act and the Company's business plan. On October 14, 1997, the
U.S. Court of Appeals for the Eighth Circuit ruled that ILECs are under no
obligation to provide AT&T or anyone else with a rebundled package of individual
network elements. The Company believes that the impact of this ruling is neutral
to the Company in light of the Company's switch-based network strategy employing
unbundled network elements and may be beneficial in the short-term by delaying
entrance into the local service market by IXC's such as AT&T.
 
                                       36
<PAGE>   42
 
     On May 16, 1997, the FCC released an order that fundamentally restructured
the "access charges" ILECs and CLECs charge to interexchange carriers and end
user customers. The Company believes the FCC's new access charge rules do not
adversely affect the Company's business plan, and they in fact present
significant opportunities for new entrants, including the Company. Aspects of
the access charge order may be changed in the future. At least ten parties have
filed appeals with federal courts and numerous parties have asked the FCC to
reconsider portions of its new rules.
 
   
     On December 31, 1997, a federal judge in Dallas ruled key sections of the
Act unconstitutional on the grounds that RBOCs were unfairly denied access to
the long distance segment of the industry. The provisions held unconstitutional
require RBOCs to show sufficient cooperation in allowing access to their
networks before being approved to offer long distance services. This decision
was immediately appealed by numerous IXCs.
    
 
PRODUCTS AND SERVICES
 
   
     The Company focuses primarily on offering basic telephone services,
including switched local dialtone and enhanced calling features such as voice
mail, call waiting and call forwarding ("basic telephone services"). These
services are required by virtually all users of telecommunications. The Company
does not currently offer long distance services, but intends to integrate long
distance services with its local service offerings in its existing markets in
first quarter 1998. The Company's specific product offerings are:
    
 
     - Business Lines -- Single line business (with optional feature packages),
       Centrex service, access trunks and customer owned coin operated telephone
       lines ("COCOTs").
 
     - Residential Lines -- Single and second line basic telephone service with
       optional feature packages, including multiple dwelling unit lines.
 
   
     - Long distance products consisting of Outbound 1+, Inbound 800/888 and
       Calling Cards (commencing during first quarter 1998).
    
 
     The Company has negotiated a contract with a vendor for long distance
services. The Company expects its cost per minute rate will make the Company's
long distance offering very competitive. The Company believes it will be able to
charge its local service customers a low cost long distance price because the
call is originating through the Company's switches, eliminating a portion of the
switched access charges. To obtain the Company's most attractive long distance
rates, customers will have to purchase the Company's switched local service. The
Company expects to offer everyday prices to its customers of ten cents per
minute or less for long distance calls and more attractive rates for customers
with greater volumes. The Company believes its low cost long distance will
generate business from all of the Company's customer segments.
 
     In order to ensure that its products and services are identical to those
offered by the ILEC, the Company has made arrangements with the ILEC and other
carriers for the provision of interim number portability, operator and directory
services, 911 services and Yellow Page and White Page listings. Interim number
portability is available to customers that desire to retain existing telephone
numbers by charging a nominal fee for remote call forwarding. Operator services
are offered through a major IXC carrier or ILEC. Emergency 911 services are
provisioned through links to the ILEC switch which, in turn, is connected to a
911 service bureau. The Company's proprietary management information system
updates customer addresses and immediately supplies them to the appropriate
emergency authorities. In addition, the Company's interconnection agreements
with the ILEC in each of its markets will contain a provision requiring the ILEC
to list each of the Company's business customers in the Yellow Pages.
 
MARKETS
 
   
     MGC is moving quickly to exploit its "early to market" strategy. The
Company expects to concentrate on Tier II Sectors of Tier I Markets. These Tier
II Sectors contain large populations of residential and small business,
including COCOT, prospects. In addition to its currently operational markets of
Las Vegas, Atlanta and the Inland Empire, during fiscal 1998 and 1999, the
Company is targeting 14 additional markets in the states of California, Florida,
Illinois, Massachusetts and Texas.
    
 
                                       37
<PAGE>   43
 
     These markets were chosen because of the cooperative profile of the ILECs
and their pro-competitive regulatory environments. The Company believes that
BellSouth in Georgia and Ameritech in the Chicago area are progressive RBOCs
which are publicly on record favoring deregulation and cooperation with
competition. Additionally, in the Park Ridge and Des Plaines area, adjacent to
O'Hare Airport, the Company expects to collocate its facilities with Sprint and
to work with Ameritech as well. In the Los Angeles region the Company will
collocate with GTE, but work with PacBell as well. Both incumbents have a large
presence in the Los Angeles basin.
 
     The Company intends to continue expanding its markets by targeting
residential and small business users in suburban areas of large metropolitan
markets. The Company's ability to commence operations in each of the above
markets in accordance with its expansion plan is based on many factors over
which the Company may not have control, including the ability of the Company to:
(i) negotiate interconnection agreements at favorable rates, (ii) obtain all
regulatory approvals required, (iii) install switches at locations from which
the Company can access the relevant market, (iv) obtain timely and reasonably
priced collocation space in the ILEC central offices, and (v) employ qualified
personnel at each location. As a result, there can be no assurance the Company
will be able to establish its service in each of the above areas at the time
indicated, if at all. There can be no assurance the Company will not pursue
other markets in lieu of or in addition to the foregoing.
 
SALES AND MARKETING
 
     The Company concentrates its sales and marketing efforts on users of basic
telephone services. The specific retail customer groups the Company pursues are:
 
     - Small Business -- Targeted small business customers typically have
       between three and 50 lines. The Company also targets COCOTs.
 
     - Residential -- The Company solicits single family residential users,
       including those located in multi-dwelling units.
 
     Sales Programs -- Retail.  The Company's highly focused marketing efforts
allow for efficiency in capital deployment by generating well-managed profitable
growth through increased market share with minimal customer churn. Retail sales
programs include direct sales efforts, vendor and affinity programs, direct mail
and telemarketing.
 
     As of September 30, 1997, the Company employed 11 local sales personnel and
assistants and three national sales personnel. Within each local market, the
Company expects to employ five sales personnel and two sales assistants. The
national sales force is responsible for identifying and soliciting prospective
multi-dwelling unit owners and managers and COCOT customers. The local sales
personnel are responsible for coordinating activities with equipment vendors and
assisting the national sales effort for pay phones and multi-dwelling unit
programs. Such personnel also make selective calls to local business customers
who have been identified by the Company as possessing large basic telephone
requirements but have not otherwise been solicited by the Company's national
group.
 
     To complement its local and national sales representatives, the Company
intends to use established telephone equipment vendors as agents to sell the
Company's local and long distance service in conjunction with equipment sales to
potential business customers. In Las Vegas, for instance, the Company is
currently selling local service through equipment vendors to whom it pays a
commission for each sale.
 
     Affinity programs are being developed to work with organizations such as
schools, religious organizations, charities and local chambers of commerce
pursuant to which the Company and the selected organizations will jointly
promote the Company's services. The organizations will receive a royalty for
each member who purchases the Company's service.
 
     Direct mail materials have been and will continue to be used to target
specific areas where the Company will have established service. These materials
introduce the Company's service, single billing convenience and lower cost for
both local and long distance service. In addition, telemarketing efforts will
also be used to solicit
 
                                       38
<PAGE>   44
 
   
primarily residential customers. The Company is testing a variety of
telemarketing alternatives for use with its targeted prospects.
    
 
     The Company targets COCOTs and multi-dwelling unit sales on a national
basis from its headquarters in Las Vegas. In addition to offering low rates to
COCOTs, the Company has a proprietary management information system designed to
facilitate the verification of dial around compensation from IXCs. MGC currently
has contracts with several pay phone operators in Las Vegas.
 
     The Company also targets apartments and multi-dwelling units by offering
owners and managers a turn-key telephone product for its occupants. To initiate
such service at an apartment complex, the Company will initially utilize the
ILEC's unbundled loop from the apartment to the Company's switch. Once
installed, the service will remain active for the next tenant. Under the
Company's multi-dwelling unit program, the tenant does not have to arrange for
the service independently, pay deposits (which can be managed through the
deposit process with the apartments) or wait for installation. Additionally,
installation charges may be reduced from traditional amounts charged to
individual customers. After the Company and the apartment complex complete the
initial installation, the apartment owner/manager will be able to offer new
tenants telephone service the day the lease is signed. A call from the apartment
manager or the tenant will provide the necessary customer information to begin
service. Larger complexes (100 or more lines) will allow the Company to
economically install hardware at the apartment site and lease T1 spans to
transport the traffic directly to its switch, bypassing the ILEC's loops. For
example, by avoiding the leasing of unbundled local loops for a 125 unit
multi-dwelling complex, the Company, in Atlanta, would avoid paying monthly
lease charges to the ILEC of $1,777 and the aggregate cost of alternate
transport would be approximately $700 for a cost savings of $1,077 per month.
 
     Sales Programs -- Wholesale.  The Company also seeks wholesale customers
(i.e., long distance IXCs) who desire to resell the Company's local service
product offerings. The Company is selling this product through its national
sales force. In May 1997, the Company signed its first wholesale contract to
provide local service in Las Vegas to a long distance reseller.
 
     Advertising.  To better manage its resources, the Company strives to
generate a steady flow of service installation calls. As a result, the Company,
at this time, does not plan extensive general media advertising which it
believes could stimulate a deluge of calls and cause a subsequent erosion of
service and responsiveness of its customer service representatives ("CSRs"). The
Company's inauguration of service in Las Vegas generated interest in both the
print and broadcast media.
 
     Additionally, the Company expects to benefit from its listing in the
information pages of the ILEC's directory. The Company intends to work closely
with the phone book publisher to insure timely and accurate placement of its
information.
 
NETWORK
 
     Network Architecture.  MGC has chosen to exclusively build a switch-based
network and to lease transport and local loops on an incremental basis, as
demand dictates, from ILECs and CAP/CLECs. As a result, the Company is not and
will not be burdened by the operating and financing expenses associated with
owning a fiber optic transport network. By using the ILEC's or CAP/CLEC's
network of interoffice fiber and loops through collocation, the Company seeks to
reach a broad market of customers for a fraction of the cost of a constructed
fiber network.
 
     The Company's switch deployment plan includes the acquisition, where
possible, of sites within 1,000 feet of ILEC central offices, which allows the
Company to interconnect its network to the ILEC by a copper interface (as is the
case with the Company's site in Pomona, California, a suburb of Los Angeles).
The copper interface is substantially less expensive than a fiber interface and
collocated equipment. If a site within 1,000 feet is not secured, the Company
will interconnect via a fiber interface and collocated equipment. The Company
generally plans to control its switch sites through ownership of the property,
rather than leasing. The Company believes that property ownership is desirable
for control of its long term future. To date, the Company has acquired title
only to its facility in Pomona, California.
 
                                       39
<PAGE>   45
 
   
     Las Vegas Network.  MGC's Las Vegas network demonstrates the network
concept. The Company installed a Nortel DMS 500 digital switch with
approximately 7,000 lines of capacity and connections (via leased transport from
Sprint, the ILEC) to nine of the 19 Sprint COs in Las Vegas at an equipment cost
of approximately $3.3 million. This project was completed in seven months and
the switch became operational in December 1996. In response to its initial
success in provisioning access lines, the Company has expanded its capacity. By
the end of September 1997, the Company spent an additional $4.4 million to
increase network capacity to approximately 20,000 lines and connected an
additional seven COs (for a total of 16 of the 19 COs in the Las Vegas
metropolitan area).
    
 
     This network design, which leverages Sprint's facilities, provides the
Company with a broad reach. The initial $3.3 million invested gave MGC access to
an addressable market of approximately 450,000 lines. The June expansion
increased the Company's addressable market to approximately 95% of Las Vegas'
800,000 lines.
 
     In Las Vegas, the Company has signed an interconnection agreement with a
term of two years. In the Las Vegas market, MGC utilizes Sprint (the ILEC),
NextLink and ACSI for transport. The Company seeks to select the transport
provider that can best interconnect its locations through redundant network at
the lowest possible price.
 
     The Company believes it will be able to lease the necessary transport at
reasonable prices in markets in addition to Las Vegas. Prior to passage of the
Act in February 1996, ILEC's fiber transport was subject to tariffs and usually
priced substantially higher than a competing CAP/CLEC. With the passage of the
Act, ILECs were required to lease their network elements at cost based prices.
MGC seeks to find two to three competing transport suppliers in its markets with
attractive competitive prices.
 
     The Company believes the traditional copper loop connection from the ILEC
central office to the end user (the "last mile") is getting considerable
attention from manufacturers looking for more economic solutions. Beyond the
traditional copper based T1 span and the more recent direct fiber connections,
wireless radio including 38GHz and 2.4GHz are becoming practical and, often,
less costly. The Company believes "last mile" solutions, including an array of
new technology with significant bandwidth improvement, is on the horizon. The
Company's network architecture anticipates this evolution and avoids capital
investment that may prove technically and economically obsolete.
 
     Switch Hardware.  The Company's switching platform is the Nortel DMS 500.
MGC has executed a contract with Nortel providing for the purchase of 20 DMS 500
switches (two of which have already been delivered). The contract specifies
industry standard warranties. The DMS 500 system offers a flexible and cost
effective means of establishing a single point of presence in, and the ability
to provide revenue generating services to, both the local and long distance
markets. The DMS 500 combines the DMS 100 local switch functionality with long
distance toll and tandem switching capability.
 
     The Company's early-to-market strategy requires an accelerated switch
deployment schedule. Reducing the customization of the building to house the
switch is one method. With this in mind, the Company is pursuing a number of
alternative solutions including working with Nortel to supply it with a "switch
in a box." The switch would be installed at Nortel's factory in a series of
self-contained units, with all the necessary environmental, fire and other
elements pre-installed, which could be trucked to and inserted in a facility
through a standard eight foot door and be operational within a short period of
time. By using this approach or other modifications to traditional installation,
the Company believes it can move quickly to open new markets and be operational
in as short as four months from the date of site selection. The Company may
employ more than one switch in a particular market.
 
     Interconnection Agreements.  The Company has interconnection agreements
with Sprint for operation in Las Vegas (it expects to expand this agreement for
operations in Chicago), BellSouth for operation in Georgia, GTE in Southern
California, PacBell in California and Ameritech in Illinois. The Company
believes it has secured favorable agreements which will allow it to operate
profitably in these jurisdictions, but there can be no assurance to that effect.
The Company has authority to operate as a CLEC in Illinois, Georgia, Nevada and
California and has made application for such authority in Florida.
 
                                       40
<PAGE>   46
 
OPERATIONS
 
     Customer Service.  The Company strives to provide customer service superior
to the ILEC in each of its markets. This includes:
 
     - Personnel.  CSRs and sales personnel who are well trained and attentive
       to customers' needs. CSRs are available 24 hours a day, seven days a
       week, 365 days a year.
 
     - Phones.  Prioritizing the answering of phones such that calls are
       answered after a limited number of rings.
 
     - Coordination.  Coordinating the installation with both the customer and
       the ILEC, if involved.
 
     - Customer Information.  Keeping the customer informed if there is an
       installation or repair problem and dedicating the necessary resources to
       resolve the problem as soon as possible.
 
     - Billing.  Providing the customer a timely bill which is accurate, simple
       to read and understand and comprehensive.
 
     Centralization.  The Company has a centralized customer service center,
including a centralized call center, which operates seven days per week 24 hours
a day. Centralization allows the Company to control personnel and their training
to a greater degree than with call centers in each city and thereby provides
consistent, high quality customer service with lower overhead costs.
 
     Automation.  The Company believes automation of internal processes
contributes greatly to the overall success of a service provider and billing is
a critical element of any telephone company's operation. The Company's
management information system has been designed to allow a CSR to quickly take
all the necessary information from a customer in a logical, conversational
manner, establish the appropriate billing and credit information and
electronically process the order with the ILEC for the local loop. It creates
the correct emergency 911 address update for new customers and supplies the
information to the appropriate emergency authorities. Concurrently, it will
establish the related cost elements with the order to track the expense of the
facility leased from the ILEC.
 
     Thereafter, the system will track the progress of the order based on
electronic or facsimile updates from the ILEC. The installation desk will follow
the customer's order, ensuring the installation date is met. Additionally, CSRs
will be able to handle all other customer service inquiries, including billing
questions, repair calls or directory assistance information. All this
information is available in the integrated system available to the CSR.
 
     In addition, the Company's proprietary management information system has
been designed to track and bill all forms of local service, including line and
feature charges and long distance charges. Additionally, the billing system can
provide sophisticated solutions for business bills. Companies desiring a single
bill for many locations, summary bills only without detail or any other
combination can be accommodated. Lastly, the Company expects to be able to
deliver billing information in a number of media besides paper including
electronic files, Internet inquiry or on-line inquiry.
 
LOW COST FOCUS
 
     To offer service to its targeted segments of the market and insure long
term profitability, the Company has created a low cost structure and focus. The
key components of this strategy are:
 
          Low Cost Network Architecture.  One of the most critical elements of
     creating a low cost structure is a service provider's decision as to the
     type of network to build. MGC has chosen to exclusively build a
     switch-based network. MGC believes this is the lowest cost approach. To
     accomplish this, the Company has made the decision to lease the necessary
     transport and local loops on an incremental basis, as demand dictates, from
     ILECs and CAP/CLECs. As a result, the Company will not be burdened by the
     carrying cost of a constructed transport network. This approach allows the
     Company to precisely target its capital expenditures to the specifics of
     each market and developing conditions.
 
                                       41
<PAGE>   47
 
          Standardized Switch/Installation.  The Company plans to use only
     Nortel switches, all configured in the same manner and where possible
     delivered in a portable environment such as a container. The Company
     believes this approach will reduce the time to install its switches.
 
          Simple Product.  The Company's product offerings are based on basic
     telephone services. This simplified approach allows the Company to
     standardize training, order processing and interfaces with the different
     ILECs. The Company does not expect to offer complex telecommunications
     packages.
 
          Automation.  An important component in producing a low cost
     environment is automation of the processes involved. The Company has
     installed a proprietary management information system designed to be a
     comprehensive, integrated system that addresses all aspects of its
     business, including customer care and billing, general ledger, payroll,
     fixed asset management, purchasing and personnel. This system is scalable
     and has been designed to support the Company's operation as it grows.
 
   
          Credit Policy.  The Company's early lack of formal credit or deposit
     procedures resulted in an unacceptable level of uncollectible accounts and
     resulting bad debt. During third quarter 1997, a total of 2,471 lines were
     disconnected, the majority of which were terminated for non-payment. To
     minimize its bad debt exposure, the Company is implementing a policy
     generally requiring new customers to prepay for specified services and
     usage estimates. Receipt of the prepayment will generally be required prior
     to service being activated. Additional personnel have been dedicated to
     collections and credit monitoring to seek to reduce the Company's bad debt.
     The new credit policy is expected to allow the Company to maintain its
     focus on low cost delivery of basic telephone services.
    
 
          Efficient Customer Service.  The Company has a centralized customer
     service center, including a centralized call center, which operates seven
     days per week 24 hours per day. The centralized calling center handles all
     inquiries and orders for new service. This centralization allows the
     Company to control personnel and their training to a greater degree than
     with call centers in each city.
 
COMPETITION
 
     The Company believes the only significant switch-based competitor for its
targeted markets (small businesses and residential users in suburban areas of
large metropolitan markets) is the ILEC in each market. However, the CAP/CLECs
and other telecommunications suppliers in each of the metropolitan areas in
which the Company will be present could also elect to compete for the Company's
targeted market.
 
     General competition in each of the service categories provided by the
Company is discussed below.
 
     Local Services.  In each of its geographic markets, the Company faces
significant competition for the local services it offers from RBOCs and other
ILECs, which currently dominate their local telecommunications markets. These
companies all have long-standing relationships with their customers and have
financial, personnel and technical resources substantially greater than those of
MGC.
 
     The Company will also face competition in most markets in which it will
operate from one or more CAP/CLECs operating fiber optic networks. Other local
service providers have operations or are initiating operations within one or
more of the Company's service areas. MGC expects WorldCom, MCI, Teleport
Communications Group, Inc. ("Teleport"), and certain cable television providers,
all of which are substantially larger and have substantially greater financial
resources than the Company, to enter some or all of the markets the Company will
serve. MGC also understands other entities have indicated their desire to enter
the local exchange services market within specific metropolitan areas served or
targeted by MGC.
 
     In addition, a continuing trend toward consolidation and strategic
alliances within the telecommunications industry could result in significant new
competition for the Company. AT&T and MCI have begun to enter the local services
market. Other potential competitors of the Company include utility companies,
other long distance carriers and wireless telephone systems. The Company cannot
predict the number of competitors that will emerge as a result of existing or
new federal and state regulatory or legislative actions.
 
     Competition in all of the Company's market areas is based on quality,
reliability, customer service and responsiveness, service features and price.
The Company intends to keep its prices at levels below those of the ILECs while
providing, in the opinion of the Company, a higher level of service and
responsiveness to its customers.
 
                                       42
<PAGE>   48
 
     Although the ILECs are generally subject to greater pricing and regulatory
constraints than other local network service providers, ILECs are achieving
increasing pricing flexibility for their local services as a result of recent
legislative and regulatory developments. The ILECs have continued to lower
rates, resulting in downward pressure on prices for certain services.
 
     Long Distance Services.  The Company will compete with AT&T, MCI and others
in the long distance services market. Many of the Company's competitors have
long-standing relationships with their customers and have financial, personnel
and technical resources substantially greater than those of MGC. In providing
these services, the Company will focus on quality service and economy to
distinguish itself in a very competitive marketplace.
 
GOVERNMENT REGULATIONS
 
  Government Regulation and Requirements
 
     Overview.  The Company's services are subject to varying degrees of
federal, state and local regulation. The FCC exercises jurisdiction over all
facilities of, and services offered by, telecommunications common carriers such
as the Company, to the extent those facilities are used to provide, originate or
terminate interstate or international communications. The state regulatory
commissions retain jurisdiction over most of the same facilities and services to
the extent they are used to originate or terminate intrastate communications. In
addition, many of the regulations issued by these regulatory bodies may be
subject to judicial review, the result of which the Company is unable to
predict.
 
     Federal Regulation.  The Company must comply with the requirements of
common carriage under the Communications Act of 1934 (the "Communications Act"),
as amended. Comprehensive amendments to the Communications Act were made by the
Act, which was signed into law on February 8, 1996. The Act effected plenary
changes in regulation at both the federal and state levels that affect virtually
every segment of the telecommunications industry. The stated purpose of the Act
is to promote competition in all areas of telecommunications and to reduce
unnecessary regulation to the greatest extent possible. While it will take years
for the industry to feel the full impact of the Act, it is already clear the
legislation provides the Company with both opportunities and challenges.
 
     The Act gives the FCC the authority to forebear from regulating companies
if it finds such regulation does not serve the public interest, and directs the
FCC to review its regulations for continued relevance on a regular basis. As a
result of this directive, a number of the regulations that historically applied
to CLECs have been and may continue to be eliminated in the future. While it is
therefore expected that a number of regulations that were developed prior to the
Act will be eliminated in time, those which apply to the Company at present are
discussed below.
 
     The Act greatly expands the FCC's interconnection requirements on the
ILECs. The Act requires the ILECs to: (i) provide physical collocation, which
allows companies such as MGC and other interconnectors to install and maintain
their own network termination equipment in ILEC central offices, and virtual
collocation only if requested or if physical collocation is demonstrated to be
technically unfeasible; (ii) unbundle components of their local service networks
so other providers of local service can compete for a wider range of local
services customers; (iii) establish "wholesale" rates for their services to
promote resale by CLECs and other competitors; (iv) establish number
portability, which will allow a customer to retain its existing phone number if
it switches from the ILEC to a competitive local service provider; (v) establish
dialing parity, which ensures customers will not detect a quality difference in
dialing telephone numbers or accessing operators or emergency services; and (vi)
provide nondiscriminatory access to telephone poles, ducts, conduits and
rights-of-way. In addition, the Act requires ILECs to compensate competitive
carriers for traffic originated by the ILECs and terminated on the competitive
carrier's networks. The FCC is charged with establishing national guidelines to
implement the Act. The FCC issued its Interconnection Order on August 8, 1996,
which established detailed rules regarding rates, terms and conditions for
interconnection between CLECs and ILECs. The Interconnection Order was appealed
to the U.S. Court of Appeals for the
 
                                       43
<PAGE>   49
 
Eighth Circuit. On July 18, 1997, the Court issued a final decision vacating the
interconnection pricing rules and "most favored nation" rules as well as certain
other interconnection rules. It is expected that the Eighth Circuit decision
will be appealed to the United States Supreme Court, although it is not possible
at this time to determine how or when the Supreme Court will respond to these
appeals. MGC does not believe the Eighth Circuit decision will have any
significant impact on its operation. On October 14, 1997, the U.S. Court of
Appeals for the Eighth Circuit ruled that ILECs are under no obligation to
provide AT&T or anyone else with a rebundled package of individual network
elements. The Company believes that the impact of this ruling is neutral to the
Company in light of the Company's switch-based network strategy employing
unbundled network elements and may be beneficial in the short-term by delaying
entrance into the local service market by IXC's such as AT&T.
 
     On May 16, 1997, the FCC released an order that fundamentally restructured
the "access charges" ILECs charge to interexchange carriers and end user
customers. The Company's analysis of the FCC's order leads it to believe the
FCC's new access charge rules do not adversely affect the Company's business
plan, and they do in fact present significant opportunities for new entrants,
including the Company. Aspects of the order may be changed in the future. At
least ten parties have filed appeals with federal courts, and numerous parties
have asked the FCC to reconsider portions of its new rules.
 
     As part of its pro-competitive policies, the Act frees the RBOCs from the
judicial order that prohibited their provision of interLATA services.
Specifically, the Act permits RBOCs to provide long distance services outside
their local service regions immediately, and will permit them to provide
in-region interLATA service upon demonstrating to the FCC and state regulatory
agencies they have adhered to the FCC's interconnection regulations. As of
August 31, 1997, ILECs in two states have filed applications for in-region long
distance authority with the FCC -- Ameritech in Michigan and Southwestern Bell
in Oklahoma. The FCC recently denied Ameritech's application.
 
   
     On December 31, 1997, a federal judge in Dallas ruled key sections of the
Act unconstitutional on the grounds that RBDCs were unfairly denied access to
the long distance segment of the industry. This decision was immediately
appealed by numerous IXCs.
    
 
     As a result of provisions of the Act, the Company has taken the steps
necessary to be a provider of local exchange services. As of September 30, 1997,
MGC had obtained local certification in four states and had applications pending
for local certification in one additional state. In addition, the Company has
successfully negotiated interconnection agreements that meet the interconnection
provisions contained in the Act with five ILECs and is in negotiation for
interconnection agreements with four additional ILECs. At the same time, the Act
also makes competitive entry more attractive to RBOCs, other ILECs and
interexchange carriers and other companies, and likely will increase the level
of competition the Company faces.
 
     The Act's interconnection requirements also apply to interexchange carriers
and all other providers of telecommunications services, although the terms and
conditions for interconnection provided by these carriers are not regulated as
strictly as interconnection provided by the ILECs. This may provide the Company
with the ability to reduce its own access costs by interconnecting directly with
non-ILECs, but may also cause the Company to incur additional administrative and
regulatory expenses in replying to interconnection requests.
 
     While the Act reduces regulation to which non-dominant local exchange
carriers are subject, it also reduces the level of regulation that applies to
the ILECs, and increases their ability to respond quickly to competition from
the Company and others. For example, in accordance with the Act, the FCC has
applied "streamlined" tariff regulation to the ILECs, which greatly accelerates
the time required for changes to tariffed service rates to take effect, and
eliminates the requirement that ILECs obtain FCC authorization before
constructing new domestic facilities. These actions will allow ILECs to change
service rates more quickly in response to competition. Similarly, the FCC is
expected to release an order later this year that may provide significant new
pricing flexibility to ILECs. To the extent such increased pricing flexibility
is provided, the Company's ability to compete with ILECs for certain service may
be adversely affected.
 
     On May 8, 1997, in compliance with the requirements of the Act, the FCC
released an order establishing a new Universal Service support fund, which
provide subsidies to carriers that provide service to under-served
 
                                       44
<PAGE>   50
 
individuals and customers in high cost areas, and to companies that provide
telecommunications services and wiring for schools and libraries. The Company is
required to contribute into the Universal Service fund, but may also obtain
subsidies for services it provides. The new Universal Service rules will be
administered jointly by the FCC and state regulatory authorities, many of which
are still in the process of establishing their administrative rules. The net
revenue effect of these regulations on the Company cannot be determined at this
time.
 
  State Regulation
 
     The Company has received CLEC certification in Nevada, Georgia, Illinois
and California and is in the process of applying for certification in Florida.
State authorizations vary in their regulatory intensity. State laws and
regulations that prohibit or have the effect of prohibiting, local and
long-distance telecommunications competition may be preempted under the Act.
 
     In most states, the Company is required to file tariffs setting forth the
terms, conditions, and prices for services which are classified as intrastate.
In some states, the Company's tariff can list a range of prices for particular
services, and in others, such prices can be set on an individual customer basis.
The Company is not at this time subject to price cap or to rate of return
regulation in Nevada or any of its planned expansion markets.
 
     Under the Act, implementation of the Company's plans to compete in local
markets is and will continue to be, to a certain extent, controlled by the
individual states. The Company continues to support efforts at the state
government level to more quickly implement competition in their markets under
the new federal law and to permit CAPs/CLECs to operate on the same basis and
with the same rights as the ILECs, sometimes referred to as "co-carrier status."
Currently, a number of state regulatory agencies have authorized varying degrees
of co-carrier privileges to new competitors. As of January 1, 1996, over
one-half of the states have taken regulatory and legislative action to open
local communications markets to various degrees of local exchange competition
and co-carrier status, including the five states in which the Company operates
or currently plans to operate (California, Illinois, Georgia, Massachusetts, and
Nevada).
 
     Since early 1995, several CAPs/CLECs have entered into co-carrier
agreements with ILECs which address CLEC/ILEC interconnection issues, such as
reciprocal compensation and number portability. While the Act mandates the
implementation of interconnection arrangements, there can be no assurance such
negotiations will enable the Company to secure its desired co-carrier
arrangements in a timely fashion or upon reasonable rates and terms.
 
PROPERTIES
 
   
     In Las Vegas, the Company has a five year lease with a five year option for
the 8,000 square feet housing its switch site. The Company has entered into an
agreement to lease 24,125 square feet of additional space to house the Company's
corporate headquarters, national customer service operations, national sales
personnel, Las Vegas sales personnel and general administration. This building
is owned by two of the Company's principal stockholders and directors, Maurice
J. Gallagher, Jr. and Timothy P. Flynn. See "Certain Transactions." Management
believes the terms and conditions of this transaction are equal to or better
than market rates. Additionally, Messrs. Gallagher and Flynn have agreed to work
with the Company to construct additional facilities when needed. The Company
leases two other offices in the Las Vegas area under short term leases. These
offices house the Company's general office space and customer service personnel
and will be vacated when the new facility is ready for occupancy.
    
 
     The Company has entered into a lease for its Atlanta switch site in the
suburb of Toco Hills. The Company has a ten year lease with two five year
options for 6,400 square feet. This site has sufficient space for the Company's
switch and adequate office space to house its local sales staff and
administrative support.
 
     The Company purchased a 3,800 square foot facility for $260,000 in Pomona,
California to house its switch and technical staff.
 
                                       45
<PAGE>   51
 
     The Company places great importance on each switch facility and seeks to
insure maximum security and environmental control. MGC believes this can be
achieved through standalone structures. This approach minimizes the risk of fire
or other hazards from adjacent tenants or properties.
 
PERSONNEL
 
     As of September 30, 1997, there were 111 employees of the Company, the
majority of whom were located in Las Vegas. The Company expects to substantially
increase its employee count over the next two years.
 
     MGC has non-disclosure and non-compete agreements with all of its executive
employees. None of MGC's employees is represented by a collective bargaining
agreement.
 
LEGAL PROCEEDINGS
 
     The Company is not a party to any pending legal proceedings of a material
nature.
 
                                       46
<PAGE>   52
 
                                   MANAGEMENT
 
     The following table sets forth, as of September 30, 1997, the name, age and
position within the Company of each executive officer and director of the
Company. Their respective backgrounds are described following the table.
 
<TABLE>
<CAPTION>
                NAME                   AGE                    POSITION
                ----                   ---                    --------
<S>                                    <C>    <C>
Nield J. Montgomery..................  53     Chief Executive Officer, President,
                                              Director
Maurice J. Gallagher, Jr. ...........  48     Chairman of the Board of Directors
Mitchell Allee.......................  56     Vice President -- Information Technology,
                                                Chief Information Officer
John Boersma.........................  37     Vice President -- Operations
Michael E. Burke.....................  53     Vice President -- Engineering and
                                                Operations
Michael D. English...................  50     President -- Eastern Region
Timothy P. Flynn.....................  47     Director
Jack Hancock.........................  67     Director
Kent F. Heyman.......................  42     Vice President and General Counsel
Thomas G. Keough.....................  53     Vice President -- Sales and Marketing
Linda M. Sunbury.....................  36     Vice President -- Administration
Mark W. Peterson.....................  43     President -- Western Region
David A. Rahm .......................  43     Vice President -- Network Development
</TABLE>
 
     NIELD J. MONTGOMERY has been the Chief Executive Officer and President and
a member of the Board of Directors of the Company since he participated in its
founding. Mr. Montgomery has over 34 years of telephone experience, most
recently serving as General Manager -- Switch Implementation for ICG from April
1994 to June 1995. In that capacity, he was responsible for developing strategy
and deploying telephone switches nationally to position it to enter the local
phone service business. Prior to that, Mr. Montgomery served as General
Marketing and Sales Manager for Sprint/Centel (successor to Centel Nevada)
("Centel"). During his 13 year Centel career from 1989 to 1993, he served in
senior executive positions directing engineering, operations, business office,
sales, and marketing functions. Before joining Centel, Mr. Montgomery held a
variety of management positions with NYNEX from 1969 to 1980.
 
   
     MAURICE J. GALLAGHER, JR. has served as the Chairman of the Board of
Directors since its founding. Mr. Gallagher was instrumental in organizing the
Company with Mr. Montgomery. Mr. Gallagher was a founder of ValuJet in 1993 and
served as a Director of ValuJet from 1993 until November 1997. Mr. Gallagher
also held prior positions (President and Chief Financial Officer) with ValuJet
from 1993 to 1994 and served as Vice Chairman from 1994 to 1997. Prior to
ValuJet, Mr. Gallagher was a founder and President of WestAir Holding, Inc.
("WestAir"), a commuter airline headquartered in Fresno, California. WestAir was
sold to Mesa Airlines ("Mesa") in June 1992. Mr. Gallagher was a member of the
Mesa Board of Directors from June 1992 through March 1993 and served as a
director of Submicron Systems, Inc. from April 1997 until November 1997.
    
 
     MITCHELL ALLEE has served as Vice President -- Information Technology and
Chief Information Officer of the Company since July 1997. Although Mr. Allee is
expected to devote the majority of his time to the Company, pursuant to an
independent contractor agreement, he will continue to direct CMS Solutions
("CMS"), a company which he owns and serves as president. Since its founding in
1985, CMS has been a software development company specializing in high volume
financial transaction software. CMS clients have ranged from the smallest Public
Utility District in California to Unocal Corporation where CMS developed a
nationwide chemical distribution and accounting system. CMS also developed a
ticketless reservation system for ValuJet.
 
     JOHN BOERSMA has served as Vice President -- Operations of the Company
since May 1997. He served as Vice President of Carrier Relations for ICG Telecom
Group, Inc. ("ICG Telecom") from 1996 to 1997. He was responsible for ICG
Telecom's relationship with local exchange carriers and implementation, purchase
agreements and service quality and served as Vice President, Northern California
Operations from April 1994
 
                                       47
<PAGE>   53
 
to September 1996. He joined Bay Area Transport, now a part of ICG Telecom, in
1986 and held various positions having responsibility for overall financial and
operational performance, marketing management, new business development,
regulatory affairs, and information systems development. He served on the CLEC
Industry Board of Directors and served as the chairman of the association's
Tariff Committee from 1991 until 1993.
 
     MICHAEL E. BURKE has served as Vice President -- Engineering and Operations
of the Company since 1996. Mr. Burke has over 27 years of engineering and
engineering project management experience in the telecommunications industry,
and served from 1990 to 1995 as a member of the Board of Directors and as Vice
President -- Network Design for Contel of California. Mr. Burke also served in
various engineering management roles with Continental Telephone Company (from
1971 to 1995), California Pacific Utilities (from 1970 to 1971), and General
Telephone Company of California (from 1963 to 1970).
 
     MICHAEL D. ENGLISH has served as President -- Eastern Region of the Company
since 1996. Mr. English has over 23 years of telephone industry experience,
serving from 1993 to 1996 as Vice President at Metro Access Networks. Prior to
joining Metro Access Networks, Mr. English served in 1993 as a consultant to
Time Warner Communications. Mr. English was President and Chief Executive
Officer at Virginia MetroTEL from 1993 to 1994, and served during 1992 as Vice
President at FiberCom, a subsidiary of BTI. From 1988 to 1992, Mr. English
served as President and Chairman of FiberLan, Inc. ("FiberLan"), a subsidiary of
BellSouth and Siecor. He joined FiberLan in 1985 as Vice President. Mr. English
also previously served in senior management positions in strategic planning and
switch engineering at BellSouth (from 1984 to 1985), AT&T (from 1978 to 1981),
and Southern Bell (from 1973 to 1978 and 1981 to 1983).
 
   
     TIMOTHY P. FLYNN has served as Member of the Board of Directors of the
Company since 1996. Mr. Flynn served as a member of the Board of Directors of
ValuJet since he participated in its founding in 1993 until November 1997. Prior
to ValuJet, Mr. Flynn was Chairman of the Board and CEO of WestAir. He and Mr.
Gallagher purchased WestAir Airlines in 1983 and operated it through June 1992
when it was sold to Mesa. Mr. Flynn was a member of the Board of Directors of
Mesa from June 1992 through March 1993. Mr. Flynn and Mr. Gallagher are
affiliated in a number of other transactions.
    
 
     JACK L. HANCOCK has served as a Member of the Board of Directors of the
Company since 1996. Mr. Hancock was Vice President of Systems Technology and
Executive Vice President, Product and Technology for PacBell (from 1988 to
1993). Prior to joining PacBell, Mr. Hancock was Executive Vice President for
Information Systems, Strategic Planning, and Human Resources at Wells Fargo Bank
(from 1982 to 1987). Before that, he was Senior Vice President for Management
Information Systems at Chemical Bank (from 1978 to 1981). He is a member of the
Boards of Directors of several public and private companies, including Union
Bank of California (from 1994 to present) and Wittaker Corporation (from 1994 to
present).
 
     KENT F. HEYMAN has served as Vice President and General Counsel of the
Company since June 1996. Mr. Heyman has 17 years of legal experience, most
recently as chairman of the litigation department and Senior Trial Counsel of
the Dowling, Magarian, Aaron & Heyman Law Firm. Mr. Heyman has served as a
California Superior Court Judge pro tempore presiding over trial, settlement
conference and other proceedings from 1990 to 1996.
 
     THOMAS G. KEOUGH has served as Vice President -- Sales and Marketing of the
Company since December 1996 and is responsible for all marketing and sales, and
customer service activities. He has over 20 years experience as a marketing and
sales executive, serving most recently as Executive Vice President and Director
of Sales for Jetstream Aircraft, a subsidiary of British Aerospace from 1992 to
1996. Mr. Keough also served in senior marketing and sales management roles with
Beech Aircraft (from 1989 to 1992), Bombardier (from 1988 to 1989), Saab
Aircraft of America (from 1983 to 1988), and DeHavilland (from 1976 to 1983).
 
     LINDA M. SUNBURY has served as Vice President -- Administration of the
Company since June 1996. Ms. Sunbury has over 12 years accounting and
administrative experience, having held similar positions in the airline
industry. Most recently, Ms. Sunbury was Vice President of Administration for
Business Express, Inc. ("Business Express") dba the Delta Connection from 1994
to 1996. While Ms. Sunbury was at Business
 
                                       48
<PAGE>   54
 
Express, creditors of Business Express filed an involuntary petition for
bankruptcy in January 1996. Business Express subsequently reorganized and
emerged from bankruptcy in April 1997. Prior to that, Ms. Sunbury served as
Controller for West Air Commuter Airlines, Inc. dba United Express from 1988 to
1994. Ms. Sunbury began her career with the accounting firm of KPMG Peat Marwick
LLP where she was employed from 1983 to 1988.
 
     MARK W. PETERSON has served as President -- Western Region of the Company
since March 1997. He previously served as head of corporate affairs for both
WestAir Airlines, dba United Express in Fresno, California from 1988 to 1992 and
for AirCal Airlines in Newport Beach, California from 1978 to 1982. He also
served as a marketing communications manager with Bank of America in San
Francisco, worked as marketing consultant in Northern California from 1985 to
1986, and was an instructor in business communications at California State
University, Chico.
 
     DAVID A. RAHM has served as Vice President of Network Development of the
Company since May 1996. Mr. Rahm served as general counsel of Chadmoore Wireless
Group, Inc. from 1995 to 1996. Prior to that, Mr. Rahm served as Director of
Administration, Acting Director of Production and General Counsel of Sigma Game,
Inc. from 1993 to 1994. Mr. Rahm also served as Assistant Vice President,
Manager of Marketing, Credit, Leasing and Administration for Lodgistix, Inc.
from 1980 to 1990.
 
   
     The holders of the Preferred Stock have the right to select two members of
the Board of Directors, but such persons have yet to be designated.
    
 
SUMMARY OF CASH AND CERTAIN OTHER COMPENSATION
 
     The following table shows, for the fiscal year ended December 31, 1996, the
cash compensation paid by the Company, as well as certain other compensation
paid or accrued for such year, for the Company's Chief Executive Officer. No
Executive Officer received compensation in excess of $100,000 in 1996. No
compensation was paid to any Executive Officers of the Company prior to April 1,
1996.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                     LONG TERM
                                                ANNUAL COMPENSATION             COMPENSATION AWARDS
                                          --------------------------------   -------------------------
                                                              OTHER ANNUAL
                                                              COMPENSATION               ALL OTHER
      NAME AND PRINCIPAL POSITION         YEAR     SALARY        BONUS       OPTIONS    COMPENSATION
      ---------------------------         ----    ---------   ------------   -------  ----------------
<S>                                       <C>     <C>         <C>            <C>      <C>
Nield J. Montgomery.....................  1996     $45,077(1)        --      600,000           --
  President and Chief Executive Officer
</TABLE>
 
- ---------------
(1) $2,000 of such compensation was paid in April 1996, prior to the
    commencement of the Company's operations, in the form of 800,000 shares of
    Common Stock in the Company.
 
     The following table shows the names and current annual compensation levels
of the Chief Executive Officer and the four most highly compensated Executive
Officers based upon a full year of employment.
 
<TABLE>
<CAPTION>
NAME AND PRINCIPAL POSITION                                    SALARY
- ---------------------------                                   --------
<S>                                                           <C>
Nield J. Montgomery.........................................  $150,000
  President and Chief Executive Officer
Thomas G. Keough............................................   110,000
  Vice President -- Sales & Marketing
John Boersma................................................   105,000
  Vice President -- Operations
Michael E. Burke............................................   100,000
  Vice President -- Engineering & Operations
Michael D. English..........................................   100,000
  President -- Eastern Region
</TABLE>
 
                                       49
<PAGE>   55
 
EMPLOYMENT AND STOCK PURCHASE/REPURCHASE AGREEMENTS
 
     Nield J. Montgomery.  The Company's employment agreement with Mr.
Montgomery provides for a base salary of $150,000 per year, effective September
1, 1997, and discretionary bonuses. Prior to the commencement of revenue
producing operations in December 1996, Mr. Montgomery's base salary was $5,000
per month. Mr. Montgomery is required to devote his full time and efforts to the
business of the Company during the term of his employment agreement which
expires in September 2000. Mr. Montgomery's employment may be terminated by
either the Company or Mr. Montgomery at any time. Mr. Montgomery has agreed not
to participate in a business offering local, long distance and related telephone
services during the term of his employment and for a period of 18 months
following termination. If Mr. Montgomery's employment is terminated by the
Company without cause, he will be entitled to severance pay of $150,000 payable
over a period of 12 months. Under the terms of Mr. Montgomery's employment
agreement, the other stockholders have certain rights to repurchase a portion of
Mr. Montgomery's stock in the Company if his employment is terminated on or
before April 1, 2001.
 
     John Boersma.  The Company's employment agreement with Mr. Boersma provides
for a base salary of $105,000 per year and a bonus of up to 50% of his base
salary based on his and the Company's performance. Mr. Boersma's employment may
be terminated at any time during its term by either the Company or Mr. Boersma.
Mr. Boersma has agreed not to participate in a business offering local, long
distance and related telephone services in the State of Nevada during the term
of his employment and for a period of six months following termination. In
addition, Mr. Boersma has exercised certain rights to acquire 50,000 shares of
Common Stock at $2.00 per share and an additional 100,000 shares of Common Stock
at $2.50 per share. Such shares are subject to repurchase at their cost if Mr.
Boersma's employment with the Company is terminated prior to May 19, 2000. The
Company has agreed to finance over a period of three years the purchase price of
the shares purchased at $2.50 per share.
 
     Mitchell Allee.  Mitchell Allee has exercised certain rights to acquire
200,000 shares of Common Stock at $2.00 per share and an additional 175,000
shares of Common Stock at $2.50 per share. The Company has agreed to finance
over a period of three years the purchase price of the shares purchased at $2.50
per share. A prorated portion of such shares is subject to repurchase at their
cost if Mr. Allee's engagement with the Company is terminated (other than as a
result of his death or disability) prior to June 2000.
 
STOCK OPTION PLAN
 
     The Company has adopted the NevTEL, Inc. Stock Option Plan (the "Plan"). A
total of 2,400,000 shares of Common Stock are reserved for issuance under the
Plan. As of September 30, 1997, options to purchase 1,739,600 shares have been
granted under the Plan. No options issued under the Plan have been exercised and
as of September 30, 1997, options to purchase 56,000 shares have lapsed. At such
date, options to purchase 1,683,600 shares were outstanding under the Plan at an
average exercise price of $1.52 per share and options for up to 716,400
additional shares may be granted under the Plan.
 
     Options granted under the Plan may be either incentive stock options or
nonqualified options.
 
     The Plan contemplates that options may be granted to directors, key
employees and consultants of the Company. The exercise price of the options
granted under the Plan will be determined by the Company's Board of Directors or
by the Compensation Committee of the Board of Directors. The terms of the
options and the dates after which they become exercisable are established by the
Compensation Committee or the Board of Directors, subject to the terms of the
Plan. Options granted under the Plan generally vest over a five year period.
 
     The Company has from time to time granted stock options under the Plan in
order to provide certain officers, directors, employees and consultants with a
competitive total compensation package and to reward them for their contribution
to the Company's performance. These grants of stock options are designed to
align the individual's interest with that of the Stockholders of the Company.
 
                                       50
<PAGE>   56
 
BONUS PLAN
 
     The Company's Bonus Plan is predicated on established EBITDA targets and
individual goals and achievements of key corporate personnel.
 
OPTION GRANTS IN LAST FISCAL YEAR
 
     The table below sets forth information regarding all stock options granted
in the 1996 fiscal year under the Company's Plan to the Chief Executive Officer
of the Company named in the Compensation Table above:
 
<TABLE>
<CAPTION>
                                           % OF                                                 POTENTIAL REALIZED
                                          TOTAL                   MARKET                             VALUE AT
                            NUMBER OF    OPTIONS                  PRICE                        ASSUMED ANNUAL RATES
                            SECURITIES  GRANTED TO               OR FAIR                          OF STOCK PRICE
                            UNDERLYING  EMPLOYEES                 VALUE                          APPRECIATION (1)
                             OPTIONS    IN FISCAL    EXERCISE    ON DATE                       --------------------
                             GRANTED       YEAR       PRICE      OF GRANT    EXPIRATION DATE      5%         10%
                            ----------  ----------   --------   ----------   ----------------  ---------  ---------
<S>                         <C>         <C>          <C>        <C>          <C>               <C>        <C>
Nield J. Montgomery.......     600,000      70%       $0.50       $0.25       April 1, 2006       --        $89,061
</TABLE>
 
- ---------------
(1) The dollar amounts under these columns are the result of calculations at the
    5% and 10% rates set by the Securities and Exchange Commission and therefore
    are not intended to forecast possible future appreciation, if any, of the
    price of the Company's Common Stock.
 
AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR END OPTION
VALUES
 
     The following table shows aggregate exercises of options during 1996 and
the values of options held by the Company's Chief Executive Officer as of
December 31, 1996.
 
<TABLE>
<CAPTION>
                                                                                      VALUE OF UNEXERCISED
                                                                   NUMBER OF          IN-THE-MONEY OPTIONS
                                                              UNEXERCISED OPTIONS      DECEMBER 31, 1996
                              SHARES ACQUIRED     VALUE        DECEMBER 31, 1996              (1)
NAME                            ON EXERCISE      REALIZED       (UNEXERCISABLE)         (UNEXERCISABLE)
- ----                          ---------------    --------    ---------------------    --------------------
<S>                           <C>                <C>         <C>                      <C>
Nield J. Montgomery.........        --             --                 600,000               $900,000
</TABLE>
 
- ---------------
(1) Based upon a value for the Company's Common Stock on December 31, 1996,
    estimated for these purposes to be $2.00 per share.
 
DIRECTOR COMPENSATION
 
   
     The Company's outside Directors receive meeting fees of $500 per meeting of
the Board of Directors or committees of the Board of Directors attended in
person in addition to reimbursement of their expenses in attending meetings of
the Board of Directors.
    
 
                                       51
<PAGE>   57
 
                             PRINCIPAL STOCKHOLDERS
 
SECURITY OWNERSHIP OF MANAGEMENT AND CERTAIN BENEFICIAL OWNERS
 
   
     The following table sets forth, as of November 30, 1997, certain
information with respect to the Company's Common Stock owned beneficially by
each director, by all Executive Officers and directors as a group and by each
person known by the Company to be a beneficial owner of more than 5% of the
outstanding Common Stock of the Company. Except as noted in the footnotes, each
of the persons listed has sole investment and voting power with respect to the
shares of Common Stock included in the table.
    
 
   
<TABLE>
<CAPTION>
                                                          NUMBER OF SHARES      PERCENT OF
               NAME OF BENEFICIAL OWNER                  BENEFICIALLY OWNED    OWNERSHIP(1)
               ------------------------                  ------------------    ------------
<S>                                                      <C>                   <C>
Maurice J. Gallagher, Jr.(2)(3)........................      5,245,000             26.4%
Timothy P. Flynn(2)(4).................................      1,441,500              7.3%
Robert L. and Carol A. Priddy(2)(5)....................      1,437,500              7.2%
JK&B Management, L.L.C.(6).............................      1,428,572              7.2%
David Kronfeld(6)......................................      1,428,572              7.2%
Nield J. Montgomery(7).................................      1,380,000              6.9%
Circle F Ventures, LLC(8)..............................      1,250,000              6.3%
Thomas Neustaetter(9)..................................      1,142,857              5.8%
Wind Point Partners III, L.P.(10)......................      1,142,857              5.8%
Jack L. Hancock(11)....................................         54,000            *
All Executive Officers and Directors as a Group (13
  persons)(2)(3)(4)(7)(11)(12).........................      9,495,000             47.2%
</TABLE>
    
 
- ---------------
  *  Less than 1% of total.
 
   
 (1) The percent of outstanding Common Stock owned is determined by assuming the
     conversion of all outstanding Preferred Stock and by assuming that in each
     case the person only, or group only, exercised his or its rights to
     purchase all shares of Common Stock underlying presently exercisable stock
     options.
    
 
 (2) Includes presently exercisable warrants issued as a commitment fee in
     connection with the Common Stock Commitment. See "Certain Transactions."
 
   
 (3) Includes options to purchase 20,000 shares of Common Stock which are
     presently exercisable and 5,187,500 shares of Common Stock owned by the
     various partnerships or trusts with respect to which Mr. Gallagher is a
     general partner and/or beneficiary. Mr. Gallagher's address is 3301 N.
     Buffalo Drive, Las Vegas, Nevada 89129.
    
 
 (4) Includes options to purchase 4,000 shares which are presently exercisable.
     Mr. Flynn's address is 6900 Westcliff Drive, Suite 505, Las Vegas, Nevada
     89128.
 
 (5) The Priddys' address is 9410 Laguna Niguel Drive, Las Vegas, Nevada 89134.
 
   
 (6) Includes 957,143 shares of Series A Preferred Stock owned by JK&B Capital,
     L.P. ("JK&B") and 471,429 shares of Series A Preferred Stock owned by JK&B
     Capital II, L.P. ("JK&BII"), which Preferred Stock is convertible into
     Common Stock on a one for one basis. JK&B Capital Management, L.L.C.
     ("JK&BCM") is the general partner of JK&B and JK&BII. David Kronfeld is the
     manager of JK&BCM. The address of these beneficial owners is c/o JK&B
     Capital Management, L.L.C., 205 North Michigan, Suite 808, Chicago,
     Illinois 60601.
    
 
   
 (7) Includes options to purchase 120,000 shares which are presently
     exercisable. Mr. Montgomery's address is 3301 N. Buffalo Drive, Las Vegas,
     Nevada 89129.
    
 
   
 (8) Includes 250,000 shares owned by Hayden R. Fleming, the managing member of
     Circle F Ventures, LLC. Mr. Fleming has voting and dispositive power over
     the shares of Common Stock owned by Circle F Ventures, LLC. The address of
     Hayden R. Fleming and Circle F Ventures, LLC is 14988 N. 78th Way,
     Scottsdale, Arizona 85260.
    
 
   
 (9) Includes 571,429 shares of Series A Preferred Stock owned by Strategic
     Investment Partners Limited ("SIP"), 357,142 shares of Series A Preferred
     Stock owned by S-C Phoenix Holdings, L.L.C. ("SC"),
    
 
                                       52
<PAGE>   58
 
   
     142,857 shares of Series A Preferred Stock owned by Winston Partners II LDC
     ("Winston LDC") and 71,429 shares of Series A Preferred Stock owned by
     Winston Partners II LLC ("Winston LLC"), entities associated with
     Chatterjee Management Company. The Preferred Stock is convertible into
     Common Stock on a one for one basis. Mr. Neustaetter is an officer of
     Chatterjee Management Company. Mr. Neustaetter disclaims beneficial
     ownership of these shares over which he does not exercise investment or
     voting power. Mr. Neustaetter's address is c/o Chatterjee Management
     Company, 888 Seventh Avenue, New York, New York 10106.
    
 
   
(10) Includes 1,142,857 shares of Series A Preferred Stock which is convertible
     into Common Stock on a one for one basis. Wind Point Partners III, L.P.
     ("WPIII") is a private equity investment limited partnership, for which
     Wind Point Investors, L.L.C. ("WPI") is the general partner. Decisions with
     respect to investment and voting of shares by WPI are made by a committee
     of managing directors. WPI expressly disclaims beneficial ownership of
     shares owned by WPIII. The address of this beneficial owner is 676 N.
     Michigan Avenue, Suite 3300, Chicago, Illinois 60611.
    
 
   
(11) Includes options to purchase 4,000 shares which are presently exercisable.
    
 
   
(12) Includes options to purchase 42,000 shares owned by Executive Officers not
     named above which are presently exercisable.
    
 
                                       53
<PAGE>   59
 
                              CERTAIN TRANSACTIONS
 
   
     The Company has entered into an agreement to lease 24,125 square feet of
office space from two of the Company's directors and principal stockholders,
Maurice J. Gallagher, Jr. and Timothy P. Flynn. The rental rate is $1.65 per
square foot which includes common area maintenance charges of $.20 per square
foot. Management believes that the terms and conditions of this lease
arrangement are at least as favorable to the Company as those which the Company
could have received from an unaffiliated third party.
    
 
     The Company has entered into an agreement with Palms Centre Drive, Inc.
("PCDI"), a company owned and operated by Mitchell Allee, an officer and
stockholder of the Company, to provide, support and maintain the Company's
proprietary management information computer system. The agreement provides that
PCDI shall design and install the system at a cost of $600,000 payable in
monthly installments of $100,000 per month beginning July 1, 1997. Management
believes that the terms of the agreement with PCDI are at competitive prices and
terms.
 
   
     Certain persons have deposited an aggregate of $15.0 million in escrow (the
"Common Stock Commitment"), which funds were to have been applied to the
purchase of shares of Common Stock in the event the Preferred Stock Offering was
not closed within 60 days after the Issue Date. Since the Preferred Stock
Offering closed within that time period, the investors received a return of
their funds contributed in escrow. As a commitment fee for the Common Stock
Commitment, the Company has issued to all such persons contributing to the
escrow funds warrants to purchase an aggregate of 150,000 shares of Common Stock
at $.01 per share. Such warrants will be exercisable at any time prior to
October 1, 2004.
    
 
   
     A significant portion of the Common Stock Commitment has been provided by
the following Directors and more than 5% stockholders of the Company: Maurice J.
Gallagher, Jr. -- $3.75 million, Timothy P. Flynn -- $3.75 million and Robert L.
Priddy -- $3.75 million. As a commitment fee for their Common Stock Commitment,
such persons received warrants to purchase shares of Common Stock at $.01 per
share as follows: Gallagher -- 37,500 shares, Flynn -- 37,500 shares and
Priddy -- 37,500 shares.
    
 
                                       54
<PAGE>   60
 
                       DESCRIPTION OF THE EXCHANGE NOTES
 
GENERAL
 
     The Outstanding Notes were issued under an Indenture dated as of September
29, 1997 (the "Indenture") between the Company and Marine Midland Bank, trustee
(the "Trustee"). The Exchange Notes will also be issued under the Indenture, and
the Indenture will be qualified under the Trust Indenture Act of 1939, as
amended (the "Trust Indenture Act") upon the effectiveness of the Registration
Statement of which this Prospectus is a part. The form and terms of the Exchange
Notes will be same as the Outstanding Notes, except that the issuance of the
Exchange Notes has been registered under the Securities Act and thus the
Exchange Notes will not bear legends restricting their transferability. The
Exchange Notes will evidence the same indebtedness as the Outstanding Notes,
will be entitled to the benefits of the Indenture, and will be treated as a
single class under the Indenture with any Outstanding Notes. The Exchange Notes
and Outstanding Notes will be considered collectively to be a single class for
all purposes of this "Description of the Exchange Notes" (except under the
caption "-- Registration Rights; Liquidated Damages"), and all references herein
to "Notes" shall be deemed to refer collectively to the Outstanding Notes and
any Exchange Notes, unless the context otherwise requires.
 
     The definitions of certain terms used in the following summary are set
forth below under "-- Certain Definitions." As of the date of this Prospectus,
the Company has no subsidiaries. However, under certain circumstances, the
Company will be able to designate future Subsidiaries as Unrestricted
Subsidiaries. Unrestricted Subsidiaries will not be subject to many of the
restrictive covenants set forth in the Indenture. As used in this section, the
term "Company" refers only to MGC Communications, Inc. and not to its
Subsidiaries.
 
RANKING
 
     The Notes will rank senior in right of payment to all subordinated
Indebtedness of the Company. The Notes will rank pari passu in right of payment
with all existing and future senior borrowings, including borrowings under the
Credit Facility, except with respect to the assets securing the Notes. Holders
of other secured Indebtedness of the Company will, however, have claims that are
prior to the claims of the holders of the Notes with respect to the assets
securing such other Indebtedness.
 
   
     Certain of the Company's operations may in the future be conducted through
its Subsidiaries and, therefore, the Company may become dependent upon the cash
flow of its Subsidiaries to meet its obligations, including its obligations
under the Notes. The Notes will be effectively subordinated to all indebtedness
and other liabilities and commitments (including trade payables and lease
obligations) of the Company's Subsidiaries. Any right of the Company to receive
assets of any of its Subsidiaries upon the latter's liquidation or
reorganization (and the consequent right of the holders of the Notes to
participate in those assets) will be effectively subordinated to the claims of
that Subsidiary's creditors, except to the extent that the Company is itself
recognized as a creditor of such Subsidiary, in which case the claims of the
Company would still be subordinate to any security in the assets of such
Subsidiary and any indebtedness of such Subsidiary senior to that held by the
Company. As of September 30, 1997, the total amount of outstanding debt of the
Company, including the Notes, was approximately $155.7 million. The Notes have
been recorded at $155.0 million to recognize that a portion of the proceeds from
the issuance of the Notes has been allocated to the value of the warrants issued
to the purchasers of the Notes.
    
 
PRINCIPAL, MATURITY AND INTEREST
 
     The Notes are limited in aggregate principal amount to $160.0 million and
will mature on October 1, 2004. Interest on the Notes will accrue at 13% per
annum and will be payable semi-annually in arrears on April 1 and October 1 of
each year, commencing on April 1, 1998, to holders of record on the immediately
preceding March 15 and September 15. Interest on the Notes will accrue from the
most recent date to which interest has been paid or, if no interest has been
paid, from the Issue Date. Interest will be computed on the
 
                                       55
<PAGE>   61
 
basis of a 360-day year comprised of twelve 30-day months. The Notes will be
issued in registered form, without coupons, and in denominations of $1,000 and
integral multiples thereof.
 
OPTIONAL REDEMPTION
 
     The Notes will not be redeemable at the Company's option prior to October
1, 2001. Thereafter, the Notes will be subject to redemption at the option of
the Company, in whole or in part, upon not less than 30 nor more than 60 days'
notice, at the redemption prices (expressed as percentages of principal amount)
set forth below plus accrued and unpaid interest and Liquidated Damages, if any,
thereon to the applicable redemption date, if redeemed during the twelve-month
period beginning on October 1 of the years indicated below:
 
<TABLE>
<CAPTION>
YEAR                                                          PERCENTAGE
- ----                                                          ----------
<S>                                                           <C>
2001........................................................    106.50%
2002........................................................    103.25%
2003 and thereafter.........................................    100.00%
</TABLE>
 
     Notwithstanding the foregoing, in the event of the sale by the Company
prior to October 1, 2000 of its Capital Stock (other than Disqualified Stock) in
one or more Equity Offerings, up to a maximum of 35% of the aggregate principal
amount of the Notes originally issued will, at the option of the Company, be
redeemable from the net cash proceeds of one or more Equity Offerings (but only
to the extent the proceeds of such Equity Offering consist of cash or readily
marketable cash equivalents) at a redemption price equal to 113% of the
principal amount thereof plus accrued and unpaid interest and Liquidated
Damages, if any, thereon to the redemption date, provided that at least 65% of
the aggregate principal amount of the Notes originally issued remain outstanding
immediately after the occurrence of such redemption and that such redemption
occurs within 90 days of the date of the closing of such Equity Offering.
 
MANDATORY REDEMPTION
 
     The Company will not be required to make mandatory redemption or sinking
fund payments with respect to the Notes.
 
SECURITY
 
  Interest Reserve
 
     The Indenture provides that, upon the closing of the sale of the Notes, the
Company must purchase and pledge to the Trustee for the benefit of the holders
of the Notes the Pledged Securities in such amount as will be sufficient upon
receipt of scheduled interest and principal payments on such Pledged Securities,
in the opinion of any nationally recognized firm of independent public
accountants selected by the Company, to provide payment in full of the first six
scheduled interest payments due on the Notes. The Company has used approximately
$56.8 million of the net proceeds of the sale of the Notes to acquire the
Pledged Securities. The Pledged Securities have been pledged by the Company to
the Trustee for the benefit of the holders of Notes pursuant to the Pledge
Agreement and will be held by the Trustee in the Pledge Account. Pursuant to the
Pledge Agreement, immediately prior to an interest payment date on the Notes,
the Company may either deposit with the Trustee from funds otherwise available
to the Company cash sufficient to pay the interest scheduled to be paid on such
date or the Company may direct the Trustee to release from the Pledge Account
proceeds sufficient to pay interest then due. In the event that the Company
exercises the former option, the Company may thereafter direct the Trustee to
release to the Company proceeds or Pledged Securities from the Pledge Account in
a like amount. A failure by the Company to pay interest on the Notes in a timely
manner through October 1, 2000 will constitute an immediate Event of Default
under the Indenture, with no grace or cure period.
 
     Interest earned on the Pledged Securities will be added to the Pledge
Account. In the event that the funds or Pledged Securities held in the Pledge
Account exceed the amount sufficient, in the opinion of a nationally recognized
firm of independent public accountants selected by the Company, to provide for
 
                                       56
<PAGE>   62
 
payment in full of the first six scheduled interest payments due on the Notes
(or, in the event an interest payment or payments have been made, an amount
sufficient to provide for payment in full of any interest payments remaining, up
to and including the sixth scheduled interest payment) the Trustee will be
permitted to release to the Company at the Company's request any such excess
amount. The Notes will be secured by a first priority security interest in the
Pledged Securities and in the Pledge Account and, accordingly, the Pledged
Securities and the Pledge Account will also secure repayment of the principal
amount of the Notes to the extent of such security.
 
     Under the Pledge Agreement, assuming that the Company makes the first six
scheduled interest payments on the Notes in a timely manner, all of the Pledged
Securities will be released from the Pledge Account.
 
  Telecommunications Equipment
 
     Pursuant to the Indenture and related documents, including the Security
Agreement, between the Company and the Trustee, the Trustee, for its benefit and
the benefit of the holders of the Notes, has received or will receive a security
interest in: (i) all Telecommunications Equipment currently owned by the Company
other than Telecommunications Equipment located in Las Vegas, Nevada or the
surrounding suburban area and all Telecommunications Equipment acquired by the
Company after the Issue Date (other than Telecommunications Equipment located or
to be located in Las Vegas, Nevada or the surrounding suburban area) and prior
to such time as the aggregate dollar value of the Company's purchases of
Telecommunications Equipment subsequent to the Issue Date (excluding
Telecommunications Equipment located or to be located in Las Vegas, Nevada or
the surrounding suburban area) equals or exceeds $100.0 million; (ii) the
proceeds of any sale or other disposition of such Telecommunications Equipment
(including any insurance proceeds from the loss or destruction of such
Telecommunications Equipment); and (iii) any additional Telecommunications
Related Assets acquired by the Company with the proceeds of any such sale or
other disposition of Telecommunications Equipment (collectively, the
"Collateral").
 
     If the Notes become due and payable prior to their stated maturity or are
not paid in full at the stated maturity thereof, the Trustee, on behalf of the
holders of the Notes, in addition to any other rights or remedies available to
it under the Indenture, may take such action as it deems advisable to protect
and enforce the rights of the Trustee and such holders in the Collateral,
including the institution of foreclosure proceedings. Any proceeds received by
the Trustee from the disposition of the Collateral will be applied by the
Trustee, first to pay certain expenses of the Trustee and the holders of the
Notes, second to pay interest with respect to the Notes, third to pay unpaid
principal of the Notes, fourth to pay costs and expenses of, and all premiums
on, and all other amounts due under, the Notes, and finally, to pay any
remainder to the Company or as a court of competent jurisdiction otherwise
directs.
 
     The right of the Trustee to repossess and dispose of the Collateral upon
the occurrence of an Event of Default is likely to be significantly impaired by
applicable bankruptcy law if a bankruptcy proceeding were to be commenced by or
against the Company prior to the Trustee's having disposed of the Collateral.
Under Title XI of the United States Code (the "Bankruptcy Code"), a secured
creditor such as the Trustee is prohibited from disposing of security
repossessed from a debtor in a bankruptcy case without bankruptcy court
approval. Moreover, the Bankruptcy Code prohibits a secured creditor from
disposing of collateral even though the debtor is in default under the
applicable debt instruments if the secured creditor is given "adequate
protection." The meaning of the term "adequate protection" may vary according to
circumstances, but it is intended in general to protect the value of the secured
creditor's interest in the collateral and may include cash payments or the
granting of additional security, if and at such times as the court in its
discretion determines, for any diminution in the value of the collateral as a
result of the stay of disposition during the pendency of the bankruptcy case. In
view of the lack of a precise definition of the term "adequate protection" and
the broad discretionary powers of a bankruptcy court, it is impossible to
predict how long payments under the Notes could be delayed following
commencement of a bankruptcy case, whether or when the Trustee could dispose of
the Collateral or whether or to what extent holders would be compensated for any
delay in payment or loss of value of the Collateral through the requirement of
"adequate protection."
 
                                       57
<PAGE>   63
 
     In addition, notwithstanding anything to the contrary described above,
unless an Event of Default shall have occurred and be continuing, the Company
will have the right to remain in possession of and retain exclusive control of
the Collateral, will have the right to freely utilize the Collateral (including
the right to lease such Collateral) and will have the right to collect, invest
and dispose of any income thereon. Upon any foreclosure by the Trustee, on
behalf of holders of the Notes, on any Collateral that has been made the subject
of a lease by the Company, the Trustee's ability to dispose of such Collateral
may be restricted by the terms of such lease arrangement. See "Risk
Factors -- Failure to Maintain Perfected Security Interest."
 
     Collateral may be released from the liens of the Indenture in connection
with an Asset Sale of Telecommunications Equipment, in which case the Company
will be required to comply with the covenant described below under "-- Certain
Covenants -- Asset Sales."
 
OFFER TO PURCHASE UPON CHANGE OF CONTROL
 
     Upon the occurrence of a Change of Control, the Company will be required to
make an offer (the "Change of Control Offer") to each holder of Notes to
repurchase all or any part (equal to $1,000 or an integral multiple thereof) of
such holder's Notes at a purchase price equal to 101% of the aggregate principal
amount thereof plus accrued and unpaid interest and Liquidated Damages, if any,
thereon to the date of purchase (the "Change of Control Payment"). The Change of
Control Offer must be commenced within 30 days following a Change of Control,
must remain open for at least 30 and not more than 40 days (unless required by
applicable law) and must comply with the requirements of Rule 14e-1 under the
Securities Exchange Act of 1934, as amended (the "Exchange Act") and any other
applicable securities laws and regulations.
 
     Except as described above with respect to a Change of Control, the
Indenture will not contain provisions that permit the holders of the Notes to
require that the Company repurchase or redeem the Notes in the event of a
takeover, recapitalization or similar transaction.
 
     Due to the leveraged structure of the Company and the effective
subordination of the Notes to other secured Indebtedness of the Company and
future Indebtedness of the Company's Subsidiaries, the Company may not have
sufficient funds available to purchase the Notes tendered in response to a
Change of Control Offer. In addition, the agreements relating to future
Indebtedness of the Company's Subsidiaries may contain prohibitions or
restrictions on the Company's ability to effect a Change of Control Payment.
 
     The definition of Change of Control includes a phrase relating to the sale,
lease, transfer, conveyance or other disposition of "all or substantially all"
of the Company's assets. Although there is a developing body of case law
interpreting the phrase "substantially all," there is no precise established
definition of the phrase under applicable law. Accordingly, the ability of a
holder of Notes to require the Company to repurchase such Notes as a result of a
sale, lease, transfer, conveyance or other disposition of less than all of the
assets of the Company to another Person may be uncertain.
 
OFFER TO PURCHASE WITH EXCESS ASSET SALE PROCEEDS
 
     When the cumulative amount of Excess Proceeds (as defined below under
"Certain Covenants -- Asset Sales") exceeds $5.0 million, the Company will make
an offer to all holders of Notes and Pari Passu Notes (an "Excess Proceeds
Offer"), to purchase the maximum principal amount of Notes and Pari Passu Notes
that may be purchased out of such Excess Proceeds, at an offer price in cash in
an amount equal to 100% of the outstanding principal amount of the Notes and
100% of the accreted value or 100% of the outstanding principal amount, as
applicable, of the Pari Passu Notes, plus accrued and unpaid interest and
Liquidated Damages thereon, if any, to the date fixed for the closing of such
offer, in accordance with the procedures specified in the Indenture.
 
     If the aggregate principal amount and/or accreted value, as the case may
be, of Notes and Pari Passu Notes surrendered by holders thereof exceeds the
amount of Excess Proceeds, the Trustee will select the Notes and Pari Passu
Notes to be purchased on a pro rata basis. To the extent that the aggregate
amount of Notes and Pari Passu Notes tendered pursuant to an Excess Proceeds
Offer is less than the amount of Excess
 
                                       58
<PAGE>   64
 
Proceeds, the Company may use such deficiency for general purposes. Upon
completion of an Excess Proceeds Offer, the amount of Excess Proceeds will be
reset at zero.
 
SELECTION OF NOTES FOR REDEMPTION OR OFFERS TO PURCHASE
 
     If less than all of the Notes are to be redeemed or to be purchased
pursuant to any purchase offer required under the Indenture at any time,
selection of Notes for redemption or purchase will be made by the Trustee in
compliance with the requirements of the principal national securities exchange,
if any, on which the Notes are listed, or, if the Notes are not so listed, on a
pro rata basis, by lot or by such method as the Trustee shall deem fair and
appropriate, provided that no Notes with a principal amount of $1,000 or less
shall be redeemed or purchased in part. A new Note in principal amount equal to
the unredeemed or unpurchased portion will be issued in the name of the holder
thereof upon cancellation of the original Note. On and after the redemption or
purchase date, interest will cease to accrue on the Notes or portions of them
called for redemption or purchase.
 
NOTICE OF REDEMPTION
 
     Notice of redemption shall be mailed by first class mail at least 30 but
not more than 60 days before the redemption date to each holder of Notes to be
redeemed at its registered address. If any Note is to be redeemed in part only,
the notice of redemption that relates to such Note shall state the portion of
the principal amount to be redeemed.
 
CERTAIN COVENANTS
 
  Restricted Payments
 
     The Indenture provides that the Company and its Restricted Subsidiaries may
not, directly or indirectly:
 
          (i) declare or pay any dividend or make any distribution on account of
     any Equity Interests of the Company or any of its Restricted Subsidiaries
     other than dividends or distributions payable (A) in Equity Interests of
     the Company that are not Disqualified Stock or (B) to the Company or any
     Restricted Subsidiary;
 
          (ii) purchase, redeem, defease, retire or otherwise acquire for value
     ("Retire" and correlatively, a "Retirement") any Equity Interests of the
     Company or any of its Restricted Subsidiaries or other Affiliate of the
     Company (other than any such Equity Interests owned by the Company or any
     Restricted Subsidiary);
 
          (iii) Retire for value any Indebtedness of (A) the Company that is
     subordinate in right of payment to the Notes or (B) any Restricted
     Subsidiary, except, with respect to clause (A) or (B) above, at final
     maturity or in accordance with the mandatory redemption or repayment
     provisions set forth in the original documentation governing such
     Indebtedness; or
 
          (iv) make any Restricted Investment (all such payments and other
     actions set forth in clauses (i) through (iv) above being collectively
     referred to as "Restricted Payments"), unless, at the time of such
     Restricted Payment:
 
             (a) no Default or Event of Default has occurred and is continuing
        or would occur as a consequence thereof;
 
             (b) after giving effect to such Restricted Payment on a pro forma
        basis as if such Restricted Payment had been made at the beginning of
        the applicable four-quarter period, the Company could incur at least
        $1.00 of additional Indebtedness pursuant to the Consolidated Cash Flow
        Leverage Ratio test described under "-- Incurrence of Indebtedness and
        Issuance of Disqualified Stock;" and
 
             (c) such Restricted Payment, together with the aggregate of all
        other Restricted Payments made by the Company and its Restricted
        Subsidiaries after the Issue Date (including any Restricted
 
                                       59
<PAGE>   65
 
        Payments made pursuant to clauses (i), (v) and (vi) of the next
        paragraph), minus any Restricted Payment Credits, is less than the sum
        of
 
                (x) 50% of the Consolidated Net Income of the Company for the
           period (taken as one accounting period) from the Issue Date to the
           end of the Company's most recently ended fiscal quarter for which
           internal financial statements are available at the time of such
           Restricted Payment (or, if such Consolidated Net Income for such
           period is a deficit, less 100% of such deficit), plus
 
                (y) 100% of the aggregate net cash proceeds received by the
           Company from the issue or sale of Equity Interests of the Company or
           of debt securities or Disqualified Stock of the Company that have
           been converted into such Equity Interests (other than Equity
           Interests (or convertible debt securities) sold to a Restricted
           Subsidiary of the Company and other than Disqualified Stock or debt
           securities that have been converted into Disqualified Stock) after
           the Issue Date (other than any such Equity Interests, the proceeds of
           which were used as set forth in clause (ii) below), plus
 
                (z) $2.0 million.
 
          The foregoing provisions will not prohibit:
 
          (i) the payment of any dividend within 60 days after the date of
     declaration thereof, if at such date of declaration such payment would have
     complied with the provisions of the Indenture;
 
          (ii) the Retirement of (A) any Equity Interests of the Company or any
     Restricted Subsidiary of the Company, (B) Indebtedness of the Company that
     is subordinate to the Notes or (C) Indebtedness of a Restricted Subsidiary
     of the Company, in exchange for, or out of the proceeds of the
     substantially concurrent sale (other than to a Restricted Subsidiary of the
     Company) of, Equity Interests of the Company (other than Disqualified
     Stock);
 
          (iii) the Retirement of any Indebtedness of the Company subordinated
     in right of payment to the Notes in exchange for, or out of the proceeds
     of, the substantially concurrent incurrence of Indebtedness of the Company
     (other than Indebtedness to a Restricted Subsidiary of the Company), but
     only to the extent that such new Indebtedness is permitted under the
     covenant described below under the caption, "-- Incurrence of Indebtedness
     and Issuance of Disqualified Stock" and (1) is subordinated in right of
     payment to the Notes at least to the same extent as, (2) has a Weighted
     Average Life to Maturity at least as long as, and (3) has no scheduled
     principal payments due in any amount earlier than, any equivalent amount of
     principal under the Indebtedness so Retired;
 
          (iv) the Retirement of any Indebtedness of a Restricted Subsidiary of
     the Company in exchange for, or out of the proceeds of, the substantially
     concurrent incurrence of Indebtedness of the Company or any Restricted
     Subsidiary but only to the extent that such incurrence is permitted under
     the covenant described below under the caption "-- Incurrence of
     Indebtedness and Issuance of Disqualified Stock" and only to the extent
     that such Indebtedness (1) is not secured by any assets of the Company or
     any Restricted Subsidiary to a greater extent than the Indebtedness so
     Retired was so secured, (2) has a Weighted Average Life to Maturity at
     least as long as the Indebtedness so Retired and (3) if the Indebtedness so
     Retired was an obligation of the Company, is pari passu or subordinated in
     right of payment to the Notes at least to the same extent as the
     Indebtedness so Retired;
 
          (v) the Retirement of any Equity Interests of the Company or any
     Restricted Subsidiary of the Company held by any member of the Company's
     (or any of its Subsidiaries') management pursuant to any management equity
     subscription agreement or stock option agreement; provided that the
     aggregate price paid for all such repurchased, redeemed, acquired or
     retired Equity Interests shall not exceed $250,000 in any twelve-month
     period plus the aggregate cash proceeds received by the Company during such
     twelve-month period from any reissuance of Equity Interests by the Company
     to members of management of the Company and its Subsidiaries;
 
                                       60
<PAGE>   66
 
          (vi) the Retirement of any Equity Interests of the Company held by
     Nield J. Montgomery, Mitchell Allee or John Boersma pursuant to the terms
     of agreements between the Company and each such individual in effect on the
     Issue Date upon or following any termination of employment of any of them;
     provided that the aggregate price paid for all such repurchased, redeemed,
     acquired or retired Equity Interests shall not exceed $500,000 in any
     twelve-month period; and
 
          (vii) the payment of cash in lieu of fractional shares (a) payable as
     dividends on Equity Interests of the Company or (b) issuable upon
     conversion of or in exchange for securities convertible into or
     exchangeable for Equity Interests of the Company or (c) issuable as a
     result of a corporate reorganization, provided that, in the case of (a) and
     (b), the issuance of such Equity Interests or securities and, in the case
     of (c), such corporate reorganization, was permitted under the terms of the
     Indenture;
 
provided, however, that at the time of, and after giving effect to, any
Restricted Payment permitted under clauses (i), (ii), (iii), (iv), (v), (vi) and
(vii), no Default or Event of Default shall have occurred and be continuing.
 
     The Indenture also provides that a Permitted Investment that ceases to be a
Permitted Investment pursuant to the definition thereof, shall become a
Restricted Investment, deemed to have been made on the date that it ceases to be
a Permitted Investment.
 
     The Board of Directors may designate any Subsidiary to be an Unrestricted
Subsidiary if such designation would not cause a Default or an Event of Default,
provided, however, the Company may not designate any Subsidiary which holds any
permit or license which is material to the operations of the Company and its
Restricted Subsidiaries taken as a whole as an Unrestricted Subsidiary. For
purposes of making such determination, all outstanding Investments by the
Company and its Restricted Subsidiaries (except to the extent repaid in cash) in
such Subsidiary so designated will be deemed to be Restricted Payments at the
time of such designation and will reduce the amount available for Restricted
Payments under the first paragraph of this covenant. All such outstanding
Investments will be deemed to constitute Investments in an amount equal to the
greatest of (x) the net book value of such Investments at the time of such
designation, (y) the fair market value of such Investments at the time of such
designation and (z) the original fair market value of such Investments at the
time they were made. Such designation will only be permitted if such Restricted
Payment would be permitted at such time.
 
     The Board of Directors of the Company may at any time designate any
Unrestricted Subsidiary to be a Restricted Subsidiary; provided that such
designation shall be deemed to be an incurrence of Indebtedness by a Restricted
Subsidiary of the Company of any outstanding Indebtedness of such Unrestricted
Subsidiary and such designation shall only be permitted if (i) such Indebtedness
is permitted under the covenant entitled "-- Incurrence of Indebtedness and
Issuance of Disqualified Stock," and (ii) no Default or Event of Default would
be in existence following such designation.
 
     Not later than the date of making any Restricted Payment, the Company shall
deliver to the Trustee an Officers' Certificate stating that such Restricted
Payment is permitted and setting forth the basis upon which the calculations
required by the covenant "-- Restricted Payments" were computed, which
calculations may be based upon the Company's latest available financial
statements. The Trustee shall have no duty or obligation to confirm or verify
the calculations set forth in such Officers' Certificate.
 
  Incurrence of Indebtedness and Issuance of Disqualified Stock
 
     The Indenture provides that:
 
          (i) the Company and its Restricted Subsidiaries may not, directly or
     indirectly, create, incur, issue, assume, guarantee or otherwise become
     directly or indirectly liable for the payment of (collectively, "incur"
     and, correlatively, "incurred" and "incurrence") any Indebtedness
     (including, without limitation, Acquired Debt) and
 
          (ii) the Company and its Restricted Subsidiaries may not issue any
     Disqualified Stock,
 
                                       61
<PAGE>   67
 
provided, however, that the Company and/or any of its Restricted Subsidiaries
may incur Indebtedness (including, without limitation, Acquired Debt) or issue
shares of Disqualified Stock if, after giving effect to the incurrence of such
Indebtedness or the issuance of such Disqualified Stock, the Consolidated Cash
Flow Leverage Ratio for the Company's most recently ended four full fiscal
quarters for which internal financial statements are available immediately
preceding the date of such incurrence or issuance (A) does not exceed 5.5 to 1
if such incurrence or issuance occurs on or prior to October 1, 2000 and (B)
does not exceed 5.0 to 1 if such incurrence or issuance occurs after October 1,
2000, in each case, determined on a pro forma basis (including a pro forma
application of the net proceeds therefrom), as if the additional Indebtedness
had been incurred, or the Disqualified Stock had been issued, as the case may
be, at the beginning of such four-quarter period. If the Company incurs any
Indebtedness or issues or redeems any Preferred Stock subsequent to the
commencement of the period for which such ratio is being calculated but prior to
the event for which the calculation of the ratio is made, then the ratio will be
calculated giving pro forma effect to any such incurrence of Indebtedness, or
such issuance or redemption of Preferred Stock, as if the same had occurred at
the beginning of the applicable period. In making such calculation on a pro
forma basis, interest attributable to Indebtedness bearing a floating interest
rate shall be computed as if the rate in effect on the date of computation had
been the applicable rate for the entire period.
 
     The foregoing limitation will not apply to (with each exception to be given
independent effect):
 
          (a) the incurrence by the Company and/or any of its Restricted
     Subsidiaries of Indebtedness under the Credit Facility in an aggregate
     principal amount at any one time outstanding (with letters of credit being
     deemed to have a principal amount equal to the maximum potential liability
     of the Company and/or any of its Restricted Subsidiaries thereunder) not to
     exceed $25.0 million, less the aggregate amount of all Net Proceeds of
     Asset Sales applied to permanently reduce the commitments with respect to
     such Indebtedness pursuant to the covenant described above under the
     caption "-- Asset Sales;"
 
          (b) the incurrence by the Company and/or any of its Restricted
     Subsidiaries of Vendor Indebtedness, provided that the aggregate amount of
     such Vendor Indebtedness incurred does not exceed 80% of the total cost of
     the Telecommunications Related Assets financed therewith (or 100% of the
     total cost of the Telecommunications Related Assets financed therewith if
     such Vendor Indebtedness was extended for the purchase of tangible physical
     assets and was so financed by the vendor thereof or an affiliate of such
     vendor);
 
          (c) the incurrence by the Company and/or any of its Subsidiaries of
     the Existing Indebtedness;
 
          (d) the incurrence by the Company and/or any of its Restricted
     Subsidiaries of Indebtedness in an aggregate amount not to exceed $5.0
     million at any one time outstanding;
 
          (e) the incurrence by the Company of (1) Indebtedness (other than
     secured Acquired Debt) in an aggregate principal amount not to exceed 2.0
     times the sum of the net cash proceeds received by the Company after the
     closing of the Preferred Stock Offering or, if the Preferred Stock Offering
     is not closed, the closing of the Common Stock Commitment from the issuance
     and sale of Equity Interests of the Company (that are not Disqualified
     Stock), plus the fair market value of Equity Interests (other than
     Disqualified Stock) issued after consummation of a Qualified Equity
     Offering in connection with an acquisition of a Telecommunications Business
     or Telecommunications Related Assets and (2) subsequent to consummation of
     a Qualified Equity Offering, secured Acquired Debt, in an aggregate
     principal amount not to exceed (i) the net cash proceeds received by the
     Company from the issuance and sale of Equity Interests of the Company
     (other than Disqualified Stock) subsequent to the consummation of a
     Qualified Equity Offering plus (ii) the fair market value of Equity
     Interests (other than Disqualified Stock) issued in connection with any
     acquisition of a Telecommunications Business or Telecommunications Related
     Assets subsequent to the consummation of a Qualified Equity Offering;
     provided, however, to the extent the Company incurs secured Acquired Debt
     pursuant to the provisions of this clause (2), its ability to incur
     Indebtedness pursuant to clause (1) of this clause (e) shall be reduced by
     an amount equal to two times the aggregate principal amount of secured
     Acquired Debt so incurred;
 
          (f) the incurrence (a "Permitted Refinancing") by the Company and/or
     any of its Restricted Subsidiaries of Indebtedness issued in exchange for,
     or the proceeds of which are used to refinance,
 
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<PAGE>   68
 
     replace, refund or defease ("Refinance" and correlatively, "Refinanced" and
     "Refinancing") Indebtedness, other than Indebtedness incurred pursuant to
     clause (a) above, but only to the extent that:
 
             (1) the net proceeds of such Refinancing Indebtedness do not exceed
        the principal amount of and premium, if any, and accrued interest on the
        Indebtedness so Refinanced (or if such Indebtedness was issued at an
        original issue discount, the original issue price plus amortization of
        the original issue discount at the time of the repayment of such
        Indebtedness) plus the fees, expenses and costs of such Refinancing and
        prepayment premiums, if any, in connection therewith;
 
             (2) the Refinancing Indebtedness shall have a final maturity no
        earlier than, and a Weighted Average Life to Maturity equal to or
        greater than, the final maturity and Weighted Average Life to Maturity
        of the Indebtedness being Refinanced; and
 
             (3) if the Indebtedness being Refinanced is subordinated in right
        of payment to the Notes, the Refinancing Indebtedness shall be
        subordinated in right of payment to the Notes on terms at least as
        favorable to the holders of Notes as those contained in the
        documentation governing the Indebtedness being so Refinanced;
 
          (g) the incurrence by the Company or any of its Restricted
     Subsidiaries of intercompany Indebtedness between or among the Company and
     any of its Restricted Subsidiaries; and
 
          (h) the incurrence by the Company or any of its Restricted
     Subsidiaries of Hedging Obligations that are incurred for the purpose of
     fixing or hedging interest rate or foreign currency risk with respect to
     any floating rate Indebtedness that is permitted by the terms of the
     Indenture to be outstanding.
 
     For purposes of determining compliance with this covenant, in the event
that an item of Indebtedness or Disqualified Stock meets the criteria of more
than one of the categories described in clauses (a) through (h) above or is
entitled to be incurred pursuant to the first paragraph of this covenant, the
Company shall, in its sole discretion, classify such item in any manner that
complies with this covenant and such item will be treated as having been
incurred pursuant to only one of such clauses or pursuant to the first paragraph
herein. Accrual of interest or dividends, the accretion of accreted value or
liquidation preference and the payment of interest or dividends in the form or
additional Indebtedness, Common Stock or Preferred Stock will not be deemed to
be an incurrence of Indebtedness for purposes of this covenant.
 
  Asset Sales
 
     The Indenture provides that the Company and its Restricted Subsidiaries may
not, whether in a single transaction or a series of related transactions
occurring within any twelve-month period,
 
          (i) sell, lease, convey, dispose or otherwise transfer any assets
     (including by way of a Sale and Leaseback Transaction) other than sales,
     leases, conveyances, dispositions or other transfers (A) in the ordinary
     course of business, (B) to the Company by any Restricted Subsidiary of the
     Company or from the Company to any Restricted Subsidiary of the Company,
     (C) that constitute a Restricted Payment, Investment or dividend or
     distribution permitted under the covenant described below under the caption
     "Restricted Payments" or (D) that constitute the disposition of all or
     substantially all of the assets of the Company pursuant to the covenant
     described above under the caption "Merger, Consolidation or Sale of Assets"
     or
 
          (ii) issue or sell Equity Interests in any of its Restricted
     Subsidiaries (other than an issuance or sale of Equity Interests of any
     such Restricted Subsidiary to the Company or a Restricted Subsidiary),
 
if, in the case of either (i) or (ii) above, in a single transaction or a series
of related transactions occurring within any twelve-month period, such assets or
securities
 
          (x) have a Fair Market Value in excess of $2.0 million (excluding the
     Fair Market Value of Telecommunications Equipment sold to ILECs in
     connection with establishing virtual collocation arrangements with such
     ILECs) or
 
                                       63
<PAGE>   69
 
          (y) are sold or otherwise disposed of for net proceeds in excess of
     $2.0 million (each of the foregoing, an "Asset Sale"), unless:
 
             (a) no Default or Event of Default exists or would occur as a
        result thereof;
 
             (b) the Company, or such Restricted Subsidiary, as the case may be,
        receives (except in the case of sales of Telecommunications Equipment to
        ILECs in connection with establishing virtual collocation arrangements
        with such ILECs) consideration at the time of such Asset Sale at least
        equal to the Fair Market Value (evidenced by a resolution of the Board
        of Directors of the Company set forth in an Officers' Certificate
        delivered to the Trustee), of the assets or securities issued or sold or
        otherwise disposed of; and
 
             (c) at least 85% of the consideration therefor received by the
        Company or such Restricted Subsidiary is in the form of cash, provided,
        however, that (A) the amount of (x) any liabilities (as shown on the
        Company's or such Restricted Subsidiary's most recent balance sheet or
        in the notes thereto) of the Company or any Restricted Subsidiary of the
        Company (other than liabilities that are by their terms subordinated to
        the Notes) that are assumed by the transferee of any such assets and (y)
        any notes, obligations or other securities received by the Company or
        any such Restricted Subsidiary from such transferee that are immediately
        converted by the Company or such Restricted Subsidiary into cash, shall
        be deemed to be cash (to the extent of the cash received in the case of
        subclause (y)) for purposes of this clause (c); and (B) an amount equal
        to the Fair Market Value (determined as set forth in clause (b) above)
        of Telecommunications Related Assets received by the Company or any such
        Restricted Subsidiary from the transferee that will be used by the
        Company or any such Restricted Subsidiary in the operation of a
        Telecommunications Business in the United States will be deemed to be
        cash for purposes of this clause (c).
 
The foregoing provisions will not apply to a sale, lease, conveyance or other
disposition of all or substantially all of the assets of the Company, which will
be governed by the provisions of the Indenture described below under "-- Merger,
Consolidation, or Sale of Assets."
 
     The Indenture also provides that within 365 days after the receipt of net
proceeds of any Asset Sale, the Company (or such Restricted Subsidiary, as the
case may be) may apply the Net Proceeds from such Asset Sale to (i) permanently
reduce the amounts permitted to be borrowed by the Company under the terms of
any of its Senior Indebtedness or (ii) the purchase of Telecommunications
Related Assets or Voting Stock of any Person engaged in the Telecommunications
Business in the United States (provided that such Person concurrently becomes a
Restricted Subsidiary of the Company). Any Net Proceeds from any Asset Sales
that are not so applied or invested will constitute "Excess Proceeds." When the
aggregate amount of Excess Proceeds exceeds $5.0 million, the Company will be
required to make an Excess Proceeds Offer in accordance with the terms set forth
under "-- Offer to Purchase with Excess Asset Sale Proceeds."
 
  Liens
 
     The Indenture provides that the Company and its Restricted Subsidiaries may
not, directly or indirectly, create, incur, assume or suffer to exist any Lien
on any asset now owned or hereafter acquired, or any income or profits therefrom
or assign or convey any right to receive income therefrom, except for Permitted
Liens.
 
  Dividend and Other Payment Restrictions Affecting Subsidiaries
 
     The Indenture provides that the Company and its Restricted Subsidiaries may
not, directly or indirectly, create or otherwise cause to become effective any
consensual encumbrance or restriction on the ability of any Restricted
Subsidiary to:
 
          (i) pay dividends or make any other distributions to the Company or
     any of its Restricted Subsidiaries on its Capital Stock or with respect to
     any other interest or participation in, or measured by, its profits, or pay
     any Indebtedness owed to the Company or any of its Restricted Subsidiaries;
 
          (ii) make loans or advances to the Company or any of its Restricted
     Subsidiaries; or
 
                                       64
<PAGE>   70
 
          (iii) transfer any of its properties or assets to the Company or any
     of its Restricted Subsidiaries;
 
          except for such encumbrances or restrictions existing as of the Issue
     Date or under or by reason of:
 
             (a) Existing Indebtedness;
 
             (b) applicable law;
 
             (c) any instrument governing Acquired Debt as in effect at the time
        of acquisition (except to the extent such Indebtedness was incurred in
        connection with, or in contemplation of, such acquisition), which
        encumbrance or restriction is not applicable to any Person, or the
        properties or assets of any Person, other than the Person, or the
        property or assets of the Person, so acquired;
 
             (d) by reason of customary non-assignment provisions in leases
        entered into in the ordinary course of business and consistent with past
        practices;
 
             (e) Indebtedness in respect of a Permitted Refinancing, provided
        that the restrictions contained in the agreements governing such
        Refinancing Indebtedness are not materially more restrictive than those
        contained in the agreements governing the Indebtedness being refinanced;
 
             (f) with respect to clause (iii) above, purchase money obligations
        for property acquired in the ordinary course of business, Vendor
        Indebtedness incurred in connection with the purchase or lease of
        Telecommunications Related Assets or performance bonds or similar
        security for performance which liens securing such obligations do not
        cover any asset other than the asset acquired or, in the case of
        performance bonds or similar security for performance, the assets
        associated with the Company's performance;
 
             (g) Indebtedness incurred under clause (a) of the covenant entitled
        "-- Incurrence of Indebtedness and Issuance of Disqualified Stock;"
 
             (h) the Indenture and the Notes; or
 
             (i) in the case of clauses (a), (c), (e), (f), (g) and (h) above,
        any amendments, modifications, restatements, renewals, increases,
        supplements, refundings, replacements or refinancings thereof, provided
        that such amendments, modifications, restatements, renewals, increases,
        supplements, refundings, replacements or refinancings are not materially
        more restrictive with respect to such dividend and other payment
        restrictions than those contained in such instruments as in effect on
        the date of their incurrence or, if later, the Issue Date.
 
  Use of Proceeds
 
     The Indenture provides that the Company may use the gross proceeds from the
sale of the Notes only for the following purposes:
 
          (i) to pay the fees and expenses of the issuance of the Notes
     including any discount or commission to the Initial Purchasers of the
     Notes;
 
          (ii) to acquire Telecommunications Related Assets (other than Voting
     Stock), including the payment of the purchase price and related sales and
     use taxes therefor and shipping, handling, storage, transportation, testing
     and insurance charges, design, integration and site preparation expenses
     and installation and service/warranty costs associated with the acquisition
     of any Telecommunications Related Assets;
 
          (iii) to acquire the Voting Stock of any Person engaged in the
     Telecommunications Business in the United States to the extent that the
     purchase price paid by the Company or any Restricted Subsidiary for such
     Voting Stock is allocated (as determined by a resolution of the Board of
     Directors) to the purchase of Telecommunications Equipment at a purchase
     price not in excess of fair market value;
 
          (iv) to purchase the Pledged Securities; and
 
          (v) for working capital purposes.
 
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<PAGE>   71
 
     The Company will deliver to the Trustee an Officer's Certificate with each
annual compliance certificate certifying that the proceeds of the Notes were
applied in accordance with this covenant.
 
  Security Interests
 
     The Indenture provides that, until the date upon which the Trustee has been
granted a first priority security interest in Telecommunications Equipment
purchased after the Issue Date having a purchase price at least equal to $100.0
million, upon the acquisition of any Telecommunications Equipment, other than
Telecommunications Equipment located or to be located in Las Vegas, Nevada or
the surrounding suburban area, the Company will, and will cause its Restricted
Subsidiaries to, take such action as is required to vest in the Trustee a first
priority security interest in such Telecommunications Equipment, for the benefit
of the holders of Notes, and thereupon all provisions of the Indenture relating
to Collateral shall be deemed to relate to and include such Telecommunications
Equipment. On the Closing Date and from time to time thereafter, the Company
will, and will cause each Restricted Subsidiary to, execute such security
instruments and financing statements as may be reasonably necessary to vest in
the Trustee such security interest. In addition, with respect to any
telecommunications switch that constitutes Collateral, the Company will post a
notice on, or in the location housing, such telecommunications switch,
identifying the Company or the relevant Restricted Subsidiary as the owner of
such telecommunications switch and stating that such telecommunications switch
is subject to the security interest under the Indenture. The release of any lien
on Telecommunications Equipment upon the sale thereof to any ILEC in connection
with the establishment of a virtual collocation with such ILEC shall not
eliminate the credit of the purchase price of such Telecommunications Equipment
against the $100.0 million requirement set forth in the first sentence of this
paragraph, provided that upon any reacquisition by the Company of title to such
Telecommunications Equipment the first priority security interest granted to the
Trustee in such Telecommunications Equipment shall be reinstated.
 
  Impairment of Security Interest
 
     The Indenture provides that the Company will, and will cause its Restricted
Subsidiaries to, on or prior to the Closing Date, file UCC-1s in each state in
the United States in which any Collateral is located covering all such
Collateral, to file UCC-1s in additional states from time to time as may be
necessary to cover Collateral acquired after the Issue Date and to file such
UCC-3 continuation statements from time to time as may be necessary to continue
the effectiveness of such filings and the Company will not, and will not permit
any of its Restricted Subsidiaries to, grant to any Person (other than the
Trustee on behalf of holders of the Notes) any security interest in the
Collateral.
 
  Merger, Consolidation or Sale of Assets
 
     The Indenture provides that the Company may not consolidate or merge with
or into (whether or not the Company is the surviving entity), or sell, assign,
transfer, lease, convey or otherwise dispose of all or substantially all of its
properties or assets in one or more related transactions to, another
corporation, Person or entity unless:
 
          (i) the Company is the surviving entity or the entity or Person formed
     by or surviving any such consolidation or merger (if other than the
     Company) or to which such sale, assignment, transfer, lease, conveyance or
     other disposition has been made is a corporation organized or existing
     under the laws of the United States, any state thereof or the District of
     Columbia;
 
          (ii) the entity or Person formed by or surviving any such
     consolidation or merger (if other than the Company) or the entity or Person
     to which such sale, assignment, transfer, lease, conveyance or other
     disposition has been made assumes all the obligations of the Company under
     the Notes, the Indenture, the Pledge Agreement and the Security Agreement
     pursuant to a supplemental indenture in form reasonably satisfactory to the
     Trustee;
 
          (iii) immediately after such transaction no Default or Event of
     Default exists;
 
                                       66
<PAGE>   72
 
          (iv) except in connection with a Merger with or into a wholly owned
     subsidiary of the Company, the Company, or any entity or Person formed by
     or surviving any such consolidation or merger, or to which such sale,
     assignment, transfer, lease, conveyance or other disposition has been made,
     at the time of such transaction after giving pro forma effect thereto as if
     such transaction had occurred at the beginning of the applicable fiscal
     quarter (including any Indebtedness incurred or anticipated to be incurred
     in connection with or in respect of such transaction (A) could incur at
     least $1.00 of additional Indebtedness pursuant to the Consolidated Cash
     Flow Leverage Ratio test described under "-- Incurrence of Indebtedness and
     Issuance of Disqualified Stock" and (B) has Consolidated Net Worth in an
     amount which is equal to or greater than the Consolidated Net Worth of the
     Company immediately prior to such transaction;
 
          (v) such transaction would not result in the loss, material impairment
     or adverse modification or amendment of any authorization or license of the
     Company or its Restricted Subsidiaries that would have a material adverse
     effect on the business or operations of the Company and its Restricted
     Subsidiaries taken as a whole; and
 
          (vi) the Company has delivered to the Trustee an Officer's Certificate
     and an Opinion of Counsel each to the effect that, with respect to the
     transaction, items (i) through (v) as stated above have been satisfied.
 
  Transactions with Affiliates
 
     The Indenture provides that the Company and its Restricted Subsidiaries may
not sell, lease, transfer or otherwise dispose of any of their respective
properties or assets to, or purchase any property or assets from, or enter into
any contract, agreement, understanding, loan, advance or guarantee with, or for
the benefit of, any Affiliate (each of the foregoing, an "Affiliate
Transaction"), unless:
 
          (i) such Affiliate Transaction is on terms that are no less favorable
     to the Company or the relevant Restricted Subsidiary than those that would
     have been obtained in a comparable transaction by the Company or such
     Restricted Subsidiary with an unrelated Person;
 
          (ii) such Affiliate Transaction is approved by a majority of the
     disinterested directors on the Board of Directors of the Company;
 
          (iii) the Company delivers to the Trustee, with respect to any
     Affiliate Transaction involving aggregate payments in excess of $1.0
     million, a resolution of a committee of independent directors of the
     Company set forth in an Officers' Certificate certifying that such
     Affiliate Transaction complies with clauses (i) and (ii) above; and
 
          (iv) the Company delivers to the Trustee, with respect to any
     Affiliate Transaction involving aggregate payments in excess of $5.0
     million, an opinion of an Independent Appraiser that such Affiliate
     Transaction complies with clause (i) above;
 
     provided that
 
             (a) transactions pursuant to any employment, stock option or stock
        purchase agreement entered into by the Company or any of its Restricted
        Subsidiaries, or any grant of stock, in the ordinary course of business
        that are approved by the Board of Directors of the Company,
 
             (b) transactions between or among the Company and its Restricted
        Subsidiaries,
 
             (c) transactions permitted by the provisions of the Indenture
        described above under the covenant "-- Restricted Payments,"
 
             (d) loans and advances to employees and officers of the Company or
        any of its Restricted Subsidiaries in the ordinary course of business in
        an aggregate principal amount not to exceed $1.0 million at any one time
        outstanding, and
 
                                       67
<PAGE>   73
 
             (e) transactions pursuant to existing contracts to which the
        Company is a party in accordance with the terms of such contracts as
        they exist on the Issue Date,
 
shall not be deemed Affiliate Transactions.
 
  Business Activities
 
     The Indenture provides that the Company and its Restricted Subsidiaries may
not, directly or indirectly, engage in any business other than the
Telecommunications Business.
 
     The Indenture will provide that, until such time as the Company's
Consolidated EBITDA is positive for each of two consecutive fiscal quarters, the
Company and its Restricted Subsidiaries may not, directly or indirectly (through
the acquisition of Voting Stock, corporate reorganization or otherwise),
purchase, lease, acquire, install or operate more than twenty telecommunications
switches (including telecommunications switches already installed but excluding
remote switches); provided, however, that the 20 switch limitation shall be
increased by the number of telecommunications switches that could be purchased
with the net proceeds to the Company from the sale of any Equity Interests
(other than Disqualified Stock) subsequent to the closing of the Preferred Stock
Offering or, if the Preferred Stock Offering is not closed, the closing of the
Common Stock Commitment.
 
  Limitations on Sale and Leaseback Transactions
 
     The Indenture provides that the Company and its Restricted Subsidiaries may
not, directly or indirectly, enter into, assume, Guarantee or otherwise become
liable with respect to any Sale and Leaseback Transaction, provided that the
Company or any Restricted Subsidiary of the Company may enter into any such
transaction if (i) the Company or such Restricted Subsidiary would be permitted
under the covenants described above under "-- Incurrence of Indebtedness and
Issuance of Disqualified Stock" and "-- Liens" to incur secured Indebtedness in
an amount equal to the Attributable Debt with respect to such transaction, (ii)
the consideration received by the Company or such Restricted Subsidiary from
such transaction is at least equal to the Fair Market Value of the property
being transferred, and (iii) the Net Proceeds received by the Company or such
Restricted Subsidiary from such transaction are applied in accordance with the
covenant described above under the caption "-- Asset Sales."
 
  Reports
 
     The Indenture provides that the Company will file with the Trustee within
15 days after it files them with the Securities and Exchange Commission (the
"Commission") copies of the annual and quarterly reports and the information,
documents, and other reports that the Company is required to file with the
Commission pursuant to Section 13(a) or 15(d) of the Exchange Act ("SEC
Reports"). In the event the Company is not required or shall cease to be
required to file SEC Reports, pursuant to the Exchange Act, the Company will
nevertheless continue to file such reports with the Commission (unless the
Commission will not accept such a filing) and the Trustee. Whether or not
required by the Exchange Act to file SEC Reports with the Commission, so long as
any Notes are outstanding, the Company will furnish copies of the SEC Reports to
the holders of Notes at the time the Company is required to file the same with
the Trustee and make such information available to investors who request it in
writing. In addition, the Company has agreed that, for so long as any Notes
remain outstanding, it will furnish to the holders and to securities analysts
and prospective investors, upon their request, the information required to be
delivered pursuant to Rule 144A(d)(4) under the Securities Act.
 
  Payments for Consent
 
     The Indenture provides that neither the Company nor any of its Affiliates
shall, directly or indirectly, pay or cause to be paid any consideration,
whether by way of interest, fee or otherwise, to any holder of any Notes for or
as an inducement to any consent, waiver or amendment of any of the terms or
provisions of the Indenture or the Notes unless such consideration is offered to
be paid or agreed to be paid to all holders of the
 
                                       68
<PAGE>   74
 
Notes that consent, waive or agree to amend in the time frame set forth in the
solicitation documents relating to such consent, waiver or agreement.
 
EVENTS OF DEFAULT AND REMEDIES
 
     The Indenture provides that each of the following constitutes an Event of
Default:
 
          (i) default in payment when due of interest on or Liquidated Damages,
     if any, with respect to the Notes as to any interest payment date falling
     on or prior to October 1, 2000, and default for 30 days in payment when due
     of interest on, or Liquidated Damages, if any, with respect to, the Notes
     as to any interest payment date thereafter;
 
          (ii) default in payment when due of principal or premium, if any, on
     the Notes at maturity, upon redemption or otherwise;
 
          (iii) failure by the Company to perform or comply with the provisions
     of the covenants described above under "-- Offer to Purchase Upon Change of
     Control," "-- Asset Sales," "-- Restricted Payments," "-- Incurrence of
     Indebtedness and Issuance of Disqualified Stock" or "-- Merger,
     Consolidation or Sale of Assets;"
 
          (iv) failure by the Company for 30 days after notice to the Company
     from the Trustee or to the Company and the Trustee by the holders of at
     least 25% in principal amount of the Notes then outstanding to comply with
     its other agreements in the Indenture or the Notes;
 
          (v) default under any mortgage, indenture or instrument under which
     there may be issued or by which there may be secured or evidenced any
     Indebtedness for money borrowed by the Company or any of its Restricted
     Subsidiaries (or the payment of which is guaranteed by the Company or any
     of its Restricted Subsidiaries), whether such Indebtedness or Guarantee now
     exists, or is created after the Issue Date, which default (x) is caused by
     a failure to pay when due principal, premium, if any, or interest on such
     Indebtedness within the grace period provided in such Indebtedness (a
     "Payment Default"), and the principal amount of any such Indebtedness,
     together with the principal amount of any other such Indebtedness of the
     Company or any Significant Subsidiary under which there has been a Payment
     Default or the maturity of which has been accelerated as provided in clause
     (y), aggregates $5.0 million or more or (y) results in the acceleration
     (which acceleration has not been rescinded) of such Indebtedness prior to
     its express maturity and the principal amount of any such Indebtedness,
     together with the principal amount of any other such Indebtedness under
     which there has been a Payment Default or the maturity of which has been so
     accelerated, aggregates $5.0 million or more;
 
          (vi) failure by the Company or any of its Significant Subsidiaries to
     pay final judgments (other than any judgment as to which a reputable
     insurance company has accepted full liability in writing) aggregating in
     excess of $5.0 million which judgments are not paid, discharged or stayed
     within 45 days after their entry; and
 
          (vii) certain events of bankruptcy or insolvency with respect to the
     Company or any of its Significant Subsidiaries.
 
     In addition to the foregoing, it shall be an Event of Default under the
Indenture if any of the provisions of the Indenture relating to the Security
Documents or the Security Documents shall cease to be in full force and effect
or shall cease to give the secured parties the Liens, rights, powers and
privileges purported to be created thereby.
 
     If any Event of Default occurs and is continuing under the Indenture, the
Trustee, by notice to the Company, or the holders of at least 25% in principal
amount of the then outstanding Notes, by notice to the Company and the Trustee,
may declare all the Notes to be due and payable immediately. Upon such
declaration, the principal of, premium, if any, and accrued and unpaid interest
and Liquidated Damages, if any, on the Notes shall be due and payable
immediately. Notwithstanding the foregoing, in the case of an Event of Default
arising from certain events of bankruptcy or insolvency with respect to the
Company or any of its Significant Subsidiaries, the foregoing amount shall ipso
facto become due and payable without further
 
                                       69
<PAGE>   75
 
action or notice. No premium is payable upon acceleration of the Notes except
that in the case of an Event of Default that is the result of an action or
inaction by the Company or any of its Restricted Subsidiaries intended to avoid
restrictions on or premiums related to redemptions of the Notes contained in the
Indenture or the Notes, the amount declared due and payable will include the
premium that would have been applicable on a voluntary prepayment of the Notes
or, if voluntary prepayment is not then permitted, the premium set forth in the
Indenture. Holders of the Notes may not enforce the Indenture or the Notes
except as provided in the Indenture. Subject to certain limitations, holders of
a majority in principal amount of the then outstanding Notes may direct the
Trustee in its exercise of any trust or power. The Trustee may withhold from
holders of the Notes notice of any continuing Default or Event of Default
(except a Default or Event of Default relating to the payments of principal or
interest) if it determines that withholding notice is in such holders' interest.
 
     The holders of a majority in aggregate principal amount of the Notes then
outstanding, by notice to the Trustee, may, on behalf of the holders of all of
the Notes, waive any existing Default or Event of Default and its consequences
under the Indenture, except a continuing Default or Event of Default in the
payment of interest or Liquidated Damages or premium on, or the principal of,
the Notes.
 
     The Company is required to deliver to the Trustee annually a statement
regarding compliance with the Indenture, and the Company is required upon
becoming aware of any Default or Event of Default to deliver to the Trustee a
statement specifying such Default or Event of Default.
 
NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES AND STOCKHOLDERS
 
     No director, officer, employee, incorporator or stockholder of the Company,
as such, shall have any liability for any obligations of the Company under the
Notes or the Indenture or for any claim based on, in respect of, or by reason of
such obligations or their creation. Each holder of Notes by accepting a Note
waives and releases all such liability. The waiver and release are part of the
consideration for issuance of the Notes. Such waiver may not be effective to
waive liabilities under the federal securities laws and it is the view of the
Commission that such a waiver is against public policy.
 
LEGAL DEFEASANCE AND COVENANT DEFEASANCE
 
     The Company may, at its option and at any time, elect to have its
obligations discharged with respect to the outstanding Notes and have the liens
and security interests created by the Security Agreement released ("Legal
Defeasance"). Such Legal Defeasance means that the Company shall be deemed to
have paid and discharged the entire indebtedness represented by the outstanding
Notes, except for:
 
          (a) the rights of holders of outstanding Notes to receive from the
     trust described below payments in respect of the principal of, premium, if
     any, and interest on and Liquidated Damages with respect to such Notes when
     such payments are due, or on the redemption date, as the case may be;
 
          (b) the Company's obligations with respect to the Notes concerning
     issuing temporary Notes, registration of Notes, mutilated, destroyed, lost
     or stolen Notes and the maintenance of an office or agency for payment and
     money for security payments held in trust;
 
          (c) the rights, powers, trust, duties and immunities of the Trustee,
     and the Company's obligations in connection therewith; and
 
          (d) the Legal Defeasance provisions of the Indenture.
 
     In addition, the Company may, at its option and at any time, elect to have
the obligations of the Company released with respect to certain covenants that
are described in the Indenture and have the liens and security interests created
by the Security Agreement released ("Covenant Defeasance") and thereafter any
omission to comply with such obligations shall not constitute a Default or Event
of Default with respect to the Notes. In the event Covenant Defeasance occurs,
certain events (not including nonpayment, bankruptcy, receivership,
rehabilitation and insolvency events) described under "Events of Default" will
no longer constitute an Event of Default with respect to the Notes.
 
                                       70
<PAGE>   76
 
     In order to exercise either Legal Defeasance or Covenant Defeasance:
 
          (i) the Company must irrevocably deposit with the Trustee, in trust,
     for the benefit of the holders of the Notes, cash in U.S. dollars,
     non-callable U.S. government obligations, or a combination thereof, in such
     amounts as will be sufficient (after taking into account the amount, if
     any, remaining in the Pledge Account), in the opinion of a nationally
     recognized firm of independent public accountants selected by the Company,
     to pay the principal of, premium, if any, and interest on and Liquidated
     Damages with respect to the outstanding Notes, on the stated maturity or on
     the applicable optional redemption date, as the case may be, of such
     principal or installment of principal of, premium, if any, or interest on
     or Liquidated Damages with respect to the outstanding Notes;
 
          (ii) in the case of Legal Defeasance, the Company must deliver to the
     Trustee an opinion of counsel in the United States reasonably acceptable to
     the Trustee confirming that (A) the Company has received from, or there has
     been published by, the Internal Revenue Service a ruling or (B) since the
     Issue Date, there has been a change in the applicable federal income tax
     law, in either case to the effect that, and based thereon such opinion of
     counsel shall confirm that, the holders of the outstanding Notes will not
     recognize income, gain or loss for federal income tax purposes as a result
     of such Legal Defeasance and will be subject to federal income tax on the
     same amounts, in the same manner and at the same times as would have been
     the case if such Legal Defeasance had not occurred;
 
          (iii) in the case of Covenant Defeasance, the Company must deliver to
     the Trustee an opinion of counsel in the United States reasonably
     acceptable to the Trustee confirming that the holders of the outstanding
     Notes will not recognize income, gain or loss for federal income tax
     purposes as a result of such Covenant Defeasance and will be subject to
     federal income tax on the same amounts, in the same manner and at the same
     times as would have been the case if such Covenant Defeasance had not
     occurred;
 
          (iv) no Default or Event of Default shall have occurred and be
     continuing on the date of such deposit (other than a Default or Event of
     Default resulting from the borrowing of funds to be applied to such
     deposit) or insofar as Events of Default from bankruptcy or insolvency
     events are concerned, at any time in the period ending on the 91st day
     after the date of deposit;
 
          (v) such Legal Defeasance or Covenant Defeasance will not result in a
     breach or violation of, or constitute a default under any material
     agreement or instrument (other than the Indenture) to which the Company or
     any of its Subsidiaries is a party or by which the Company or any of its
     Subsidiaries is bound;
 
          (vi) the Company must have delivered to the Trustee an opinion of
     counsel to the effect that after the 91st day (or such other applicable
     date) following the deposit, the trust funds will not be subject to the
     effect of any applicable bankruptcy, insolvency, reorganization or similar
     laws affecting creditors' rights generally;
 
          (vii) the Company must deliver to the Trustee an Officers' Certificate
     stating that the deposit was not made by the Company with the intent of
     preferring the holders of Notes over the other creditors of the Company
     with the intent of defeating, hindering, delaying or defrauding creditors
     of the Company or others; and
 
          (viii) the Company must deliver to the Trustee an Officers'
     Certificate and an opinion of counsel, each stating that all conditions
     precedent provided for in the Indenture relating to the Legal Defeasance or
     the Covenant Defeasance have been complied with.
 
TRANSFER AND EXCHANGE
 
     A holder may transfer or exchange Notes in accordance with the Indenture.
The Registrar and the Trustee may require a holder, among other things, to
furnish appropriate endorsements and transfer documents and the Company may
require a holder to pay any taxes and fees required by law or permitted by the
Indenture. The Company is not required to transfer or exchange any Note selected
for redemption. Also, the Company is not required to transfer or exchange any
Note for a period of 15 days before a selection of Notes to be redeemed.
 
                                       71
<PAGE>   77
 
     The registered holder of a Note will be treated as the owner of it for all
purposes.
 
AMENDMENT, SUPPLEMENT AND WAIVER
 
     Except as provided in the next succeeding paragraph, the Indenture or the
Notes may be amended or supplemented with the consent of the holders of at least
a majority in principal amount of the Notes then outstanding (including consents
obtained in connection with a tender offer or exchange offer for Notes), and any
existing default or compliance with any provision of the Indenture or the Notes
may be waived with the consent of the holders of a majority in principal amount
of the then outstanding Notes (including consents obtained in connection with a
tender offer or exchange offer for Notes).
 
     Without the consent of each holder affected, however, an amendment or
waiver may not (with respect to any Note held by a non-consenting holder):
 
          (i) reduce the principal amount of Notes whose holders must consent to
     an amendment, supplement or waiver;
 
          (ii) reduce the principal or change the fixed maturity of any Note or
     alter the provisions with respect to the redemption of the Notes (other
     than provisions relating to the covenants described under the caption
     "-- Offer to Purchase upon Change of Control" and "-- Offer to Purchase
     with Excess Asset Sale Proceeds");
 
          (iii) reduce the rate of or change the time for payment of interest on
     any Notes;
 
          (iv) waive a Default or Event of Default in the payment of principal
     of or premium, if any, or interest on the Notes (except a rescission of
     acceleration of the Notes by the holders of at least a majority in
     aggregate principal amount of the Notes and a waiver of the payment default
     that resulted from such acceleration);
 
          (v) make any Note payable in money other than that stated in the
     Notes;
 
          (vi) make any change in the provisions of the Indenture relating to
     waivers of past Defaults or the rights of holders of Notes to receive
     payments of principal of, premium, if any, or interest on the Notes;
 
          (vii) waive a redemption payment with respect to any Note (other than
     a payment required by one of the covenants described above under the
     captions "-- Offer to Purchase upon Change of Control" and "-- Offer to
     Purchase with Excess Asset Sale Proceeds");
 
          (viii) make any change in the foregoing amendment and waiver
     provisions; or
 
          (ix) amend the Pledge Agreement or the Security Agreement or otherwise
     affect the interests of any Holder in the Pledged Securities or the
     Collateral, in each case in any manner that adversely affects the rights of
     any Holder or the Trustee.
 
     Notwithstanding the foregoing, without the consent of any holder of Notes,
the Company and the Trustee may amend or supplement the Indenture or the Notes:
 
          (a) to cure any ambiguity, defect or inconsistency;
 
          (b) to provide for uncertificated Notes in addition to or in place of
     certificated Notes;
 
          (c) to provide for the assumption of the Company's obligations to
     holders of the Notes in the case of a merger or consolidation;
 
          (d) to make any change that would provide any additional rights or
     benefits to the holders of the Notes or that does not adversely affect the
     legal rights under the Indenture of any such holder; or
 
          (e) to comply with requirements of the Commission in order to effect
     or maintain the qualification of the Indenture under the Trust Indenture
     Act.
 
                                       72
<PAGE>   78
 
CONCERNING THE TRUSTEE
 
     The Indenture contains certain limitations on the rights of the Trustee,
should the Trustee become a creditor of the Company, to obtain payment of claims
in certain cases, or to realize on certain property received in respect of any
such claim as security or otherwise. The Trustee will be permitted to engage in
other transactions with the Company; however, if the Trustee acquires any
conflicting interest, it must eliminate such conflict within 90 days, apply to
the Commission for permission to continue as Trustee or resign.
 
     The holders of a majority in principal amount of the then outstanding Notes
will have the right to direct the time, method and place of conducting any
proceeding for exercising any remedy available to the Trustee, subject to
certain exceptions. The Indenture will provide that in case an Event of Default
shall occur and be continuing, the Trustee will be required, in the exercise of
its powers, to use the degree of care of a prudent man in the conduct of his own
affairs. Subject to such provisions, the Trustee will be under no obligation to
exercise any of its rights or powers under the Indenture, the Pledge Agreement
or the Security Agreement at the request of any holder of Notes, unless such
holder shall have offered to the Trustee security and indemnity satisfactory to
it against any loss, liability or expense. No holder of any Note will have any
right to institute any proceeding with respect to the Indenture, the Pledge
Agreement or the Security Agreement or for any remedy under any thereof, unless
(i) such holder gives to the Trustee written notice of a continuing Event of
Default, (ii) holders of at least 25% in principal amount of the then
outstanding Notes make a written request to pursue the remedy, (iii) such
holders of the Notes provide to the Trustee satisfactory indemnity and (iv) the
Trustee does not comply within 60 days. Otherwise, no holder of any Note will
have any right to institute any proceeding with respect to the Indenture, the
Pledge Agreement or the Security Agreement or for any remedy under any thereof,
except: (i) a holder of a Note may institute suit for enforcement of payment of
the principal of and premium, if any, or interest on or Liquidated Damages with
respect to such Note on or after the respective due dates expressed in such Note
(including upon acceleration thereof) or (ii) the institution of any proceeding
with respect to the Indenture, the Pledge Agreement or the Security Agreement or
any remedy under any thereof, including without limitation acceleration, by the
holders of a majority in principal amount of the outstanding Notes, provided
that, upon institution of any proceeding or exercise of any remedy such holders
provide the Trustee with prompt notice thereof.
 
REGISTRATION RIGHTS; LIQUIDATED DAMAGES
 
     The Company and the Initial Purchasers have entered into the Registration
Rights Agreement on September 29, 1997. Pursuant to the Registration Rights
Agreement, the Company has agreed to file with the Commission the Exchange Offer
Registration Statement on the appropriate form under the Securities Act. Upon
the effectiveness of the Exchange Offer Registration Statement, the Company will
offer to the holders of Transfer Restricted Securities pursuant to the Exchange
Offer who are able to make certain representations the opportunity to exchange
their Transfer Restricted Securities for a new issue of senior notes of the
Company (the "Exchange Notes") registered under the Securities Act, with terms
substantially identical to those of the Notes. If (i) the Company is not
required to file the Exchange Offer Registration Statement or permitted to
consummate the Exchange Offer because the Exchange Offer is not permitted by
applicable law or Commission policy or (ii) any holder of Transfer Restricted
Securities notifies the Company within the specified time period that (A) it is
prohibited by law or Commission policy from participating in the Exchange Offer,
(B) that it may not resell the Exchange Notes acquired by it in the Exchange
Offer to the public without delivering a prospectus and the prospectus contained
in the Exchange Offer Registration Statement is not appropriate or available for
such resales or (C) that it is a broker-dealer and owns Notes acquired directly
from the Company or an affiliate of the Company, the Company will file with the
Commission a Shelf Registration Statement to cover resales of the Notes by the
holders thereof who satisfy certain conditions relating to the provision of
information in connection with the Shelf Registration Statement. The Company
will use its best efforts to cause the applicable registration statement to be
declared effective as promptly as possible by the Commission. For purposes of
the foregoing, "Transfer Restricted Securities" means each Note until (i) the
date on which such has been exchanged by a Person other than a broker-dealer for
an Exchange Note in the Exchange Offer, (ii) following the exchange by a
broker-dealer in the Exchange Offer of a Note for an Exchange Note, the date on
which such an Exchange Note is sold to a purchaser who receives from
 
                                       73
<PAGE>   79
 
such broker-dealer on or prior to the date of such sale a copy of the prospectus
contained in the Exchange Offer Registration Statement, (iii) the date on which
such Note has been effectively registered under the Securities Act and disposed
of in accordance with the Shelf Registration Statement or (iv) the date on which
such Note is distributed to the public pursuant to Rule 144 under the Securities
Act.
 
     The Registration Rights Agreement provides that (i) the Company will file
an Exchange Offer Registration Statement with the Commission on or prior to 30
days after the Closing Date, (ii) the Company will use its best efforts to have
the Exchange Offer Registration Statement declared effective by the Commission
on or prior to 120 days after the Closing Date, (iii) unless the Exchange Offer
would not be permitted by applicable law or Commission policy, the Company will
commence the Exchange Offer and use its best efforts to issue, on or prior to 30
business days after the date on which the Exchange Offer Registration Statement
was declared effective by the Commission, Exchange Notes in exchange for all
Notes tendered prior thereto in the Exchange Offer and (iv) if obligated to file
the Shelf Registration Statement, the Company will use its best efforts to file
the Shelf Registration Statement with the Commission on or prior to 30 days
after such filing obligation arises (and in any event within 150 days after the
Closing Date) and to cause the Shelf Registration to be declared effective by
the Commission on or prior to 90 days after such obligation arises (and in any
event within 240 days after the Closing Date). If (a) the Company fails to file
any of the Registration Statements required by the Registration Rights Agreement
on or before the date specified for such filing, (b) any of such Registration
Statements is not declared effective by the Commission on or prior to the date
specified for such effectiveness (the "Effectiveness Target Date"), (c) the
Company fails to consummate the Exchange Offer within 30 business days of the
Effectiveness Target Date with respect to the Exchange Offer Registration
Statement, or (d) the Shelf Registration Statement or the Exchange Offer
Registration Statement is declared effective but thereafter ceases to be
effective or usable in connection with resales of Transfer Restricted Securities
during the periods specified in the Registration Rights Agreement, (each such
event referred to in clauses (a) through (d) above a "Registration Default"),
then the Company will pay Liquidated Damages to each holder of Transfer
Restricted Securities, with respect to the first 90-day period immediately
following the occurrence of such Registration Default in an amount equal to $.05
per week per $1,000 principal amount of Notes constituting Transfer Restricted
Securities held by such holder. The amount of the Liquidated Damages will
increase by an additional $.05 per week per $1,000 principal amount of Notes
constituting Transfer Restricted Securities with respect to each subsequent
90-day period until all Registration Defaults have been cured, up to a maximum
amount of Liquidated Damages of $.50 per week per $1,000 principal amount of
Notes constituting Transfer Restricted Securities. All accrued Liquidated
Damages will be paid by the Company on each Interest Payment Date. Following the
cure of all Registration Defaults, the accrual of Liquidated Damages will cease.
 
     Holders of Notes will be required to make certain representations to the
Company (as described in the Registration Rights Agreement) in order to
participate in the Exchange Offer and will be required to deliver information to
be used in connection with the Shelf Registration Statement and to provide
comments on the Shelf Registration Statement within the time periods set forth
in the Registration Rights Agreement in order to have their Notes included in
the Shelf Registration Statement and benefit from the provisions regarding
Liquidated Damages set forth above.
 
ADDITIONAL INFORMATION
 
   
     Anyone who receives this Prospectus may obtain a copy of the Indenture, the
Registration Rights Agreement, the Pledge Agreement and the Security Agreement
without charge by writing to the Company at 3301 N. Buffalo Drive, Las Vegas,
Nevada 89129, Attention: General Counsel.
    
 
CERTAIN DEFINITIONS
 
     Set forth below are certain defined terms used in the Indenture. Reference
is made to the Indenture for a full disclosure of all such terms, as well as any
other capitalized terms used herein for which no definition is provided.
 
                                       74
<PAGE>   80
 
     "Acquired Debt" means, with respect to any specified Person, (i)
Indebtedness of any other Person existing at the time such other Person is
merged with or into or became a Restricted Subsidiary of such specified Person,
including, without limitation, Indebtedness incurred in connection with, or in
contemplation of, such other Person merging with or into or becoming a
Restricted Subsidiary of such specified Person, and (ii) Indebtedness secured by
a Lien encumbering any asset acquired by such specified Person.
 
     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control"
(including, with correlative meanings, the terms "controlling," "controlled by"
and "under common control with"), as used with respect to any Person, shall mean
the possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of such Person, whether through the
ownership of voting securities, by agreement or otherwise, provided, however,
that beneficial ownership of 25% or more of the voting securities of a Person
shall be deemed to be control.
 
     "Attributable Debt" means, with respect to any Sale and Leaseback
Transaction, the present value at the time of determination (discounted at a
rate consistent with accounting guidelines, as determined in good faith by the
Company) of the payments during the remaining term of the lease (including any
period for which such lease has been extended or may, at the option of the
lessor, be extended) or until the earliest date on which the lessee may
terminate such lease without penalty or upon payment of a penalty (in which case
the rental payments shall include such penalty), after excluding all amounts
required to be paid on account of maintenance and repairs, insurance, taxes,
assessments, water, utilities and similar charges.
 
     "Beneficial Owner" means a beneficial owner as defined in Rules 13d-3 and
13d-5 under the Exchange Act (or any successor rules), including the provision
of such Rules that a Person shall be deemed to have beneficial ownership of all
securities that such Person has a right to acquire within 60 days; provided that
a Person will not be deemed a beneficial owner of, or to own beneficially, any
securities if such beneficial ownership (1) arises solely as a result of a
revocable proxy delivered in response to a proxy or consent solicitation made
pursuant to, and in accordance with, the Exchange Act and (2) is not also then
reportable on Schedule 13D or Schedule 13G (or any successor schedule) under the
Exchange Act.
 
     "Capital Lease Obligation" means, at the time any determination thereof is
to be made, the amount of the liability in respect of a capital lease that would
at such time be so required to be capitalized on the balance sheet in accordance
with GAAP.
 
     "Capital Stock" means (i) in the case of a corporation, corporate stock,
(ii) in the case of an association or business entity, any and all shares,
interests, participations, rights or other equivalents (however designated) of
corporate stock and (iii) in the case of a partnership, partnership interests
(whether general or limited) and any other interest or participation that
confers on a Person the right to receive a share of the profits and losses of,
or distributions of assets of, such partnership.
 
     "Change of Control" means the occurrence of any of the following: (i) the
sale, lease, transfer, conveyance or other disposition, in one or a series of
related transactions, of all or substantially all of the assets of the Company
and its Restricted Subsidiaries, taken as a whole, to any Person or group (as
such term is used in Section 13(d)(3) and 14(d)(2) of the Exchange Act), (ii)
the adoption of a plan relating to the liquidation or dissolution of the
Company, (iii) any Person or group (as defined above) other than the Permitted
Holders is or becomes the Beneficial Owner, directly or indirectly, of more than
50% of the total Voting Stock or Total Common Equity of the Company, including
by way of merger, consolidation or otherwise or (iv) the first day on which a
majority of the members of the Board of Directors of the Company are not
Continuing Directors.
 
     "Closing Date" means September 29, 1997.
 
     "Closing Price" on any Trading Day with respect to the per share price of
any shares of Capital Stock means the last reported sale price regular way or,
in case no such reported sale takes place on such day, the average of the
reported closing bid and asked prices regular way, in either case on the New
York Stock Exchange or, if such shares of Capital Stock are not listed or
admitted to trading on such exchange, on the principal national securities
exchange on which such shares are listed or admitted to trading or, if not
listed or
 
                                       75
<PAGE>   81
 
admitted to trading on any national securities exchange, on the Nasdaq National
Market or, if such shares are not listed or admitted to trading on any national
securities exchange or quoted on Nasdaq National Market but the issuer is a
Foreign Issuer (as defined in Rule 3b-4(b) under the Exchange Act) and the
principal securities exchange on which such shares are listed or admitted to
trading is a Designated Offshore Securities Market (as defined in Rule 902(a)
under the Securities Act), the average of the reported closing bid and asked
prices regular way on such principal exchange, or, if such shares are not listed
or admitted to trading on any national securities exchange or quoted on Nasdaq
National Market and the issuer and principal securities exchange do not meet
such requirements, the average of the closing bid and asked prices in the
over-the-counter market as furnished by any New York Stock Exchange member firm
that is selected from time to time by the Company for that purpose and is
reasonably acceptable to the Trustee.
 
     "Common Stock" of any Person means Capital Stock of such Person that does
not rank prior, as to the payment of dividends or as to the distribution of
assets upon any voluntary or involuntary liquidation, dissolution or winding up
of such Person, to shares of Capital Stock of any other class of such Person.
 
     "Common Stock Commitment" means the binding commitment of certain investors
to purchase shares of Common Stock of the Company at a price to be agreed upon
by the Company and such investors, which price shall be not less than $3.50 per
share nor more than $5.00 per share, for an aggregate purchase price of $15.0
million if the Preferred Stock Offering has not been consummated before the
sixtieth day following the Issue Date.
 
     "Consolidated Cash Flow Leverage Ratio" with respect to any Person means
the ratio of the Consolidated Indebtedness of such Person to the Consolidated
EBITDA of such Person for the relevant period; provided, however, that (1) if
the Company or any Restricted Subsidiary of the Company has incurred any
Indebtedness (including Acquired Debt) or if the Company has issued any
Disqualified Stock or if any Restricted Subsidiary of the Company has issued any
Preferred Stock since the beginning of such period that remains outstanding on
the date of such determination or if the transaction giving rise to the need to
calculate the Consolidated Cash Flow Leverage Ratio is an incurrence of
Indebtedness (including Acquired Debt) or the issuance of Disqualified Stock by
the Company, Consolidated EBITDA and Consolidated Indebtedness for such period
will be calculated after giving effect on a pro forma basis to (A) such
Indebtedness, Disqualified Stock or Preferred Stock, as applicable, as if such
Indebtedness had been incurred or such stock had been issued on the first day of
such period, (B) the discharge of any other Indebtedness repaid, repurchased,
defeased or otherwise discharged with the proceeds of such new Indebtedness or
sale of stock as if such discharge had occurred on the first day of such period,
and (C) the interest income realized by the Company or its Restricted
Subsidiaries on the proceeds of such Indebtedness or of such stock sale, to the
extent not yet applied at the date of determination, assuming such proceeds
earned interest at the rate in effect on the date of determination from the
first day of such period through such date of determination, (2) if since the
beginning of such period the Company or any Restricted Subsidiary of the Company
has made any sale of assets (including, without limitation, any Asset Sales or
pursuant to any Sale and Leaseback Transaction), Consolidated EBITDA for such
period will be (A) reduced by an amount equal to Consolidated EBITDA (if
positive) directly attributable to the assets which are the subject of such sale
of assets for such period or (B) increased by an amount equal to Consolidated
EBITDA (if negative) directly attributable thereto for such period and (3) if
since the beginning of such period the Company or any Restricted Subsidiary of
the Company (by merger or otherwise) has made an Investment in any Restricted
Subsidiary of the Company (or any Person which becomes a Restricted Subsidiary
of the Company) or has made an acquisition of assets, including, without
limitation, any acquisition of assets occurring in connection with a transaction
causing a calculation of Consolidated EBITDA to be made hereunder, which
constitutes all or substantially all of an operating unit of a business,
Consolidated EBITDA for such period will be calculated after giving pro forma
effect thereto (including the incurrence of any Indebtedness (including Acquired
Debt)) as if such Investment or acquisition occurred on the first day of such
period. For purposes of this definition, whenever pro forma effect is to be
given to an acquisition of assets, the pro forma calculations will be determined
in good faith by a responsible financial or accounting Officer of the Company,
provided, however, that such Officer shall assume (i) the historical sales and
gross profit margins associated with such assets for any consecutive 12-month
period ended prior to the date of purchase (provided that the first month of
such
 
                                       76
<PAGE>   82
 
12-month period will be no more than 18 months prior to such date of purchase)
and (ii) other expenses as if such assets had been owned by the Company since
the first day of such period. If any Indebtedness (including, without
limitation, Acquired Debt) bears a floating rate of interest and is being given
pro forma effect, the interest on such Indebtedness will be calculated as if the
rate in effect on the date of determination had been the applicable rate for the
entire period.
 
     "Consolidated EBITDA" as of any date of determination means the
Consolidated Net Income for such period (but without giving effect to
adjustments, accruals, deductions or entries resulting from purchase accounting,
extraordinary losses or gains and any gains or losses from any Asset Sales),
plus the following to the extent deducted in calculating such Consolidated Net
Income: (i) provision for taxes based on income or profits of such Person and
its Subsidiaries or, in the case of the Company, its Restricted Subsidiaries for
such period, (ii) Consolidated Interest Expense, (iii) depreciation,
amortization (including amortization of goodwill and other intangibles) and
other non-cash charges (excluding any such non-cash charge to the extent that it
represents an accrual of or reserve for cash charges in any future period or
amortization of a prepaid cash expense that was paid in a prior period and
excluding non-cash interest and dividend income) of such Person and its
Subsidiaries or, in the case of the Company, its Restricted Subsidiaries for
such period, in each case, on a consolidated basis and determined in accordance
with GAAP. Notwithstanding the foregoing, the provision for taxes on the income
or profits of, and the depreciation, amortization, interest expense and other
non-cash charges of, a Subsidiary or, in the case of the Company, a Restricted
Subsidiary of the referent Person shall be added to Consolidated Net Income to
compute Consolidated EBITDA only to the extent (and in same proportion) that the
Net Income of such Subsidiary or, in the case of the Company, such Restricted
Subsidiary was included in calculating the Consolidated Net Income of such
Person and only if a corresponding amount would be permitted at the date of
determination to be dividended to the Company by such Subsidiary, or, in the
case of the Company, such Restricted Subsidiary or loaned to the Company by any
such Subsidiary, or, in the case of the Company any such Restricted Subsidiary
without prior approval (that has not been obtained), pursuant to the terms of
its charter and all agreements, instruments, judgments, decrees, orders,
statutes, rules and governmental regulations applicable to such Subsidiary or,
in the case of the Company, any such Restricted Subsidiary or its stockholders.
 
     "Consolidated Indebtedness" means, with respect to any Person, as of any
date of determination, the aggregate amount of Indebtedness of such Person and
its Subsidiaries or, in the case of the Company, its Restricted Subsidiaries as
of such date calculated on a consolidated basis in accordance with GAAP
consistently applied.
 
     "Consolidated Interest Expense" means, for any Person, for any period, the
aggregate of the following for such Person for such period determined on a
consolidated basis in accordance with GAAP: (a) the amount of interest in
respect of Indebtedness (including amortization of original issue discount,
amortization of debt issuance costs, and non-cash interest payments on any
Indebtedness, the interest portion of any deferred payment obligation and after
taking into account the effect of elections made under any Interest Rate
Agreement, however denominated with respect to such Indebtedness), (b) the
amount of Redeemable Dividends (to the extent not already included in
Indebtedness in determining Consolidated Interest Expense for the relevant
period) and (c) the interest component of rentals in respect of any Capital
Lease Obligation paid, in each case whether accrued or scheduled to be paid or
accrued by such Person during such period to the extent such amounts were
deducted in computing Consolidated Net Income, determined on a consolidated
basis in accordance with GAAP. For purposes of this definition interest on a
Capital Lease Obligation shall be deemed to accrue at an interest rate
reasonably determined by such Person to be the rate of interest implicit in such
Capital Lease Obligation in accordance with GAAP consistently applied.
 
     "Consolidated Net Income" means, with respect to any Person for any period,
the aggregate of the Net Income of such Person and its Subsidiaries or, in the
case of the Company, its Restricted Subsidiaries for such period, on a
consolidated basis, determined in accordance with GAAP; provided that:
 
          (i) the Net Income of any Person that is not a Subsidiary or, in the
     case of the Company, a Restricted Subsidiary or that is accounted for by
     the equity method of accounting shall be included only
 
                                       77
<PAGE>   83
 
     to the extent of the amount of dividends or distributions paid in cash to
     the referent Person or a Subsidiary or, in the case of the Company, a
     Restricted Subsidiary thereof,
 
          (ii) the Net Income of any Subsidiary or, in the case of the Company,
     any Restricted Subsidiary shall be excluded to the extent that the
     declaration or payment of dividends or other distributions by that
     Subsidiary, or Restricted Subsidiary, as the case may be, of that Net
     Income is not at the date of determination permitted without any prior
     governmental approval (which has not been obtained) or, directly or
     indirectly, by operation of the terms of its charter or any agreement,
     instrument, judgment, decree, order, statute, rule or governmental
     regulation applicable to that Subsidiary or Restricted Subsidiary, as the
     case may be, or its stockholders,
 
          (iii) the Net Income of any Person acquired in a pooling of interests
     transaction for any period prior to the date of such acquisition shall be
     excluded,
 
          (iv) the cumulative effect of a change in accounting principles shall
     be excluded, and
 
          (v) the Net Income of any Unrestricted Subsidiary shall be excluded,
     whether or not distributed to the Company or one of its Restricted
     Subsidiaries.
 
     "Consolidated Net Worth" means the total amount shown on the balance sheet
of the Company and its consolidated Restricted Subsidiaries, determined on a
consolidated basis in accordance with GAAP, as of the end of the most recent
fiscal quarter of the Company for which internal financial statements are then
available, prior to the taking of any action for the purpose of which the
determination is being made, as (i) the par or stated value of all outstanding
Capital Stock of the Company plus (ii) paid-in capital or capital surplus
relating to such Capital Stock plus (iii) any retained earnings or earned
surplus less (a) any accumulated deficit and (b) any amounts attributable to
Disqualified Stock.
 
     "Contingent Investment" means, with respect to any Person, any guarantee by
such Person of the performance of another Person or any commitment by such
Person to invest in another Person. Any Investment that consists of a Contingent
Investment shall be deemed made at the time that the guarantee of performance or
the commitment to invest is given, and the amount of such Investment shall be
the maximum monetary obligation under such guarantee of performance or
commitment to invest. To the extent that a Contingent Investment is released or
lapses without payment under the guarantee of performance or the commitment to
invest, such Investment shall be deemed not made to the extent of such release
or lapse. With respect to any Contingent Investment, the payment of the
guarantee of performance or the payment under the commitment to invest shall not
be deemed to be an additional Investment.
 
     "Continuing Directors" means, as of any date of determination, any member
of the Board of Directors of the Company who (i) was a member of such Board of
Directors on the Issue Date or (ii) was nominated for election or elected to
such Board of Directors with the affirmative vote of a majority of the
Continuing Directors who were members of such Board at the time of such
nomination or election.
 
     "Credit Facility" means any credit facility entered into by and among the
Company and one or more commercial banks or financial institutions, providing
for senior term or revolving credit borrowings of a type similar to credit
facilities typically entered into by commercial banks and financial
institutions, including any related notes, Guarantees, collateral documents,
instruments and agreements executed in connection therewith, as such credit
facility and related agreements may be amended, extended, refinanced, renewed,
restated, replaced or refunded from time to time.
 
     "Default" means any event that is or with the passage of time or the giving
of notice or both would be an Event of Default.
 
     "Disqualified Stock" means any Capital Stock to the extent that, and only
to the extent that, by its terms (or by the terms of any security into which it
is convertible or for which it is exchangeable), or upon the happening of any
event, matures or is mandatorily redeemable, pursuant to a sinking fund
obligation or otherwise, or is redeemable at the option of the holder thereof,
in whole or in part, on or prior to the date on which the Notes mature,
provided, however, that any Capital Stock which would not constitute
Disqualified Stock but for provisions thereof giving holders thereof the right
to require the Company to repurchase or
 
                                       78
<PAGE>   84
 
redeem such Capital Stock upon the occurrence of a Change of Control occurring
prior to the final maturity of the Notes shall not constitute Disqualified Stock
if the change in control provisions applicable to such Capital Stock are no more
favorable to the holders of such Capital Stock than the provisions applicable to
the Notes contained in the covenant described under "-- Offer to Purchase Upon a
Change of Control" and such Capital Stock specifically provides that the Company
will not repurchase or redeem any such stock pursuant to such provisions prior
to the Company's repurchase of such Notes as are required to be repurchased
pursuant to the covenant described under "-- Offer to Purchase Upon Change of
Control."
 
     "Eligible Institution" means a commercial banking institution that has
combined capital and surplus of not less than $500.0 million or its equivalent
in foreign currency, whose debt is rated "A" (or higher) according to S&P or
Moody's at the time as of which any investment or rollover therein is made.
 
     "Eligible Receivable" means any Receivable not more than 90 days past due
under its scheduled payment terms.
 
     "Equity Interests" means Capital Stock and all warrants, options or other
rights to acquire Capital Stock or that are measured by the value of Capital
Stock (but excluding any debt security that is convertible into or exchangeable
for Capital Stock).
 
     "Equity Offering" means an underwritten offering of Capital Stock (other
than Disqualified Stock) of the Company registered under the Securities Act.
 
     "Exchange Act" means the Securities Exchange Act of 1934, as amended (or
any successor act), and the rules and regulations thereunder.
 
     "Existing Indebtedness" means all Indebtedness of the Company and its
Restricted Subsidiaries in existence on the Issue Date.
 
     "Fair Market Value" means with respect to any asset or property, the sale
value that would be obtained in an arm's length transaction between an informed
and willing seller under no compulsion to sell and an informed and willing buyer
under no compulsion to buy.
 
     "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as may be approved by a significant segment of the accounting
profession of the United States, which are in effect on the Issue Date.
 
     "Government Securities" means direct obligations of, or obligations
guaranteed by, the United States of America for the payment of which guarantee
or obligations the full faith and credit of the United States is pledged.
 
     "Guarantee" means a guarantee (other than by endorsement of negotiable
instruments for collection in the ordinary course of business), direct or
indirect, in any manner (including, without limitation, letters of credit and
reimbursement agreements in respect thereof), of all or any part of any
Indebtedness.
 
     "Hedging Obligations" means, with respect to any Person, the obligations of
such Person under Interest Rate Agreements.
 
     "ILEC" means the incumbent local exchange carrier.
 
     "Indebtedness" means, with respect to any Person, any indebtedness of such
Person, whether or not contingent, in respect of borrowed money or evidenced by
bonds, notes, debentures or similar instruments or letters of credit (or
reimbursement agreements in respect thereof) or representing the balance
deferred and unpaid of the purchase price of any property (including pursuant to
capital leases) or representing any Hedging Obligations, except any such balance
that constitutes an accrued expense or trade payable, if and to the extent any
of the foregoing (other than Hedging Obligations or letters of credit) would
appear as a liability upon a balance sheet of such Person prepared in accordance
with GAAP, all indebtedness of others secured by a Lien on any asset of such
Person (whether or not such indebtedness is assumed by such Persons), all
 
                                       79
<PAGE>   85
 
obligations to purchase, redeem, retire, defease or otherwise acquire for value
any Disqualified Stock or any warrants, rights or options to acquire such
Disqualified Stock valued, in the case of Disqualified Stock, at the greatest
amount payable in respect thereof on a liquidation (whether voluntary or
involuntary) plus accrued and unpaid dividends, the liquidation value of any
Preferred Stock issued by Subsidiaries of such Person or by Restricted
Subsidiaries of the Company, as the case may be, plus accrued and unpaid
dividends, and also includes, to the extent not otherwise included, the
Guarantee of items that would be included within this definition and any
amendment, supplement, modification, deferral, renewal, extension or refunding
of any of the above; notwithstanding the foregoing, in no event will performance
bonds or similar security for performance be deemed Indebtedness so long as such
performance bonds or similar security for performance would not appear as a
liability on a balance sheet of such Person prepared in accordance with GAAP;
and provided further, that the amount of any Indebtedness in respect of any
Guarantee shall be the maximum principal amount of the Indebtedness so
guaranteed.
 
     "Independent Appraiser" means a nationally recognized accounting, appraisal
or investment banking firm experienced in the review of similar types of
transactions which does not have, and whose directors, officers and employees or
Affiliates do not have, a direct or indirect financial interest in the Affiliate
Transaction and which, in the opinion of the Board of Directors, is otherwise
independent and qualified to perform the task for which it is to be engaged.
 
     "Interest Rate Agreements" means (i) interest rate swap agreements,
interest rate cap agreements and interest rate collar agreements and (ii) other
agreements or arrangements designed to protect such Person against fluctuations
in interest rates.
 
     "Investments" means, with respect to any Person, all investments by such
Person in other Persons (including Affiliates) in the forms of loans,
Guarantees, Contingent Investments, advances or capital contributions (excluding
commission, travel and similar advances to officers and employees made in the
ordinary course of business), purchases or other acquisitions for consideration
of Indebtedness, Equity Interests or other securities of any other Person and
all other items that are or would be classified as investments on a balance
sheet prepared in accordance with GAAP; provided, however, that any investment
to the extent made with Capital Stock of the Company (other than Disqualified
Stock) shall not be deemed an "Investment" for purposes of the Indenture.
 
     "Issue Date" means September 29, 1997.
 
     "Joint Venture" means a Person in the Telecommunications Business in which
the Company holds less than a majority of the shares of Voting Stock or an
Unrestricted Subsidiary in the Telecommunications Business.
 
     "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset,
whether or not filed, recorded or otherwise perfected under applicable law
(including any conditional sale or other title retention agreement, any lease in
the nature thereof, any option or other agreement to sell or give a security
interest in and any filing of or agreement to give any financing statement under
the Uniform Commercial Code (or equivalent statutes) of any jurisdiction).
 
     "Marketable Securities" means:
 
          (i) Government Securities;
 
          (ii) any certificate of deposit maturing not more than 270 days after
     the date of acquisition issued by, or time deposit of, an Eligible
     Institution;
 
          (iii) commercial paper maturing not more than 270 days after the date
     of acquisition issued by a corporation (other than an Affiliate of the
     Company) with a rating at the time as of which any investment therein is
     made, of "A-1" (or higher) according to S&P or "P-1" (or higher) according
     to Moody's;
 
          (iv) any banker's acceptances or money market deposit accounts issued
     or offered by an Eligible Institution; and
 
                                       80
<PAGE>   86
 
          (v) any fund investing exclusively in investments of the types
     described in clauses (i) through (iv) above.
 
     "Moody's" means Moody's Investors Service, Inc. and its successors.
 
     "Net Income" means, with respect to any Person, the net income (loss) of
such Person, determined in accordance with GAAP and before any reduction in
respect of preferred stock dividends, excluding, however, (i) any gain (but not
loss), together with any related provision for taxes on such gain (but not
loss), realized in connection with (a) any Asset Sale (including, without
limitation, dispositions pursuant to Sale and Leaseback Transactions) or (b) the
disposition of any securities by such Person or any of its Subsidiaries or, in
the case of the Company, any of its Restricted Subsidiaries or the
extinguishment of any Indebtedness of such Person or any of its Subsidiaries or,
in the case of the Company, any of its Restricted Subsidiaries and (ii) any
extraordinary gain (but not loss), together with any related provision for taxes
on such extraordinary gain (but not loss).
 
     "Net Proceeds" means the aggregate cash proceeds received by the Company or
any of its Restricted Subsidiaries in respect of any Asset Sale, net of the
direct costs relating to such Asset Sale (including, without limitation, legal,
accounting and investment banking fees, and sales commissions) and any
relocation expenses incurred as a result thereof, taxes paid or payable as a
result thereof (after taking into account any available tax credits or
deductions and any tax sharing arrangements), amounts required to be applied to
the repayment of Indebtedness secured by a Lien on the asset or assets that are
the subject of such Asset Sale and any reserve for adjustment in respect of the
sale price of such asset or assets. Net Proceeds shall exclude any non-cash
proceeds received from any Asset Sale, but shall include such proceeds when and
as converted by the Company or any Restricted Subsidiary of the Company to cash.
 
     "Pari Passu Notes" means any notes issued by the Company which, by their
terms and the terms of any indenture governing such notes, have an obligation to
be repurchased by the Company upon the occurrence of an Asset Sale.
 
     "Permitted Holder" means (i) Circle F Ventures, LLC or any of its
Affiliates, (ii) any of Maurice J. Gallagher, Jr., Timothy P. Flynn, Robert L.
Priddy or Nield J. Montgomery or their respective spouses or lineal descendants
and their respective spouses (collectively, the "Individual Family Holders")
whether acting in their own name or as a majority of persons having the power to
exercise the voting rights attached to, or having investment power over, shares
held by others, (iii) any Affiliate of any member of the Individual Family
Holders, (iv) any trust principally for the benefit of one or more members of
the Individual Family Holders (whether or not any member of the Individual
Family Holders is a trustee of such trust) and (v) any charitable foundation
whose majority of members, trustees or directors, as the case may be, are
persons referred to in (ii) above.
 
     "Permitted Investment" means (a) any Investments in the Company or any
Restricted Subsidiary of the Company; (b) any Investments in Marketable
Securities; (c) Investments by the Company or any Restricted Subsidiary of the
Company in a Person, if as a result of such Investment (i) such Person becomes a
Restricted Subsidiary of the Company or (ii) such Person is merged, consolidated
or amalgamated with or into, or transfers or conveys substantially all of its
assets to, or is liquidated into, the Company or a Restricted Subsidiary of the
Company; (d) any Investments in property or assets to be used in (A) any line of
business in which the Company or any of its Restricted Subsidiaries was engaged
on the Issue Date or (B) any Telecommunications Business; (e) up to $20.0
million at any one time outstanding in Investments in Joint Ventures, provided,
however, that Investments in Joint Ventures which are not also Unrestricted
Subsidiaries shall not exceed $10.0 million at any one time outstanding; (f)
Investments pursuant to any agreement or obligation of the Company or a
Restricted Subsidiary, in effect on the Issue Date or on the date a Subsidiary
becomes a Restricted Subsidiary (provided that any such agreement was not
entered into in contemplation of such Subsidiary becoming a Restricted
Subsidiary), to make such Investments; (g) Investments in prepaid expenses,
negotiable instruments held for collection and lease, utility and workers'
compensation, performance and other similar deposits; (h) Hedging Obligations
permitted to be incurred by the covenant entitled "Incurrence of Indebtedness
and Issuance of Preferred Stock"; (i) bonds, notes, debentures or other
securities received as a result of Asset Sales permitted under the covenant
entitled "Asset Sales"; and (j) loans and
 
                                       81
<PAGE>   87
 
advances to employees and officers of the Company or any of its Restricted
Subsidiaries permitted under the covenant entitled "Transactions with
Affiliates."
 
     "Permitted Liens" means (i) Liens securing Indebtedness (including Capital
Lease Obligations) permitted to be incurred pursuant to clauses (a) and (b) of
the second paragraph of the covenant entitled "Incurrence of Indebtedness and
Issuance of Preferred Stock"; (ii) Liens in favor of the Company; (iii) Liens on
property of a Person existing, at the time such Person is merged into or
consolidated with the Company or any Restricted Subsidiary of the Company;
provided that such Liens were not incurred in contemplation of such merger or
consolidation and do not extend to any assets other than those of the Person
merged into or consolidated with the Company; (iv) Liens on property existing at
the time of acquisition thereof by the Company or any Restricted Subsidiary of
the Company, provided that such Liens were in existence prior to the
contemplation of such acquisition; (v) Liens to secure the performance of
statutory obligations, surety or appeal bonds, performance bonds or other
obligations of a like nature incurred in the ordinary course of business; (vi)
Liens existing, on the Issue Date; (vii) Liens for taxes, assessments or
governmental charges or claims that are not yet delinquent or that are being
contested in good faith by appropriate proceedings timely instituted and
diligently concluded, provided that any reserve or other appropriate provision
as shall be required in conformity with GAAP shall have been made therefor;
(viii) Liens incurred in the ordinary course of business of the Company or any
Restricted Subsidiary of the Company with respect to obligations that do not
exceed $3.0 million at any one time outstanding and that (a) are not incurred in
connection with the borrowing of money or the obtaining of advances or credit
(other than trade credit in the ordinary course of business) and (b) do not in
the aggregate materially detract from the value of the property or materially
impair the use thereof in the operation of business by the Company or such
Restricted Subsidiary; (ix) Liens on Telecommunications Related Assets existing
during the time of the construction thereof; (x) Liens on Receivables to secure
Indebtedness permitted to be incurred by the covenant entitled "Incurrence of
Indebtedness and Issuance of Preferred Stock," but only to the extent that the
outstanding amount of the Indebtedness secured by such Liens would not represent
more than 80% of Eligible Receivables; (xi) Liens on Telecommunications
Equipment required to be incurred pursuant to the covenant entitled "Security
Interests"; and (xii) Liens to secure any Permitted Refinancing of any
Indebtedness secured by Liens referred to in the foregoing clauses (i), (iii),
(iv), (v), (vi) or (x); but only to the extent that such Liens do not extend to
any other property or assets and the principal amount of the Indebtedness
secured by such Liens is not increased by more than the fees and expenses
incurred in connection with such refinancing.
 
     "Person" means any individual, corporation, partnership, joint venture,
association, joint stock company, trust, unincorporated organization, government
or any agency or political subdivision thereof or any other entity.
 
     "Pledge Account" means an account established with the Trustee pursuant to
the terms of the Pledge Agreement for the deposit of the Pledged Securities
purchased by the Company with a portion of the proceeds from the sale of the
Notes.
 
     "Pledge Agreement" means the Collateral Pledge and Security Agreement,
dated as of the date of the Indenture, by and between the Trustee and the
Company, governing the disbursement of funds from the Pledge Account.
 
     "Pledged Securities" means the securities purchased by the Company with a
portion of the proceeds from the sale of the Notes, which shall consist of
Government Securities, to be deposited in the Pledge Account.
 
     "Preferred Stock" as applied to the Capital Stock of any Person, means
Capital Stock of such Person of any class or classes (however designated) that
ranks prior, as to payment of dividends or as to the distribution of assets upon
any voluntary or involuntary liquidation, dissolution or winding up of such
Person, to shares of Capital Stock of any other class of such Person.
 
     "Preferred Stock Offering" means the offering of Convertible Preferred
Stock of the Company to generate aggregate gross proceeds of at least $15.0
million.
 
     "Qualified Equity Offering" means an Equity Offering in which the net
proceeds to the Company are not less than $25.0 million.
 
                                       82
<PAGE>   88
 
     "Receivables" means, with respect to any Person, all of the following
property and interests in property of such person or entity, whether now
existing or existing in the future or hereafter acquired or arising: (i)
accounts; (ii) accounts receivable, including, without limitation, all rights to
payment created by or arising from sales of goods, leases of goods or the
rendition of services no matter how evidenced, whether or not earned by
performance; (iii) all unpaid seller's or lessor's rights including, without
limitation, rescission, replevin, reclamation and stoppage in transit, relating
to any of the foregoing after creation of the foregoing or arising therefrom;
(iv) all rights to any goods or merchandise represented by any of the foregoing,
including, without limitation, returned or repossessed goods; (v) all reserves
and credit balances with respect to any such accounts receivable or account
debtors; (vi) all letters of credit, security, or Guarantees for any of the
foregoing; (vii) all insurance policies or reports relating to any of the
foregoing; (viii) all collection of deposit accounts relating to any of the
foregoing; (ix) all proceeds of any of the foregoing; and (x) all books and
records relating to any of the foregoing.
 
     "Redeemable Dividend" means, for any dividend with regard to Disqualified
Stock and Preferred Stock, the quotient of the dividend divided by the
difference between one and the maximum statutory federal income tax rate
(expressed as a decimal number between 1 and 0) then applicable to the issuer of
such Disqualified Stock or Preferred Stock.
 
     "Registration Rights Agreement" means the Registration Rights Agreement
between the Company and the Initial Purchasers.
 
     "Restricted Investment" means an Investment other than a Permitted
Investment.
 
     "Restricted Payment Credit" means the sum of (i) any cash received by the
Company as repayment of a Restricted Payment and (ii) the lesser of (x) the net
book value of any Restricted Investment at the time it becomes a Permitted
Investment, (y) the fair market value of such Restricted Investment at the time
it becomes a Permitted Investment and (z) the original fair market value of such
Restricted Investment at the time it was made.
 
     "Restricted Subsidiary" means any subsidiary of the Company that is not
designated by the Board of Directors as an Unrestricted Subsidiary.
 
     "Sale and Leaseback Transaction" means, with respect to any Person, any
direct or indirect arrangement pursuant to which any property (other than
Capital Stock) is sold by such Person or a Subsidiary, or, in the case of the
Company, a Restricted Subsidiary of such Person and is thereafter leased back
from the purchaser or transferee thereof by such Person or one of its
Subsidiaries or, in the case of the Company, one of its Restricted Subsidiaries.
 
     "Security Agreement" means the Security Agreement, dated as of the date of
the Indenture, by and between the Company and the Trustee, as collateral agent.
 
     "Security Documents" means the Security Agreement and any other agreements,
instruments or documents entered into or delivered in connection with the
Security Agreement, as such agreements, instruments or documents may from time
to time be amended in accordance with their terms.
 
     "Senior Indebtedness" means any Indebtedness permitted to be incurred by
the Company under the terms of the Indenture, unless the instrument under which
such Indebtedness is incurred expressly provides that it is subordinated in
right of payment to the Notes. Notwithstanding anything to the contrary in the
foregoing, Senior Indebtedness will not include (i) any liability for federal,
state, local or other taxes owed or owing by the Company, (ii) any Indebtedness
of the Company to any of its Subsidiaries or other Affiliates, (iii) any trade
payables or (iv) any Indebtedness that is incurred in violation of the
Indenture.
 
     "Significant Subsidiary" means (i) any Restricted Subsidiary that would be
a "Significant Subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X,
promulgated pursuant to the Securities Act, as such Regulation is in effect on
the date hereof and (ii) any Subsidiary which holds any permit or license which
is material to the operations of the Company and its Restricted Subsidiaries
taken as a whole.
 
                                       83
<PAGE>   89
 
     "Subsidiary" of any Person means (i) any corporation, association or
business entity of which more than 50% of the total voting power of shares of
Capital Stock entitled (without regard to the occurrence of any contingency) to
vote in the election of directors, managers or trustees thereof is at the time
owned or controlled, directly or indirectly, by such Person or one or more of
the other Subsidiaries of such Person or a combination thereof and (ii) any
partnership (a) the sole general partner or the managing general partner of
which is such Person or a Subsidiary of such Person or (b) the only general
partners of which are such Person or one or more Subsidiaries of such Person or
any combination thereof.
 
     "Telecommunications Business" means, when used in reference to any Person,
that such Person is engaged primarily in the business of (i) transmitting, or
providing services relating to the transmission of, voice, video or data through
owned or leased transmission facilities and (ii) creating, developing or
marketing communications related network equipment, software and other devices
for use in a Telecommunications Business.
 
     "Telecommunications Equipment" means telecommunications switches and
related equipment and inventory, including, without limitation, all remote
switching nodes, modems, line cards, transport hardware and equipment or
hardware necessary to install and operate the telecommunications switches.
 
     "Telecommunications Related Assets" means all assets, rights (contractual
or otherwise) and properties, whether tangible or intangible, real or personal,
used or to be used, in connection with a Telecommunications Business.
 
     "Total Common Equity" of any Person means, as of any date of determination
the product of (i) the aggregate number of outstanding primary shares of Common
Stock of such Person on such day (which shall not include any options or
warrants on, or securities convertible or exchangeable into, shares of Common
Stock of such Person) and (ii) the average Closing Price of such Common Stock
over the 20 consecutive Trading Days immediately preceding such day. If no such
Closing Price exists with respect to shares of any such class, the value of such
shares for purposes of clause (ii) of the preceding sentence shall be determined
by the Board of Directors of the Company in good faith and evidenced by a
resolution of the Board of Directors filed with the Trustee.
 
     "Trading Day," with respect to a securities exchange or automated quotation
system, means a day on which such exchange or system is open for a full day of
trading.
 
     "Unrestricted Subsidiary" means any Subsidiary that is designated by the
Board of Directors as an Unrestricted Subsidiary pursuant to a resolution of the
Board of Directors.
 
     "Vendor Indebtedness" means any Indebtedness of the Company or any
Restricted Subsidiary incurred in connection with the acquisition or
construction of Telecommunications Related Assets.
 
     "Voting Stock" of any Person means Capital Stock of such Person which
ordinarily has voting power for the election of directors (or Persons performing
similar functions) of such Person, whether at all times or only so long as no
senior class of securities has such voting power by reason of any contingency.
 
     "Weighted Average Life to Maturity" means, when applied to any Indebtedness
at any date, the number of years obtained by dividing (a) the then outstanding
principal amount of such Indebtedness into (b) the total of the product obtained
by multiplying (x) the amount of each then remaining installment, sinking fund,
serial maturity or other required payments of principal, including payment at
final maturity, in respect thereof, by (y) the number of years (calculated to
the nearest one-twelfth) that will elapse between such date and the making of
such payment; provided, that with respect to Capital Lease Obligations, that
maturity shall be calculated after giving effect to all renewal options by the
lessee.
 
                                       84
<PAGE>   90
 
                             UNITED STATES FEDERAL
                INCOME TAX CONSEQUENCES OF THE EXCHANGE OF NOTES
 
     The following summary of all material federal income tax consequences of
the exchange of Notes is based on the opinion of Ellis, Funk, Goldberg, Labovitz
& Dokson, P.C., counsel to the Company, which opinion has been filed as an
exhibit to the Registration Statement. Such opinion is based upon the provisions
of the Internal Revenue Code of 1986, as amended (the "Code"), the final,
temporary and proposed regulations promulgated thereunder, and administrative
rulings and judicial decisions in effect as of the date hereof, all of which are
subject to change (possibly with retroactive effect) or different
interpretations. The following summary is not binding on the Internal Revenue
Service ("IRS") and there can be no assurance that the IRS will take a similar
view with respect to the tax consequences described below. No ruling has been or
will be requested by the Company from the IRS on any tax matters relating to the
Notes or the Exchange Offer. This discussion is for general information only and
does not purport to address the possible federal income tax consequences or any
state, local or foreign tax consequences of the acquisition, ownership and
disposition of the Notes or the Exchange Notes other than the exchange of
Outstanding Notes for Exchange Notes in this Exchange Offer.
 
     This summary deals only with holders that hold Notes as capital assets and
does not address tax considerations applicable to investors that may be subject
to special tax rules, such as banks, tax exempt organizations, insurance
companies, dealers in securities or currencies, persons that hold Notes as a
position in a "straddle" for tax purposes, persons that hold Notes that are a
hedge or that are hedged against currency risks or that are part of a conversion
transaction, or persons that have a "functional currency" other than the U.S.
dollar. HOLDERS SHOULD CONSULT THEIR OWN TAX ADVISORS WITH RESPECT TO THE
APPLICATION OF THE FEDERAL INCOME AND ESTATE TAX LAWS TO THEIR PARTICULAR
SITUATIONS AS WELL AS ANY TAX CONSEQUENCES ARISING UNDER THE LAWS OF ANY STATE,
LOCAL OR FOREIGN TAXING JURISDICTION.
 
   
     Subject to the foregoing, the opinion of Ellis, Funk, Goldberg, Labovitz &
Dokson, P.C. states that: (1) The exchange of the Outstanding Notes for Exchange
Notes pursuant to the Exchange Offer will not be treated as an "exchange"
because the Exchange Notes will not be considered to differ materially in kind
or extent from the Outstanding Notes. (2) Rather, the Exchange Notes received by
a holder of the Outstanding Notes will be treated as a continuation of the
Outstanding Notes in the hands of such holder. (3) As a result, there will be no
federal income tax consequences to holders exchanging the Outstanding Notes for
the Exchange Notes pursuant to the Exchange Offer.
    
 
                              PLAN OF DISTRIBUTION
 
     Based on positions taken by the staff of the Commission set forth in
no-action letters issued to Exxon Capital Holdings Corp. and Morgan Stanley &
Co. Inc., among others, the Company believes that Exchange Notes issued pursuant
to the Exchange Offer in exchange for Outstanding Notes may be offered for
resale, resold and otherwise transferred by holders thereof (other than any
holder which is (i) an "affiliate" of the Company within the meaning of Rule 405
under the Securities Act, (ii) a broker-dealer who acquired Notes directly from
the Company, or (iii) broker-dealers who acquired Notes as a result of
market-making or other trading activities) without compliance with the
registration and prospectus delivery provisions for the Securities Act provided
that such Exchange Notes are acquired in the ordinary course of such holders'
business, and such holders are not engaged in, and do not intend to engage in,
and have no arrangement or understanding with any person to participate in, a
distribution of such Exchange Notes; provided that broker-dealers
("Participating Broker-Dealers") receiving Exchange Notes in the Exchange Offer
will be subject to a prospectus delivery requirement with respect to resales of
such Exchange Notes. To date, the staff of the Commission has taken the position
that Participating Broker-Dealers may fulfill their prospectus delivery
requirements with respect to transactions involving an exchange of securities
such as the exchange pursuant to the Exchange Offer (other than a resale of an
unsold allotment from the sale of the Outstanding Notes to the Initial
Purchasers thereof) with the Prospectus contained in the Exchange Offer
Registration Statement. Pursuant to the Registration Rights Agreement, the
Company has agreed to permit Participating Broker-
 
                                       85
<PAGE>   91
 
Dealers and other persons, if any, subject to similar prospectus delivery
requirements to use this Prospectus in connection with the resale of such
Exchange Notes. The Company has agreed that, for a period of 365 days after the
effective date of the Registration Statement, it will make this Prospectus, and
any amendment or supplement to this Prospectus, available to any broker-dealer
that requests such documents.
 
     Each holder of Outstanding Notes who wishes to exchange its Outstanding
Notes for Exchange Notes in the Exchange Offer will be required to make certain
representations to the Company as set forth in "The Exchange Offer -- Terms and
Conditions of the Letter of Transmittal." In addition, each holder who is a
broker-dealer and who receives Exchange Notes for its own account in exchange
for Outstanding Notes that were acquired by it as a result of market-making
activities or other trading activities, will be required to acknowledge that it
will deliver a prospectus in connection with any resale by it of such Exchange
Notes.
 
     Holders who tender Outstanding Notes in the Exchange Offer with the
intention to participate in a distribution of the Exchange Notes may not rely
upon the Morgan Stanley or similar no-action letters.
 
     The Company will not receive any proceeds from any sale of Exchange Notes
by broker-dealers. Exchange Notes received by broker-dealers for their own
account pursuant to the Exchange Offer may be sold from time to time in one or
more transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on the Exchange Notes or a combination of such
methods of resale, at market prices prevailing at the time of resale, at prices
related to such prevailing market prices or at negotiated prices. Any such
resale may be made directly to purchasers or to or through brokers or dealers
who may receive compensation in the form of commissions or concessions from any
such broker-dealer and/or the purchasers of any such Exchange Notes. The Letter
of Transmittal states that by acknowledging that it will deliver and by
delivering a prospectus, a broker-dealer will not be deemed to admit that it is
an "underwriter" within the meaning of the Securities Act.
 
     The Company has agreed to pay all expenses incidental to the Exchange Offer
other than commissions and concessions of any brokers or dealers and will
indemnify holders of the Outstanding Notes (including any broker-dealers)
against certain liabilities, including liabilities under the Securities Act, as
set forth in the Registration Rights Agreement.
 
                                 LEGAL MATTERS
 
     Certain legal matters regarding the validity of the Exchange Notes offered
hereby and the United States federal income tax consequences of the Exchange
Offer will be passed upon for the Company by Ellis, Funk, Goldberg, Labovitz &
Dokson, P.C., Atlanta, Georgia. Certain shareholders of Ellis, Funk, Goldberg,
Labovitz & Dokson, P.C. own approximately 60,000 shares of common stock of the
Company.
 
                                    EXPERTS
 
     The financial statements of the Company as of December 31, 1996 and 1995
and for the year ended December 31, 1996, have been included herein and in the
Registration Statement in reliance upon the report of KPMG Peat Marwick LLP,
independent certified accountants, appearing elsewhere herein, and upon the
authority of said firm as experts in accounting and auditing.
 
                                       86
<PAGE>   92
 
                         INDEX TO FINANCIAL STATEMENTS
 
                            MGC COMMUNICATIONS, INC.
 
   
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Independent Auditors' Report................................   F-2
Balance Sheets as of September 30, 1997 (unaudited) and
  December 31, 1996 and 1995................................   F-3
Statements of Operations for the nine months ended September
  30, 1997 and 1996 (unaudited) and for the year ended
  December 31, 1996.........................................   F-4
Statements of Stockholders' Equity for the nine months ended
  September 30, 1997 (unaudited) and for the year ended
  December 31, 1996.........................................   F-5
Statements of Cash Flows for the nine months ended September
  30, 1997 and 1996 (unaudited) and for the year ended
  December 31, 1996.........................................   F-6
Notes to Financial Statements...............................   F-7
</TABLE>
    
 
                                       F-1
<PAGE>   93
 
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors
MGC Communications, Inc.:
 
   
     We have audited the accompanying balance sheets of MGC Communications, Inc.
as of December 31, 1996 and 1995 and the related statements of operations,
stockholders' equity and cash flows for the year ended December 31, 1996. The
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.
    
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
   
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of MGC Communications, Inc. as
of December 31, 1996 and 1995, and the results of its operations and its cash
flows for the year ended December 31, 1996, in conformity with generally
accepted accounting principles.
    
 
                                                           KPMG PEAT MARWICK LLP
 
Las Vegas, Nevada
August 18, 1997
 
                                       F-2
<PAGE>   94
 
                            MGC COMMUNICATIONS, INC.
   
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)
    
 
                                 BALANCE SHEETS
 
   
<TABLE>
<CAPTION>
                                                                               DECEMBER 31,
                                                              SEPTEMBER 30,   --------------
                                                                  1997         1996     1995
                                                              -------------   -------   ----
                                                               (UNAUDITED)
<S>                                                           <C>             <C>       <C>
                                           ASSETS
Current assets:
  Cash and cash equivalents.................................    $ 95,390      $ 7,897   $--
  Restricted investments....................................      18,235           --    --
  Amounts receivable for shares issued......................         400        1,153    --
  Accounts receivable:
    Trade, less allowance for doubtful accounts of $137
      (unaudited) at September 30, 1997.....................         744            1    --
    Other...................................................         394            9    --
                                                                --------      -------   ---
         Total accounts receivable..........................       1,138           10    --
  Prepaid expenses..........................................          66           23    --
                                                                --------      -------   ---
         Total current assets...............................     115,229        9,083    --
Property and equipment, net.................................      18,339        3,250    --
Restricted investments......................................      38,532           --    --
Deferred financing costs....................................       5,870           --    --
Other assets................................................          56            6     1
                                                                --------      -------   ---
         Total assets.......................................    $178,026      $12,339   $ 1
                                                                ========      =======   ===
 
                            LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Current maturities of long-term debt......................    $    390      $    --   $--
  Accounts payable:
    Trade...................................................         923           76    --
    Property and equipment..................................       5,251        1,372    --
  Accrued expenses..........................................         455           99    --
                                                                --------      -------   ---
         Total current liabilities..........................       7,019        1,547    --
                                                                --------      -------   ---
Senior Secured Notes, net of unamortized discount of
  $4,026....................................................     155,974           --    --
Other long-term debt........................................         225           --    --
                                                                --------      -------   ---
         Total liabilities..................................     163,218        1,547    --
Commitments and contingencies
Stockholders' equity:
  Common stock, $0.001 par value, 100,000,000 shares
    authorized, 14,666,000 (unaudited), 11,960,000, and
    400,000 shares issued and outstanding...................          15           12
  Additional paid-in capital................................      22,111       12,271     1
  Accumulated deficit.......................................      (6,630)      (1,491)   --
                                                                --------      -------   ---
                                                                  15,496       10,792     1
  Notes receivable from stockholders for issuance of common
    stock...................................................        (688)          --    --
         Total stockholders' equity.........................      14,808       10,792     1
                                                                --------      -------   ---
         Total liabilities and stockholders' equity.........    $178,026      $12,339   $ 1
                                                                ========      =======   ===
</TABLE>
    
 
                See accompanying notes to financial statements.
 
                                       F-3
<PAGE>   95
 
   
                            MGC COMMUNICATIONS, INC.
    
 
                            STATEMENTS OF OPERATIONS
   
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
    
 
   
<TABLE>
<CAPTION>
                                                                  NINE MONTHS ENDED
                                                                    SEPTEMBER 30,          YEAR ENDED
                                                              -------------------------   DECEMBER 31,
                                                                 1997          1996           1996
                                                              -----------   -----------   ------------
                                                              (UNAUDITED)   (UNAUDITED)
<S>                                                           <C>           <C>           <C>
Telecommunication services:
  Operating revenues........................................    $ 1,924       $   --        $     1
                                                                -------       ------        -------
Operating expenses:
  Cost of operating revenues (excluding depreciation shown
     below).................................................      2,512           44            305
                                                                -------       ------        -------
  Selling, general and administrative.......................      3,954          359            841
  Depreciation and amortization.............................        818           --             54
  Write-off of purchased software...........................         --           --            355
                                                                -------       ------        -------
                                                                  7,284          403          1,555
                                                                -------       ------        -------
          Loss from operations..............................     (5,360)        (403)        (1,554)
 
Other income (expense):
  Interest income...........................................        338           31             63
  Interest expense..........................................       (117)          --             --
          Net loss..........................................    $(5,139)      $ (372)       $(1,491)
                                                                =======       ======        =======
Net loss per share of common stock..........................    $ (0.37)      $(0.40)       $ (1.27)
                                                                =======       ======        =======
Weighted average shares outstanding.........................     13,917          936          1,178
                                                                =======       ======        =======
</TABLE>
    
 
                See accompanying notes to financial statements.
 
                                       F-4
<PAGE>   96
 
                            MGC COMMUNICATIONS, INC.
 
   
                       STATEMENTS OF STOCKHOLDERS' EQUITY
    
   
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
    
 
   
<TABLE>
<CAPTION>
                                                                                                    NOTES
                                                                                                  RECEIVABLE
                                                                                                     FROM
                                                                                                 STOCKHOLDERS
                                             COMMON STOCK                                        FOR ISSUANCE       TOTAL
                             PRICE PER   --------------------   ADDITIONAL PAID-   ACCUMULATED    OF COMMON     STOCKHOLDERS'
                               SHARE       SHARES     AMOUNT       IN CAPITAL        DEFICIT        STOCK          EQUITY
                             ---------   ----------   -------   ----------------   -----------   ------------   -------------
<S>                          <C>         <C>          <C>       <C>                <C>           <C>            <C>
Balance at January 1,
  1996.....................   $0.0025       400,000        --                  1            --           --                 1
Issuance of common stock
  for services contributed
  by stockholder...........   $0.0025       800,000         1                  1            --           --                 2
Issuance of common stock
  for cash.................   $0.50       6,160,000         6              3,074            --           --             3,080
Issuance of common stock
  for cash.................   $2.00       4,600,000         5              9,195            --           --             9,200
Net loss...................                      --        --                 --        (1,491)          --            (1,491)
                                         ----------   -------        -----------   -----------     --------      ------------
Balance at December 31,
  1996.....................              11,960,000        12             12,271        (1,491)          --            10,792
Issuance of common stock
  for cash (unaudited).....   $2.00       2,431,000         3              4,859            --           --             4,862
Issuance of common stock
  for notes receivable
  (unaudited)..............   $2.50         275,000        --                688            --         (688)               --
Proceeds from Senior
  Secured Notes and Warrant
  Offering allocated to
  Warrants, net of expenses
  of $141 (unaudited)......                      --        --              3,884            --           --             3,884
Warrants issued as
  consideration in Senior
  Secured Notes and Warrant
  Offering (unaudited).....  --                  --        --                409            --           --               409
Net loss (unaudited).......  --                  --        --                 --        (5,139)          --            (5,139)
                                         ----------   -------        -----------   -----------     --------      ------------
Balance at September 30,
  1997 (unaudited).........              14,666,000        15             22,111        (6,630)        (688)           14,808
                                         ==========   =======        ===========   ===========     ========      ============
</TABLE>
    
 
                See accompanying notes to financial statements.
 
                                       F-5
<PAGE>   97
 
   
                            MGC COMMUNICATIONS, INC.
    
 
   
                            STATEMENTS OF CASH FLOWS
    
   
                                 (IN THOUSANDS)
    
 
   
<TABLE>
<CAPTION>
                                                                  NINE MONTHS ENDED
                                                                    SEPTEMBER 30,          YEAR ENDED
                                                              -------------------------   DECEMBER 31,
                                                                 1997          1996           1996
                                                              -----------   -----------   ------------
                                                              (UNAUDITED)   (UNAUDITED)
<S>                                                           <C>           <C>           <C>
Cash flows from operating activities:
  Net loss..................................................   $ (5,139)      $  (372)      $(1,491)
  Adjustments to reconcile net loss to net cash used in
     operating activities:
     Depreciation and amortization..........................        818            --            54
     Write-off of purchased software........................         --            --           355
     Stock issued for services rendered.....................         --            --             2
     Changes in assets and liabilities:
       Increase in accounts receivable, net.................     (1,128)       (2,391)           (9)
       Increase in prepaid expenses.........................        (43)          (17)          (23)
       Increase in other assets.............................        (50)          (11)           (5)
       Increase in accounts payable -- trade................        847            --            76
       Increase in accrued expenses.........................        356            19            99
                                                               --------       -------       -------
          Net cash used in operating activities.............     (4,339)       (2,772)         (942)
                                                               --------       -------       -------
Cash flows from investing activities:
  Purchase of property and equipment, net of payables.......    (11,413)         (308)       (2,287)
  Purchase of restricted investments........................    (56,767)           --            --
                                                               --------       -------       -------
          Net cash used in investing activities.............    (68,180)         (308)       (2,287)
                                                               --------       -------       -------
Cash flows from financing activities:
  Proceeds from issuance of Senior Secured Notes and
     warrants...............................................    160,000            --            --
  Costs associated with issuance of Senior Secured Notes and
     warrants of $5,462 and $141, respectively
     (unaudited)............................................     (5,603)           --            --
  Proceeds from issuance of common stock....................      5,615         3,080        11,126
                                                               --------       -------       -------
          Net cash provided by financing activities.........    160,012         3,080        11,126
                                                               --------       -------       -------
          Net increase in cash..............................     87,493            --         7,897
Cash and cash equivalents at beginning of period............      7,897            --            --
                                                               --------       -------       -------
Cash and cash equivalents at the end of period..............   $ 95,390       $    --       $ 7,897
                                                               ========       =======       =======
Non-cash transactions:
  Stock issued for services rendered........................   $     --       $     2       $     2
                                                               ========       =======       =======
  Increase in property and equipment purchases included in
     accounts payable -- property and equipment.............   $  3,879       $    --       $ 1,372
                                                               ========       =======       =======
  Notes payable issued for property and equipment...........   $    615       $    --       $    --
                                                               ========       =======       =======
  Stock issued for notes receivable.........................   $    688       $    --       $    --
                                                               ========       =======       =======
  Warrants issued as consideration in debt and warrant
     offering capitalized as deferred financing costs.......   $    409       $    --       $    --
                                                               ========       =======       =======
</TABLE>
    
 
   
                See accompanying notes to financial statements.
    
 
                                       F-6
<PAGE>   98
 
                            MGC COMMUNICATIONS, INC.
 
   
                         NOTES TO FINANCIAL STATEMENTS
    
 
   
                             SEPTEMBER 30, 1997 AND
    
   
                               DECEMBER 31, 1996
    
   
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
    
 
(1)  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES
 
DESCRIPTION OF BUSINESS
 
   
     MGC Communications, Inc. (the "Company"), a Nevada Corporation, was
organized on October 16, 1995 as a competitive local exchange carrier to provide
low cost alternative local telecommunication services to residential and small
business users through the utilization of Company owned switches and network
architecture leased from incumbent local exchange carriers. The Company's
revenue operations commenced in December 1996. The Company is headquartered in
Las Vegas, Nevada. The Company expects to continue expansion and development of
services and entering into new markets.
    
 
PERIOD FROM OCTOBER 16, 1995 (INCEPTION) TO DECEMBER 31, 1995
 
     Statements of operations and cash flows for the period from October 16,
1995 (inception) to December 31, 1995 have been omitted as no revenues or
expenses were recognized and no cash transactions occurred during the period.
One non-cash transaction occurred during the period ended December 31, 1995 in
which the Company issued 400,000 shares of $.001 par value common stock valued
at $.0025 per share to the founding shareholder as reimbursement for
incorporation costs.
 
   
     As of December 31, 1996, the Company was a development stage company
wherein the Company's activities consisted primarily of raising capital,
acquiring telecommunications equipment, designing and developing the Company's
networks, negotiating agreements with incumbent local exchange carriers for the
utilization of their transport network architecture. The Company began its
operations in December 1996 by operating its first telephone switch in Las
Vegas, Nevada. During the nine months ended September 30, 1997, the Company's
planned principal activities commenced. Therefore, the Company has emerged from
its development stage and the inception to date disclosures have been excluded
from the accompanying financial statements.
    
 
UNAUDITED INTERIM FINANCIAL INFORMATION
 
   
     The financial statements as of and for the nine month periods ending
September 30, 1997 and 1996 are unaudited, but include all adjustments,
consisting of normal recurring accruals, which management considers necessary
for a fair presentation.
    
 
REVENUE RECOGNITION
 
     The Company recognizes operating revenues from telecommunication services
in the period the related services are provided.
 
COST OF OPERATING REVENUES
 
     The Company includes all direct and indirect costs in cost of operating
revenues except depreciation which is reported separately on the statement of
operations.
 
CASH AND CASH EQUIVALENTS
 
     The Company considers short-term investments with a remaining maturity of
three months or less at the date of purchase to be cash equivalents.
 
                                       F-7
<PAGE>   99
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
   
                             SEPTEMBER 30, 1997 AND
    
   
                               DECEMBER 31, 1996
    
   
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
    
 
   
RESTRICTED INVESTMENTS
    
 
   
     Restricted investments represent United States Treasury Notes maturing in
various installments which will be utilized to fund the interest expense on the
Senior Secured Notes as further discussed in Note 3.
    
 
PROPERTY AND EQUIPMENT
 
   
     Property and equipment are carried at cost, less accumulated depreciation.
Depreciation is provided on the straight-line method over the estimated useful
life of the asset, which is generally 3-8 years.
    
 
     The costs of major remodeling and improvements on leased offices are
capitalized as leasehold improvements. Leasehold improvements are depreciated on
the straight-line method over the shorter of the life of the applicable lease or
the useful life of the asset.
 
   
DEFERRED FINANCING COSTS
    
 
   
     Deferred financing costs will be amortized over the life of the related
debt.
    
 
INCOME TAXES
 
   
     Income taxes are accounted for under the asset and liability method.
Deferred tax assets and liabilities are recognized for the future tax
consequences attributable to differences between the financial statement
carrying amounts of existing assets and liabilities and their respective tax
bases and net operating losses. Deferred tax assets and liabilities are measured
using enacted tax rates expected to apply to taxable income in the years in
which those temporary differences are expected to be recovered or settled. The
effect on deferred tax assets and liabilities of a change in tax rates is
recognized in income in the period that includes the enactment date.
    
 
LOSS PER SHARE
 
     Loss per share is computed by dividing net loss by the weighted average
number of common shares outstanding. Usually equivalent shares in the form of
stock options or other common stock equivalents are included in the calculation
only when the effects are dilutive.
 
FAIR VALUE OF FINANCIAL INSTRUMENTS
 
   
     Statement of Financial Accounting Standards No. 107 Disclosure About Fair
Value of Financial Instruments (SFAS 107) requires all entities to disclose the
fair value of financial instruments, both assets and liabilities recognized and
not recognized on the balance sheet, for which it is practicable to estimate
fair value. SFAS 107 defines fair value of a financial instrument as the amount
at which the instrument could be exchanged in a current transaction between
willing parties. At September 30, 1997 and December 31, 1996, the carrying value
of all financial instruments (accounts receivable, accounts payable and
long-term debt) approximates fair value due to the short term nature of these
instruments or interest rates which are comparable with current rates.
    
 
LONG-LIVED ASSETS
 
   
     Management evaluates the carrying value of all long-lived assets to
determine recoverability based generally on an analysis of non-discounted cash
flows. Management believes no material impairment in the value of long-lived
assets exists at September 30, 1997 or December 31, 1996.
    
 
                                       F-8
<PAGE>   100
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
   
                             SEPTEMBER 30, 1997 AND
    
   
                               DECEMBER 31, 1996
    
   
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
    
 
IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS
 
     In February 1997, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards No. 128, Earnings Per Share (SFAS
128), which establishes standards for computing and presenting earnings per
share (EPS). It replaces the presentation of primary and fully diluted EPS with
a presentation of basic and diluted EPS. SFAS 128 is effective for financial
statements for both interim and annual periods ending after December 15, 1997.
Earlier application is not permitted. After adoption, all prior period EPS data
should be restated to conform to SFAS 128.
 
   
     The Company will adopt SFAS 128 in the fourth quarter of 1997. The pro
forma impact of SFAS 128, on the nine months ended September 30, 1997 and the
year ended December 31, 1996, is that basic and diluted EPS would have been
equal to net loss per share of common stock as presented in the respective
statements of operations.
    
 
     In February 1997, the FASB issued Statement of Financial Accounting
Standards No. 129, Disclosure of Information about Capital Structure (SFAS 129).
SFAS 129 establishes standards for disclosing information about an entity's
capital structure. The Company currently complies with the disclosure
requirements of this statement which is effective for periods ending after
December 15, 1997. Implementation will not impact the Company's financial
presentation of its capital structure.
 
   
     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 130, Reporting Comprehensive Income (SFAS 130). SFAS 130 requires companies
to classify items of other comprehensive income by their nature in a financial
statement and display the accumulated balance of other comprehensive income
separately from retained earnings and additional paid-in capital in the equity
sections of a statement of financial position, and is effective for financial
statements issued for fiscal years beginning after December 15, 1997. The
Company is currently assessing the impact on the financial statements for the
nine months ended September 30, 1997 and for the year ended December 31, 1996,
and believes that SFAS 130 will not result in comprehensive income different
from net income as reported in the accompanying financial statements.
    
 
     In June 1997, the FASB issued Statement of Financial Accounting Standards
No. 131, Disclosure About Segments of an Enterprise and Related Information
(SFAS 131). SFAS 131 establishes additional standards for segment reporting in
financial statements and is effective for fiscal years beginning after December
15, 1997. The Company currently operates as one segment.
 
USE OF ESTIMATES
 
     Management of the Company has made a number of estimates and assumptions
relating to the reporting of assets and liabilities and the disclosure of
contingent assets and liabilities to prepare these financial statements in
conformity with generally accepted accounting principles. Actual results could
differ from those estimates.
 
                                       F-9
<PAGE>   101
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
                             SEPTEMBER 30, 1997 AND
                               DECEMBER 31, 1996
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
 
   
(2)  PROPERTY AND EQUIPMENT
    
 
     Property and equipment consist of the following:
 
   
<TABLE>
<CAPTION>
                                                             SEPTEMBER 30,    DECEMBER 31,
                                                                 1997             1996
                                                             -------------    ------------
                                                              (UNAUDITED)
                                                                    (IN THOUSANDS)
<S>                                                          <C>              <C>
Building and property......................................   $      257       $       --
Switching equipment........................................       11,526            2,813
Leasehold improvements.....................................          445              429
Computer hardware and software.............................          593               51
Office equipment...........................................           74               --
                                                              ----------       ----------
                                                                  12,895            3,293
Less accumulated depreciation..............................         (861)             (43)
                                                              ----------       ----------
                                                                  12,034            3,250
Switching equipment under construction.....................        6,305               --
                                                              ----------       ----------
          Net property and equipment.......................   $   18,339       $    3,250
                                                              ==========       ==========
</TABLE>
    
 
   
(3) DEBT
    
 
   
     The Company had no long-term borrowings as of December 31, 1996. Long-term
borrowings at September 30, 1997 consist of the following:
    
 
   
<TABLE>
<CAPTION>
                                                         (IN THOUSANDS)
                                                         --------------
<S>                                                      <C>
13% Senior Secured Notes, due October 1, 2004, net of
  unamortized discount of $4,026.....................       $155,974
10% note payable in monthly installments through
  February 1999......................................            597
Other................................................             18
                                                            --------
                                                             156,589
Less current portion.................................           (390)
                                                            --------
                                                            $156,199
                                                            ========
</TABLE>
    
 
   
     Maturities of long-term debt for each of the next five years consist of the
following:
    
 
   
<TABLE>
<CAPTION>
YEAR ENDING SEPTEMBER 30:                                (IN THOUSANDS)
- -------------------------                                --------------
<S>                                                      <C>
1998.................................................       $    390
1999.................................................            225
2000.................................................             --
2001.................................................             --
2002.................................................             --
2003 and thereafter..................................        155,974
                                                            --------
                                                            $156,589
                                                            ========
</TABLE>
    
 
   
     In September 1997, the Company completed an offering for 160,000 units
consisting of $160 million of 13% Senior Secured Notes ("Notes") due in 2004 and
warrants to purchase 1,291,200 shares of common stock (collectively the
"Offering").
    
 
                                      F-10
<PAGE>   102
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
                             SEPTEMBER 30, 1997 AND
                               DECEMBER 31, 1996
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
 
   
     The Notes bear interest at the rate of 13% per annum, payable semi-annually
in arrears on April 1 and October 1, commencing April 1, 1998. As set forth in
the Indenture Agreement dated September 29, 1997, the Company shall hold in a
trust account sufficient funds to provide for payment in full of interest on the
Notes through October 1, 2000. The accompanying financial statements reflect
approximately $56.8 million as restricted investments as security for the
interest payments on the Notes. In addition, the Notes are secured by a security
interest in certain telecommunications equipment owned by the Company or which
may be acquired in the future. As of September 30, 1997, the Notes were secured
by a security interest in telecommunications equipment with a net book value of
$7.1 million and restricted investments of approximately $56.8 million (at
cost).
    
 
   
     In conjunction with the Offering, the Company engaged an investment banking
firm which determined a value for each warrant and share of common stock.
Consistent with this determination, the Company has allocated a portion of the
Offering proceeds to the warrants based on a value of $2.81 per share of common
stock less the exercise price of $.01 per share for the warrant.
    
 
   
     The warrants are exercisable at any time on or after the earlier to occur
of (i) October 1, 1998, or (ii) the date on which a change in control occurs. As
set forth in the Warrant Agreement, if the preferred stock offering or the
common stock commitment is consummated at a price less than $5.00 per share, the
number of warrants issued will be adjusted to represent 6.4% of the outstanding
common stock on a fully diluted basis. As further discussed in Note 8, the
Company completed the preferred stock offering for $3.50 per share. Accordingly,
the warrants issued in connection with the Offering were increased from
1,291,200 to 1,438,205 and have been reflected in the accompanying financial
statements as of September 30, 1997. Expenses allocated to the warrants in
connection with the Offering were approximately $140,896. The warrants expire on
October 1, 2004.
    
 
   
     In conjunction with the Offering, the Company received binding commitments
from certain investors to purchase common stock for $15 million if a preferred
stock offering had not been consummated within a specified period of time.
Certain investors deposited an aggregate of $15.0 million in escrow, which was
to have been applied to the purchase of common stock in the event the preferred
stock offering was not closed within a specified period of time. As a commitment
fee for the common stock commitment, the Company issued to all such investors
warrants to purchase an aggregate of 150,000 shares of common stock at $.01 per
share. Such warrants will be exercisable at any time prior to October 1, 2004.
The Company has recorded the commitment fee as non-cash consideration in
connection with the Offering. The value of the warrants issued as a commitment
fee was determined based on a value of the Company's common stock at $2.81 per
share less the exercise price of $.01 per share for the warrant.
    
 
   
     The Notes may be redeemed at the option of the Company, in whole or in
part, on or after October 1, 2001, at a premium declining to par in 2003, plus
accrued and unpaid interest and liquidated damages, if any, through the
redemption date as follows:
    
 
   
<TABLE>
<CAPTION>
YEAR                                                        PERCENTAGE
- ----                                                        ----------
<S>                                                         <C>
2001....................................................       106.50
2002....................................................       103.25
2003 and thereafter.....................................       100.00
</TABLE>
    
 
   
     In the event of a sale by the Company prior to October 1, 2000 of its
capital stock in one or more equity offerings, up to a maximum of 35% of the
aggregate principal amount of the Notes originally issued will, at the option of
the Company, be redeemed from the net cash proceeds at a redemption price equal
to 113% of the principal amount, plus accrued and unpaid interest and liquidated
damages, if any, to the redemption date,
    
 
                                      F-11
<PAGE>   103
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
   
                             SEPTEMBER 30, 1997 AND
    
   
                               DECEMBER 31, 1996
    
   
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
    
 
provided at least 65% of the aggregate principal amount of Notes originally
issued remain outstanding immediately after the occurrence of such redemption.
 
   
     The Indenture Agreement contains certain covenants that among other things,
limits the ability of the Company and its restricted subsidiaries to incur
additional indebtedness and issue preferred stock, pay dividends or make other
distributions, repurchase equity interests or subordinated indebtedness, acquire
an aggregate of more than 20 switches until consolidated earnings before
interest, taxes, depreciation and amortization (EBITDA) is positive for two
consecutive quarters (with certain exceptions), engage in sale and leaseback
transactions, create certain liens, enter into certain transactions with
affiliates, sell assets of the Company or its restricted subsidiaries, conduct
certain lines of business, issue or sell equity interests of the Company's
restricted subsidiaries or enter into certain mergers and consolidations.
    
 
   
     Associated with the issuance of the Senior Secured Notes, expenses of
approximately $60,000 were paid to a related party for charter services.
    
 
   
(4)  STOCKHOLDERS' EQUITY
    
 
     On December 6, 1996, the Board of Directors approved a four-hundred-for-one
stock split, effected in the form of a stock dividend distributed on December
31, 1996 to shareholders of record as of June 8, 1996. All share and per share
data presented in the financial statements and notes thereto have been
retroactively restated to give effect to this stock split.
 
   
     During 1995, in exchange for expending cash to incorporate the Company, a
shareholder received 400,000 shares of $.001 par value common stock valued at
the total of cash expended, resulting in an exchange price of $.0025 per share.
The Company capitalized the value of the expended cash as organization costs in
other assets in the accompanying financial statements, which costs are being
amortized over 60 months using the straight-line method of accounting.
    
 
   
     In April 1996, the Company issued 800,000 shares of $.001 par value common
stock for the fair value of services rendered by a stockholder totaling $2,000
resulting in an issuance price of $.0025 per share.
    
 
     During 1996, NevTEL LLC (the "LLC") was formed for the purpose of funding
the development stage of MGC Communications, Inc. In June 1996, the Company and
LLC entered into an agreement whereby LLC would acquire 6,160,000 shares of
$.001 par value common stock of the Company for $.50 per share. The agreement
called for LLC to advance funds for operational expenses incurred by the Company
(to be applied against the purchase price of the stock) until the Company
produced operating revenues, at which time the remaining purchase price would be
remitted to the Company, the Company's common stock would be issued to LLC
owners and LLC would terminate. The agreement stipulated that the funds advanced
for operational expenses were to be paid back to LLC if the Company did not
generate operating revenue by December 31, 1996. The Company began revenue
generating activities in December 1996. The shares were issued to LLC owners on
December 31, 1996, at which time LLC terminated and the remaining purchase price
was owed to the Company. Such amount was transferred to the Company in February
1997 and is classified as amounts receivable for shares issued at December 31,
1996.
 
   
     In December 1996, the Company offered 6,781,000 shares of $.001 par value
common stock at $2.00 per share through a private placement. In connection with
this offering, the Company issued 2,181,000 shares and 4,600,000 shares of $.001
par value common stock and received proceeds of $4,362,000 and $9,200,000 during
the nine months ended September 30, 1997 and the year ended December 31, 1996,
respectively.
    
 
                                      F-12
<PAGE>   104
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
   
                             SEPTEMBER 30, 1997 AND
    
   
                               DECEMBER 31, 1996
    
   
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
    
 
   
     In June 1997, the Company approved agreements with two key members of
management granting them rights to purchase a total of 250,000 shares at $2.00
per share and 275,000 shares at $2.50 per share. In both cases, the Company
retains the right to repurchase these shares at their cost in the event of
termination within a certain period of time and has agreed to finance the
purchase price of the shares purchasable at $2.50 per share over a period of
three years. During September 1997, the members of management exercised their
rights and the respective aforementioned shares were issued. The Company
received $100,000 and $400,000 in September 1997 and October 1997, respectively,
for the 250,000 shares issued at $2.00 per share. The Company has classified in
the accompanying balance sheet as amounts receivable for shares issued $400,000,
which proceeds were received in October 1997 for 200,000 shares. The $688,000
owed to the Company for the 275,000 shares issued at $2.50 per share has been
classified in the accompanying statements of stockholders' equity as notes
receivable from stockholders for issuance of common stock.
    
 
   
     In August 1997, the authorized capital stock of the Company was increased
to 100,000,000 shares of common stock, $.001 par value per share, and 50,000,000
shares of preferred stock, $.001 per value per share. As of September 30, 1997,
no shares of preferred stock have been issued.
    
 
(5)  STOCK OPTION PLAN
 
   
     In June 1996, the Company adopted a stock option plan which allows the
Board of Directors, through the Stock Option Committee, to grant incentives to
employees in the form of incentive stock options and non-qualified stock
options. As of September 30, 1997 and December 31, 1996, the Company has
reserved 2,400,000 shares of common stock to be issued under the plan.
    
 
     Under the plan, substantially all options have been granted to employees at
a price exceeding the then-current market price, as estimated by management, and
vest primarily over a 5-year period. All options expire within ten years of the
date of grant.
 
     Stock option transactions during 1997 and 1996 are as follows:
 
   
<TABLE>
<CAPTION>
                                                               NUMBER         AVERAGE
                                                              OF SHARES    EXERCISE PRICE
                                                              ---------    --------------
<S>                                                           <C>          <C>
Outstanding at December 31, 1995............................         --           --
Granted.....................................................  1,353,100        $0.81
Canceled....................................................    (50,000)       $1.00
                                                              ---------
Outstanding at December 31, 1996............................  1,303,100        $0.81
Granted.....................................................    386,500        $3.94
Canceled....................................................     (6,000)       $3.50
                                                              ---------
Outstanding at September 30, 1997...........................  1,683,600        $1.52
                                                              =========
Exercisable at December 31, 1996............................     19,600        $2.00
                                                              =========
Exercisable at September 30, 1997...........................    276,200        $0.88
                                                              =========
</TABLE>
    
 
     The weighted average fair value of each of the options issued during the
year ended December 31, 1996, substantially all of which have been granted at a
price exceeding the then current market price as estimated by management, was
estimated to be $0.55 using an option pricing model with the following
assumptions: dividend yield of 0%; expected option life of 6.5 years; and risk
free interest rate of 6.12%.
 
                                      F-13
<PAGE>   105
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
   
                             SEPTEMBER 30, 1997 AND
    
   
                               DECEMBER 31, 1996
    
   
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
    
 
     The following table summarizes information about stock options outstanding
at December 31, 1996:
 
<TABLE>
<CAPTION>
                                WEIGHTED
                  NUMBER         AVERAGE     WEIGHTED       NUMBER       WEIGHTED
 RANGE OF     OUTSTANDING AT    REMAINING    AVERAGE    EXERCISABLE AT   AVERAGE
 EXERCISE      DECEMBER 31,    CONTRACTUAL   EXERCISE    DECEMBER 31,    EXERCISE
   PRICE           1996           LIFE        PRICE          1996         PRICE
- -----------   --------------   -----------   --------   --------------   --------
<S>           <C>              <C>           <C>        <C>              <C>
$0.50             700,000      9.25 years     $0.50         --            N/A
$1.00             503,500      9.60 years     $1.00         --            N/A
$2.00              99,600      9.92 years     $2.00         19,600       $2.00
                ---------                                   ------
$0.50-$2.00     1,303,100      9.44 years     $0.81         19,600       $2.00
                =========                                   ======
</TABLE>
 
   
     The Company applied Accounting Principles Board (APB) Opinion No. 25 in
accounting for its plan. No compensation expense was recognized for the nine
months ended September 30, 1997 and for the year ended December 31, 1996. Had
the Company determined compensation cost based on the minimum value method under
SFAS 123, the Company's net loss for the year ended December 31, 1996 would have
increased by approximately $10,000.
    
 
(6)  INCOME TAXES
 
   
     The Company has incurred net operating losses for both financial reporting
and income tax purposes since inception. As of September 30, 1997 and December
31, 1996, the Company has net operating loss carryforwards for income tax
reporting purposes totaling approximately $6,731,000 and $788,000, respectively.
The deferred tax asset arising from such net operating loss carryforward and
temporary differences aggregates approximately $2,668,000 and $557,000 at
September 30, 1997 and December 31, 1996, respectively. A valuation allowance is
provided for amounts of the deferred tax asset for which it cannot be concluded
that future realization is more likely than not. Inasmuch as the Company has not
achieved profitable operations, a valuation allowance of $2,318,000 and $522,000
for September 30, 1997 and December 31, 1996, respectively, has been provided.
    
 
(7)  COMMITMENTS AND CONTINGENCIES
 
LEASE OBLIGATIONS
 
   
     During the year ended December 31, 1996, the Company entered into a lease
agreement for its offices and switching facility in Las Vegas. During the nine
months ended September 30, 1997, the Company entered into lease agreements for
additional offices in Las Vegas and its offices and switching facility in
Atlanta.
    
 
                                      F-14
<PAGE>   106
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
   
                             SEPTEMBER 30, 1997 AND
    
   
                               DECEMBER 31, 1996
    
   
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
    
 
   
     The facility which houses the Company's headquarters in Las Vegas is owned
by two of the Company's principal stockholders and directors. Future minimum
lease obligations in effect as of September 30, 1997 and December 31, 1996 are
as follows:
    
 
   
<TABLE>
<CAPTION>
                                                             SEPTEMBER 30,    DECEMBER 31,
                                                                 1997             1996
                                                             -------------    ------------
                                                              (UNAUDITED)
                                                                    (IN THOUSANDS)
<S>                                                          <C>              <C>
Payments during the year ending December 31:
  1997 (payments through December 31, 1997)................     $   79            $ 67
  1998.....................................................        166              69
  1999.....................................................        152              71
  2000.....................................................        156              74
  2001.....................................................        123              37
  2002.....................................................         88              --
  Thereafter...............................................        429              --
                                                                ------            ----
                                                                $1,193            $318
                                                                ======            ====
</TABLE>
    
 
   
     Rent expense was approximately $134,000 and $33,000 for the nine months
ended September 30, 1997 and the year ended December 31, 1996, respectively.
    
 
   
PURCHASE COMMITMENTS
    
 
   
     In May 1997, the Company signed an agreement to purchase 20 Northern
Telecom DMS-500 switches and related AccessNodes. As of September 30, 1997, the
Company had approximately $40,542,000 of remaining purchase commitments for the
purchase of switching equipment.
    
 
   
     In May 1997, the Company entered into an agreement with Palm Centre Drive,
Inc., the owner of which is a stockholder of the Company, for the purchase of
certain computer software pursuant to which the Company is required to pay the
contract price of $600,000 in six equal monthly installments beginning July 1,
1997. At September 30, 1997, $43,750 is included in accounts payable for
property and equipment related to this agreement. Subsequent to entering into
the agreement, the stockholder became an officer of the Company.
    
 
     In June 1997, in connection with the switching facility in Atlanta, the
Company entered into an agreement for leasehold improvements of approximately
$298,000.
 
   
     In July 1997, in connection with the switching facility in Pomona, the
Company entered into an agreement for building improvements of approximately
$309,000.
    
 
INTERCONNECTION AGREEMENTS
 
     In September 1996, March 1997 and May 1997, the Company signed
interconnection agreements with Sprint for operations in Nevada, Bell South for
operations in Georgia, and GTE for operations in California, respectively. These
agreements expire from November 1998 to March 2000.
 
   
     Certain rates per the Sprint interconnection agreement have been
established at the Federal Communications Commission (FCC) proxy rates and are
subject to adjustment upon final negotiations. The Company has
    
 
                                      F-15
<PAGE>   107
 
                            MGC COMMUNICATIONS, INC.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
                             SEPTEMBER 30, 1997 AND
                               DECEMBER 31, 1996
     (INFORMATION AS OF AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 IS
                                  UNAUDITED.)
 
   
recorded costs of sales related to this agreement in amounts which are
management's best estimates of the probable outcome of the final negotiated
rates, which are less than the FCC proxy rates. The difference, which totals
approximately $307,000 at September 30, 1997, has not been recorded in the
accompanying financial statements. Management believes that the resolution of
this matter will not have a material adverse effect on the Company's financial
position, results of operations, or liquidity.
    
 
   
(8)  SUBSEQUENT EVENT
    
 
   
CONVERTIBLE PREFERRED STOCK
    
 
   
     In November 1997, the Company completed a private placement offering in
which 5,148,570 shares of 8% Series A Convertible Preferred Stock ("Preferred
Stock") were issued at $3.50 per share, for total proceeds to the Company of
approximately $16.7 million, net of expenses. Each share of Preferred Stock is
convertible into shares of Common Stock at any time at the option of the holder.
In addition, each share of Preferred Stock is automatically converted into
Common Stock at its then applicable conversion rate in the event of the closing
of a qualified firm-commitment underwritten public offering.
    
 
   
     Dividends on the Preferred Stock accumulate whether or not the Company has
earnings or profits, whether or not there are funds legally available for the
payment of such dividends and whether or not dividends are declared. Except as
may otherwise be required by law, holders of shares of Preferred Stock are
entitled to vote together with the holders of Common Stock and not as a separate
class and are entitled to elect two members of the Company's Board of Directors.
    
 
   
     Commencing at any time on or after October 2, 2004, at the option and
written election of the holders of a majority of the outstanding shares of the
Preferred Stock, the Company shall, subject to applicable law, redeem all of the
outstanding shares of Preferred Stock at the price equal to the greater of (i)
$3.50, plus an amount equal to any unpaid dividends thereon, or (ii) the market
value of the Preferred Stock, on an as converted basis, determined by an
independent appraiser.
    
 
   
     The $15 million deposited in escrow with respect to the Common Stock
commitment was released after consummation of the Preferred Stock offering. As
set forth in the Warrant Agreement, if the Preferred Stock offering or the
Common Stock commitment is consummated at a price less than $5.00 per share, the
number of warrants issued was to have been adjusted to represent 6.4% of the
outstanding Common Stock on a fully diluted basis. Accordingly, the warrants
issued in connection with the Offering were increased from 1,291,200 to
1,438,205 and have been reflected in the accompanying financial statements as of
September 30, 1997.
    
 
                                      F-16
<PAGE>   108
 
                                                                         ANNEX A
 
                            MGC COMMUNICATIONS, INC.
 
                                    GLOSSARY
 
     Access Charges -- The charges paid by an interexchange carrier to an
ILEC/CLEC for the origination or termination of the IXC's customer's long
distance calls.
 
     Access Line -- A circuit that connects a telephone user (customer) to the
public switched telephone network. The access line usually connects to a
telephone at the customer's end.
 
     Bell System -- The name given to the large, single entity that comprised
what are today AT&T and the RBOCs, including Bell Laboratories and other
subsidiaries.
 
     CAP (Competitive Access Provider) -- A name for a category of local service
provider that appeared in the late 1980's, who competed with local telephone
companies by placing its own fiber optic cables in a city and sold various
private line telecommunications services in direct competition to the local
telephone company.
 
     CAP/CLEC -- First appearing in the early 1980's, Competitive Access
Providers (CAPs) resulted from the original deregulation of the
telecommunications industry. CAPs control (either through contractual
arrangement or actual construction) fiber routes which serve as an alternative
means of access to long distance carriers. CAP facilities provide a "buy-pass"
to the traditional means of routing long distance traffic through the RBOC/ILEC.
With the passage of the Act, many CAPs are now also entering the competitive
local phone service arena.
 
     Central Office (CO) -- The switching center and/or central circuit
termination facility of a local telephone company.
 
     CLEC (Competitive Local Exchange Carrier) -- A category of telephone
service provider (carrier) that offers services similar to the former monopoly
local telephone company, as recently allowed by changes in telecommunications
law and regulation. A CLEC may also provide other types of telecommunications
services (long distance, etc.).
 
     CLEC Certification -- Granted by a state public service commission or
public utility commission, this certification provides a telecommunications
services provider with the legal standing to offer local exchange telephone
services in direct competition with the incumbent LEC and other CLECs. Such
certifications are granted on a state by state basis.
 
     COCOT -- Customer owned, coin operated telephone lines.
 
     Communications Act of 1934 -- The first major federal legislation that
established rules for broadcast and non-broadcast communications, including both
wireless and wired telephone service.
 
     FCC (Federal Communications Commission) -- The US Government organization
charged with the oversight of all public communications media.
 
     Facilities-based -- A telecommunications provider that delivers its
services to the end-user via owned switches and leased (or owned) transport in
contrast to a reseller of an ILEC's services.
 
     ILEC (Incumbent Local Exchange Carrier) -- The local exchange carrier that
was the monopoly carrier, prior to the opening of local exchange services to
competition.
 
     ILEC Collocation -- A location serving as the interface point for a CLEC's
network interconnection to the ILEC. Collocation can be 1) physical, in which
the CLEC "builds" a fiber optic network extension into the ILEC central office,
or 2) virtual, in which the CLEC leases a facility, similar to that which it
might build, to affect a presence in the ILEC central office.
 
                                       A-1
<PAGE>   109
 
     Interconnection (co-carrier) Agreement -- A contract between an ILEC and a
CLEC for the interconnection of the two networks, for the purpose of mutual
passing of traffic between the networks, allowing customers of one of the
networks to call users served by the other network. These agreements set out the
financial and operational aspects of such interconnection.
 
     Interexchange Services -- Telecommunications services that are provided
between two exchange areas, generally meaning between two cities, i.e. long
distance.
 
     Interim Number Portability -- A temporary technique that allows local
exchange service customers of an ILEC to keep their existing telephone number,
while moving their service to a CLEC. The interim technique uses a central
office feature called remote call forwarding. The permanent solution to number
portability is to be implemented over the next few years.
 
     IXC (Interexchange Carrier) -- A provider of telecommunications services
that extend between exchanges or cities.
 
     LATA (Local Access and Transport Area) -- A geographic area inside of which
an ILEC can offer switched telecommunications services, even long distance
(known as local toll). There are 161 LATAs in the continental US. The LATA
boundaries were established at the Divestiture of the RBOCs.
 
     Local Exchange -- An area inside of which telephone calls are generally
completed without any toll, or long distance charges. Local exchange areas are
defined by the state regulator of telephone services.
 
     Local Exchange Services -- Telephone services that are provided within a
local exchange. These usually refer to local calling services (dial tone
services.) Business local exchange services include Centrex, access lines and
trunks and COCOT.
 
     POP (Point of Presence) -- A location where a carrier, usually an IXC, has
located transmission and terminating equipment to connect its network to the
networks of other carriers or to customers.
 
     RBOC (Regional Bell Operating Company) -- One of the ILECs created by the
Divestiture of the local exchange business by AT&T. These include BellSouth,
NYNEX, Bell Atlantic, Ameritech, US West, SBC and PacBell.
 
     Tier I Markets -- Major metropolitan areas of the United States, with a
minimum population of one million people.
 
   
     Tier II Sectors -- The suburban areas surrounding the core urban areas of
    
   
Tier I Markets.
    
 
                                       A-2
<PAGE>   110
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
     The Articles of Incorporation of the Registrant provide that directors of
the Registrant will not be personally liable for monetary damages to the
Registrant for certain breaches of their fiduciary duty as directors to the
fullest extent allowable by Nevada law. Under current Nevada law, directors
would remain liable for: (i) acts or omissions which involve intentional
misconduct, fraud or a knowing violation of law, and (ii) approval of certain
illegal dividends or redemptions. In appropriate circumstances, equitable
remedies or nonmonetary relief, such as an injunction, will remain available to
a stockholder seeking redress from any such violation. In addition, the
provision applies only to claims against a director arising out of his role as a
director and not in any other capacity (such as an officer or employee of the
Registrant).
 
     The Registrant also has the obligation, pursuant to such Registrant's
By-laws, to indemnify any director or officer of the Registrant for all expenses
incurred by them in connection with any legal action brought or threatened
against such person for or on account of any action or omission alleged to have
been committed while acting in the course and scope of the person's duties, if
the person acted in good faith and in a manner which the person reasonably
believed to be in or not opposed to the best interests of the Registrant, and
with respect to criminal actions, had no reasonable cause to believe the
person's conduct was unlawful, provided that such indemnification is made
pursuant to then existing provisions of Nevada General Corporation Law at the
time of any such indemnification.
 
     The Registration Rights Agreement filed as Exhibit 4.2 hereto contains
certain provisions pursuant to which certain officers, directors and controlling
persons of the Company may be entitled to be indemnified by the Initial
Purchasers and other holders of Notes.
 
ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
     (a) The following exhibits are filed as part of this Registration
Statement:
 
   
<TABLE>
<S>    <C>   <S>
 3.1    --   Articles of Incorporation of the Registrant, as amended.(1)
 3.2    --   Bylaws of the Registrant.(1)
 3.3    --   Certificate of Designation of Series A Convertible Preferred
             Stock.
 3.4    --   Stockholders Agreement dated on November 26, 1997, among the
             Company, Maurice J. Gallagher, Jr., Nield J. Montgomery and
             certain investors identified therein.
 4.1    --   Indenture dated as of September 29, 1997, between the
             Company and Marine Midland Bank, as Trustee.(1)
 4.2    --   Registration Rights Agreement dated as of September 29, 1997
             among the Company, Bear, Stearns & Co., Inc. and Furman Selz
             LLC.(1)
 4.3    --   Security Agreement dated as of September 29, 1997, between
             the Company and Marine Midland Bank.(1)
 4.4    --   Collateral Pledge and Security Agreement dated as of
             September 29, 1997, between the Company and Marine Midland
             Bank.(1)
 4.5    --   Form of Note (included in Exhibit 4.1).
 5.1    --   Opinion of Ellis, Funk, Goldberg, Labovitz & Dokson, P.C.
 8.1    --   Tax Opinion of Ellis, Funk, Goldberg, Labovitz & Dokson,
             P.C.
10.1    --   Network Products Purchase Agreement dated May 21, 1997,
             between the Company and Northern Telecom, Inc.
10.2    --   Employment/Stock Repurchase Agreement dated as of June 1996
             between the Company and Nield J. Montgomery, as amended as
             of September 1, 1997.(1)
10.3    --   Employment and Stock Repurchase Agreement dated May 28,
             1997, between the Company and John Boersma.(1)
</TABLE>
    
 
                                      II-1
<PAGE>   111
   
10.4    --   Stock Purchase Agreement dated August 29, 1997, between the
             Company and Mitchell Allee.(1)
10.5    --   Stock Option Plan.(1)
10.6    --   Purchase Agreement dated September 24, 1997, among the
             Company, Bear, Stearns & Co. Inc. and Furman Selz LLC.(1)
10.7    --   Warrant Agreement dated September 29, 1997, between the
             Company and Marine Midland Bank.(1)
10.8    --   Warrant Registration Rights Agreement dated as of September
             29, 1997, among the Company, Bear, Stearns & Co. Inc. and
             Furman Selz LLC.(1)
10.9    --   Private Placement Bank Escrow Agreement dated September 1997
             among the Company, Bear, Stearns & Co. Inc. and certain
             investors identified therein.(1)
10.10   --   Standard Office Lease Agreement dated July 1, 1997, between
             the Company and Cheyenne Investments L.L.C.(1)
10.11   --   Securities Purchase Agreement dated as of November 26, 1997,
             among the Company and the investors identified therein.
12.1    --   Computation of ratio of earnings to fixed charges.
23.1    --   Consent of Ellis, Funk, Goldberg, Labovitz & Dokson, P.C.
             (included in Exhibits 5.1 and 8.1)
23.2    --   Consent of KPMG Peat Marwick LLP.
24.1    --   Powers of Attorney.(1)
25.1    --   Statement of Eligibility of Trustee.(1)
27.1    --   Financial Data Schedule (for SEC use only).(1)
99.1    --   Form of Transmittal Letter.
99.2    --   Form of Notice of Guaranteed Delivery.
 
    
- ---------------
 
   
(1) Previously filed with this Registration Statement.
    
 
     (b) Financial Statement Schedule
 
     The following Financial Statement Schedule is filed as part of the
Registration Statement.
 
     Schedule II -- Valuation and Qualifying Accounts.
 
     All other financial statement schedules have been omitted because the
required information is not present or not present in amounts to require
submission of the schedules, or because the information required is included in
the financial statements.
 
ITEM 22.  UNDERTAKINGS.
 
     The undersigned Registrant hereby undertakes:
 
     (a) (i) The undersigned Registrant hereby undertakes:
 
          (A) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this Registration Statement:
 
             (1) To include any prospectus required by Section 10(a)(3) of the
        Securities Act of 1933;
 
             (2) To reflect in the prospectus any facts or events arising after
        the effective date of the Registration Statement (or the most recent
        post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the Registration Statement;
 
             (3) To include any material information with respect to the plan of
        distribution not previously disclosed in the Registration Statement or
        any material change to such information in the Registration Statement.
 
                                      II-2
<PAGE>   112
 
          (B) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
          (C) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unissued at the
     termination of the offering.
 
     (ii) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the foregoing provisions, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.
 
     (b) The undersigned Registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the prospectus pursuant to
Items 4, 10(b), 11 or 13 of this Form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed subsequent to the effective date of the registration statement through the
date of responding to the request.
 
     (c) The undersigned Registrant hereby undertakes to supply by means of a
post-effective amendment all information concerning a transaction, and the
Company being acquired involved therein, that was not the subject of and
included in the registration statement when it became effective.
 
                                      II-3
<PAGE>   113
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Pre-Effective Amendment No. 1 to Registration Statement to
be signed on its behalf by the undersigned, thereunto duly authorized, in the
City of Las Vegas, State of Nevada on the 7th day of January, 1998.
    
 
                                          MGC COMMUNICATIONS, INC.
 
                                          By:    /s/ NIELD J. MONTGOMERY
                                            ------------------------------------
                                                    Nield J. Montgomery
                                               President and Chief Executive
                                                           Officer
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Pre-Effective Amendment No. 1 to Registration Statement to
be signed on its behalf by the undersigned, thereunto duly authorized, in the
City of Las Vegas, State of Nevada on the 7th day of January, 1998.
    
 
   
<TABLE>
<C>                                                      <S>
               /s/ NIELD J. MONTGOMERY                   President (principal executive officer) and Director
- -----------------------------------------------------
                 Nield J. Montgomery
 
            /s/ MAURICE J. GALLAGHER, JR.                Chairman of the Board and Director
- -----------------------------------------------------
              Maurice J. Gallagher, Jr.
 
                /s/ LINDA M. SUNBURY                     Vice President -- Administration
- -----------------------------------------------------      (principal financial and accounting officer)
                  Linda M. Sunbury
 
                /s/ TIMOTHY P. FLYNN*                    Director
- -----------------------------------------------------
                  Timothy P. Flynn
 
                                                         Director
- -----------------------------------------------------
                   Jack L. Hancock
 
*By:      /s/ MAURICE J. GALLAGHER, JR.
- -----------------------------------------------------
              Maurice J. Gallagher, Jr.
                  Attorney-in-fact
</TABLE>
    
 
                                      II-4
<PAGE>   114
 
   
                                                                     SCHEDULE II
    
 
   
                            MGC COMMUNICATIONS, INC.
    
 
   
                       VALUATION AND QUALIFYING ACCOUNTS
    
   
   NINE MONTHS ENDED SEPTEMBER 30, 1997 AND THE YEAR ENDED DECEMBER 31, 1996
    
 
   
<TABLE>
<CAPTION>
                                               BALANCE        CHARGED                  DEDUCTIONS     BALANCE
                                             AT BEGINNING     TO COSTS       OTHER        FROM        AT END
DEDUCTIONS FROM ASSETS                        OF PERIOD     AND EXPENSES   ADDITIONS   RESERVES(1)   OF PERIOD
- ----------------------                       ------------   ------------   ---------   -----------   ---------
<S>                                          <C>            <C>            <C>         <C>           <C>
SEPTEMBER 30, 1997
Allowance for Doubtful Accounts............      $ --         $306,220       $ --       $168,942     $137,278
DECEMBER 31, 1996
Allowance for Doubtful Accounts............      $ --         $     --       $ --       $     --     $     --
</TABLE>
    
 
- ---------------
 
   
(1) Principally accounts written off.
    

<PAGE>   1
                                                                   EXHIBIT 3.3



                  CERTIFICATE OF DESIGNATION OF VOTING POWERS,
                    DESIGNATIONS, PREFERENCES, LIMITATIONS,
                                  RESTRICTIONS
                              AND RELATIVE RIGHTS

                                       OF

                    8% SERIES A CONVERTIBLE PREFERRED STOCK

                                       OF

                            MGC COMMUNICATIONS, INC.

                           -------------------------

                       Pursuant to Section 78.1955 of the
                 General Corporation Law of the State of Nevada

                           --------------------------

     MGC Communications, Inc., a Nevada corporation (the "Company") certifies
that pursuant to the authority contained in ARTICLE IV of its Articles of
Incorporation, as amended (the "Certificate of Incorporation"), and in
accordance with the provisions of Section 78.1955 of the General Corporation
Law of the State of Nevada ("NGCL"), the Board of Directors of the Company (the
"Board of Directors") by unanimous written consent dated November 24, 1997,
duly approved and adopted the following resolution which resolution remains in
full force and effect on the date hereof:

     RESOLVED, that pursuant to the authority vested in the Board of Directors
by the Certificate of Incorporation, the Board of Directors does hereby
designate, create, authorize and provide for the issue of a series of preferred
stock having a par value of $.001 per share, with a liquidation preference of
$3.50 per share (the "Liquidation Preference") which shall be designated as 8%
Series A Convertible Preferred Stock  (the "Preferred Stock") consisting of
6,571,450 shares, having voting powers, designations, preferences, limitations,
restrictions, and relative rights as follows:

     1.     Ranking.  The Preferred Stock shall rank, with respect to dividend
distributions and distributions upon a Liquidation (as defined in paragraph 4),
(i) senior to all classes of common stock of the Company and to each other class
of capital stock or series of preferred stock established after the Preferred
Stock Issue Date by the Board of Directors the terms of which do not expressly
provide that it ranks senior to or on a parity with the Preferred Stock as to
dividend distributions and distributions upon a Liquidation (collectively
referred to with the common stock of the Company as "Junior Securities"); (ii)
on a parity with any additional shares of Preferred Stock issued by the Company
in the future and any other class of capital stock or series of preferred stock
issued by the Company established after the Preferred Stock Issue Date by the
Board of Directors, the terms of which expressly provide that such class or
series will rank






                                       1




<PAGE>   2

on a parity with the Preferred Stock as to dividend distributions and
distributions upon a Liquidation (collectively referred to as "Parity
Securities"); and (iii) junior to each class of capital stock or series of
preferred stock issued by the Company established after the Preferred Stock
Issue Date by the Board of Directors the terms of which expressly provide that
such class or series will rank senior to the Preferred Stock as to dividend
distributions and distributions upon a Liquidation (collectively referred to as
"Senior Securities").

     No dividend whatsoever shall be declared or paid upon, or any sum set apart
for the payment of dividends upon, any outstanding share of the Preferred Stock
with respect to any dividend period unless all dividends for all preceding
dividend periods have been declared and paid, or declared and a sufficient sum
set apart for the payment of such dividend, upon all outstanding shares of
Senior Securities.

     2.      Dividends.

     (i)      The holders of shares of the Preferred Stock shall be entitled to
receive, when, as and if dividends are declared by the Board of Directors out of
funds of the Company legally available therefor, cumulative preferential
dividends from the Preferred Stock Issue Date accruing on a daily basis at the
rate per annum of 8% of the Liquidation Preference per share plus all
accumulated and unpaid dividends thereon.

     (ii)     Dividends on the Preferred Stock shall accumulate whether or not
the Company has earnings or profits, whether or not there are funds legally
available for the payment of such dividends and whether or not dividends are
declared.  Dividends will accumulate to the extent they are not paid.  The
Company shall take all actions required or permitted under the NGCL to permit
the payment of dividends on the Preferred Stock.

     (iii)    Unless full cumulative dividends on all outstanding shares of
Preferred Stock for all past dividend periods shall have been declared and paid,
or declared and a sufficient sum for the payment thereof set apart, then: (A) no
dividend (other than a dividend payable solely in shares of any Junior
Securities) shall be declared or paid upon, or any sum set apart for the payment
of dividends upon, any shares of Junior Securities; (B) no other distribution
shall be declared or made upon, or any sum set apart for the payment of any
distribution upon, any shares of Junior Securities, other than a distribution
consisting solely of Junior Securities; (C) no shares of Junior Securities shall
be purchased, redeemed or otherwise acquired or retired for value (excluding an
exchange for shares of other Junior Securities) by the Company or any of its
Subsidiaries, except for purchases or redemptions of Junior Securities held by
certain employees pursuant to written agreements existing on the date hereof
which shall not exceed $500,000 in any twelve-month period; and (D) no monies
shall be paid into or set apart or made available for a sinking or other like
fund for the purchase, redemption or other acquisition or retirement for value
of any shares of Junior Securities by the Company or any of its Subsidiaries.
Holders of the Preferred Stock will not be entitled to any dividends, whether
payable in cash, property or stock, in excess of the full cumulative dividends
as herein described.


                                       2




<PAGE>   3


     (iv)     In addition, when and if the Board of Directors shall declare a
dividend payable with respect to the then outstanding shares of Common Stock of
the Company, the holders of the Preferred Stock shall be entitled to the amount
of dividends per share as would be payable on the largest number of whole shares
of Common Stock into which each share of Preferred Stock could then be converted
pursuant to Section 3 hereof (such number to be determined as of the record date
for the determination of holders of Common Stock entitled to receive such
dividend).  Declared and unpaid dividends on the Preferred Stock will be payable
upon a Liquidation first to the holders of Preferred Stock and then to the
holders of Common Stock.

     (v)      In the event the Company shall make or issue, or shall fix a
record date for the determination of holders of Common Stock entitled to
receive, a dividend or other distribution with respect to the Common Stock
payable in (i) securities of the Company other than shares of Common Stock or
(ii) assets, then and in each such event the holders of Preferred Stock shall
receive, at the same time such distribution is made with respect to Common
Stock, the number of securities or such other assets of the Company which they
would have received had their Preferred Stock been converted into Common Stock
immediately prior to the record date for determining holders of Common Stock
entitled to receive such distribution.

     3.       Conversion.

     (i)      A holder of shares of Preferred Stock may convert such shares into
Common Stock at any time at the option of such holder.  For the purposes of
conversion, each share of Preferred Stock shall be valued at the Liquidation
Preference, which shall be divided by the Conversion Price in effect on the
Conversion Date to determine the number of shares of Common Stock issuable for
each share of Preferred Stock upon conversion.  Immediately following such
conversion, the rights of the holders of converted Preferred Stock shall cease
and the Persons entitled to receive the Common Stock upon the conversion of
Preferred Stock shall be treated for all purposes as having become the owners of
such Common Stock.

     (ii)     Upon the consummation of a Qualified Public Offering, all
outstanding shares of Preferred Stock shall be automatically converted into
Common Stock at the Conversion Price in effect immediately prior to the
consummation of such Qualified Public Offering.  Promptly following the
occurrence of such conversion, the Company shall give written notice thereof to
each record holder of converted Preferred Stock, including instructions to be
followed to obtain a certificate for the shares of Common Stock into which such
holder's Preferred Stock was converted.

     (iii)    To convert Preferred Stock (other than an automatic conversion
pursuant to paragraph 3(ii)), a holder must (A) surrender the certificate or
certificates evidencing the shares of Preferred Stock to be converted, duly
endorsed in a form satisfactory to the Company, at the office of the Company or
transfer agent for the Preferred Stock, (B) notify the Company at such office
that he elects to convert Preferred Stock and the number of shares to be
converted, and (C) state in writing the name or names in which he wishes the
certificate or certificates for shares of Common Stock to be issued.  The date
on which the holder satisfies all such requirements or the date on which the
Preferred Stock is subject to automatic conversion pursuant to paragraph 3(ii),

                                       3




<PAGE>   4

as the case may be, shall be the "Conversion Date."  As soon as practical, the
Company shall deliver a certificate for the number of full shares of Common
Stock issuable upon the conversion, except that the Company shall not be
required to deliver such certificate in the case of an automatic conversion
until the holders of the converted Preferred Stock shall have complied with the
provisions of clauses (A) and (C) of the first sentence of this paragraph
3(iii).  The Person in whose name the Common Stock certificate is registered
shall be treated as the stockholder of record on and after the Conversion Date.
No payment or adjustment will be made for accrued and unpaid dividends on
converted shares of Preferred Stock or for dividends on any Common Stock issued
upon such conversion.

     (iv)     The Company shall pay cash (based upon the higher of the last
reported sale price of the Common Stock or the good faith determination by the
Board of Directors of the fair market value of the Common Stock) in lieu of
issuing any fractional shares of Common Stock upon conversion of Preferred
Stock.

     (v)      If a holder converts shares of Preferred Stock, the Company shall
pay any documentary, stamp or similar issue or transfer tax due on the issue of
shares of Common Stock upon the conversion.  However, the holder shall pay any
such tax that is due because the shares are issued in a name other than the
holder's name.

     (vi)     The Company has reserved and shall continue to reserve out of its
authorized but unissued Common Stock or its Common Stock held in treasury a
sufficient number of shares of Common Stock to permit the conversion of the
Preferred Stock in full.  All shares of Common Stock that may be issued upon
conversion of Preferred Stock shall be fully paid and nonassessable.  The
Company shall endeavor to comply with all securities laws regulating the offer
and delivery of shares of Common Stock upon conversion of Preferred Stock and
shall endeavor to list such shares on each national securities exchange or
automated quotation system on which the Common Stock is listed.

     (vii)    If and whenever the Company shall issue or sell, or is, in
accordance with paragraph 3(vii)(a) through 3(vii)(h), deemed to have issued or
sold, any shares of Common Stock (other than (i) shares of Common Stock issuable
upon exercise of warrants or options outstanding as of the date of filing of
this Certificate of Designation and (ii) options to acquire Common Stock under
the Company's stock option plan and shares of Common Stock issuable under the
exercise of such options that are reserved for issuance as of the date of filing
of this Certificate of Designation as long as the exercise price per share of
such options is not less than the fair market value per share of the Common
Stock on the date of grant of such options) for a consideration per share less
than the Conversion Price in effect immediately prior to the time of such issue
or sale, then, forthwith upon such issue or sale the Conversion Price shall be
reduced to the price determined by dividing (i) an amount equal to the sum of
(x) the number of shares of Common Stock outstanding immediately prior to such
issue or sale on a fully diluted and converted basis multiplied by the then
existing Conversion Price and (y) the consideration, if any, received by the
Company upon such issue or sale, by (ii) the total number of shares of Common
Stock outstanding immediately after such issue or sale on a fully diluted and
converted basis.

                                       4




<PAGE>   5



     For purposes of this paragraph 3(vii), the following subsections 3(vii)(a)
to 3(vii)(h) shall also be applicable:

              (a)      In case at any time the Company shall in any manner grant
(whether directly or by assumption in a merger or otherwise) any warrants or
other rights to subscribe for or to purchase, or any options for the purchase
of, Common Stock or any stock or security convertible into or exchangeable for
Common Stock (such warrants, rights or options being called "Options" and such
convertible or exchangeable stock or securities being called "Convertible
Securities") whether or not such Options or the right to convert or exchange any
such Convertible Securities are immediately exercisable (other than the right to
purchase additional shares of Common Stock granted to warrant holders as a
result of antidilution provisions triggered by the issuance of the Preferred
Stock), and the price per share for which Common Stock is issuable upon the
exercise of such Options or upon the conversion or exchange of such Convertible
Securities (determined by dividing (i) the total amount, if any, received or
receivable by the Company as consideration for the granting of such Options,
plus the minimum aggregate amount of additional consideration payable to the
Company upon the exercise of all such Options, plus, in the case of such Options
which relate to Convertible Securities, the minimum aggregate amount of
additional consideration, if any, payable upon the issue or sale of such
Convertible Securities and upon the conversion or exchange thereof, by (ii) the
total maximum number of shares of Common Stock issuable upon the exercise of
such Options or upon the conversion or exchange of all such Convertible
Securities issuable upon the exercise of such Options) shall be less than the
applicable Conversion Price in effect immediately prior to the time of the
granting of such Options, then the total maximum number of shares of Common
Stock issuable upon the exercise of such Options or upon conversion or exchange
of the total maximum amount of such Convertible Securities issuable upon the
exercise of such Options shall be deemed to have been issued for such price per
share as of the date of granting of such Options or the issuance of such
Convertible Securities and thereafter shall be deemed to be outstanding. Except
as otherwise provided in subsection 3(vii)(c), no adjustment of the Conversion
Price shall be made upon the actual issue of such Common Stock or of such
Convertible Securities upon exercise of such Options or upon the actual issue of
such Common Stock upon conversion or exchange of such Convertible Securities.

              (b)      In case the Company shall in any manner issue (whether
directly or by assumption in a merger or otherwise) or sell any Convertible
Securities, whether or not the rights to exchange or convert any such
Convertible Securities are immediately exercisable, and the price per share for
which Common Stock is issuable upon such conversion or exchange (determined by
dividing (i) the total amount received or receivable by the Company as
consideration for the issue or sale of such Convertible Securities, plus the
minimum aggregate amount of additional consideration, if any, payable to the
Company upon the conversion or exchange thereof, by (ii) the total maximum
number of shares of Common Stock issuable upon the conversion or exchange of all
such Convertible Securities) shall be less than the Conversion Price in effect
immediately prior to the time of such issue or sale, then the total maximum
number of shares of Common Stock issuable upon conversion or exchange of all
such Convertible Securities shall be deemed to have been issued for such price
per share as of the date

                                       5




<PAGE>   6

of the issue or sale of such Convertible Securities and thereafter shall be
deemed to be outstanding, provided that (a) except as otherwise provided in
subsection 3(vii)(c), no adjustment of the Conversion Price shall be made upon
the actual issue of such Common Stock upon conversion or exchange of such
Convertible Securities and (b) if any such issue or sale of such Convertible
Securities is made upon exercise of any Options to purchase any such Convertible
Securities for which adjustments of the Conversion Price have been or are to be
made pursuant to other provisions of this subsection 3(vii), no further
adjustment of the Conversion Price shall be made by reason of such issue or
sale.

              (c)      Upon the happening of any of the following events,
namely, if the purchase price provided for in any Option referred to in
subsection 3(vii)(a), the additional consideration, if any, payable upon the
conversion or exchange of any Convertible Securities referred to in subsection
3(vii)(a) or 3(vii)(b), or the rate at which Convertible Securities referred to
in subsection 3(vii)(a) or 3(vii)(b) are convertible into or exchangeable for
Common Stock shall change at any time (including, but not limited to, changes
under or by reason of provisions designed to protect against dilution), the
Conversion Price in effect at the time of such event shall forthwith be
readjusted to the Conversion Price which would have been in effect at such time
had such Options or Convertible Securities still outstanding provided for such
changed purchase price, additional consideration or conversion rate, as the case
may be, at the time initially granted, issued or sold, provided that no
adjustment shall be made in the Conversion Price pursuant to this Section 3(vii)
that would increase the Conversion Price above the Conversion Price in effect
immediately prior to the issuance of such Option or Convertible Security; and on
the expiration or termination of any such Option or the termination of any such
right to convert or exchange such Convertible Securities, the Conversion Price
then in effect hereunder shall forthwith be increased to the Conversion Price
which would have been in effect at the time of such expiration or termination
had such Option or Convertible Securities, to the extent outstanding immediately
prior to such expiration or termination, never been issued.

              (d)      In case the Company shall declare a dividend or make any
other distribution upon any stock of the Company payable in Common Stock (except
for dividends or distributions upon the Common Stock payable solely in shares of
Common Stock), Options or Convertible Securities, any Common Stock, Options or
Convertible Securities, as the case may be, issuable in payment of such dividend
or distribution shall be deemed to have been issued or sold without
consideration.

              (e)      In the event the Company shall make or issue, or fix a
record for the determination of holders of Common Stock entitled to receive, a
dividend or other distribution payable in securities of the Company, then and in
each such event lawful and adequate provision shall be made so that the holders
of Preferred Stock shall receive upon conversion thereof in addition to the
number of shares of Common Stock receivable thereupon, the number of securities
of the Company which they would have received had their Preferred Stock been
converted into Common Stock on the date of such event and had they thereafter,
during the period from the date of such event to and including the Conversion
Date, retained such securities receivable by them as aforesaid during such
period, giving application to all adjustments called

                                       6




<PAGE>   7

for during such period under this paragraph 3 with respect to the rights of the
holders of the Preferred Stock.

              (f)      In case any shares of Common Stock, Options or
Convertible Securities shall be issued or sold for cash, the consideration
received therefor shall be deemed to be the amount received by the Company
therefor, without deduction therefrom of any expenses incurred or any
underwriting commissions or concessions paid or allowed by the Company in
connection therewith.  In case any shares of Common Stock, Options or
Convertible Securities shall be issued or sold for a consideration other than
cash, the amount of the consideration other than cash received by the Company
shall be deemed to be the fair value of such consideration as determined in good
faith by the Board of Directors of the Company, without deduction of any
expenses incurred or any underwriting commissions or concessions paid or allowed
by the Company in connection therewith.  In case any Options shall be issued in
connection with the issue and sale of other securities of the Company, together
comprising one integral transaction in which no specific consideration is
allocated to such Options by the parties thereto, such Options shall be deemed
to have been issued for such consideration of $.01.

              (g)      In case the Company shall take a record of the holders of
its Common Stock for the purpose of entitling them (i) to receive a dividend or
other distribution payable in Common Stock, Options or Convertible Securities or
(ii) to subscribe for or purchase Common Stock, Options or Convertible
Securities, then such record date shall be deemed to be the date of the issue or
sale of the shares of Common Stock deemed to have been issued or sold upon the
declaration of such dividend or the making of such other distribution or the
date of the granting of such right of subscription or purchase, as the case may
be.

              (h)      The number of shares of Common Stock outstanding at any
given time shall not include shares owned or held by or for the account of the
Company (or any Subsidiary), and the disposition of any shares of Common Stock
so owned shall be considered an issue or sale of Common Stock for the purpose of
this subsection 3(vii)(h).

     (viii)   In case the Company shall at any time subdivide (by any stock
split, stock dividend or otherwise) its outstanding shares of Common Stock into
a greater number of shares, the Conversion Price in effect immediately prior to
such subdivision shall be proportionately reduced, and, conversely, in case the
outstanding shares of Common Stock shall be combined into a smaller number of
shares, the Conversion Price in effect immediately prior to such combination
shall be proportionately increased.

     (ix)     Except for an event which the holders of the Preferred Stock elect
to treat as a Liquidation in accordance with the provisions of paragraph 4, if
any capital reorganization or reclassification of the capital stock of the
Company, or a merger or consolidation of the Company with or into another
company or the sale of all or substantially all of the Company's properties and
assets to any other person shall be effected in such a way that holders of
Common Stock shall be entitled to receive stock, securities or assets with
respect to or in exchange for Common Stock, then, as a condition of such
reorganization, reclassification, merger, consolidation or sale, lawful and
adequate provisions shall be made whereby each holder of a

                                       7




<PAGE>   8

share or shares of Preferred Stock shall thereupon have the right to receive,
upon the basis and upon the terms and conditions specified herein and in lieu
of the shares of Common Stock immediately theretofore receivable upon the
conversion of such share or shares of Preferred Stock, such shares of stock,
securities or assets as may be issued or payable with respect to or in exchange
for a number of outstanding shares of such Common Stock equal to the number of
shares of such Common Stock immediately theretofore receivable upon such
conversion had such reorganization, reclassification, merger, consolidation or
sale not taken place, and in any such case appropriate provisions shall be made
with respect to the rights and interests of such holder to the end that the
provisions hereof (including without limitation provisions for adjustments of
the Conversion Price) shall thereafter be applicable, as nearly as may be, in
relation to any shares of stock, securities or assets thereafter deliverable
upon the exercise of such conversion rights.

     (x)      No adjustment in the Conversion Price need be made until all
cumulative adjustments amount to 1% or more of the Conversion Price as last
adjusted.  Any adjustments that are not made shall be carried forward and taken
into account in any subsequent adjustment.  All calculations under this
paragraph 3 shall be made to the nearest 1/10,000th of a cent or to the nearest
1/10,000th of a share, as the case may be. No adjustment in the Conversion Price
shall reduce the Conversion Price below the then par value of the Common Stock.

     (xi)     As used in this paragraph 3, the term "Common Stock" shall mean
and include the Company's authorized Common Stock, $.001 par value per share, as
constituted on the date of filing of these terms of the Preferred Stock, and
shall also include any capital stock of any class of the Company thereafter
authorized which shall not be limited to a fixed sum or percentage of par value
in respect of the rights of the holders thereof to participate in dividends or
in the distribution of assets upon the voluntary or involuntary liquidation,
dissolution or winding up of the Company; provided that the shares of Common
Stock receivable upon conversion of shares of Preferred Stock shall include only
shares designated as Common Stock of the Company on the date of filing of this
instrument, or in case of any reorganization or reclassification of the
outstanding shares thereof, the stock, securities or assets provided for in
subsection 3(ix).

     (xii)    Whenever the Conversion Price is adjusted, the Company shall
promptly mail to holders of Preferred Stock, first class, postage prepaid, a
notice of the adjustment.  The Company shall file with the transfer agent for
the Preferred Stock, if any (and make available to holders of Preferred Stock
upon request), a certificate from the Company's independent public accountants
briefly stating the facts requiring the adjustment and the manner of computing
it.

     (xiii)   In case at any time (a) the Company shall declare any dividend
upon its Common Stock payable in cash or stock or make any other distribution to
the holders of its Common Stock, (b) the Company shall offer for subscription
pro rata to the holders of its Common Stock any additional shares of stock of
any class or other rights, (c) there shall be any capital reorganization or
reclassification of the capital stock of the Company, or a consolidation or
merger of the Company with or into, or a sale of all or substantially all its
assets to, another entity or entities or (d) there shall be a voluntary or
involuntary dissolution, liquidation or winding up of the Company;

                                       8




<PAGE>   9



then, in any one or more of said cases, the Company shall give, by first class
mail, postage prepaid, or by facsimile, addressed to each holder of any shares
of Preferred Stock at the address of such holder as shown on the books of the
Company, (1) at least 20 days' prior written notice of the date on which the
books of the Company shall close or a record shall be taken for such dividend,
distribution or subscription rights or for determining rights to vote in
respect of any such reorganization, reclassification, consolidation, merger,
sale, dissolution, liquidation or winding up and (2) in the case of any such
reorganization, reclassification, consolidation, merger, sale, dissolution,
liquidation or winding up, at least 20 days' prior written notice of the date
when the same shall take place.  Such notice in accordance with the foregoing
clause (1) shall also specify, in the case of any such dividend, distribution
or subscription rights, the date on which the holders of Common Stock shall be
entitled thereto and such notice in accordance with the foregoing clause (2)
shall also specify the date or projected date on which the holders of Common
Stock shall be entitled to exchange their Common Stock for securities or other
property deliverable upon such reorganization, reclassification, consolidation,
merger, sale, dissolution, liquidation or winding up, as the case may be.

     (xiv)    The Company will at no time close its transfer books against the
transfer of any Preferred Stock or of any shares of Common Stock issued or
issuable upon the conversion of any shares of Preferred Stock in any manner
which interferes with the timely conversion of such Preferred Stock, except as
may otherwise be required to comply with applicable securities laws.

     4.       Liquidation Rights. Upon any voluntary or involuntary liquidation,
dissolution or winding-up of the Company resulting in a distribution of assets
to the holders of any class or series of the Company's capital stock (each such
event, a "Liquidation"), each holder of shares of the Preferred Stock will be
entitled to payment out of the assets of the Company available for distribution
of an amount equal to the following before any distribution is made on any
Junior Securities, including, without limitation, Common Stock of the Company:

     (a)      if the amount of the Liquidation Preference plus the amount of the
Liquidation Participation (hereinafter defined) is less than or equal to 2 times
the Liquidation Preference, then each holder of shares of the Preferred Stock
will receive (i) the Liquidation Preference per share of Preferred Stock held by
such holder, plus accrued and unpaid dividends, to the date fixed for such
Liquidation plus (ii) the amount of the remaining assets of the Company (after
payment of the Liquidation Preference to all outstanding shares of Preferred
Stock as required by clause(i)) that the holder of one share of Preferred Stock
would receive (the "Liquidation Participation"), on an as-converted basis into
Common Stock as if such Preferred Stock had been converted to Common Stock
immediately prior to such Liquidation; or

     (b)      if the amount of the Liquidation Preference plus the amount of the
Liquidation Participation that would have been received by the holder of one
share of Preferred Stock under paragraph (a) above would have otherwise exceeded
2 times the Liquidation Preference, then the holder of each share of the
Preferred Stock shall receive upon Liquidation an amount equal to the greater of
(i) 2 times the Liquidation Preference or (ii) the amount that each share of
Preferred Stock would receive, on an as-converted basis into Common Stock as if
such Preferred Stock had

                                       9




<PAGE>   10

been converted to Common Stock immediately prior to such Liquidation determined
without regard to any Liquidation Preference.

     If, upon any Liquidation, the amounts payable with respect to the Preferred
Stock and all other Parity Securities are not paid in full, the holders of the
Preferred Stock and the Parity Securities will share equally and ratably in any
distribution of assets of the Company in proportion to the full liquidation
preference and accumulated and unpaid dividends, to which each is entitled. For
the purposes of this paragraph 4, holders of a majority of the Preferred Stock
may designate that a consolidation or merger of the Company (other than a merger
(i) in which the Company is the surviving company, (ii) which involves only a
change in the Company's state of incorporation, or (iii) with a wholly-owned
Subsidiary of the Company) or the sale of all or substantially all of the
Company's assets shall be deemed to be a Liquidation with respect to the
Preferred Stock (each such event, an "Organic Change"), if (i) the amount of
consideration (including the fair market value of any non-cash consideration)
received would be less than the Liquidation Preference, or (ii) such
consideration consists solely or in part of securities that are not readily
marketable on a national exchange or on the Nasdaq National Market. In the event
that the holders of a series of Preferred Stock shall deem any transaction to be
a "Liquidation" in accordance with this paragraph 4, the holders of any such
series of Preferred Stock shall be entitled to payment of the amount set forth
in paragraph (a) or (b) above, as applicable.  To the extent any consideration
consists of non-cash items, the consideration shall be the fair market value of
such consideration determined between a willing buyer and a willing seller (the
"Consideration Value"), using the Evaluation Procedure.

     5.       Voting Rights.

     (i)      The holders of the Preferred Stock shall have the right to vote,
together with the holders of all the outstanding shares of Common Stock and not
by classes, except as otherwise required by Nevada law, on all matters on which
holders of Common Stock are entitled to vote.  Each holder of Preferred Stock
shall have the right to cast one vote for each whole share of Common Stock which
would be issued to such holder upon conversion of such holder's shares of
Preferred Stock, assuming that such conversion were to occur on the date
immediately prior to the record date for the determination of stockholders
entitled to vote.

     (ii)     The holders of a majority of the outstanding shares of Preferred
Stock, voting as a separate single class, shall be entitled to elect two (2)
members to the Company's Board of Directors.  Such right may be exercised
initially either at a special meeting of the holders of Preferred Stock or at
any annual meeting of stockholders held for the purpose of electing directors,
and thereafter at such annual meetings or by the written consent of the holders
of a majority of the outstanding shares of Preferred Stock.

     (iii)    If any director so elected by the holders of Preferred Stock shall
cease to serve as a director before his term shall expire, the holders of
Preferred Stock then outstanding may, at a special meeting of the holders, elect
a successor to hold office for the unexpired term of the director whose place
shall be vacant.


                                       10




<PAGE>   11


     (iv)     The Company shall not, without the affirmative vote or consent of
the holders of at least a majority of the shares of Preferred Stock then
outstanding (with shares held by the Company or any of its Affiliates not being
considered to be outstanding for this purpose) voting or consenting as the case
may be, as one class:

              (A)    authorize, create (by way of reclassification or otherwise)
or issue any Senior Securities or Parity Securities or any obligation or
security convertible or exchangeable into or evidencing the right to purchase,
shares of any class or series of Senior Securities or Parity Securities;
provided, however, that the Company may issue up to an additional 1,422,857
shares of Preferred Stock within 120 days after the original issuance of the
Preferred Stock on substantially the same terms and conditions of such original
issuance;

              (B)    amend or otherwise alter this Certificate of Designation
(including the provisions of paragraph 5 hereof) in any manner that adversely
affects the specified rights, preferences, privileges or voting rights of
holders of Preferred Stock;

              (C)    authorize the issuance of any additional shares of
Preferred Stock; provided, however, that the Company may issue up to an
additional 1,422,857 shares of Preferred Stock within 120 days after the
original issuance of the Preferred Stock on substantially the same terms and
conditions of such original issuance;

              (D)    waive compliance with any provision of this Certificate of
Designation;

              (E)    declare or pay any dividend or distribution on any capital
stock (except for the Preferred Stock , Senior Securities or Parity Securities,
as approved pursuant to (A) above); or

              (F)    authorize any Liquidation or Organic Change, unless such
event would generate a distribution to each holder of one share of Preferred
Stock of an amount greater than or equal to 3 times the Liquidation Preference
of such share.  The voting right contained in this subsection 5(v)(F) shall
terminate upon a Public Offering if the underwriters of such Public Offering, in
their sole judgment, advise the Company that, in their opinion, the above
provision will adversely affect the price or distribution of any equity security
to be offered.

     (v)      Paragraphs 5(ii), 5(iii) and 5(iv) shall terminate after more than
50% of the Preferred Stock has been converted to Common Stock pursuant to the
terms hereunder.

     6.       Redemption.

     (a)      Commencing at any time on or after October 2, 2004 (or such
earlier date as the Senior Notes shall cease to be outstanding or the covenants
contained in Section 4.09 of the Indenture shall be defeased), at the option and
written election of the holders of a majority of the outstanding shares of the
Preferred Stock, the Company shall, subject to applicable law, redeem all of the
outstanding shares of Preferred Stock, at the price and upon the terms stated in
this paragraph 6.

                                       11




<PAGE>   12



     (b)      If, at any time after November 26, 2002, the Company shall be
permitted pursuant to Section 4.09 of the Indenture to issue sufficient
Disqualified Stock (as defined in the Indenture) such that if each share of
Preferred Stock were to be issued on such date the Company would not be in
default under the terms of the Indenture, then the Company shall notify each
holder of Preferred Stock that the Company is no longer prohibited from granting
such holder a right to require the Company to redeem the Preferred Stock.
Thereafter, at the option and written election of the holders of a majority of
the outstanding shares of the Preferred Stock, the Company shall, subject to
applicable law and to the extent the Company is not prohibited by the terms of
the Indenture from redeeming the Preferred Stock, redeem all of the outstanding
shares of Preferred Stock, at the price and upon the terms stated in this
paragraph 6.

     (c)      The Company shall redeem the Preferred Stock on the Redemption
Date (as such term is defined below), unless otherwise prevented by law or the
terms of the Senior Notes, at a redemption price per share equal to the greater
of (i) the Liquidation Preference, plus an amount equal to any unpaid dividends
thereon and (ii) the Market Value (as defined below) of the Preferred Stock, on
an as-converted basis.  The total sum payable per share of Preferred Stock on
the Redemption Date, is hereinafter referred to as the "Redemption Price," and
the payment to be made on a Redemption Date is hereinafter referred to as the
"Redemption Payment."  The Market Value shall be the fair market value of the
Preferred Stock (on an as-converted basis) determined between a willing buyer
and a willing seller, using the Evaluation Procedure.

     On and after any Redemption Date, all rights of any holder of Preferred
Stock, except the right to receive the Redemption Price per share of Preferred
Stock as hereinafter provided, shall cease and terminate, and such shares of
Preferred Stock shall no longer be deemed to be outstanding, whether or not the
certificates representing such shares have been received by the Company;
provided, however, that, notwithstanding anything to the contrary set forth
herein, (i) if the Company defaults in the payment of the Redemption Payment,
the rights of the holders of Preferred Stock with respect to such shares of
Preferred Stock shall continue until the Company cures such default, and (ii)
without limiting any other rights of such holders, upon the occurrence of (A) a
subsequent Liquidation or (B) an Organic Change, with respect to the shares of
Preferred Stock in respect of which no Redemption Payment has been received by a
holder of Preferred Stock where the Company had been required to make the
payment, such holder shall be accorded the rights and benefits set forth in
Section 4 hereof in respect of such shares, as if no prior redemption request
had been made.

     Within five (5) Business Days of receipt of a redemption request, the
Company shall notify in writing all other Preferred Stockholders of the request
for the redemption of Preferred Stock (the "Company Notice").  On the 115th day
following the date upon which the Company shall have sent the Company Notice,
the Company shall pay each holder of Preferred Stock the applicable Redemption
Price, provided that the Company or its transfer agent has received the
certificates) representing the shares of Preferred Stock to be redeemed.  Such
payment date shall be referred to herein as a  "Redemption Date".  If, on a
Redemption Date, less than all the shares of Preferred Stock requested to be
redeemed may be legally redeemed by the Company without resulting in a default
under the terms of the Senior Notes, the redemption of such Preferred Stock

                                       12




<PAGE>   13

shall be made pro rata based upon the total amount that would be paid by the
Company to each holder of Preferred Stock being redeemed if all of the shares
of Preferred Stock requested to be redeemed by the holders of Preferred Stock
being redeemed were so redeemed, and any shares of Preferred Stock not redeemed
shall be redeemed, at the holder's election, on any date following such
Redemption Date on which the Company may lawfully redeem such shares without
resulting in a default under the Senior Notes.  The Company shall redeem
(unless otherwise prevented by law or by the terms of the Senior Notes) the
shares of Preferred Stock being redeemed by each holder on the Redemption Date,
and the Company shall promptly advise each such holder of such Redemption Date
or of the relevant facts applicable thereto preventing such redemption.  Upon
redemption of only a portion of the number of shares covered by a Preferred
Stock certificate, the Company shall issue and deliver to or upon the written
order of the holder of such Preferred Stock certificate, at the expense of the
Company, a new certificate covering the number of shares of the Preferred Stock
representing the unredeemed portion of the Preferred Stock certificate, which
new certificate shall entitle the holder thereof to all the rights, powers, and
privileges of a holder of such shares.

     7.       Amendment.  This Certificate of Designation shall not be amended,
either directly or indirectly, or through merger or consolidation with another
entity, in any manner that would alter or change the powers, preferences or
special rights of the Preferred Stock so as to affect them adversely without the
affirmative vote of the holders of a majority or more of the outstanding
Preferred Stock, voting separately as a class.

     8.       Headings of Subdivisions.  The headings of the various
subdivisions hereof are for convenience of reference only and shall not affect
the interpretation of any of the provisions hereof.

     9.       Severability of Provisions.  If any voting powers, preferences and
relative, participating, optional and other special rights of the Preferred
Stock and qualifications, limitations and restrictions thereof set forth in this
resolution (as such resolution may be amended from time to time) is invalid,
unlawful or incapable of being enforced by reason of any rule of law or public
policy, all other voting powers, preferences and relative, participating,
optional and other special rights of Preferred Stock and qualifications,
limitations and restrictions thereof set forth in this resolution (as so
amended) which can be given effect without the invalid, unlawful or
unenforceable voting powers, preferences and relative, participating, optional
and other special rights of Preferred Stock and qualifications, limitations and
restrictions thereof shall, nevertheless, remain in full force and effect, and
no voting powers, preferences and relative, participating, optional or other
special rights of Preferred Stock and qualifications, limitations and
restrictions thereof herein set forth shall be deemed dependent upon any other
such voting powers, preferences and relative, participating, optional or other
special rights of Preferred Stock and qualifications, limitations and
restrictions thereof unless so expressed herein.

     10.      Reissuance of Preferred Stock.  Shares of Preferred Stock that
have been issued and reacquired in any manner, including shares purchased or
redeemed or exchanged or converted, shall (upon compliance with any applicable
provisions of the laws of Nevada) have the status of authorized but unissued
shares of preferred stock of the Company undesignated as to

                                       13




<PAGE>   14

series and may be designated or redesignated and issued or reissued, as the
case may be, as part of any series of preferred stock of the Company, provided
that any issuance of such shares as Preferred Stock must be in compliance with
the terms hereof.

     11.      Mutilated or Missing Preferred Stock Certificates.  If any of the
Preferred Stock certificates shall be mutilated, lost, stolen or destroyed, the
Company shall issue, in exchange and in substitution for and upon cancellation
of the mutilated Preferred Stock certificate, or in lieu of and substitution for
the Preferred Stock certificate lost, stolen or destroyed, a new Preferred Stock
certificate of like tenor and representing an equivalent amount of shares of
Preferred Stock, but only upon receipt of evidence of such loss, theft or
destruction of such Preferred Stock certificate and indemnity, if requested,
satisfactory to the Company and the transfer agent (if other than the Company).

     12.      Certain Definitions.  As used in this Certificate of Designation,
the following terms shall have the following meanings (with terms defined in the
singular having comparable meanings when used in the plural and vice versa),
unless the context otherwise requires:

     "Affiliates" shall have the meaning ascribed to such term in the Securities
Purchase Agreement among the Company and the initial purchasers of the Preferred
Stock.

     "Business Day" means any day except a Saturday, a Sunday, or any day on
which banking institutions in New York, New York are required or authorized by
law or other governmental action to be closed.

     "Commission" means the Securities and Exchange Commission.

     "Common Stock" means the Common Stock, par value $0.001 per share, of the
Company.

     "Conversion Price" shall initially equal the Liquidation Preference and
thereafter shall be subject to adjustment from time to time pursuant to the
terms of paragraph 3 hereof.

     "Evaluation Procedure" shall have the following meaning.  If after good
faith negotiations the Company and the holders of a majority of the Preferred
Stock are unable to agree on (i) the Consideration Value of non-cash
consideration or (ii) the Market Value of the Preferred Stock (on an
as-converted basis) within 10 days, the Consideration Value or the Market Value
shall be determined by an independent appraiser reasonably acceptable to the
Company and the holders of a majority of the Preferred Stock.  If the Company
and the holders of a majority of the Preferred Stock are unable to agree on an
appraiser within 10 days, each of the Company and the holders of the Preferred
Stock shall promptly select an independent appraiser and the two appraisers so
selected shall promptly select a third appraiser to determine the Consideration
Value or the Market Value.  The expenses of the appraisers will be borne by the
Company, and the determination of such appraiser will be binding and final upon
all parties.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended.

                                       14




<PAGE>   15



     "Indenture" means the Indenture, dated as of September 29, 1997, among the
Company and Marine Midland Bank, as Trustee, with respect to the Senior Notes.

     "Market Average Price" means the volume-weighted average sales price per
share of Common Stock as reported by Bloomberg Information Systems, Inc. during
either (i) a period of 20 days consisting of the day on which the Company
consummates a Public Offering and the 19 consecutive Business Days subsequent to
such day or (ii) any period of 60 consecutive Business Days after the expiration
of such initial 20 day period, but only if the average daily trading volume over
such 60 Business Day period exceeds 3% of the outstanding shares of Common Stock
of the Company that are registered, issued and eligible for trading.  If at any
time shares of the Common Stock are not listed on any securities exchange or
quoted in the Nasdaq System or the over-the-counter market, the "Market Average
Price" shall be the fair value thereof determined by an investment bank mutually
agreed between the Company and the holders of a majority of the Preferred Stock.
If such parties are unable to reach agreement within a reasonable period of
time, each such party will choose and bear the expense of an investment bank to
value the shares of Common Stock and the average of the two valuations shall be
the value.

     "Preferred Stock Issue Date" means the date on which the Preferred Stock is
originally issued by the Company under this Certificate of Designation.

     "Public Offering" means a firm commitment underwritten public offering of
shares of Common Stock pursuant to an effective registration statement under the
Securities Act of 1933, as then in effect or any comparable statement under any
similar federal statute then in force or effect.

     "Qualified Public Offering" shall mean one or more Public Offerings in
which the cumulative gross proceeds to the Company are equal to or greater then
$25 million and either the price per share paid in the Public Offering or the
Market Average Price is greater than (i) 1.5 times the then applicable
Conversion Price, if the Public Offering is consummated within 365 days of the
date hereof, (ii) 2.0 times the then applicable Conversion Price, if the Public
Offering is consummated between 366 and 730 days of the date hereof or (c) 2.5
times the then applicable Conversion Price, if the Public Offering is
consummated after 731 days of the date hereof.

     "Senior Notes" means the Company's 13% Senior Secured Notes due 2004.

     "Subsidiary" of any Person means (i) any corporation, association or
business entity of which more than 50% of the total voting power of shares of
capital stock entitled (without regard to the occurrence of any contingency) to
vote in the election of directors, managers or trustees thereof is at the time
owned or controlled, directly or indirectly, by such Person or one or more of
the other Subsidiaries of such Person or a combination thereof and (ii) any
partnership (a) the sole general partner or the managing general partner of
which is such Person or a Subsidiary of such Person or (b) the only general
partners of which are such Person or one or more Subsidiaries of such Person or
any combination thereof.

                                       15




<PAGE>   16


            IN WITNESS WHEREOF, the Company has caused this certificate to be
duly executed by Nield J. Montgomery, President of the Company, and attested by
Kent F. Heyman, Secretary of the Company, this 25th day of November, 1997.

                                 MGC COMMUNICATIONS, INC.



                                 By: /s/ Nield J. Montgomery
                                    -------------------------------
                                 Name:   Nield J. Montgomery
                                 Title:  President


By: /s/ Kent F. Heyman
    ---------------------------
Name:  Kent F. Heyman
Title: Secretary


STATE OF NEVADA           )
:  ss. :
COUNTY OF CLARK           )



     On the 24 day of November, 1997, before me personally came Nield J.
Montgomery to me known, who, being by me duly sworn, did depose and say he
resides at 8825 LaMadre, Las Vegas, NV 89129 and that he is the President of MGC
Communications, Inc., the corporation described in and which executed the above
instrument; and that he acknowledged said instrument to be the free act and deed
of said corporation.


/s/
______________________
Notary Public

                                       16





<PAGE>   1
                                                                    EXHIBIT 3.4

                             STOCKHOLDERS AGREEMENT

         THIS STOCKHOLDERS' AGREEMENT (the "Agreement"), entered into this 26th
day of November, 1997 is made by and among (i) MGC Communications, Inc., a
Nevada corporation (the "Company"), (ii) each person listed on Exhibit A hereto
(collectively, the "Original Holders") and (iii) each person listed on Exhibit
B hereto (collectively, the "Investors").

         WHEREAS, each of the Original Holders is the record and beneficial
owner of shares of Common Stock;

         WHEREAS, pursuant to the Securities Purchase Agreement, dated as of
the date hereof (the "Purchase Agreement"), among the Company and the
Investors, the Company shall issue on the date hereof to the Investors
5,148,570 shares of the Company's 8% Series A Convertible Preferred Stock, par
value $.001 per share (the "Series A Preferred Stock");

         WHEREAS, the parties hereto desire to set forth more fully their
agreements regarding the investment by the Investors in the Company;

         NOW THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements contained herein, the receipt and sufficiency of which
are acknowledged, the parties hereto, each intending to be legally bound
hereby, agree as follows:

                                   ARTICLE I.

                                  DEFINITIONS

         SECTION 1.1           Definitions.

         As used herein, the following terms shall have the respective meanings
set forth below:

         "Affiliate" shall have the meaning ascribed thereto in the Purchase
Agreement.

         "Board of Directors" means the Board of Directors of the Company, as
constituted from time to time in accordance with this Agreement and the
Company's Bylaws.

         "Capital Stock" means any class of capital stock of the Company
including, without limitation, the Common Stock and the Series A Preferred
Stock.

         "Common Stock" means the Company's Common Stock, par value $.001 per
share.

         "Conversion Price" means the then applicable Conversion Price for the
Series A Preferred Stock, as defined in the Company's Articles of
Incorporation.

<PAGE>   2

         "Director" means a member of the Board of Directors.

         "Family Group" means a Person's parents, spouse, descendants (whether
or not adopted) and stepchildren and any trust solely for the benefit of such
Person and/or the Person's parents, spouse, stepchildren and/or descendants.

         "Holder Group" means (i) the Original Holders (as a collective group)
or (ii) the Investors (as a collective group).

         "JK&B Investors" means those Investors listed as JK&B Investors on the
signature pages hereto.

         "Key Original Holders" means the Original Holders listed as "Key
Original Holders" on Exhibit A.

         "Majority Investor Holders" at any time means the holders of a
majority of the Registrable Securities held by all Investors.

         "Market Average Price" means the volume-weighted average sales price
per share of Common Stock as reported by Bloomberg Information Systems, Inc.
during either (i) a period of 20 days consisting of the day on which the
Company consummates a Public Offering and the 19 consecutive Business Days
subsequent to such day or (ii) any period of 60 consecutive Business Days after
the expiration of such initial 20 day period but only if that the average daily
trading volume over such 60 Business Day period exceeds 3% of the outstanding
shares of Common Stock of the Company that are registered, issued and eligible
for trading. If at any time shares of the Common Stock are not listed on any
securities exchange or quoted in the Nasdaq System or the over-the-counter
market, the "Market Average Price" shall be the fair value thereof determined
by an investment bank mutually agreed between the Company and a majority of the
holders of the Series A Preferred Stock. If such parties are unable to reach
agreement within a reasonable period of time, each such party will choose and
bear the expense of an investment bank to value the shares of Common Stock and
the average of the two valuations shall be the value.

         "New Securities" shall mean any Capital Stock whether now authorized
or not, and rights, options or warrants to purchase Capital Stock, and
securities of any type whatsoever that are, or may become convertible into or
exchangeable for Capital Stock; provided that the term "New Securities" does
not include (i) Series A Preferred Stock issued on the date hereof and up to
1,422,857 additional shares of Series A Preferred Stock issued within 120 days
after the date hereof on substantially the same terms and conditions as those
contained in the Purchase Agreement, (ii) Series A Preferred Stock issued as a
stock dividend to holders of Series A Preferred Stock, (iii) securities issued
in connection with an acquisition, merger or strategic financing approved by
the vote of the Board of Directors, (iv) shares of Common Stock issuable upon
exercise of stock awards granted to consultants, employees, officers, managers
or directors of the Company pursuant to a plan approved by the Board of
Directors, (v) shares of Common Stock issued pursuant to registered public
offerings, (vi) debt securities that are not, and will not

                                       2
<PAGE>   3

become, convertible into or exchangeable for capital stock, (vii) shares of
Common Stock issued upon the exercise of warrants issued prior to the date
hereof and (viii) shares of Common Stock issued as a dividend on outstanding
shares of Common Stock or preferred stock.

         "Person" means any individual, corporation, partnership, firm, joint
venture, association, joint-stock company, trust, unincorporated organization
or other entity.

         "Public Offering" shall have the meaning ascribed to such term in the
Purchase Agreement.

         "Qualified Public Offering" shall mean one or more Public Offerings in
which the cumulative gross proceeds to the Company are equal to or greater than
$25 million and either the price per share paid in the Public Offering or the
Market Average Price is greater than (i) 1.5 times the then applicable
Conversion Price, if the Public Offering is consummated within 365 days of the
date hereof, (ii) 2.0 times the then applicable Conversion Price, if the Public
Offering is consummated between 366 and 730 days of the date hereof or (c) 2.5
times the then applicable Conversion Price, if the Public Offering is
consummated after 731 days of the date hereof.

         "Registrable Securities" means (i) any shares of Common Stock issued
or issuable upon exercise of the Series A Preferred Stock and (ii) any shares
of Common Stock issued or issuable directly or indirectly with respect to the
securities referred to in clause (i) by way of stock dividend or stock split or
in connection with a combination of shares, recapitalization, merger,
consolidation or other reorganization. As to any particular shares constituting
Registrable Securities, such shares will cease to be Registrable Securities
when they have been (x) effectively registered under the Securities Act and
disposed of in accordance with a registration statement covering them, or (y)
sold to the public pursuant to Rule 144 (or by similar provision under the
Securities Act).

         "S-C Investors" mean those Investors listed as the S-C Investors on
the signature pages hereto.

         "Securities Act" means the Securities Act of 1933, as amended, or any
similar federal law then in force.

         "Securities and Exchange Commission" means the Securities and Exchange
Commission and includes any governmental body or agency succeeding to the
functions thereof.

         "Securities Exchange Act" means the Securities Exchange Act of 1934,
as amended, or any similar federal law then in force.

         "Stockholder Shares" means (i) all Common Stock and/or Series A
Preferred Stock issued or issuable to the Original Holders or the Investors and
(ii) Common Stock and/or Series A Preferred Stock issued or issuable directly
or indirectly with respect to the securities referred to in clause (i) above by
way of stock dividend or stock split or in connection with a combination of
shares, recapitalization, merger, conversion, consolidation or other
reorganization.

                                       3
<PAGE>   4

         "Third Party" means any Person that is not an Affiliate or a member of
the Family Group, as appropriate, of the Company, the Original Holders or the
Investors.

         "Transfer" means to sell, transfer, assign, pledge or otherwise
dispose of any interest in any Stockholder Shares.

         "Underlying Shares" means (i) any Common Stock issued or issuable to
the Investors or the Original Holders, whether directly or by conversion
securities exercisable into Common Stock, and (ii) Common Stock issued or
issuable directly or indirectly with respect to the securities referred to in
clause (i) above by way of stock dividend or stock split or in connection with
a combination of shares, recapitalization, merger, conversion, consolidation or
other reorganization. As to any particular shares constituting Underlying
Shares, such shares will cease to be Underlying Shares when they have been (x)
effectively registered under the Security Act and disposed of in accordance
with a registration statement covering them, or (y) sold to the public pursuant
to Rule 144 (or by similar provision under the Securities Act). For purposes of
this Agreement, a Person will be deemed to be a holder of Underlying Shares
whenever such Person has the right to acquire directly or indirectly such
Underlying Shares (upon conversion or exercise in connection with a transfer of
securities or otherwise, but disregarding any restrictions or limitations upon
the exercise of such right), whether or not such acquisition has actually been
effected.

         "Warrant Registration Agreement" means the Warrant Registration Rights
Agreement, dated as of September 29, 1997, by and among the Company, Bear,
Stearns & Co. Inc. and Furman Selz LLC.

                                  ARTICLE II.

                    CORPORATE GOVERNANCE; VOTING AGREEMENTS

         SECTION 2.1           Board of Directors.

                  (a) The Company shall promptly take all necessary and
desirable actions within its control (including, without limitation, calling
special board and stockholder meetings), so that:

                  (i) any Investor or group of affiliated investors that
         purchased at least 857,142 shares of Preferred Stock shall be granted
         observation rights at all Board meetings; provided, however, that the
         observation rights granted hereunder shall only continue to be
         applicable to an Investor or group of affiliated Investors or a
         transferee of an Investor to the extent that such Investor or group of
         affiliated Investors or transferee holds at least 428,571 shares of
         Preferred Stock; and provided further, that observation rights will
         only be granted to a transferee engaged in the telecommunications
         industry with the consent of the Company, (not to be unreasonably
         withheld);

                                       4
<PAGE>   5


                  (ii)     The Board's compensation committee and audit
         committee shall each have three members. For so long as they own 50%
         of the Stockholder Shares issued on the date hereof, the JK&B
         Investors shall have the right to elect one of the three members. All
         decisions of the compensation committee with respect to the cash and
         non-cash compensation of the chairman of the board and president of
         the Company shall require the concurrence of the member of such
         committee elected by the JK&B Investors;

                  (iii)    the removal from the Board, the compensation
         committee or the audit committee (with or without cause) of any
         representative designated hereunder by the Investors shall be at the
         written request of the Investors, but only upon such written request
         and under no other circumstances; provided that the Board may remove
         any representative for cause;

                  (iv)     in the event that any representative designated
         hereunder for any reason ceases to serve as a member of a committee of
         the Board during his term of office, the resulting vacancy on such
         committee shall be filled by a representative designated by the
         Investors; and

                  (v)      the Company shall pay the reasonable out-of pocket
         expense incurred by each director in connection with any expenses
         incurred for Company business, including attendance at meeting;
         provided, however, that out-of-pocket expenses incurred by a director
         other than in connection with attendance at meetings of the Board or
         committees thereof shall be subject to the approval of the Company.

         (b)      The Investors agree that for so long as the JK&B Investors
and their Affiliates own at least 50% of the Stockholder Shares issued on the
date hereof, the JK&B Investors shall have the right to select the members of
the Board to be elected by the holders of Series A Preferred Stock. The JK&B
Investors hereby assign the right to select one such member to the S-C
Investors as long as the S-C Investors own at least 50% of the Stockholder
Shares issued to the S-C Investors on the date hereof.

         (c)      The rights of the Investors granted under this Section 2.1
shall terminate at such time as less than 50% of the Series A Preferred Stock
acquired under the Purchase Agreement remains outstanding.

                                  ARTICLE III.

         PREEMPTIVE RIGHTS; TRANSFER RESTRICTIONS AND OFFER PROCEDURES

         SECTION 3.1           Preemptive Rights.

                  (a) If the Company at any time after the date hereof
authorizes the issuance or sale of any New Securities (other than as a dividend
on the outstanding Common Stock), the Company shall first offer to sell to each
Investor a portion of such New Securities or other

                                       5
<PAGE>   6

securities equal to the percentage of outstanding shares of Common Stock held
by such Investor at the time of such issuance (determined on a fully diluted
basis).

                  (b)      In order to exercise its purchase rights hereunder,
each Investor must within 20 days after receipt of written notice from the
Company describing in reasonable detail the New Securities being offered, the
purchase price thereof, the payment terms and such Investor's percentage
allotment, deliver a written notice to the Company describing its election
hereunder. In the event any Investor does not elect to purchase all of the
shares offered to such Investors, the other electing Investors may purchase
such unallocated New Securities by providing notice to the Company within such
20-day period. Any New Securities not elected to be purchased by the end of
such 20-day period shall be reoffered for an additional 5-day period by the
Company on a pro rata basis to the Investors who elected to purchase all shares
of such New Securities originally offered to such Investors.

                  (c)      Upon the expiration of the offering periods
described above, the Company shall be entitled to sell such New Securities or
securities which the Investors have not elected to purchase during the 120 days
following such expiration on terms and conditions no more favorable to the
purchasers thereof than those offered to the Investors. Any New Securities
offered or sold by the Company to any Person after such 120-day period must be
reoffered to the Investors pursuant to the terms of this Section 3.1.

                  (d)      Termination of Restrictions. The provisions set
forth in Section 3.1 shall terminate upon the consummation of a Qualified
Public Offering.

         SECTION 3.2           Transfer Restrictions.

                  (a)      No Key Original Holder shall transfer any interest
in any Stockholder Shares except pursuant to and in accordance with the
provisions of this Section 3.2.

                  (b)      If, at any time, a Key Original Holder wishes to
sell anyof its Stockholder Shares to a Third Party, such sale shall be made
pursuant to the following procedures:

                  (i)      At least 20 days prior to making any Transfer of
         Stockholder Shares, any transferring Key Original Holder of
         Stockholder Shares (the "Transferring Holder") shall deliver a written
         notice (the "Offer Notice") to the Company and the Investors. The
         Offer Notice shall disclose in reasonable detail the proposed number
         of each class of Stockholder Shares to be transferred (the
         "Stockholder Transfer Shares") and the proposed terms and conditions
         of the Transfer (including the proposed price at which the shares are
         to be transferred).

                  (ii)     Each Investor shall be entitled to purchase all (but
         not less than all) of his Pro Rata Share (as defined below) of the
         Stockholder Transfer Shares specified in the Offer Notice at the price
         and on the terms specified therein by delivering written notice of
         such election (an "Election Notice") to the Transferring Holder as
         soon as practical but in any event within 10 days after delivery of
         the Offer Notice. Any Stockholder Transfer

                                       6
<PAGE>   7


Shares not elected to be purchased by the end of such 10-day period shall be
reoffered for an additional 10-day period by the Transferring Holder on a pro
rata basis to the Investors who have elected to purchase their Pro Rata Share.
Each Investor's "Pro Rata Share" shall be based upon such Investor's
proportionate ownership of the Underlying Shares to the Underlying Shares owned
by all Investors. The Investors shall only have the right to purchase
Stockholder Transfer Shares if they agree to purchase all of the Stockholder
Transfer Shares being offered.

         (iii)    The Transfer of any Stockholder Transfer Shares to be
purchased by the Investors shall be consummated as soon as practical after the
delivery of the final Election Notice, but in any event within 15 days after
the delivery of the final Election Notice. In the event that the Investors do
not elect to purchase all of the Stockholder Transfer Shares or fail to
consummate the purchase within the time frames specified herein, the
Transferring Holder may, within 90 days after the expiration of the last 10-day
period pursuant to clause (ii) above and subject to the provisions of Section
3.4 below, transfer such remaining Stockholder Transfer Shares to one or more
third parties at a price no less than the price per share specified in the
Offer Notice for such class and on other terms no more favorable to the
transferees thereof than offered to the Investors in the Offer Notice. Any
Stockholder Transfer Shares not transferred within such 90-day period shall be
reoffered to the Investors under this Section 3.2(b) prior to any subsequent
Transfer pursuant to the terms of this Section. The purchase price specified in
any Offer Notice shall be payable solely in cash at the closing of the
transaction.

         (iv)     At any closing under this Section 3.2(b), each Transferring
Holder will deliver to the relevant purchaser good and valid title to the
Underlying Shares being sold by each such Transferring Holder, free and clear
of any lien.

         (v)      In the event the consideration for the Stockholder Shares as
disclosed in the Offer Notice is other than cash, a promissory note or a
combination thereof, the price for the Stockholder Shares shall be the value of
that consideration as agreed to by the Key Original Holder and the Investors,
or, if no agreement can be reached as to the valuation of such consideration,
the fair market value of such consideration as determined by two appraisers
(one appointed by the Key Original Holder and one appointed by the Investors).
In the event the two appraisers are unable to agree on a fair market value
within 20 days after they are appointed and further negotiations, in the
opinion of either of the appraisers, would not result in an agreement, the fair
market value of the consideration shall be the average of the appraised values
of the two appraisers; provided, however, that if the appraised values of the
two appraisers differ by more than ten percent (10%) of the higher of the two
appraised values, the two respective appointed appraisers shall select a third
appraiser who shall independently, within 20 days after his appointment, make a
determination of the value of the consideration and the average of the
appraised values of the three appraisers shall be the purchase price and shall
be binding on the parties hereto. The Key Original Holder whose Stockholder
Shares are subject to the Offer Notice and the Investors shall each bear the
cost of their respective appraisers and shall share the cost equally of the
third appraiser, if any. Notwithstanding


                                       7

<PAGE>   8

         anything herein to the contrary, if an appraisal is used to determine
         the value of the consideration pursuant to this Section 3.2(b), the
         time periods provided for in this Section 3.2(b) shall be tolled from
         the time of the initial appointment of the two appraisers until a
         final appraised value is determined pursuant to this Section
         3.2(b)(v).

                  (c)      Permitted Transferees. The restrictions set forth in
Section 3.2(b) shall not apply to (i) any transfer of Stockholder Shares by any
Original Holder or Investor among its Affiliates or (ii) a transfer of
Stockholder Shares by any Original Holder or Investor pursuant to the laws of
descent and distribution or among the Family Group of such Original Holder or
Investor; provided that the provisions of this Agreement will continue to be
applicable to the Stockholder Shares after any transfer pursuant to clauses (i)
and (ii) above and the transferees of such Stockholder Shares shall agree in
writing to be bound by the provisions of this Agreement.

                  (d)      Termination of Restrictions. The restrictions set
forth in Section 3.2(b) shall terminate upon the consummation of a Qualified
Public Offering; provided, however, that, upon the consummation of a Public
Offering, the restrictions set forth in Section 3.2(b) shall not apply with
respect to sales in any 90 day period by a Key Original Holder to the extent
that such shares could be sold by such Key Original Holder pursuant to Rule 144
under the Securities Act if the volume limitations contained therein were
applicable.

         SECTION 3.3    Legends. Each certificate evidencing outstanding
Stockholder Shares held by the Original Holders and the Investors shall bear a
legend in substantially the following form:

                  THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
                  REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED.
                  THESE SHARES MAY NOT BE SOLD OR OFFERED FOR SALE UNLESS THERE
                  IS AN EFFECTIVE REGISTRATION STATEMENT IN EFFECT UNDER SAID
                  ACT, OR UNLESS AN EXCEPTION FROM REGISTRATION IS AVAILABLE.

                  THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
                  RESTRICTIONS ON TRANSFER AS SET FORTH IN THE STOCKHOLDERS
                  AGREEMENT DATED AS OF NOVEMBER 26, 1997, COPIES OF WHICH WILL
                  BE FURNISHED BY MGC COMMUNICATIONS, INC. AND ANY SUCCESSOR
                  THERETO UPON REQUEST AND WITHOUT CHARGE.

         SECTION 3.4     Tag Along Rights.

                  (a)      If any Key Original Holder proposes to sell, in one
transaction or in a series of related transactions (a "Tag Along Sale") any
Stockholder Shares to any Third Party, the Investors shall have the right to
participate in such Tag Along Sale on the following terms:

                  (i)      Such Key Original Holder, shall give the Investors
not less than 20 days' written notice (a "Sale Notice") of its intention,
describing the price offered, all other

                                       8
<PAGE>   9

         material terms and conditions of the Tag Along Sale and, if the
         consideration payable pursuant to the Tag Along Sale consists in whole
         or in part of consideration other than cash, such information relating
         to such other consideration as Investors may reasonably request and
         which is available to such selling Key Original Holder.

                  (ii)     In connection with any Tag Along Sale, each Investor
         shall have the right, in its sole discretion, to sell, for the same
         price per share being paid to, and otherwise on the same terms and
         conditions, as the selling Key Original Holder, its pro rata portion
         of Stockholder Shares determined by multiplying the number of
         Underlying Shares being sold in the Tag Along Sale by a fraction, the
         numerator of which is the number of Underlying Shares held by such
         Investor and the denominator of which is the number of Underlying
         Shares held by all Investors and by the Key Original Holder delivering
         the Sale Notice.

                  (iii)    Investors must exercise their tag along right by
         giving written notice to the selling Key Original Holder within 20
         days of the delivery of a Sale Notice, specifying the number of
         Stockholder Shares that each Investor desires to include in the Tag
         Along Sale. At the closing for the Tag Along Sale, against payment of
         purchase price for the Stockholder Shares to be sold by Investors,
         Investors will deliver to the Third Party the certificate or
         certificates representing such number of Investor Shares, duly
         endorsed, together with all other documents which are necessary in
         order to effect such Tag Along Sale. Each selling Key Original Holder
         shall use its best efforts to obtain the agreement of the prospective
         transferee(s) to the participation of the participating Investors in
         any contemplated Tag Along Sale, and no Key Original Holder shall
         transfer any of its Stockholder Shares to any prospective transferee
         if such prospective transferee declines to allow the participation of
         the Investors.

                  (b)      The rights and obligations set forth in this Section
3.4 shall terminate upon the consummation of a Qualified Public Offering;
provided, however, that, upon consummation of a Public Offering, the rights and
obligations set forth in this Section 3.4 shall not apply with respect to sales
in any 90 day period by a Key Original Holder to the extent that such shares
could be sold by such Key Original Holder pursuant to Rule 144 under the
Securities Act if the volume limitations contained therein were applicable.

                                  ARTICLE IV.

                              REGISTRATION RIGHTS

         SECTION 4.1           Demand Registrations.

                  (a)      Requests for Registration. The Majority Investor
Holders may request, at any time after 180 days after the Company's initial
Public Offering, registration under the Securities Act of all or part of their
Registrable Securities on Form S-1, or any similar long-form registration
("Long-form Registration"), or, if available on Form S-2 or S-3 or any similar
short-form of registration ("Short-Form Registration"); provided that the
aggregate offer price of all 

                                       9
<PAGE>   10

such Registrable Securities being registered is at least $10 million. Each
request for a Demand Registration shall specify the number of Registrable
Securities requested to be registered, and the proposed underwriter. Within ten
days after receipt of any such request, the Company will give written notice of
such requested registration to all other holders (if any) of Registrable
Securities and, subject to paragraph 1(e) below, will include in such
registration all Registrable Securities with respect to which the Company has
received written requests for inclusion therein within 15 days after the
receipt of the Company's notice. All registrations requested pursuant to this
paragraph 1(a) are referred to herein as "Demand Registrations."

                  (b)      Long-Form Registrations. The Majority Investor
Holders will be entitled to request two (2) Demand Registrations in which the
Company will pay all Registration Expenses. A registration will not count as
one of such two (2) Demand Registrations until it has become effective or the
demanding Investors withdraw their request (unless such withdrawal is due to a
material adverse change in the business, operations, prospects or condition
(financial or otherwise) of the Company since the date of such demand). The
Company will pay all Registration Expenses in connection with any initiated
registration whether or not it has become effective unless the respective
Investors withdraw their request (unless such withdrawal is pursuant to the
provisions of Section 1(e) hereunder or due to a material adverse change in the
business, operations, prospects or condition (financial or otherwise) of the
Company since the date of such Demand).

                  (c)      Short-Form Registrations. In addition to the
Long-Form Registrations provided pursuant to paragraph 1(b), the Majority
Investor Holders will be entitled to request unlimited Short-Form Registration,
provided that the aggregate offering value of the Registrable Securities
requested to be registered in any Short-Form Registration must equal at least
$500,000 and that of the Majority Investor Holders may only request two
Short-Form Registrations in any 12-month period. After the Company has become
subject to the reporting requirements of the Securities Exchange Act, the
Company will use its best efforts to make Short-Form Registrations available
for the sale of Registrable Securities. The Company will pay all Registration
Expenses with respect to Short-Form Registrations. The rights of a holder of
Registrable Securities under this Section 4.1(c) shall expire at such time as
the Registrable Securities of such holder are transferable without restriction
as to volume under Rule 144 under the Securities Act.

                  (d)      Priority on Demand Registrations. If a Demand
Registration is an underwritten offering and the managing underwriters advise
the Company in writing that in their opinion the number of Registrable
Securities and, if permitted hereunder, other securities requested to be
included in such offering exceeds the number of Registrable Securities and
other securities, if any, which can be sold therein without adversely affecting
the marketability of the offering (the "Offering Quantity"), the Company will
include in such registration securities in the following priority:

                           (a)      first, before including any securities
         which are not Registrable Securities held by the Majority Investor
         Holders, the Company will include all of the Registrable Securities
         requested to be included by such holders thereof, and if the number of
         Registrable Securities requested to be included exceeds the Offering
         Quantity, then the

                                      10
<PAGE>   11

         Company shall include only each such requesting holder's pro rata
         share of the Offering Quantity, based on the amount of Registrable
         Securities held by such holder; and (b) second, to the extent (and
         only to the extent) that the Offering Quantity exceeds the aggregate
         amount of Registrable Securities which are requested to be included in
         such registration, the Company shall include in such registration any
         other securities requested to be included in the offering.

Any Persons other than holders of Registrable Securities who participate in
Demand Registrations which are not at the Company's expense must pay their
share of the Registration Expenses as provided in Section 5 hereof.

                  (e)      Restrictions on Demand Registrations. The Company
will not be obligated to effect any Demand Registration within 90 days after
the effective date of a previous Demand Registration. The Company may postpone
upon one occasion in any 365 day period for up to 120 days the filing or the
effectiveness of a registration statement for a Demand Registration if the
Company determines in its good faith judgment that such Demand Registration
would reasonably be expected to have a material adverse effect on any proposal
or plan by the Company or any of its subsidiaries to engage in any acquisition
of assets or shares of unrelated companies (other than in the ordinary course
of business) or any merger, consolidation, tender offer or similar transaction
In the case such event, the holders of a majority of Registrable Securities
requesting such Demand Registration will be entitled to withdraw such request
and, if such request is withdrawn, such Demand Registration will not count as
one of the permitted Demand Registrations hereunder and the Company will pay
all Registration Expenses in connection with such registration.

                  (f)      Selection of Underwriters. The holders of a majority
of the Registrable Securities initiating any Demand Registration will have the
right to select the investment banker(s) and manager(s) to administer the
offering, subject to the Company's approval which will not be unreasonably
withheld.

                  (g)      Other Registration Rights. Except as provided in
this Agreement, the Company will not grant to any Persons the right to request
the Company to register any equity securities of the Company, or any securities
convertible or exchangeable into or exercisable for such securities which
contains terms or conditions more favorable than the terms or conditions
contained in this Agreement, without the prior written consent of Investors
holding a majority of the outstanding Stockholder Shares held by all Investors.

         SECTION  4.2 Piggyback Registrations.

                  (a)      Right to Piggyback. Whenever the Company proposes to
register any of its securities under the Securities Act (other than pursuant to
a Demand Registration or a registration on Form S-4 or S-8 or any successor or
similar forms) and the registration form to be used may be used for the
registration of Registrable Securities (a "Piggyback Registration"), whether or
not for sale for its own account, the Company will give prompt written notice
to all holders of Registrable Securities of its intention to effect such a
registration and will include in

                                      11
<PAGE>   12

such registration all Registrable Securities with respect to which the Company
has received written requests for inclusion therein within 20 days after the
receipt of the Company's notice; provided, however, that the rights of a holder
of Registrable Securities under this Section 4.2 shall expire upon the earlier
to occur of (i) such time as the Registrable Securities of such holder are
transferable without restriction as to volume under Rule 144 under the
Securities Act and (ii) five years after a Qualified Public Offering.

                  (b)      Piggyback Expenses. The Registration Expenses of the
holders of Registrable Securities will be paid by the Company in all Piggyback
Registrations.

                  (c)      Priority on Registrations. If a Piggyback
Registration is an underwritten primary registration on behalf of the Company
or an underwritten offering undertaken by the Company pursuant to a demand
registration exercised by a Person other than the Investors (a "Demanding
Party"), and the managing underwriters advise the Company in writing (with a
copy to each party hereto requesting registration of Registrable Securities)
that in their opinion the number of securities requested to be included in such
registration exceeds the number which can be sold in such offering without
adversely affecting the marketability of such offering (the "Company Offering
Quantity"), the Company will include in such registration securities in the
following priority:

                  (i)      first, the securities the Company proposes to sell
         and the securities requested to be included by the Demanding Party in
         accordance with any agreement between the Company and the Demanding
         Party; and

                  (ii)     second, the Company will include all Registrable
         Securities requested to be included by any holders thereof and all
         other holders of registrable securities, and if the number of such
         holders' securities requested to be included exceeds the Company
         Offering Quantity, then the Company shall include only each such
         requesting holder's pro rata share of the Company Offering Quantity
         (remaining after sales covered by (i) and (ii) above), based on the
         amount of securities held by such holder.

                  (d)      Other Registrations. If the Company has previously
         filed a registration statement with respect to Registrable Securities
         pursuant to Section 4.1 or pursuant to this Section 4.2, and if such
         previous registration has not been withdrawn or abandoned, the Company
         will not file or cause to be effected any other registration of any of
         its equity securities or securities convertible or exchangeable into
         or exercisable for its equity securities under the Securities Act
         (except on Form S-4 or S-8 or any successor form), whether on its own
         behalf or at the request of any holder or holders of such securities,
         until a period of at least 90 days has elapsed from the effective date
         of such previous registration.

                  SECTION  4.3     Holdback Agreements.

                  (a)      To the extent not inconsistent with applicable law,
         each Investor agrees not to effect any public sale or distribution
         (including sales pursuant to Rule 144) of equity securities of the
         Company, or any securities, options or rights convertible into or
         exchangeable or


                                      12
<PAGE>   13

exercisable for such securities that such Investor owns prior to the effective
date of any underwritten registration, during the seven days prior to and the
120-day period beginning on the effective date of any underwritten
registration, unless the underwriters managing the registered public offering
otherwise agree; provided that such restrictions shall not be more restrictive
in duration or scope than restrictions imposed on (i) any Person which has been
granted registration rights by the Company, (ii) any officer or director of the
Company or (iii) any 5% holder of securities of the Company.

                  (b)      The Company agrees (i) not to effect any public sale
or distribution of its equity securities, or any securities convertible into or
exchangeable or exercisable for such securities, during the seven days prior to
and during the 120-day period beginning on the effective date of any
underwritten Demand Registration or any underwritten Piggyback Registration
(except as part of such underwritten registration or pursuant to registrations
on Form S-4 or S-8 or any successor form), unless the underwriters managing the
registered public offering otherwise agree, and (ii) to cause each holder of
its Common Stock, or any securities convertible into or exchangeable or
exercisable for Common Stock, purchased from the Company at any time after the
date of this Agreement (other than in a registered public offering or pursuant
to a stock option plan adopted by the Company or upon the exercise of warrants
outstanding as of the date of this Agreement, unless such holder is a party to
this Agreement) to agree not to effect any public sale or distribution
(including sales pursuant to Rule 144) of any such securities during such
period (except as part of such underwritten registration, if otherwise
permitted), unless the underwriters managing the registered public offering
otherwise agree.

         SECTION 4.4 Registration Procedures. Whenever the Investors have
requested that any Registrable Securities be registered pursuant to this
Agreement, the Company will use its best efforts to effect the registration and
the sale of such Registrable Securities in accordance with the intended method
of disposition thereof, and pursuant thereto the Company will as expeditiously
as possible:

         (a)      prepare and within 60 days (or 45 days with respect to any
Short-Form Registration) after the end of the period within which requests for
registration may be given to the Company and file with the Securities and
Exchange Commission a registration statement with respect to such Registrable
Securities and thereafter use its best efforts to cause such registration
statement to become effective (provided that before filing a registration
statement or prospectus or any amendments or supplements thereto, the Company
will furnish to the counsel selected by the holders of a majority of the
Registrable Securities initiating such registration statement copies of all
such documents proposed to be filed, which documents will be subject to review
of such counsel);

         (b)      prepare and file with the Securities and Exchange Commission
such amendments and supplements to such registration statement and the
prospectus used in connection therewith as may be necessary to keep such
registration statement effective for a period of either (i) not less than 180
days (subject to extension pursuant to Section 4.7(b)) or, if such registration
statement relates to an underwritten offering, such longer period as in the
opinion of counsel for the underwriters a prospectus is required by law to be
delivered in 

                                      13
<PAGE>   14

connection with sales of Registrable Securities by an underwriter or dealer or
(ii) such shorter period as will terminate when all of the securities covered
by such registration statement have been disposed of in accordance with the
intended methods of disposition by the seller or sellers thereof set forth in
such registration statement (but in any event not before the expiration of any
longer period required under the Securities Act), and to comply with the
provisions of the Securities Act with respect to the disposition of all
securities covered by such registration statement until such time as all of
such securities have been disposed of in accordance with the intended methods
of disposition by the seller or sellers thereof set forth in such registration
statement;

         (c)      furnish to each seller of Registrable Securities such number
of copies of such registration statement, each amendment and supplement
thereto, the prospectus included in such registration statement (including each
preliminary prospectus) and such other documents as such seller may reasonably
request in order to facilitate the disposition of the Registrable Securities
owned by such seller;

         (d)      use its best efforts to register or qualify such Registrable
Securities under such other securities or blue sky laws of such jurisdictions
as any seller reasonably requests and do any and all other acts and things
which may be reasonably necessary or advisable to enable such seller to
consummate the disposition in such jurisdictions of the Registrable Securities
owned by such seller (provided that the Company will not be required to (i)
qualify generally to do business in any jurisdiction where it would not
otherwise be required to qualify but for this subparagraph, (ii) subject itself
to taxation in any such jurisdiction or (iii) consent to general service of
process in any such jurisdiction);

         (e)      notify each seller of such Registrable Securities, at any
time when a prospectus relating thereto is required to be delivered under the
Securities Act, of the happening of any event (a "Changing Event") as a result
of which, the prospectus included in such registration statement contains an
untrue statement of a material fact or omits any fact necessary to make the
statements therein not misleading in the light of the circumstances under which
they were made, and, at the request of any such seller, the Company will as
soon as possible prepare and furnish to such seller (a "Correction Event") a
reasonable number of copies of a supplement or amendment to such prospectus so
that, as thereafter delivered to the purchasers of such Registrable Securities,
such prospectus will not contain an untrue statement of a material fact or omit
to state any fact necessary to make the statements therein not misleading in
the light of the circumstances under which they were made;

         (f)      use its best efforts to cause all such Registrable Securities
to be listed on each securities exchange on which similar securities issued by
the Company are then listed and, if not so listed, to be listed on the NASD
automated quotation system;

         (g)      provide a transfer agent and registrar for all such
Registrable Securities not later than the effective date of such registration
statement;

                                      14
<PAGE>   15

         (h)      enter into such customary agreements (including underwriting
agreements in customary form) and take all such other actions as the holders of
a majority of the Registrable Securities being sold or the underwriters, if
any, reasonably request in order to expedite or facilitate the disposition of
such Registrable Securities;

         (i)      make available for inspection by any seller of Registrable
Securities, any underwriter participating in any disposition pursuant to such
registration statement, any accountant or other agent retained by any such
seller or underwriter and one firm of attorneys representing the holders of
Registrable Securities, all financial and other records, pertinent corporate
documents and properties of the Company, and cause the Company's officers,
directors, employees and independent accountants to supply all information
reasonably requested by any such seller, underwriter, attorney, accountant or
agent in connection with such registration statement;

         (j)      otherwise use its best efforts to comply with all applicable
rules and regulations of the Securities and Exchange Commission, and make
available to its security holders, as soon as reasonably practicable, an
earnings statement covering the period of at least twelve months beginning with
the first day of the Company's first full calendar quarter after the effective
date of the registration statement, which earnings statement shall satisfy the
provisions of Section 11(a) of the Securities Act and Rule 158 thereunder;

         (k)      in the event of the issuance of any stop order suspending the
effectiveness of a registration statement, or of any order suspending or
preventing the use of any related prospectus or suspending the qualification of
any securities included in such registration statement for sale in any
jurisdiction, the Company will use its reasonable best efforts promptly to
obtain the withdrawal of such order;

         (l)      use its best efforts to obtain one or more comfort letters,
dated the effective date of such registration statement (and, if such
registration includes an underwritten public offering, dated the date of the
closing under the underwriting agreement), signed by the Company's independent
public accountants in customary form and covering such matters of the type
customarily covered by comfort letters as the holders of a majority of the
Registrable Securities being sold reasonably request; and

         (m)      use its best efforts to provide a legal opinion of the
Company's outside counsel, dated the effective date of such registration
statement (or, if such registration includes an underwritten public offering,
dated the date of the closing under the underwriting agreement), with respect
to the registration statement, each amendment and supplement thereto, the
prospectus included therein (including the preliminary prospectus) and such
other documents relating thereto in customary form and covering such matters of
the type customarily covered by legal opinions of such nature.

The Company may require each seller of Registrable Securities as to which any
registration is being effected to furnish the Company such information
regarding such seller and the

                                       15
<PAGE>   16

distribution of such securities as the Company may from time to time reasonably
request in writing.

         SECTION  4.5 Registration Expenses.

                  (a)      All expenses incident to the Company's performance
of or compliance with this Agreement, including, without limitation, all
registration and filing fees, fees and expenses of compliance with securities
or blue sky laws, printing expenses, messenger and delivery expenses, and fees
and disbursements of counsel for the Company and all in-dependent certified
public accountants, underwriters (excluding discounts and commissions, which
will be paid by the sellers of Registrable Securities) and other Persons
retained by the Company (all such expenses being herein called "Registration
Expenses"), will be borne as provided in this Agreement, and the Company will,
in any event, pay its internal expenses (including, without limitation, all
salaries and expenses of its officers and employees performing legal or
accounting duties), the expense of any annual audit or quarterly review, the
expense of any liability insurance and the expenses and fees for listing the
securities to be registered on each securities exchange on which similar
securities issued by the Company are then listed or on the NASD automated
quotation system.

                  (b)      In connection with each Demand Registration and each
Piggyback Registration, the Company will reimburse the Investors covered by
such registration for the reasonable fees and disbursements of one counsel
chosen by the holders of a majority of the Registrable Securities initiating
such registration.

         SECTION  4.6 Indemnification.

                  (a)      The Company agrees to indemnify and hold harmless,
to the extent permitted by law, each Investor, its officers and directors and
each Person who controls such Investor (within the meaning of the Securities
Act) against any losses, claims, damages, liabilities, joint or several, to
which such Investor or any such director or officer or controlling person may
become subject under the Securities Act or otherwise, insofar as such losses,
claims, damages or liabilities (or actions or proceedings, whether commenced or
threatened, in respect thereof) arise out of or are based upon (i) any untrue
or alleged untrue statement of material fact contained in any registration
statement, prospectus or preliminary prospectus or any amendment thereof or
supplement thereto or, (ii) any omission or alleged omission of a material fact
required to be stated therein or necessary to make the statements therein not
misleading, and the Company will reimburse such Investor and each such
director, officer and controlling person for any legal or any other expenses
incurred by them in connection with investigating or defending any such loss,
claim, liability, action or proceeding; provided, however, that the Company
shall not be liable in any such case to the extent that any such loss, claim,
damage, liability (or action or proceeding in respect thereof) or expense
arises out of or is based upon an untrue statement or alleged untrue statement,
or omission or alleged omission, made in such registration statement, any such
prospectus or preliminary prospectus or any amendment or supplement thereto, or
in any application, in reliance upon, and in conformity with, written
information prepared and furnished to the Company by such Investor expressly
for use therein or by such Investor's failure

                                      16
<PAGE>   17

to deliver a copy of the registration statement or prospectus or any amendments
or supplements thereto after the Company has furnished such Investor with a
sufficient number of copies of the same. In connection with an underwritten
offering, the Company will indemnify such underwriters, their officers and
directors and each Person who controls such underwriters (within the meaning of
the Securities Act) to the same extent as provided above with respect to the
indemnification of the Investors.

                  (b)      In connection with any registration statement in
which an Investor is participating, each such Investor will furnish to the
Company in writing such information and affidavits as the Company reasonably
requests for use in connection with any such registration statement or
prospectus and, to the extent permitted by law each such Investor, severally,
for itself only, will indemnify and hold harmless the Company, its directors
and officers and each other Person who controls the Company (within the meaning
of the Securities Act) against any losses, claims, damages, liabilities, joint
or several, to which the Company or any such director or officer or controlling
person may become subject under the Securities Act or otherwise, insofar as
such losses, claims, damages or liabilities (or actions or proceedings, whether
commenced or threatened, in respect thereof) or expenses arise out of or are
based upon (i) the purchase or sale of Registrable Securities during any period
beginning upon a Changing Event (as defined in Section 4.4(e)) and ending on a
Correction Event (as defined in Section 4.4(e)), provided such Holder received
proper written notice of such Changing Event pursuant to Section 4.4(e), (ii)
any untrue or alleged untrue statement of material fact contained in the
registration statement, prospectus or preliminary prospectus or any amendment
thereof or supplement thereto or in any application, or (iii) any omission or
alleged omission of a material fact required to be stated therein or necessary
to make the statement therein not misleading, but, with respect to clauses (ii)
and (iii) above, only to the extent that such untrue statement or omission is
made in such registration statement, any such prospectus or preliminary
prospectus or any amendment or supplement thereto, or in any application, in
reliance upon and in conformity with written information prepared and furnished
to the Company by such Investor expressly for use therein, and such Investor
will reimburse the Company and each such director, officer and controlling
Person for any legal or any other expenses incurred by them in connection with
investigating or defending any such loss, claim, liability, action or
proceeding; provided, however, that the obligation to indemnify will be
individual to each Investor and will be limited to the net amount of proceeds
received by such Investor from the sale of Registrable Securities pursuant to
such registration statement.

                  (c)      Any Person entitled to indemnification hereunder
will (i) give prompt written notice to the indemnifying party of any claim with
respect to which it seeks indemnification (provided that the failure to give
prompt notice shall not impair any Person's right to indemnification hereunder
to the extent such failure has not materially prejudiced the indemnifying
party) and (ii) unless in such indemnified party's reasonable judgment a
conflict of interest between such indemnified and indemnifying parties may
exist with respect to such claim, permit such indemnifying party to assume the
defense of such claim with counsel reasonably satisfactory to the indemnified
party. Such indemnifying party shall not, however, enter into any settlement
with a party without obtaining an unconditional release of each indemnified
party by such party with respect to any and all claims against each indemnified
party. If such defense is

                                      17
<PAGE>   18

assumed, the indemnifying party will not be subject to any liability for any
settlement made by the indemnified party without its consent (but such consent
will not be unreasonably withheld). An indemnifying party who is not entitled
to, or elects not to, assume the defense of a claim will not be obligated to
pay the fees and expenses of more than one counsel for all parties indemnified
by such indemnifying party with respect to such claim, unless in the reasonable
judgment of any indemnified party a conflict of interest may exist between such
indemnified party and any other of such indemnified parties with respect to
such claim.

                  (d)      The indemnification provided for under this
Agreement will remain in full force and effect regardless of any investigation
made by or on behalf of the indemnified party or any officer, director or
controlling Person of such indemnified party and will survive the transfer of
securities. The Company also agrees to make such provisions, as are reasonably
requested by any indemnified party, for contribution to such party in the event
the Company's indemnification is unavailable for any reason.

         SECTION  4.7 Participation in Underwritten Registrations.

                  (a)       No Person may participate in any registration
hereunder which is underwritten unless such Person (i) agrees to sell such
Person's securities on the basis provided in any underwriting arrangements
approved by the Person or Persons entitled hereunder to approve such
arrangements (including, without limitation, pursuant to the terms of any
overallotment or "green shoe" option requested by the managing underwriter(s),
provided that no Investor will be required to sell more than the number of
Registrable Securities that such holder has requested the Company to include in
any registration) and (ii) completes and executes all questionnaires, powers of
attorney, indemnities, underwriting agreements and other documents reasonably
required under the terms of such underwriting arrangements.

                  (b)       Each Person that is participating in any
registration hereunder agrees that, upon receipt of any notice from the Company
of the happening of any event of the kind described in Section 4.4(e) above,
such Person will forthwith discontinue the disposition of its Registrable
Securities pursuant to the registration statement until such Person's receipt
of the copies of a supplemented or amended prospectus as contemplated by such
Section 4.4(e). In the event the Company shall give any such notice, the
applicable time period mentioned in Section 4.4(b) during which a Registration
Statement is to remain effective shall be extended by the number of days during
the period from and including the date of the giving of such notice pursuant to
this paragraph to and including the date when each seller of a Registrable
Security covered by such registration statement shall have received the copies
of the supplemented or amended prospectus contemplated by Section 4.4(e).

         SECTION 4.8        Current Public Information. At all times after the
Company has filed a registration statement with the Securities and Exchange
Commission pursuant to the requirements of either the Securities Act or the
Securities Exchange Act, the Company will file all reports required to be filed
by it under the Securities Act and the Securities Exchange Act and the rules
and regulations adopted by the Securities and Exchange Commission thereunder,
and will use commercially reasonable best efforts to take such further action
as any Investor may

                                      18
<PAGE>   19

reasonably request, all to the extent required to enable such Investors to sell
Registrable Securities pursuant to Rule 144 adopted by the Securities and
Exchange Commission under the Securities Act (as such rule may be amended from
time to time) or any similar rule or regulation hereafter adopted by the
Securities and Exchange Commission.

         SECTION 4.9     Adjustment Affecting Registrable Securities. Except as
otherwise provided herein, the Company will not take any action, or permit any
change to occur, with respect to its securities which would materially and
adversely affect the ability of the Investors to include such Registrable
Securities in a registration undertaken pursuant to this Agreement or which
would adversely affect the marketability of such Registrable Securities in any
such registration.

                                   ARTICLE V.

                                 MISCELLANEOUS

         SECTION 5.1     Transfers in Violation of Agreement. Any transfer or
attempted transfer of any Stockholder Shares in violation of any provision of
this Agreement shall be void, and the Company shall not record such transfer on
its books or treat any purported transferee of such Stockholder Shares as the
owner of such shares for any purpose.

         SECTION 5.2     Amendment and Waiver. Except as otherwise provided
herein, no modification, amendment or waiver of any provision of this Agreement
shall be effective against any party hereto unless such modification, amendment
or waiver is approved in writing by Key Original Holders holding a majority of
the outstanding Stockholder Shares held by all Key Original Holders and
Investors holding a majority of the outstanding Stockholder Shares held by all
Investors. Notwithstanding the foregoing, the Company shall cause any Person
that acquires shares of Series A Preferred Stock after the date hereof to
execute an appropriate supplement to this Agreement pursuant to which such
Person becomes an "Investor" for all purposes hereunder and such supplement
shall not require the approval of any Key Original Holder or Investor.

         SECTION 5.3     Severability. Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid
under applicable law, but if any provision of this Agreement is held to be
invalid, illegal or unenforceable in any respect under any applicable law or
rule in any jurisdiction, such invalidity, illegality or unenforceability shall
not affect any other provision or the effectiveness or validity of such
provision in any other jurisdiction, and this Agreement shall be reformed,
construed and enforced in such jurisdiction as if such invalid, illegal or
unenforceable provision had never been contained herein.

         SECTION 5.4     Entire Agreement. Except as otherwise expressly set
forth herein, this document and the Purchase Agreement embody the complete
agreement and understanding among the parties hereto with respect to the
subject matter hereof and supersede and preempt any prior understandings,
agreements or representations by or among the parties, written or oral, which
may have related to the subject matter hereof in any way.

                                      19
<PAGE>   20

         SECTION 5.5     Successors and Assigns. The provisions of this
Agreement (including the registration rights contained in Article IV) shall be
binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns, and to the extent applicable heirs,
executors, administrators and legal representatives and any subsequent holders
of Stockholder Shares and the respective successors and assigns of each of
them, so long as they hold Stockholder Shares.

         SECTION 5.6     Counterparts. This Agreement may be executed in 
separate counterparts each of which shall be an original and all of which taken
together shall constitute one and the same agreement.

         SECTION 5.7     Remedies. The parties hereto agree and acknowledge that
money damages may not be an adequate remedy for any breach of the provisions of
this Agreement and that the parties hereto shall have the right to injunctive
relief, in addition to all of its rights and remedies at law or in equity, to
enforce the provisions of this Agreement. Nothing contained in this Agreement
shall be construed to confer upon any Person who is not a signatory hereto any
rights or benefits, as a third party beneficiary or otherwise.

         SECTION 5.8     Notices. All notices, demands or other communications
to be given or delivered under or by reason of the provisions of this Agreement
shall be in writing and shall be deemed to have been given when personally
delivered or received by certified mail, return receipt requested, confirmed
telecopy or sent by guaranteed overnight courier service. Such notices, demands
and other communications will be sent to the parties as indicated below, or to
any party (including any new party) at such address or to the attention of such
other person as the recipient party has specified by prior written notice to
the sending party.

         SECTION 5.9     Governing Law. The corporate law of Nevada will govern
all issues concerning the relative rights of the Company and its stockholders.
All other issues concerning this Agreement shall be governed by and construed
in accordance with the laws of the State of New York, without giving effect to
any choice of law or conflict of law provision or rule (whether of the State of
New York or any other jurisdiction) that would cause the application of the law
of any jurisdiction other than the State of New York.

         SECTION 5.10    Descriptive Headings. The descriptive headings of this
Agreement are inserted for convenience only and do not constitute a part of
this Agreement.

                                      20
<PAGE>   21


                     STOCKHOLDERS AGREEMENT SIGNATURE PAGES

         IN WITNESS WHEREOF, the parties, by their respective officers duly
authorized, have caused this Agreement to be duly executed and delivered as of
the date hereof.

                               MGC COMMUNICATIONS, INC.

                               By:
                                  -----------------------------------------
                                    Name:
                                    Title:

                           INVESTORS:

                               JK&B INVESTORS:

                                    JK&B CAPITAL, L.P.

                                    By:  JK&B Management, L.L.C.
                                    Its: General Partner

                                    By:
                                       ------------------------------------
                                       Name:   David Kronfeld
                                       Title:  Manager

                                    JK&B CAPITAL II, L.P.

                                    By: JK&B Management, L.L.C.
                                    Its: General Partner

                                    By:
                                       ------------------------------------
                                       Name:   David Kronfeld
                                       Title:  Manager



                                      S-1
<PAGE>   22


         S-C INVESTORS:

                     STRATEGIC INVESTMENT PARTNERS LIMITED

                     By:
                        ----------------------------------------
                        Name:
                        Title: Attorney-in-Fact

                     S-C PHOENIX HOLDINGS, L.L.C.


                     By:
                        ----------------------------------------
                        Name:
                        Title:

                      WINSTON PARTNERS II LDC

                      By:
                        ----------------------------------------
                        Name:
                        Title: Attorney-in-Fact

 
                      WINSTON PARTNER II LLC

                      By:  Chatterjee Advisors L.L.C.
                      Its: Manager

                      By:
                        ----------------------------------------
                        Name:
                        Title:  Manager

         OTHER INVESTORS:

                      WIND POINT PARTNERS III, L.P.

                      By: WIND POINT PARTNERS, LLC
                      Its: General Partner

                      By:
                        ----------------------------------------
                        Name:
                        Title:

                                      S-2
<PAGE>   23

                         BOSTON CAPITAL VENTURES III, L.P.

                         By:
                                 ----------------------------------------
                                 Name:
                                 Title: General Partner

                         FARLEY, INC.


                         By:
                                 ----------------------------------------
                                 Name:
                                 Title:

                         FRUIT OF THE LOOM, INC. SENIOR EXECUTIVE OFFICER
                         DEFERRED COMPENSATION TRUST

                         By:
                                 ----------------------------------------
                                 Name:
                                 Title:

                            ---------------------------------------------
                            William Farley


                            ---------------------------------------------
                            Robert W. Humes


                                      S-3
<PAGE>   24


                 WESTBURY CAPITAL PARTNERS, L.P.,
        
                        By: Wesbury MGP, L.P., its general partner
        
                            By: JK Fogg & Co. Incorporated, its general partner
        
                  By:
                     ------------------------------------------
                     Name:
                     Title:


        
                  ---------------------------------------------
                  Jeffrey H. Freed


        
                  ---------------------------------------------
                  Brett J. Rome
        
        
        
                                      S-4
<PAGE>   25



                                   EXHIBIT A

                                ORIGINAL HOLDERS


Maurice J. Gallagher, Jr.                            Key Original Holder
6900 Westcliff Drive
Suite 505
Las Vegas, NV 89128

Nield J. Montgomery                                  Key Original Holder
3301 North Buffalo
Las Vegas, NV 89129



                                      A-1
<PAGE>   26



                                   EXHIBIT B

                                   INVESTORS

Name of Purchaser

JK&B Capital, L.P.
JK&B Capital II, L.P.

205 North Michigan
Suite 808
Chicago, Ill 60601
Attn: David Kronfeld
Fax No.: (312) 946-1103

Strategic Investment Partners Limited
c/o Curacao Corporation
Company, N.V.
Kaya Flamboyan 9
Willemstad, Curacao
Netherlands Antilles
Facsimile No.: 011-599-9-322-001

With a copy to:

Soros Fund Management LLC
888 Seventh Avenue
New York, New York 10106
Attention: Michael C. Neus
Facsimile No.: (212) 664-0544

S-C Phoenix Holdings, L.L.C.
c/o Soros Fund Management LLC
888 Seventh Avenue
New York, New York 10106
Facsimile No.: 212-664-0544
Attention: Michael C. Neus

Winston Partners II LDC
c/o Curacao Corporation
Company, N.V.
Kaya Flamboyan 9
Willemstad, Curacao
Netherlands Antilles

                                      B-1
<PAGE>   27

Facsimile No.: 011-599-9-322-001

With a copy to:

The Chatterjee Group
888 Seventh Avenue
New York, New York 10106
Attention: Thomas Neustaetter/Peter Hurwitz
Facsimile No.: (212) 489-2005

Winston Partners II LLC
c/o Chatterjee Advisors L.L.C.
c/o The Chatterjee Group
888 Seventh Avenue
New York, New York 10106
Attention: Thomas Neustaetter/Peter Hurwitz
Facsimile No.: (212) 489-2005

Wind Point Partners III, L.P.
676 N. Michigan Avenue
Suite 3300
Chicago, Ill 60611
Attn: James Tenebrook
Fax No.: (312) 649-9644

Boston Capital Ventures III, L.P.
45 School Street
Boston, Ma 02108
Attn: Johan von der Goltz
Fax No.: (617) 227-3847

Farley, Inc.
Fruit of the Loom, Inc.
Senior Executive Officer
Deferred Compensation Trust
William Farley
Farley Group
c/o Fruit of the Loom
233 South Wacker Drive
5000 Sears Tower
Chicago, Ill 60606
Attn: David Vogel
Fax No.: (312) 993 1749

                                      B-2
<PAGE>   28

Mr. Robert W. Humes
17137 Yearlings Lane
Wadsworth, Ill 60083
Fax No.: (847) 855-0336

Westbury Capital Partners, L.P.
400 Post Avenue
Westbury, NY 11590

Jeffrey H. Freed
64 Short Way
Roslyn Heights, NY  11577

Brett D. Rome
Palm Beach Gardens, FL  33918


                                      B-3

<PAGE>   1


                                  EXHIBIT 5.1


                                January  , 1998


MGC Communications, Inc.
3301 N. Buffalo Drive
Las Vegas, Nevada  89129

         Re:      Registration Statement on Form S-4, File No. 333-38875

Ladies and Gentlemen:

We have acted as counsel for MGC Communications, Inc., a Nevada corporation (the
"Company"), in connection with the preparation and filing of a registration
statement on Form S-4, File No. 333-38875 (the "Registration Statement"), with
the Securities and Exchange Commission under the Securities Act of 1933, as
amended. The Registration Statement relates to the exchange of up to an
aggregate principal amount of $160,000,000 of the Company's 13% Series B Senior
Secured Notes Due 2004 (the "Exchange Notes") for up to an aggregate principal
amount of $160,000,000 of its outstanding 13% Senior Secured Notes Due 2004.
Capitalized terms used but not defined herein shall have the meanings as set
forth in the Registration Statement.

This letter is governed by, and shall be interpreted in accordance with, the
Legal Opinion Accord (the "Accord") of the American Bar Association Section of
Business Law (1991). As a consequence, it is subject to a number of
qualifications, exceptions, definitions, limitations on coverage and other
limitations, all as more particularly described in the Accord, and this letter
should be read in conjunction with the Accord. Notwithstanding anything in the
Accord to the contrary, the Accord shall not be deemed to limit or otherwise
qualify any of the express qualifications, exceptions and limitations that are
set forth herein, each of which shall be cumulative of the Accord.

In connection with this opinion, we have relied as to matters of fact, without
investigation, upon certificates of public officials and others and upon
affidavits, certificates and written statements of directors, officers and
employees of, and the accountants for, the Company. We have also examined
originals or copies, certified or otherwise identified to our satisfaction, of
such instruments, documents and records as we have deemed relevant and necessary
to examine for the purpose of this opinion, including (a) the Registration
Statement, (b) the Articles of Incorporation of the Company, (c) the By-laws of
the Company, (d) the minutes of meetings of the Board of Directors of the
Company, (e) the Indenture for the Notes, and (f) the Form of Exchange Note.

In connection with this opinion, we have assumed the accuracy and completeness
of all documents and records that we have reviewed, the genuineness of all
signatures, the due authority of the parties signing such documents, the
authenticity of the documents submitted to us as originals and the conformity to
authentic original documents of all documents submitted to us as certified,
conformed or reproduced copies. We have further assumed that:

         (i)      All natural persons involved in the transactions contemplated
                  by the Registration Statement (the "Offering") and the
                  Indenture have sufficient legal capacity to enter into and
                  perform their respective obligations under the Indenture and
                  to carry out their roles in the Offering.


<PAGE>   2


MGC Communications, Inc.
January  , 1998
Page 2

         (ii)     Each party involved in the Offering other than the Company
                  (collectively the "Other Parties") has satisfied all legal
                  requirements that are applicable to it to the extent necessary
                  to make the Indenture enforceable against it.

         (iii)    Each of the Other Parties has complied with all legal
                  requirements pertaining to its status as such related to its
                  rights to enforce the Indenture against the Company.

The opinions set forth below are limited to the laws of the State of Georgia,
the general corporate laws of the State of Nevada and the federal laws of the
United States of America. We are not members of the state bar of New York, and
we are not experts on the laws of such state.

Further, we note that the Exchange Notes provide that they are to be governed by
the laws of the State of New York. For purposes of this letter, we have assumed
with your consent that, notwithstanding their express terms, the Exchange Notes
will be governed by the laws of the State of Georgia (without giving effect to
its conflicts of laws principles). We express no opinion on what laws will
actually govern the Exchange Notes.

Based upon and subject to the foregoing, it is our opinion that:

         (1) The Company is a corporation duly incorporated and existing under
the laws of the State of Nevada.

         (2) The Exchange Notes covered by the Registration Statement, when
executed in the manner set forth in the Indenture and issued and delivered in
the manner set forth in the Registration Statement, will be legally issued, will
be binding obligations of, and will be enforceable against the Company.

         The General Qualifications apply to the opinions set forth above.

         We hereby consent to the reference to our name in the Registration
Statement under the caption "Legal Matters" and further consent to the filing of
this opinion as Exhibit 5 to the Registration Statement.

                                 Very truly yours,

                                 ELLIS, FUNK, GOLDBERG, LABOVITZ
                                 & DOKSON, P.C.


                                 By:
                                    ----------------------------------------
                                    Robert B. Goldberg



<PAGE>   1


                                  EXHIBIT 8.1


                                January 7, 1998


MGC Communications, Inc.
3301 N. Buffalo Drive
Las Vegas, Nevada  89129

Ladies and Gentlemen:

We have acted as counsel for MGC Communications, Inc., a Nevada corporation (the
"Company"), in connection with the offer by the Company to exchange (the
"Exchange Offer") its 13% Series B Senior Secured Notes Due 2001 (the "Exchange
Notes"), for all outstanding 13% Senior Secured Notes Due 2001 (the "Outstanding
Notes"). This letter will confirm that we have advised the Company with respect
to certain United States federal income tax consequences of the Exchange Offer,
as described in the discussion set forth under the caption "United States
Federal Income Tax Consequences of the Exchange of Notes" in the Prospectus
included in the Registration Statement on Form S-4 (the "Registration
Statement"), filed on this date with the Securities and Exchange Commission (the
"SEC") under the Securities Act of 1933, as amended (the "Act"). Unless
otherwise defined, capitalized terms used herein shall have the respective
meanings ascribed to them in the Registration Statement.

We have based our opinions set forth in this letter on the provisions of the
Internal Revenue Code of 1986, as presently amended (the "Code"), existing
Treasury regulations thereunder (the "Regulations"), published rulings and
practices of the Internal Revenue Service (the "Service") and court decisions.
It should be noted that the federal income tax consequences discussed in this
letter might be modified by legislative, judicial or administrative action at
any time, and such action might be applied retroactively or otherwise in a
manner that might alter such tax consequences.

Based on the assumptions and subject to the qualifications and limitations set
forth therein, (i) we adopt the discussion set forth under the caption "United
States Federal Income Tax Consequences of the Exchange of Notes" in the
Registration Statement as our opinion with respect to the material United States
federal income tax consequences of the Exchange Offer, and (ii) in our opinion
such discussion accurately describes the material United States federal income
tax consequences of the exchange of the Notes. Such discussion is limited to the
material United States federal income tax consequences discussed therein, and it
does not purport to discuss all possible federal income tax consequences or any
state, local or foreign tax consequences, of the exchange of the Notes.

Except as stated above, we express no opinion with respect to any other matter.
We are furnishing this opinion to you solely in connection with the Exchange
Offer, and this opinion is not to be relied upon, circulated, quoted, or
otherwise referred to for any other purpose.


<PAGE>   2


MGC Communications, Inc.
January 7, 1998
Page 2

We hereby consent to the filing of this opinion letter as an exhibit to the
Registration Statement, to the use of our name in the Registration Statement and
to the reference to us and this opinion letter in the Registration Statement. By
giving such consent, we do not thereby admit that we are "experts" with respect
to this letter, as that term is used in the Act, or the rules and regulations of
the SEC thereunder.

                                    Very truly yours,

                                    ELLIS, FUNK, GOLDBERG, LABOVITZ
                                    & DOKSON, P.C.


                                    By: /s/ Robert B. Goldberg
                                       ----------------------------------------
                                       Robert B. Goldberg




<PAGE>   1
                                  EXHIBIT 10.1


     Confidential treatment has been requested with respect to certain
provisions of this Exhibit, which provisions have been omitted from this
Exhibit 10.1, marked by asterisks (***) and filed separately with the
Commission.

<PAGE>   2
                                                           Contract No. MGC9701N
                                                                          Page 1

                                                                    EXHIBIT 10.1

                      NETWORK PRODUCTS PURCHASE AGREEMENT

Northern Telecom Inc., a Delaware corporation having offices at 5555 Windward
Parkway, Suite B, Alpharetta, Georgia 30201-3895 ("Nortel") and MGC
Communications, Inc., a Nevada corporation, having its principal offices and
place of business at 3165 Palms Centre Drive, Las Vegas, Nevada 89103 ("Buyer")
agree as follows:

1.       SCOPE

         1.1     Certain terms used in this Agreement shall be defined as set
                 forth in Exhibit A.

         1.2     The terms and conditions of this Agreement shall apply to the
                 purchase by Buyer and the sale by Nortel of Equipment and
                 Services and the licensing of Software furnished in connection
                 with such Equipment.  The terms and conditions contained in a
                 Product Attachment shall modify and/or supplement the other
                 terms and conditions of this Agreement, only with respect to
                 the Product Line and Services described in the Product
                 Attachment.

         1.3     All Products and Services obtained by Buyer pursuant to this
                 Agreement shall be obtained by Buyer solely for initial use by
                 Buyer in its internal business to provide services available
                 through its networks, and not as stock in trade or inventory
                 which is intended for resale by Buyer to any third party as
                 new and unused material. All such Products shall be installed
                 in the United States.

2.       TERM

         2.1     This Agreement shall be in effect during the period that any
                 Product Attachment is in effect.  Each Product Attachment
                 shall be in effect during its Product Attachment Term.  This
                 Agreement or any part thereof may be terminated in accordance
                 with the express provisions of this Agreement concerning
                 termination or by written agreement of the parties.

         2.2     The termination of this Agreement or any part thereof shall
                 not affect the obligations of either party thereunder which
                 have not been fully performed with respect to any accepted
                 Order, unless such Order is expressly terminated in accordance
                 with this Agreement or by written agreement of the parties.
<PAGE>   3

                                                           Contract No. MGC9701N
                                                                          Page 2




3.       ORDERING

         All purchases pursuant to this Agreement shall be made by means of
         Orders issued from time to time by Buyer and accepted by Nortel in
         writing within fifteen (15) days.  Nortel will not reject an Order
         without advising Buyer of the deficiency in the Order and providing
         Buyer with a reasonable time to cure such deficiency.  Any Order not
         accepted in writing by Nortel within fifteen (15) days or any
         deficient Order not cured by Buyer within a reasonable time shall be
         deemed to be void.  All Orders shall reference this Agreement and the
         applicable Product Attachment and shall be governed solely by the
         terms and conditions set forth herein as modified and/or supplemented
         pursuant to Section 1.2 by the terms and conditions of any applicable
         Product Attachments.

4.       PRICES

         4.1     The prices, charges, and fees applicable to Orders shall be
                 set forth in the appropriate Product Attachments and may be
                 revised in accordance with the provisions stated therein.
                 Buyer shall pay transportation charges, including insurance,
                 in accordance with the applicable Product Attachment.

         4.2     Until the total of all prices, charges and fees for Products
                 and related Services furnished hereunder shall have been paid
                 to Nortel, Buyer shall cooperate with Nortel in perfecting
                 Nortel's purchase money security interest in such Products and
                 Buyer shall promptly execute all documents and take all
                 actions required by Nortel in connection therewith.  Buyer
                 shall not sell, lease or otherwise transfer such Products or
                 any portion thereof or allow any liens or encumbrances to
                 attach to such Products or any portion thereof prior to
                 payment in full to Nortel of the total of all such prices,
                 charges, and fees.

5.       TERMS OF PAYMENT

         5.1     The amounts payable for Products and/or Services may be
                 invoiced by Nortel to Buyer in accordance with the applicable
                 Product Attachments. All amounts payable and properly invoiced
                 pursuant to this Agreement shall be paid by Buyer to Nortel
                 within thirty (30) days from the date of Nortel's invoice in
                 accordance with the payment instructions contained in such
                 invoice.

         5.2     Overdue payments, excluding those which are the subject of a
                 good faith dispute, shall be subject to interest charges,
                 calculated daily commencing on the 31st day after the date of
                 the invoice, at one and one half percent (1-1/2%) per month or
                 such lesser rate as may be the maximum permissible rate under
                 applicable law.
<PAGE>   4

                                                           Contract No. MGC9701N
                                                                          Page 3




6.       TAXES

         Buyer shall at Nortel's direction promptly reimburse Nortel or pay
         directly to the applicable government or taxing authority all taxes
         and charges arising hereunder, including, without limitation,
         penalties and interest, except for taxes computed upon the net income
         of Nortel.  Buyer's obligations pursuant to this Section 6 shall
         survive any termination of this Agreement.

7.       RISK OF LOSS, TITLE

         7.1     Risk of loss or damage to Products shall pass to Buyer upon
                 delivery to the loading dock at the installation site or other
                 delivery location specified by Buyer in its Order, and Buyer
                 shall keep such Products fully insured for the total amount
                 then due Nortel for such Products.

         7.2     Good title to Equipment furnished pursuant to each Order
                 issued hereunder which shall be free and clear of all liens
                 and encumbrances shall vest in Buyer upon full payment by
                 Buyer of the total prices, charges and fees payable by Buyer
                 for such Equipment and any related Software or Services
                 furnished by Nortel in connection with such Equipment.

         7.3     Buyer shall receive a license to use Software subject to the
                 terms set forth in Exhibit B.

8.       TESTING, TURNOVER AND ACCEPTANCE

         8.1     If Nortel installs any Products furnished hereunder, the
                 rights and obligations of the parties with respect to testing,
                 turnover and acceptance of such Products shall be as set forth
                 in the applicable Product Attachment.

         8.2     If Nortel is not required by the terms of a Product Attachment
                 to install Products furnished hereunder, Nortel shall prior to
                 delivery of the Products perform such factory tests as Nortel
                 determines to be appropriate in order to confirm that such
                 Products shall be in accordance with the applicable
                 Specifications.  Buyer shall be deemed to have accepted the
                 Products upon completion of such tests.

         8.3     In the event that Buyer places Products into
                 revenue-generating service, such Products shall be deemed to
                 have been accepted by Buyer without limitation or restriction.
                 Notwithstanding the foregoing, Buyer may place the Products
                 into revenue-generating service for purposes of testing the
                 Product without being deemed to have accepted such Products
                 provided such testing does not continue for more than one (1)
                 day.
<PAGE>   5

                                                           Contract No. MGC9701N
                                                                          Page 4



9.       DISCLAIMERS OF WARRANTIES AND REMEDIES

         THE WARRANTIES AND REMEDIES SET FORTH IN EXHIBIT D AND IN ANY PRODUCT
         ATTACHMENT CONSTITUTE THE ONLY WARRANTIES OF NORTEL WITH RESPECT TO
         THE PRODUCTS AND SERVICES AND BUYER'S EXCLUSIVE REMEDIES IN THE EVENT
         SUCH WARRANTIES ARE BREACHED.  THEY ARE IN LIEU OF ALL OTHER
         WARRANTIES, WRITTEN OR ORAL, STATUTORY, EXPRESS OR IMPLIED, INCLUDING,
         WITHOUT LIMITATION ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
         PARTICULAR PURPOSE.  NORTEL SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR
         CONSEQUENTIAL DAMAGES OF ANY NATURE WHATSOEVER, BEFORE OR AFTER THE
         PLACING OF ANY PRODUCT INTO SERVICE.

10.      LIABILITY FOR BODILY INJURY, PROPERTY DAMAGE AND PATENT INFRINGEMENT

         10.1    A party hereto shall defend the other party against any suit,
                 claim, or proceeding brought against the other party for
                 direct damages due to bodily injuries (including death) or
                 damage to tangible property which allegedly result from the
                 negligence or willful misconduct of the defending party in the
                 performance of this Agreement. The defending party shall pay
                 all litigation costs, reasonable attorney's fees, settlement
                 payments and such direct damages awarded or resulting from any
                 such suit, claim or proceeding.

         10.2    Nortel shall defend and hold harmless Buyer against any suit,
                 claim or proceeding brought against Buyer alleging that any
                 Products, excluding Vendor Items, furnished hereunder infringe
                 any United States patent.  Nortel shall pay all litigation
                 costs, reasonable attorney's fees, settlement payments and any
                 damages awarded or resulting from any such suit, claim or
                 proceeding. With respect to Vendor Items, Nortel shall assign
                 any rights with respect to infringement of U.S. patents
                 granted to Nortel by the supplier of such Vendor Items to the
                 extent of Nortel's right to do so.

         10.3    The party entitled to defense pursuant to Section 10.1 or 10.2
                 shall promptly advise the party required to provide such
                 defense  of the applicable suit, claim, or proceeding and
                 shall cooperate with such party in the defense or settlement
                 thereof.  The party required to provide such defense shall
                 have sole control of the defense of the applicable suit,
                 claim, or proceeding and of all negotiations for its
                 settlement or compromise.

         10.4    If an injunction is obtained against Buyer's use of any
                 Products as a result of any suit, claim, or proceeding
                 described in Section 10.2, Nortel shall at Nortel's option and
                 at Nortel's expense use its reasonable efforts to either:
<PAGE>   6

                                                           Contract No. MGC9701N
                                                                          Page 5




                 10.4.1   procure for Buyer the right to continue using the
                          portions of the Products enjoined from use; or

                 10.4.2   replace or modify the same with equivalent or better
                          Products so that Buyer's use is not subject to any
                          such injunction.

         10.5    If Nortel cannot perform under Section 10.4.1 or 10.4.2, Buyer
                 shall have the right to return the infringing Products to
                 Nortel upon written notice to Nortel, and in the event of such
                 return, neither party shall have any further liabilities or
                 obligations under this Agreement on account of such
                 infringement or return, except Nortel shall refund, (a) the
                 price paid by Buyer for the Products if Buyer exercises its
                 right to return the Products during the two (2) year period
                 following the start of the Warranty Period of the Products, or
                 (b) the depreciated value of such Products carried on Buyer's
                 books at the time of such return, less any outstanding monies
                 due Nortel hereunder if Buyer exercises its right to return
                 such Products after such two (2) year period.

         10.6    The obligations of Nortel hereunder with respect to any suit,
                 claim, or proceeding described in Section 10.2 shall not apply
                 with respect to Products which are (a) manufactured or
                 supplied by Nortel in accordance with any design or any
                 special instruction furnished by Buyer, (b) used by Buyer in a
                 manner or for a purpose not contemplated by this Agreement,
                 (c) located by Buyer outside the United States, or (d) used by
                 Buyer in combination with other products not provided by
                 Nortel, including, without limitation, any software developed
                 solely by Buyer through the permitted use of Products
                 furnished hereunder, provided the infringement arises from
                 such combination or the use thereof. Buyer shall indemnify and
                 hold Nortel harmless against any loss, cost, expense, damage,
                 settlement or other liability, including, but not limited to,
                 attorneys' fees, which may be incurred by Nortel with respect
                 to any suit, claim, or proceeding described in this Section
                 10.6.

         10.7    Notwithstanding the above, Nortel shall have no obligation or
                 liability with regard to any patent infringement suit, claim,
                 or proceeding that may be made or brought against Buyer (i)
                 alleging that method of use claims in such patent are
                 infringed by any service offering and/or by any use by Buyer
                 of Products furnished hereunder to make such service offering
                 available or (ii) resulting in a settlement payment, or award
                 of damages, or accounting of profits, where such settlement,
                 award, or accounting is based on the revenues or profits
                 earned or other value obtained by Buyer from its use of such
                 Products and/or is based on the lost revenues or profits of
                 third parties arising from Buyer's use of such Products.

         10.8    If Nortel determines that any Products are or may become the
                 subject of a suit, claim, or proceeding as described in
                 Section 10.7, Nortel may provide
<PAGE>   7

                                                           Contract No. MGC9701N
                                                                          Page 6



                 Buyer with notice to that effect.  Nortel shall have no
                 liability to Buyer pursuant to Section 10.2, 10.4, or 10.5
                 with respect to Buyer's use of such Products which occurs
                 after the thirtieth (30th) day following the date of such
                 notice. In addition to its obligations pursuant to Section
                 10.3, if Buyer becomes aware that any Products may become the
                 subject of any such suit, claim, or proceeding before
                 receiving any such notice from Nortel, Buyer shall provide
                 Nortel with notice to that effect.

         10.9    After receipt of notice from Nortel pursuant to Section 10.8,
                 Buyer shall have the option to return to Nortel the applicable
                 Products identified in such notice and Nortel shall refund,
                 (a) the price paid by Buyer for the Products if Buyer
                 exercises its right to return the Products during the two (2)
                 year period following the start of the Warranty Period of the
                 Products, or (b) the depreciated value (as carried on the
                 books of Buyer) of the returned Products to Buyer as more
                 fully set forth in Section 10.5 if such return occurs after
                 the two (2) year period.

         10.10   The provisions of Sections 10.2 through 10.9 state the entire
                 liability of Nortel and its suppliers and the exclusive remedy
                 of Buyer with respect to any suits, claims, or proceedings of
                 the nature described in Section 10.2.

         10.11   Each party's respective obligations pursuant to this Section
                 shall survive any termination of this Agreement.

11.      REMEDIES AND LIMITATION OF LIABILITY

         11.1    Nortel shall have the right to suspend its performance by
                 written notice to Buyer and forthwith remove and take
                 possession of all Products that shall have been delivered to
                 Buyer, if, prior to payment to Nortel of any amounts due
                 pursuant to this Agreement with respect to such Products,
                 Buyer shall (a) become insolvent or bankrupt or cease, be
                 unable, or admit in writing its inability, to pay all debts as
                 they mature, or make a general assignment for the benefit of,
                 or enter into any arrangement with, creditors, (b) authorize,
                 apply for, or consent to the appointment of, a receiver,
                 trustee, or liquidator of all or a substantial part of its
                 assets or have proceedings seeking such appointment commenced
                 against it which are not terminated within ninety (90) days of
                 such commencement, or (c) file a voluntary petition under any
                 bankruptcy or insolvency law or under the reorganization or
                 arrangement provisions of the United States Bankruptcy Code or
                 any similar law of any jurisdiction or have proceedings under
                 any such law instituted against it which are not terminated
                 within ninety (90) days of such commencement.

         11.2    In the event of any material breach of this Agreement which
                 shall continue for thirty (30) or more days after written
                 notice of such breach (including a reasonably detailed
                 statement of the nature of such breach) shall have
<PAGE>   8

                                                           Contract No. MGC9701N
                                                                          Page 7



                 been given to the breaching party by the aggrieved party, the
                 aggrieved party shall be entitled at its option to avail
                 itself of any and all remedies available at law or equity,
                 except as otherwise provided in this Agreement.

         11.3    Nothing contained in Section 11.2 or elsewhere in this
                 Agreement shall make Nortel liable for any incidental,
                 indirect, consequential or special damages of any nature
                 whatsoever for any breach of this Agreement whether the claims
                 for such damages arise in tort, contract, or otherwise, or
                 shall increase the liability of Nortel under Section 9 or 10
                 or Exhibit D beyond that prescribed therein.

         11.4    Nortel shall not be liable for any additional costs, expenses,
                 losses or damages resulting from errors, acts or omissions of
                 Buyer, including, but not limited to, inaccuracy,
                 incompleteness or untimeliness in the provision of information
                 by Buyer to Nortel or fulfillment by Buyer of any of its
                 obligations under this Agreement.  Buyer shall pay Nortel the
                 amount of any such costs, expenses, losses or damage incurred
                 by Nortel.

         11.5    Any action for breach of this Agreement or to enforce any
                 right hereunder shall be commenced within four (4) years after
                 the cause of action accrues or it shall be deemed waived and
                 barred.

         11.6    The limitations on Nortel's liability and other obligations
                 set forth in Sections 9, 10, and 11 shall survive any
                 termination of this Agreement.

12.      FORCE MAJEURE

         If the performance by a party of any of its obligations under this
         Agreement shall be interfered with by reason of any circumstances
         beyond the reasonable control of that party, including without
         limitation, unavailability of supplies or sources of energy, power
         failure, breakdown of machinery, or labor difficulties, including
         without limitation, strikes, slowdowns, picketing or boycotts, then
         that party shall be excused from such performance for a period equal
         to the delay resulting from the applicable circumstances and such
         additional period as may be reasonably necessary to allow that party
         to resume its performance.  With respect to labor difficulties as
         described above, a party shall not be obligated to accede to any
         demands being made by employees or other personnel.

13.      CONFIDENTIAL INFORMATION

         13.1    Each party which receives the other party's Confidential
                 Information shall use reasonable care to hold such
                 Confidential Information in confidence and not disclose such
                 Confidential Information to anyone other than to its employees
                 and employees of its affiliates with a need to know. A party
                 that receives the other party's Confidential Information shall
                 not
<PAGE>   9

                                                           Contract No. MGC9701N
                                                                          Page 8



                 reproduce such Confidential Information, except to the extent
                 reasonably required for the performance of its obligations
                 pursuant to this Agreement and in connection with any
                 permitted use of such Confidential Information.

         13.2    Buyer shall take reasonable care to use Nortel's Confidential
                 Information only for study, operating, or maintenance purposes
                 in connection with Buyer's use of Products furnished by Nortel
                 pursuant to this Agreement.

         13.3    Nortel shall take reasonable care to use Buyer's Confidential
                 Information only to perform Nortel's obligations to provide
                 Products and/or Services to Buyer, provided Nortel may use any
                 of Buyer's Confidential Information for the development,
                 manufacture, marketing and maintenance of new products and/or
                 services and/or changes or modifications to the existing
                 Products and/or Services, which Nortel may, in either case,
                 provide to third parties without restriction.

         13.4    The obligations of either party pursuant to this Section 13
                 shall not extend to any Confidential Information which
                 recipient can demonstrate through written documentation was
                 already known to the recipient prior to its disclosure to the
                 recipient, was known or generally available to the public at
                 the time of disclosure to the recipient, becomes known or
                 generally available to the public (other than by act of the
                 recipient) subsequent to its disclosure to the recipient, is
                 disclosed or made available in writing to the recipient by a
                 third party having a bona fide right to do so, or is required
                 to be disclosed by process of law, provided that the recipient
                 shall notify the disclosing party promptly upon any request or
                 demand for such disclosure.

         13.5    The parties' obligations pursuant to this Section 13 shall
                 survive any termination of this Agreement.

14.      BUYER'S RESPONSIBILITIES

         14.1    All sites at which the Products shall be delivered or
                 installed shall be prepared by Buyer in accordance with
                 Nortel's standards, including, without limitation,
                 environmental requirements.

         14.2    Buyer shall provide Nortel-designated personnel access to the
                 Products during the times deemed necessary by Nortel to
                 install, maintain and service the Products in accordance with
                 Nortel's obligations.  Nortel personnel shall comply with
                 Buyer's reasonable site and security regulations, provided
                 Nortel receives written notice of any such regulations
                 reasonably in advance of the arrival of Nortel's personnel at
                 the site.
<PAGE>   10

                                                           Contract No. MGC9701N
                                                                          Page 9



         14.3    Buyer shall provide reasonable working space and facilities,
                 including heat, light, ventilation, telephones, electrical
                 current, trash removal and other necessary utilities for use
                 by Nortel-designated maintenance personnel, and adequate
                 secure storage space, if required by Nortel, for Products and
                 materials.  Buyer shall also provide adequate security for the
                 Products while on Buyer's site.

         14.4    Buyer shall obtain all necessary governmental permits
                 applicable to Buyer in connection with the installation,
                 operation, and maintenance of Products furnished hereunder,
                 excluding any applicable permits required in the normal course
                 of Nortel's doing business.

         14.5    Any information which Nortel reasonably requests from Buyer
                 and which is necessary for Nortel to properly install or
                 maintain the Products shall be provided by Buyer to Nortel in
                 a timely fashion and in a form reasonably specified by Nortel.

15.      HAZARDOUS MATERIALS

         15.1    Prior to issuing any Order for Services to be performed at
                 Buyer's facilities,  Buyer shall identify and notify Nortel in
                 writing of the existence of all Hazardous Materials which
                 Nortel may encounter during the performance of such Services,
                 including, without limitation, any Hazardous Materials
                 contained within any equipment to be removed by Nortel.

         15.2    If Buyer breaches its obligations pursuant to Section 15.1,
                 (a) Nortel may discontinue the performance of the appropriate
                 Services until all the applicable Hazardous Materials have
                 been removed or abated to Nortel's satisfaction by Buyer at
                 Buyer's sole expense, and (b) Buyer shall defend, indemnify
                 and hold Nortel harmless from any and all damages, claims,
                 losses, liabilities and expenses, including, without
                 limitation, attorneys' fees, which arise out of Buyer's breach
                 of such obligations. Buyer's obligations pursuant to this
                 Section 15.2 shall survive any termination of this Agreement.

16.      SUBCONTRACTING

         Nortel may subcontract any of its obligations under this Agreement,
         but no such subcontract shall relieve Nortel of primary responsibility
         for performance of its obligations.

17.      REGULATORY COMPLIANCE

         In the event of any change in the Specifications or Nortel's
         manufacturing or
<PAGE>   11

                                                           Contract No. MGC9701N
                                                                         Page 10



         delivery processes for any Products as a result of the imposition of
         requirements by any government, Nortel may upon notice to Buyer,
         increase its prices, charges and fees to cover the added costs and
         expenses directly and indirectly incurred by Nortel as a result of
         such change.

18.      GENERAL

         18.1    If any of the provisions of this Agreement shall be invalid or
                 unenforceable under applicable law and a party deems such
                 provisions to be material, that party may terminate this
                 Agreement upon notice to the other party. Otherwise, such
                 invalidity or unenforceability shall not invalidate or render
                 this Agreement unenforceable, but this Agreement shall be
                 construed as if not containing the particular invalid or
                 unenforceable provision and the rights and obligations of the
                 parties shall be construed and enforced accordingly.

         18.2    A party shall not release without the prior written approval
                 of the other party any advertising or other publicity relating
                 to this Agreement wherein such other party may reasonably be
                 identified. In addition each party shall take reasonable
                 precautions to keep the existence and the contents of this
                 Agreement confidential so long as this Agreement remains in
                 effect and for a period of three (3) years thereafter, except
                 as may be reasonably required to enforce this Agreement or by
                 law.

         18.3    The construction, interpretation and performance of this
                 Agreement shall be governed by the laws of the State of
                 Nevada, except for its rules with respect to the conflict of
                 laws.

         18.4    Neither party may assign or transfer this Agreement or any of
                 its rights hereunder without the prior written consent of the
                 other party, such consent not to be unreasonably withheld,
                 except Buyer's consent shall not be required for any
                 assignment or transfer by Nortel (a) to any Affiliate of all
                 or any part of this Agreement or of Nortel's rights hereunder,
                 or (b) to any third party of Nortel's right to receive any
                 monies which may become due to Nortel pursuant to this
                 Agreement.

         18.5    Notices and other communications shall be transmitted in
                 writing by certified United States Mail, postage prepaid,
                 return receipt requested, by guaranteed overnight delivery,
                 or by facsimile addressed to the parties as follows:

                 To Buyer:        MGC Communications, Inc.
                                  3165 Palms Centre Drive
                                  Las Vegas, Nevada 89103
                                  Attention:    Kent Heyman/Mike Burke
                                  Facsimile:    (702) 310-1111         
                                                    
<PAGE>   12

                                                           Contract No. MGC9701N
                                                                         Page 11




                 To Nortel:       Northern Telecom Inc.
                                  5555 Windward Parkway, Suite B
                                  Alpharetta, Georgia 30201-3895
                                  Attention: Vice President & General Manager, 
                                  Access Networks
                                  Facsimile:       (770) 661-5272

                 In addition, notices submitted by Buyer to Nortel specific to
                 any Product Attachment shall be delivered to the address
                 stated in the applicable Product Attachment along with a copy
                 submitted to Nortel at the address stated above.

                 Any notice or communication sent under this Agreement shall be
                 deemed given upon receipt, as evidenced by the United States
                 Postal Service return receipt Mail if given by certified
                 United States Mail, on the following business day if sent by
                 guaranteed overnight delivery, or on the transmission date if
                 given by facsimile during the receiving party's normal
                 business hours.

                 The address information listed for a party in this Section or
                 any Product Attachment may be changed from time to time by
                 that party by giving notice to the other as provided above.

         18.6    In the event of a conflict between the provisions of this
                 Agreement which are not contained in a Product Attachment and
                 the provisions of a Product Attachment, the provisions of the
                 Product Attachment shall prevail with respect to the Product
                 Line and Services described in that Product Attachment.

         18.7    All headings used herein are for index and reference purposes
                 only, and shall not be given any substantive effect.  This
                 Agreement has been created jointly by the parties, and no rule
                 of construction requiring interpretation against the drafter
                 of this Agreement shall apply in its interpretation.

         18.8    Buyer shall not export any technical data received from Nortel
                 pursuant to this Agreement, or release any such technical data
                 with the knowledge or intent that such technical data will be
                 exported or transmitted to any country or to foreign nationals
                 of any country, except in accordance with applicable U.S. law
                 concerning the exporting of such technical data. Buyer shall
                 obtain all authorizations from the U.S. government in
                 accordance with applicable law prior to exporting or
                 transmitting any such technical data as described above.

         18.9    Any changes to this Agreement may only be effected if agreed
                 upon in writing by duly authorized representatives of the
                 parties hereto.  No
<PAGE>   13

                                                           Contract No. MGC9701N
                                                                         Page 12



                 agency, partnership, joint venture, or other similar business
                 relationship shall be or is created by this Agreement.

         18.10   This Agreement, including all Product Attachments and Exhibits
                 constitutes the entire agreement of the parties with respect
                 to the subject matter hereof.

<TABLE>
<S>                                                   <C>
NORTHERN TELECOM INC.                                 MGC COMMUNICATIONS, INC.


By: /s/ Vickie Yohe                                   By: /s/ Nield J. Montgomery
   ------------------------------                        ------------------------------
             (Signature)                                              (Signature)

Name: Vickie Yohe                                     Name:  Nield J. Montgomery
     ---------------------------                           ---------------------------
             (Print)                                                  (Print)

Title: Group Vice President                           Title:  President/CEO
      -----------------------------                         -----------------------------

Date:  21 May 97                                      Date:   5/9/97
     -----------------------------                         -----------------------------
</TABLE>

NORTEL LAW DEPT.
/s/
- --------------------------
APPROVED AS TO FORM

April 29, 1997
- -------------------------
Date
<PAGE>   14

                                                           Contract No. MGC9701N
                                                                          Page 1



                                   EXHIBIT A

                                  DEFINITIONS

         As used in the Agreement (as defined below), the following initially
         capitalized terms shall have the following meanings:

         "Affiliate" shall mean Nortel's parent corporation, Northern Telecom
         Limited and any corporation controlled directly or indirectly by
         Northern Telecom Limited through the ownership or control of shares or
         other securities in such corporation.

         "Agreement" shall mean the Agreement to which this Exhibit is
         attached, and all Exhibits and Product Attachments.

         "Confidential Information" shall mean all information, including,
         without limitation, specifications, drawings, documentation, know-how
         and pricing information, of every kind or description which may be
         disclosed by either party or an Affiliate to the other party in
         connection with this Agreement, provided the disclosing party shall
         clearly mark any such information which is disclosed in writing as the
         confidential property of the disclosing party and the disclosing party
         shall identify the confidential nature of any such information which
         it orally discloses at the time of such disclosure and shall provide a
         written summary of the orally disclosed information to the recipient
         within fifteen (15) days of such disclosure.

         "Equipment" shall mean the hardware listed or otherwise identified in,
         or pursuant to, any Product Attachment.

         "Exhibits" shall mean Exhibits A, B, C, and D attached hereto, and any
         additional Exhibits which Nortel and Buyer subsequently agree in
         writing shall be incorporated into, and made a part of the Agreement
         by reference.

         "Hazardous Materials" shall mean any pollutants or dangerous, toxic or
         hazardous substances (including, without limitation, asbestos) as
         defined in, or pursuant to, the OSHA Hazard Communication Standard (29
         CFR Part 1910, Subpart Z), the Resource Conservation and Recovery Act
         of 1976 (42 USC Section 6901, et seq.), the Toxic Substances Control
         Act (15 USC Section 2601, et seq.), the Comprehensive Environmental
         Response Compensation and Liability Act (42 USC Section 9601, et
         seq.), and any other federal, state or local environmental law,
         ordinance, rule or regulation.

         "Order" shall mean a written purchase order issued by Buyer to Nortel.
         Each Order shall specify on the face of the Order the types and
         quantities of Products and/or Services to be furnished by Nortel
         pursuant to the Order, the applicable prices, charges and/or fees with
         respect to such Products and/or Services,
<PAGE>   15

                                                           Contract No. MGC9701N
                                                                          Page 2



         Buyer's facility to which the Products are to be delivered, the
         delivery and/or completion schedule, and any other information which
         may be required to be included in an Order in accordance with the
         provisions of this Agreement.

         "Product Attachments" shall mean any Product Attachments which the
         parties agree in writing shall be incorporated into, and made a part
         of, this Agreement.

         "Product Attachment Term" shall mean the period specified in a Product
         Attachment during which that Product Attachment shall be in effect.

         "Product Line" shall mean the Products described in and which may be
         furnished pursuant to a specific Product Attachment.

         "Products" shall mean any Equipment and/or Software which may be
         provided under this Agreement.

         "Services" shall mean all services listed or otherwise identified in,
         or pursuant to, any Product Attachment which may be purchased from or
         provided by Nortel and which are associated with the Product Line
         described in that Product Attachment.

         "Software" shall mean (a) programs in machine-readable code or
         firmware which (i) are owned by, or licensed to, Nortel or any of its
         Affiliates, (ii) reside in Equipment memories, tapes, disks or other
         media, and (iii) provide basic logic operating instructions and
         user-related application instructions, and (b) documentation
         associated with any such programs which may be furnished by Nortel to
         Buyer from time to time.

         "Specifications" shall mean, with respect to any Product Line, the
         specifications identified in the applicable Product Attachment,
         provided Nortel shall have the right at its sole discretion to modify,
         change or amend such specifications at any time.

         "Third Party Software Vendor" shall mean any supplier of programs
         contained in the Software which is not an Affiliate.

         "Vendor Items" shall mean, with respect to a Product Line, those
         portions of the Product which are identified in the applicable Product
         Attachment as Vendor Items.

         "Warranty Period" shall mean, with respect to a Product Line, the
         Warranty Period specified in the applicable Product Attachment.
<PAGE>   16

                                                           Contract No. MGC9701N
                                                                          Page 1



                                   EXHIBIT B

                                SOFTWARE LICENSE

         1.      Buyer acknowledges that the Software may contain programs
                 which have been supplied by, and are proprietary to, Third
                 Party Software Vendors. In addition to the terms and
                 conditions herein, Buyer shall abide by any additional terms
                 and conditions provided by Nortel to Buyer with respect to any
                 Software provided by any Third Party Software Vendor.

         2.      Upon Buyer's payment to Nortel of the applicable fees with
                 respect to any Software furnished to Buyer pursuant to this
                 Agreement, Buyer shall be granted a personal, non-exclusive,
                 paid-up license to use the version of the Software furnished
                 to Buyer only in conjunction with Buyer's use of the Equipment
                 with respect to which such Software was furnished for the life
                 of that Equipment as it may be repaired or modified. Buyer
                 shall be granted no title or ownership rights to the Software,
                 which rights shall remain in Nortel or its suppliers.

         3.      As a condition precedent to this license and to the supply of
                 Software by Nortel pursuant to the Agreement, Nortel requires
                 Buyer to give proper assurances to Nortel for the protection
                 of the Software.  Accordingly, all Software supplied by Nortel
                 under or in implementation of the Agreement shall be treated
                 by Buyer as the exclusive property, and as proprietary and a
                 TRADE SECRET, of Nortel and/or its suppliers, as appropriate,
                 and Buyer shall:  a) hold the Software, including, without
                 limitation, any methods or concepts utilized therein in
                 confidence for the benefit of Nortel and/or its suppliers, as
                 appropriate; b) not provide or make the Software available to
                 any person except to its employees on a 'need to know' basis;
                 c) not reproduce, copy, or modify the Software in whole or in
                 part except as authorized by Nortel; d) not attempt to
                 decompile, reverse engineer, disassemble, reverse translate,
                 or in any other manner decode the Software; e) issue adequate
                 instructions to all persons, and take all actions reasonably
                 necessary to satisfy Buyer's obligations under this license;
                 and f) forthwith return to Nortel, or with Nortel's consent
                 destroy, any magnetic tape, disc, semiconductor device or
                 other memory device or system and/or documentation or other
                 material, including, but not limited to all printed material
                 furnished by Nortel to Buyer which shall be replaced, modified
                 or updated.

         4.      The obligations of Buyer hereunder shall not extend to any
                 information or data relating to the Software which is now
                 available to the general public or becomes available by reason
                 of acts or failures to act not attributable to Buyer.

         5.      Buyer shall not assign this license or sublicense any rights
                 herein granted
<PAGE>   17

                                                           Contract No. MGC9701N
                                                                          Page 2



                 to any other party without Nortel's prior written consent,
                 such consent not to be unreasonably withheld.

         6.      Buyer shall indemnify and hold Nortel and its suppliers, as
                 appropriate, harmless from any loss or damage resulting from a
                 breach of this Exhibit B.  The obligations of Buyer under this
                 Exhibit B shall survive the termination of the Agreement and
                 shall continue if the Software is removed from service.
<PAGE>   18

                                                           Contract No. MGC9701N
                                                                          Page 1



                                   EXHIBIT C

                                    STORAGE


If Buyer notifies Nortel prior to the scheduled shipment date of Products that
Buyer does not wish to receive such Products on the date agreed by the parties,
or the installation site or other delivery location is not prepared in
sufficient time for Nortel to make delivery in accordance with such date, or
Buyer fails to take delivery of any portion of such Products, Nortel may place
the applicable Products in storage. In that event Buyer shall be liable for all
additional costs thereby incurred by Nortel.  Delivery by Nortel of any
Products to a storage location as provided above shall be deemed to constitute
delivery of the Products to Buyer for purposes of this Agreement, including,
without limitation, provisions for payment, invoicing, passage of risk of loss,
and commencement of the Warranty Period.
<PAGE>   19

                                                           Contract No. MGC9701N
                                                                          Page 1




                                   EXHIBIT D

                        LIMITED WARRANTIES AND REMEDIES

1.       Nortel warrants that the Equipment supplied hereunder will under
         normal use and service be free from defective material and faulty
         workmanship and will conform to the applicable Specifications for the
         Warranty Period specified in the Product Attachment with respect to
         such Equipment. The foregoing warranty shall not apply to items
         normally consumed in operation, such as, but not limited to, lamps and
         fuses or to Vendor Items.  Any installation Services performed by
         Nortel with respect to such Equipment shall be free from defects in
         workmanship for the Warranty Period set forth in the applicable
         Product Attachment.

2.       Nortel's sole obligation and Buyer's exclusive remedy under the
         warranty set forth in Section 1 above shall be limited to the
         replacement or repair, at Nortel's option and expense, of the
         defective Equipment, or correction of the defective installation
         Services.  Replacement Equipment may be new or reconditioned at
         Nortel's option.

3.       Nortel warrants that any Software licensed by Nortel to Buyer under
         this Agreement shall function during the Warranty Period of the
         Equipment with respect to which such Software is furnished without any
         material, service-affecting nonconformance to the applicable
         Specifications, provided that Buyer shall have paid all Software
         support fees specified in the applicable Product Attachment.  If the
         Software fails to so function, Buyer's sole remedy and Nortel's sole
         obligation under this warranty is for Nortel to correct such failure
         through, at Nortel's option, the replacement or modification of the
         Software or such other actions as Nortel reasonably determines to be
         appropriate.

4.       Unless otherwise stated in a Product Attachment, (a) Nortel's
         warranties in Section 3 above shall only apply to the portion of the
         Software actually developed by Nortel or its Affiliates, (b)  all
         other Software shall be provided by Nortel "AS IS", (c) Nortel shall
         assign to Buyer on a nonexclusive basis any warranty on such other
         Software provided to Nortel by the developer of such other Software to
         the extent of Nortel's legal right to do so.

5.       The obligations and remedies set forth in Sections 1, 2, and 3 above
         shall be conditional upon:  the Equipment not having been altered or
         repaired, the Software not having been modified, and the Products not
         having been installed outside the United States; any defect or
         nonconformance not being the result of mishandling, abuse, misuse,
         improper storage, improper performance of installation, other
         services, maintenance or operation by other than Nortel (including use
         in conjunction with any product which is incompatible with the
         applicable Equipment or Software or of inferior performance), and/or
         any error, act, or omission of Buyer described in Section 11.4; the
         Product not having been
<PAGE>   20

                                                           Contract No. MGC9701N
                                                                          Page 2




         damaged by fire, explosion, power failure, power surge, or other power
         irregularity, lightning, failure to comply with all applicable
         environmental requirements for the Products specified by Nortel or any
         other applicable supplier, such as but not limited to temperature or
         humidity ranges, or any act of God, nature or public enemy; and
         written notice of the defect having been given to Nortel within the
         applicable Warranty Period.

6.       The performance by Nortel of any of its obligations described in
         Section 2 or 3 of this Exhibit D shall not extend the applicable
         Warranty Period except to the extent specified in the applicable
         Product Attachment.

7.       Upon expiration of the applicable Warranty Period for Equipment
         furnished hereunder, repair and replacement Service for such Equipment
         shall be available to Buyer from Nortel in accordance with Nortel's
         then-current terms, conditions and prices.  Such repair and
         replacement Service and notice of any discontinuance of such repair
         and replacement Service shall be available for a minimum period set
         forth in the Product Attachment applicable to such Equipment.  This
         provision shall survive the expiration of this Agreement.

8.       Unless Nortel elects to repair or replace defective Equipment at
         Buyer's facility, all Equipment to be repaired or replaced, whether in
         or out of warranty, shall be packed by Buyer in accordance with
         Nortel's instructions stated in the applicable Product Attachment and
         shipped at Buyer's expense and risk of loss to a location designated
         by Nortel.  Replacement Equipment shall be returned to Buyer at
         Nortel's expense and risk of loss.  Buyer shall ship the defective
         Equipment to Nortel within thirty (30) days of receipt of the
         replacement Equipment.  In the event Nortel fails to receive such
         defective Equipment within such thirty (30) day period, Nortel shall
         invoice Buyer for the replacement Equipment at the then-current price
         in effect therefor.

9.       With respect to any Vendor Item furnished by Nortel to Buyer pursuant
         to this Agreement, Nortel shall assign to Buyer on a nonexclusive
         basis any warranty granted by the party that supplied such Vendor Item
         to Nortel to the extent of Nortel's right to do so.

10.      Neither Nortel nor Nortel's suppliers, as appropriate, shall have any
         responsibility for warranties offered by Buyer to any of its
         customers. Buyer shall indemnify Nortel and Nortel's suppliers, as
         appropriate, with respect thereto.

<PAGE>   21


                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 1




                               PRODUCT ATTACHMENT
                           CARRIER NETWORKS PRODUCTS

Northern Telecom Inc. ("Nortel") and MGC Communications, Inc. ("Buyer") agree
as follows:

1.       INCORPORATION BY REFERENCE

         This Product Attachment shall be incorporated into and made a part of
         Network Products Purchase Agreement No. MGC9701N between Nortel and
         Buyer.

2.       DEFINITIONS

         For purposes of this Product Attachment:

         "Acceptance Criteria" shall mean, with respect to any Products
         installed by Nortel hereunder, the standards and specifications
         contained in the Nortel Installation Manuals which are applicable to
         such Products.

         "Equipment" shall mean the equipment listed in Schedule A.

         "Extension" shall mean Equipment and/or Software which Nortel
         engineers and installs and which is added to an Initial System after
         the Turnover Date of the Initial System.

         "Initial System" shall mean the Equipment and Software which is
         included in any configuration identified in Schedule A as an "Initial
         System."

         "Installation Site" shall mean Buyer's facility identified in an Order
         to which the applicable Products identified in such Order shall be
         delivered or at which the applicable Services, if any, are to be
         performed, respectively.

         "Merchandise" shall mean any Equipment which is not part of a System
         and with respect to which no engineering or installation Services
         shall be provided by Nortel.

         "Product Attachment Term" shall mean the period which shall commence
         on the date this Product Attachment is executed by the latter of the
         parties and shall expire thirty six (36) months thereafter.

         "Services" shall mean the services described in Schedule B.

         "Software" shall mean the software listed in Schedule A. 
<PAGE>   22

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 2



         "Specifications" shall mean with respect to any Products furnished
         hereunder, the specifications published by Nortel which Nortel
         identifies as its standard performance specifications for such
         Products as of the date of Buyer's Order for such Products.

         "System" shall mean any Initial System or Extension.

         "Turnover Date" shall mean, with respect to any Products installed by
         Nortel hereunder, the date on which Nortel provides the Turnover
         Notice to Buyer pursuant to Section 8.a. of this Product Attachment.

         "Warranty Period" shall mean, with respect to:

         (a)     Any System, the period which shall commence upon the Turnover
                 Date with respect to such System and shall expire twelve (12)
                 months thereafter,

         (b)     Merchandise, the period which shall commence upon the date of
                 shipment with respect to such Merchandise by Nortel to Buyer
                 and shall expire ninety (90) days thereafter,

         (c)     Installation Services involving any System, the period which
                 shall commence upon the Turnover Date with respect to such
                 System and shall expire twelve (12) months thereafter,

         (d)     Equipment which is repaired or replaced pursuant to Nortel's
                 obligations under Exhibit D to the Agreement, the period
                 commencing five (5) days after (i) shipment of the replacement
                 Equipment to Buyer or (ii) completion of the repair at the
                 Installation Site of the applicable Equipment and which shall
                 expire on the later of thirty (30) days thereafter or the last
                 day of the original Warranty Period with respect to the
                 Equipment which was repaired or replaced, and

         (e)     Software which was corrected pursuant to Nortel's obligations
                 under Exhibit D to the Agreement, the period commencing upon
                 delivery of the corrected Software by Nortel to Buyer and
                 expiring on the later of thirty (30) days thereafter or the
                 last day of the original Warranty Period with respect to such
                 Software.

3.       SCOPE

         Buyer shall, no later than September 30, 1998, issue Orders for a
         minimum of fifteen (15) DMS-500 Initial Systems and a minimum of
         seventy five thousand (75,000) DMS-500/RSC Switching Lines described
         in the attached Schedule A, for delivery and installation scheduled to
         be completed no later than December 31,
<PAGE>   23

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 3



         1998, in Buyer's facilities.  The first three (3) DMS-500 Initial
         Systems shall be delivered to and installed in the Buyer's facilities
         located at Atlanta, Georgia; Chicago, Illinois; and Ontario,
         California, and the remaining seventeen (17) shall be delivered and
         installed in the Buyer's facilities to be designated by the Buyer.
         Buyer shall, no later than September 30, 1999, issue additional Orders
         for a minimum of five (5) DMS-500 Initial Systems and a minimum of
         twenty five thousand (25,000) DMS-500/RSC Switching Lines described in
         the attached Schedule A, for delivery and installation scheduled to be
         completed no later than December 31, 1999, in Buyer's facilities to be
         designated by Buyer.  Buyer shall pay the prices, fees and charges set
         forth in the attached Schedule A, Part I, Section 1.3, for all of the
         Initial Systems Ordered for installation and delivery, in accordance
         with Section 7 of this Product Attachment.

         Buyer may, during the Product Attachment Term, issue additional Orders
         for any miscellaneous circuit packs, as described in the attached
         Schedule A ("Miscellaneous Circuit Packs").  Buyer shall receive a 43%
         discount off the current list price on any Miscellaneous Circuit Pack
         Orders included with Buyer's Order for the DMS-500 Initial System, on
         which the Miscellaneous Circuit Packs will be installed, and for
         purposes of this Agreement, such described Miscellaneous Circuit Pack
         Orders shall be treated as part of the Initial System Order.  Buyer
         shall receive a 25% discount off the current list price on any Orders
         issued for Miscellaneous Circuit Packs at any other time during and
         prior to the expiration of the Product Attachment Term, and for
         purposes of this Agreement, such Orders shall be treated as an Order
         for Merchandise.

         Buyer may, during the Product Attachment Term, issue additional Orders
         for the Optional Power Plant Equipment described in the attached
         Schedule A, Part I, Section 1.4.  Buyer shall pay the prices, fees and
         charges set forth in the attached Schedule A, Part I, Section 1.4,
         for the Optional Power Plant Equipment in accordance with Section 7 of
         this Product Attachment.

         Buyer may, during the Product Attachment Term, issue additional Orders
         for the Extensions and RSC-S Remote System described in the attached
         Schedule A, Parts III and IV, respectively. Buyer shall pay the
         prices, fees and charges set forth in the attached Schedule A, Parts
         III and IV, respectively, for the Extensions and RSC-S Remote Systems
         in accordance with Section 7 of this Product Attachment.

4.       SCHEDULES

         The following Schedules which are attached hereto are an integral part
         of the Product Attachment and are incorporated herein by reference:

<TABLE>
                 <S>                          <C>
                 Schedule A                -  Products, Prices, and Fees
                 Schedule B                -  Services and Charges
                                                                  
</TABLE>
<PAGE>   24

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 4



<TABLE>
                 <S>                          <C>
                 Schedule C                -  Delivery
                 Schedule D                -  Documentation
                 Schedule E                -  Revolving Credit Note and Security Agreement
</TABLE>

5.       ORDERING

         With respect to Section 3, ORDERING of the Agreement the following
         additional terms shall apply:

a.       Buyer shall identify in each Order for Products whether the Products
         constitute an Initial System, Extension, or Merchandise. All Orders
         for Extensions, Merchandise, or any Services other than engineering
         and installation Services provided by Nortel in connection with an
         Order for an Initial System shall be subject to written agreement of
         Buyer and Nortel on the applicable prices, charges and fees with
         respect thereto as required pursuant to Section 6, PRICING, of this
         Product Attachment.

b.       Notwithstanding Exhibit C to the Agreement, Buyer may by written
         notice to Nortel cancel without charge any Order for Products and/or
         Services prior to the delivery date of the applicable Products set
         forth in such Order or the agreed date for the commencement by Nortel
         of the applicable Services ("Service Commencement Date"), except that
         if Buyer cancels such Order within six (6) weeks or less of any such
         date, a cancellation fee of fifteen percent (15%) of the aggregate
         price of all Products and/or Services included in such canceled Order
         shall be payable by Buyer. Nortel may invoice such amount upon receipt
         of Buyer's notice of cancellation of the Order.

c.       Notwithstanding Exhibit C to the Agreement, Buyer may by written
         notice to Nortel not less than six (6) weeks prior to the delivery
         date of any Products set forth in an Order and/or the Service
         Commencement Date of the applicable Services, delay the delivery date
         of such Products and/or the Service Commencement Date of such Services
         for a period which shall not exceed ninety (90) days from the date
         such Products were originally scheduled to be delivered or ninety (90)
         days from the Service Commencement Date, subject to the availability
         from Nortel of the applicable Products and/or Services after such
         period of delay.

d.       Except as set forth in Sections 5.b. and 5.c. of this Product
         Attachment, any change to an Order after Nortel's acceptance of such
         Order shall require written agreement of Nortel and Buyer upon a
         written change to the Order ("Change Order") which shall reference the
         original Order and be executed by the parties. No such changes shall
         be implemented until the applicable Change Order has been executed by
         the parties.
<PAGE>   25

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 5




e.       With respect to each Order for Products which is accepted by Nortel,
         Buyer may make a written request at least ninety (90) days prior to
         the scheduled shipment date of such Products for a change ("Change")
         consisting of certain addition(s) or deletion(s) to such Products.
         After receipt of such request, Nortel shall submit a Job Change Order
         ("JCO") to Buyer for Buyer's approval with respect to the requested
         Change, except that Nortel shall be under no obligation to submit such
         JCO to Buyer if Nortel determines that the Price applicable to such
         Order would be reduced by more than ten percent (10%) as a result of
         the implementation of the Change. Each JCO shall state whether the
         requested Change shall increase or decrease the Price and/or time
         required by Nortel for any aspect of its performance under the
         Agreement with respect to such Order. Buyer shall accept or reject the
         JCO in writing within ten (10) days of receipt thereof. Failure of the
         Buyer to accept or reject the JCO in writing as described above shall
         be deemed a rejection of the JCO by Buyer. In the event an accepted
         JCO involves the return to Nortel of any Equipment which shall have
         been previously delivered to Buyer, Nortel may invoice and Buyer shall
         pay the transportation costs and Nortel's then-current restocking
         charge for the returned Equipment.

f.       Any increase or decrease in the Price with respect to an Order
         hereunder which is occasioned by an accepted JCO shall be added to or
         subtracted from, as applicable, the amount of the last payment due
         pursuant to Section 6 with respect to such Order.

g.       If Buyer rejects a proposed JCO, then the rights and obligations of
         the parties with respect to the applicable Order shall not be subject
         to Buyer's requested Changes, provided that Buyer shall promptly pay
         to Nortel all of Nortel's additional costs and expenses incurred
         hereunder in accordance with Buyer's requested Changes and Nortel's
         additional costs and expenses subsequently incurred in order that
         Nortel may be able to perform Nortel's obligations without
         modification by the requested Changes, and Nortel shall be entitled to
         an extension of the dates for performance of its obligations with
         respect to the applicable Order as a result of any delays in such
         performance which result from the foregoing.

6.       PRICING

         With respect to Section 4, PRICES of the Agreement, the following
         additional terms shall apply:

a.       The prices set forth in Schedule A with respect to any Initial System
         shall be in effect for the Term of this Agreement.

b.       The prices for Equipment and the fees for the right to use the
         Software included in any Extension, prices for any Merchandise, and
         charges for any Services, other
<PAGE>   26

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 6



         than engineering and installation Services provided with any Initial
         System shall be as subsequently agreed in writing by Nortel and Buyer.

c.       All transportation charges associated with the shipment of the
         Products to Buyer for delivery are included in the prices, fees and
         charges as set forth in the attached Schedule A.

7.       TERMS OF PAYMENT

         With respect to Section 5, TERMS OF PAYMENT, the following additional
         terms shall apply:

         a.      With respect to the first ten (10) Initial Systems furnished
         hereunder by Nortel to Buyer, price listed in Schedule A shall be paid
         in accordance with the following:

         (1)     For good and valuable consideration, Buyer and Nortel hereby
         agree that Buyer may pay in installments a portion of the purchase
         price for the first ten (10) DMS-500 Initial Systems which Buyer shall
         issue Orders for installation and delivery under this Agreement during
         the initial twenty six (26) months of the Product Attachment Term
         ("Ten Systems").  The following terms and conditions shall apply:

                 a.       The maximum amount to be paid in installments for
                 each of the Ten Systems shall not exceed Four Hundred Thousand
                 ($400,000.00) Dollars ("Maximum Amount").

                 b.       The first DMS-500 Initial System for which the Buyer
                 shall issue Orders, pursuant to this Agreement, for delivery
                 and installation in the Buyer's facilities located in Atlanta,
                 Georgia ("Atlanta Switch"), shall be the model for the number
                 of host and remote switching lines ("Lines"), Ordered for and
                 installed in the Ten Systems.  In the event that Buyer issues
                 an Order for installation and delivery of any or all of the
                 Ten Systems with the same or greater number of Lines in
                 comparison to the Atlanta Switch, Buyer shall be limited to
                 the Maximum Amount for the total amount that Buyer may pay in
                 installment payments.  In the event that Buyer issues an Order
                 for installation and delivery of any or all of the Ten Systems
                 with a reduced number of Lines in comparison to the Atlanta
                 Switch, Nortel shall reduce the Maximum Amount for that
                 particular Initial System by Ten Dollars ($10.00) per line as
                 the Line size decreases ("Reduced Maximum Amount").  In
                 determining the Reduced Maximum Amount, Nortel shall subtract
                 the total number of Lines Ordered for the Initial System from
                 the total number of Lines of the Atlanta Switch, multiply the
                 resulting balance times Ten Dollars ($10.00), subtract the
<PAGE>   27

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 7



                 product from Four Hundred Thousand Dollars ($400,000.00) and
                 the resulting balance shall equal the Reduced Maximum Amount.

                 c.       Buyer shall pay, with regard to each of the Ten
                 Systems, the resulting balance of the Maximum Amount or
                 Reduced Maximum Amount for that Initial System subtracted
                 from the One Million Five Hundred Fifty Eight Thousand Dollar
                 ($1,558,000.00) purchase price for the DMS-500 Initial System
                 listed in Schedule A, Part I, Section 1.3, in accordance with
                 Section 7, Paragraph (a.), Subparagraph (2), of this Product
                 Attachment.

                 d.       For and in consideration of the purchase price for
                 the DMS-500 Initial System, Buyer shall receive a software
                 license, as described in the Exhibit B attached to the Network
                 Product Purchase Agreement, granting Buyer the right to use
                 the software installed in each DMS-500 Initial System
                 purchased under this Agreement.  With regard to the Ten
                 Systems, Buyer shall receive the same software license as
                 described in the Exhibit B attached to the Network Product
                 Purchase Agreement, with the following exceptions:

                          (i)     The Maximum Amount or the Reduced Maximum
                          Amount is equal to the right to use fee for the
                          software listed in the attached Schedule A, Part II,
                          Section 2.1 ("Special Software").

                          (ii)    The Buyer's software license for the Special
                          Software is contingent upon Buyer's successful
                          completion of all installment payments for each of
                          the Ten Systems.  Notwithstanding any of Nortel's
                          rights and remedies under this Agreement, in the
                          event that the Buyer does not successfully complete
                          all installment payments for any or all of the Ten
                          Systems, Nortel shall revoke Buyer's software license
                          for the Special Software and seek any or all other
                          remedies against Buyer that Nortel may be entitled to
                          under this Agreement, at law or in equity.

                 e.       Buyer shall, with respect to the payment of the
                 Maximum Amount and/or Reduced Maximum Amount for each of the
                 Ten Systems, execute a Security Agreement and Revolving
                 Credit Note, copies of which are attached hereto as Schedule
                 E, on or before the Turnover Date for the first of the Ten
                 Systems, in accordance with Section 8, hereinafter.

                 f.       Buyer shall provide Nortel with quarterly financial
                 statements within forty five (45) days of the end of each
                 quarter and with annual audited financial statements for
                 Buyer's fiscal year within sixty (60) days of the end of each
                 calendar year.  Buyer may pay off the balance due and
<PAGE>   28

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 8



                 owing to Nortel at any time prior to the completion of the
                 thirty (30) month term without penalty.

                 g.       Buyer has the option, during the Period, to issue
                 additional Orders for the DMS-500 Optional Software listed in
                 the attached Schedule A, Part II, Section 3.0 and to pay the
                 purchase price for the Software in installments, provided that
                 the Buyer has a credit balance with respect to the Maximum
                 Amount or Reduced Maximum Amount due and owing for that
                 particular Initial System of the Ten Systems.

         (2)       The remaining portion of the purchase price for the Ten
         Systems as calculated pursuant to Section 7, Paragraph a, Subparagraph
         (1) (c), hereinabove, shall be invoiced by Nortel in accordance with
         the following schedule:

                 a.       Twenty percent (20%) of such price may be invoiced
                 upon Nortel's acceptance of the Order for such Initial System,

                 b.       Fifty percent (50%) of such price may be invoiced on
                 the date of shipment by Nortel to Buyer of the switch
                 component of such Initial System,

                 c.       Twenty percent (20%) of such price may be invoiced on
                 the Turnover Date of such Initial System, and

                 d.       Ten percent (10%) of such price may be invoiced on
                 the date of Acceptance of such Initial System.

b.       With respect to the remaining Initial Systems, excluding the Ten
         Systems, furnished hereunder by Nortel to Buyer the price listed in
         Schedule A shall be invoiced by Nortel in accordance with the
         following schedule:

         (i)     Twenty percent (20%) of such price may be invoiced upon
                 Nortel's acceptance of the Order for such Initial System,

         (ii)    Fifty percent (50%) of such price may be invoiced on the date
                 of shipment by Nortel to Buyer of the switch component of such
                 Initial System,

         (iii)   Twenty percent (20%) of such price may be invoiced on the
                 Turnover Date of such Initial System, and

         (iv)    Ten percent (10%) of such price may be invoiced on the date of
                 Acceptance of such Initial System.

c.       With respect to each Extension furnished hereunder by Nortel to Buyer,
         the applicable price determined in accordance with Section 6.b. of
         this Product
<PAGE>   29

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                          Page 9



         Attachment shall be invoiced by Nortel in accordance with the
         following schedule:

         (i)     Twenty percent (20%) of such price may be invoiced upon
                 Nortel's acceptance of the Order for such Extension,

         (ii)    Fifty percent (50%) of such price may be invoiced on the date
                 of shipment by Nortel to Buyer of the Equipment included in
                 such Extension,

         (iii)   Twenty percent (20%) of such price may be invoiced on the
                 Turnover Date with respect to such Extension, and

         (iv)    Ten percent (10%) of such price may be invoiced on the date of
                 Acceptance of such Extension.

d.       Except as may be otherwise agreed in writing by the parties Nortel's
         prices for Merchandise and charges for any Services determined in
         accordance with Section 6.b. above may be respectively invoiced upon
         delivery of such Merchandise and upon performance of such Services by
         Nortel.


e.       The Debtor and the Secured Party hereby agree that the Secured Party
         shall have a first priority purchase money security interest in the
         collateral listed in the Security Agreement, Article II, attached
         hereto as Schedule E subject to the following terms and conditions:


         (i)     Secured Party shall have a first priority purchase money
                 security interest in each of the Ten Systems for the amount of
                 the purchase price to be paid by Debtor, as listed in the
                 Schedule A, Part I, attached hereto, less Four Hundred
                 Thousand ($400,000.00) Dollars (the "Initial Payment"); and


         (ii)    Upon the Debtor's complete payment of the Initial Payment for
                 any one or more of the Ten Systems, the Secured Party shall
                 subordinate its security interest in such of the Ten Systems
                 as to which such payments have been received in favor of a
                 third party lender; provided however, that such subordination
                 shall be limited such that the security interest in favor of a
                 third party lender to which the Secured Party's security
                 interest is subordinate cannot secure the indebtedness in
                 excess of the amount of the Initial Payment with respect to
                 that Initial System or eighty percent (80%) of the fair market
                 value of the Initial System, which ever is greater.

8.       TESTING, TURNOVER, AND ACCEPTANCE

         Pursuant to Section 8.1 of the Agreement, the rights and obligations
         of the parties with respect to testing, turnover and acceptance of any
         Products furnished hereunder and installed by Nortel shall be as
         follows:
<PAGE>   30

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                         Page 10



a.       Nortel shall provide Buyer with five (5) days written notice prior to
         commencing final commissioning and testing of any Products installed
         by Nortel. Buyer shall cause an authorized representative of Buyer to
         be present at the applicable Installation Site to witness such final
         commissioning and testing, provided that in the event such
         representative fails to be present for any reason, Nortel shall not be
         required to delay performance of such final commissioning and testing.
         In connection with the final commissioning and testing of such
         Products, Nortel shall test the Products for conformity with the
         applicable Acceptance Criteria. When such tests have been successfully
         completed, Nortel shall provide Buyer with written notice ("Turnover
         Notice") that the applicable Products meet such Acceptance Criteria
         and are ready for Buyer's testing for compliance with such Acceptance
         Criteria. Buyer shall promptly complete and return to Nortel Buyer's
         acknowledgment of receipt of such Turnover Notice.

b.       Following the Turnover Date, Buyer may test the applicable Products
         for compliance with the Acceptance Criteria using the tests and test
         procedures contained in Nortel's Installation Manuals with respect to
         such Products.  Within fifteen (15) days following the Turnover Date
         of the applicable Products, Buyer shall notify Nortel either that
         Buyer has accepted such Products in writing using Nortel's standard
         Acceptance Notice form or that Buyer has not accepted such Products in
         which case Buyer shall also provide Nortel with a written notice
         ("Notice of Deficiency") which shall provide in reasonable detail the
         manner in which Buyer asserts that the Products failed to meet the
         Acceptance Criteria. With respect to any such details with which
         Nortel agrees, Nortel shall promptly proceed to take appropriate
         corrective action and following correction, Buyer may retest the
         Products in accordance with this Section. Buyer shall accept the
         Products in writing without delay when the tests pursuant to this
         Section indicate that the Products comply with the Acceptance
         Criteria.

c.       With respect to any points of disagreement between Nortel and Buyer
         concerning any Notice of Deficiency which are not resolved by Nortel
         and Buyer within ten (10) days after the effective date of the Notice
         of Deficiency, Buyer, at its option, may waive any rights it may have
         on account of any such points of disagreement, or require that the
         disputed points be resolved by arbitration.

d.       Buyer shall notify Nortel in writing of its election pursuant to
         Section 8.c. not later than ten (10) days after the effective date of
         the Notice of Deficiency, if any, given to Nortel by Buyer. Upon
         expiration of such ten (10) day period unless Buyer has notified
         Nortel to the contrary, Buyer shall be deemed to have elected to waive
         its right with respect to any points of disagreement then existing
         between it and Nortel with respect to such Notice of Deficiency.

e.       If Buyer makes timely election to require arbitration of such disputed
         points, the arbitrator shall be chosen by mutual agreement. If the
         parties cannot agree upon
<PAGE>   31

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                         Page 11



         an arbitrator within three (3) days of Buyer's election to arbitrate,
         each party shall within three (3) days thereafter select an
         independent and an unaffiliated person to be an arbitrator. These two
         (2) persons selected shall select a third person, independent and
         unaffiliated with either party, as a third arbitrator. The arbitration
         shall be conducted in accordance with the Rules of the American
         Arbitration Association, provided, however that the Arbitrator(s)
         shall be empowered to reduce the Prices of Products only to the extent
         that the Arbitrator(s) find that the benefit of Buyer's bargain has
         been reduced. The Arbitrator(s) shall not have any authority to grant
         partial or total rescission unless the Arbitrator(s) determine that
         (i) Buyer has not substantially received the benefit of its bargain;
         and (ii) money damages will not provide an adequate remedy.  Judgment
         upon the award rendered by the Arbitrator(s) may be entered in any
         Court of competent jurisdiction.

f.       For purposes of this Product Attachment, "Acceptance" of the
         applicable Products shall occur upon the earliest of the following and
         Buyer shall upon request sign Nortel's Acceptance Notice confirming
         such Acceptance without any conditions, restrictions, or limitations
         of any nature whatsoever:

         (i)     The date on which Buyer accepts such Products pursuant to
                 Section 8.b. of this Product Attachment;

         (ii)    The failure of Buyer to provide Nortel with any notice
                 required by Section 8.b. of this Product Attachment, with
                 respect to such Products;

         (iii)   Use by Buyer of such Products or any portion thereof in
                 revenue-producing service at any time; or

         (iv)    Waiver by Buyer of its rights pursuant to Section 8.c. or 8.d.

g.       Acceptance by Buyer of such Products pursuant to Section 8.f. of this
         Product Attachment above shall not be withheld or postponed due to:

         (i)     Deficiencies of such Products resulting from causes not
                 attributable to Nortel, such as, but not limited to (A)
                 inaccuracy of information provided by Buyer, (B) inadequacy or
                 deficiencies of any materials, facilities or services provided
                 directly or indirectly by Buyer and tested in conjunction with
                 the applicable Products, (C) other conditions external to the
                 Products which are beyond the limits specified by Nortel in
                 the Specifications for the Products and which are used by
                 Nortel in performance calculations with respect to the
                 Acceptance Criteria, or (D) spurious outputs from adjacent
                 material; or
<PAGE>   32

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                         Page 12




         (ii)    Minor deficiencies or shortages with respect to such Products
                 which are attributable to Nortel, but of a nature that do not
                 prevent full and efficient operation of the Products.

h.       With respect to any deficiencies of the type described in Section
         8.g.(i), Nortel shall at Buyer's request and expense assist Buyer in
         the elimination or minimization of any such deficiencies. With respect
         to any deficiencies or shortages as described in the Section 8.g.(ii),
         Nortel shall, at Nortel's expense, take prompt and effective action to
         correct any such deficiencies or shortages.

i.       In the event Buyer's Acceptance of any Products is withheld or
         postponed due to any deficiencies of the type described in Section
         8.g.(i), Nortel shall invoice and Buyer shall pay Nortel's charges and
         reasonable expenses incurred by Nortel associated with Nortel's
         investigation of the reasons for Buyer's withholding or postponement
         of such Acceptance.

9.       WARRANTIES AND REMEDIES

         With respect to Exhibit D, LIMITED WARRANTIES AND REMEDIES, the
         following additional terms shall apply:

a.       Except as set forth in Section 9.b. below, Nortel shall in performance
         of its obligations under Section 2 of Exhibit D to the Agreement, (i)
         ship replacement Equipment or complete the repair within thirty (30)
         days of Nortel's receipt of the Equipment to be replaced or repaired,
         and (ii) commence the correction of the applicable installation
         Services within thirty (30) days of receipt of notice from Buyer
         pursuant to Section 5 of Exhibit D to the Agreement.

b.       For emergency warranty service situations involving the Equipment,
         Nortel shall during the applicable Warranty Period use all reasonable
         efforts to ship replacement Equipment within twenty-four (24) hours of
         notification of the applicable warranty defect by Buyer pursuant to
         Section 5 of Exhibit D to the Agreement, provided that Buyer shall
         have requested such emergency service. Nortel may invoice Buyer and
         Buyer shall pay Nortel's surcharge for emergency warranty services. If
         Nortel determines that due to the particular circumstances, onsite
         technical assistance is necessary, Nortel shall use all reasonable
         efforts to dispatch emergency service personnel to the applicable
         Installation Site within twenty-four (24) hours of receipt of notice
         from Buyer as described above.

c.       All Products to be repaired or replaced, both within and outside of
         the applicable Warranty Period, shall be packed by Buyer in accordance
         with Nortel's then-current instructions.

d.       No later than ninety (90) days prior to the expiration of the Warranty
         Period with respect to any Initial System, Nortel shall offer to Buyer
         post-warranty support
<PAGE>   33

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                         Page 13



         by means of an extended service plan or other terms, provided that
         neither party shall have any obligation with respect thereto except as
         may be agreed upon in writing by the parties.

10.      NOTICES

         Pursuant to Section 18.5 of the Agreement, any notices by Buyer to
         Nortel which are specific to this Product Attachment shall be
         delivered to the following address:

                                  Northern Telecom Inc.
                                  2350 Lakeside Blvd.
                                  Richardson, Texas  75082-4399
                                  Attn.:  Vice President and General Manager,
                                          Carrier Networks
                                  Facsimile (972) 685-8845

11.      ADDITIONAL TERMS

         The following additional terms shall apply to the Agreement:

(a)      With respect to Section 14, BUYER'S RESPONSIBILITIES, the following
         additional terms shall apply:

         (i)     Buyer shall be responsible for ordering and coordinating with
                 each applicable local telephone company the installation of
                 all central office trunks and test trunks and Buyer shall be
                 responsible for all utility charges associated with the
                 installation, testing, operation and maintenance of Products
                 furnished hereunder, including, but not limited to, all
                 applicable charges for such central office trunks, test trunks
                 and any tie lines.

(b)      Nortel shall provide documentation with respect to the Products in
         accordance with Schedule D to this Product Attachment.


<TABLE>
<S>                                                      <C>
NORTHERN TELECOM INC.                                    MGC COMMUNICATIONS, INC.


By: /s/ Vickie Yohe                                      By:  /s/ Nield J. Montgomery
   -----------------------------------------------------    ------------------------------------------
             (Signature)                                              (Signature)

Name: Vickie Yohe                                        Name:   Nield J. Montgomery
     ---------------------------------------------------      ----------------------------------------
             (Print)                                                  (Print)

Title:  Group Vice President                             Title:     President/CEO
      --------------------------------------------------       ---------------------------------------
</TABLE>

NORTEL LAW DEPT.
/s/
- ---------------------
APPROVED AS TO FORM

April 29, 1997
- --------------------
Date
<PAGE>   34

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                         Page 14



<TABLE>
<S>                                                      <C>
Date:  21 May 97                                         Date:   5/9/97
     ---------------------------------------------------      ----------------------------------------
</TABLE>
<PAGE>   35

                                                        MGC COMMUNICATIONS, INC.
                                                      CARRIER PRODUCT ATTACHMENT
                                                                      SCHEDULE A


                                   SCHEDULE A

                           PRODUCTS, PRICES AND FEES





                                        
<PAGE>   36

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                            I. DMS-500 INITIAL SYSTEM
                           (DMS-500 SWITCHING SYSTEM)



***



<PAGE>   37

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                            I. DMS-500 INITIAL SYSTEM
                           (DMS-500 SWITCHING SYSTEM)



***




<PAGE>   38

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



1.0      DMS-500 STANDARD SOFTWARE FEATURES


         1.1     Nortel may deliver Software ordered hereunder in a single
                 Software load which may include Software which Buyer has not
                 yet licensed ("Non-licensed Software").  Except as set forth
                 in Section 1.2 below, Buyer shall not be entitled to use such
                 Non-licensed Software, until such time as the applicable right
                 to use fees are paid by Buyer pursuant to Section 1.5.

         1.2     For the purpose of gathering market trial information and
                 prior to payment of any applicable right-to-use fees, certain
                 Non-licensed Software may be placed in service by Buyer on a
                 limited, non-revenue-generating, trial basis only ("Feature
                 Trial").  Buyer may request the right to evaluate such Non-
                 licensed Software for a maximum period of six (6) months
                 commencing as of the date of Nortel's written consent to such
                 Feature Trial.  Nortel shall respond to Buyer's request as
                 described above in writing.  Within ten (10) business days
                 following expiration of the agreed to Feature Trial period,
                 Buyer shall notify Nortel in writing of its plans for
                 activation or deactivation of such Non-licensed Software, and
                 the corresponding number of units activated, if applicable.

         1.3     Upon Buyer's placement of any Non-licensed Software in revenue
                 generating service, Buyer shall pay the applicable
                 right-to-use fees for such Non-licensed Software pursuant to
                 this Agreement, except as described in Section 1.2.  Buyer
                 shall also have the option to pay the applicable right-to-use
                 fees for any Non-licensed Software upon installation of a
                 Software load containing such Non-licensed Software.  For any
                 Non-licensed Software that is installed and added pursuant to
                 a product computing module load ("PCL") and or non-computing
                 module load ("NCL"), if any, the right-to-use fees shall be
                 the list price for such feature in effect as of the date of
                 activation.

         1.4     To ensure Buyer's proper activation and/or usage of the
                 appropriate Software, Buyer shall properly notify Nortel at
                 the address specified in Section 9 of this Product Attachment
                 to the attention of Director, Sales Engineering, prior to the
                 activation and/or usage by Buyer of any Software. Buyer shall
                 identify all Software being activated and/or used (including
                 the number of units activated, if applicable) in each Intial
                 System.

         1.5     Nortel shall promptly review notification from Buyer provided
                 pursuant to Section 1.4 above and identify any applicable
                 prerequisite Equipment or Software required by Buyer prior to
                 activation and/or usage of the applicable Software. Nortel
                 shall respond to Buyer's written notice by means of a price
                 quotation. Such price quotation shall include Nortel's consent
                 to activate and/or use such Software or notification that such
                 Software requires engineering to determine whether the current
                 switch configuration will require additional Equipment prior
                 to activation and/or usage.  Upon Buyer's written acceptance
                 of Nortel's price quotation, Nortel shall grant its consent to
                 Buyer to activate and/or use such Software prior to payment of
                 the applicable right-to-use fees.  However, under no
                 circumstances shall such Software be activated and/or used by
                 Buyer prior to Buyer's acceptance of Nortel's price quotation.
                 Nortel shall invoice Buyer for all applicable right to use
                 fees and associated feature activation engineering charges.
                 One hundred percent (100%) of such invoiced right to use fees
                 and engineering charges shall be due and payable within thirty
                 (30) days of the date of Nortel's invoice therefor.

         1.6     Notwithstanding the foregoing, Buyer shall not be required to
                 pay additional right to use fees associated with the Software
                 licensed prior to the initial date of this Product Attachment.





<PAGE>   39

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



         1.7     Nortel reserves the right, every six (6) months to submit a
                 written report for each site containing a Software load.  The
                 written report shall identify all Software activated and/or
                 used (including the number of incremental units activated, if
                 applicable) by Buyer during the applicable reporting period.
                 Buyer shall audit the report against Purchase Order(s) which
                 have been submitted by Buyer and accepted by Nortel during the
                 applicable period to determine the existence of any
                 discrepancies.  Buyer shall submit such audited written report
                 to Nortel at the address specified in Section 9 of this
                 Product Attachment to the attention of Director, Sales
                 Engineering, within thirty (30) days from receipt of such
                 request.

         1.8     Nortel also reserves the right to access by remote polling or
                 to conduct an on-site inspection of any site in which a
                 Software load is installed and/or to perform an on-site review
                 of Buyer's books and records related to such site to verify
                 activation and/or usage of Software.

         1.9     Nortel shall issue invoices, for any applicable prices,
                 charges or fees, in addition to those amounts previously
                 invoiced, as a result of Buyer's activation and/or usage of
                 any Software that does not appear on Nortel's written report
                 or that appear as a result of Nortel's remote polling of an
                 Initial Systems.

         1.10    Upon payment of the applicable right to use fees for Software
                 activated and/or used by Buyer, Buyer shall receive a
                 non-exclusive paid-up license to use such Software in
                 accordance with the provisions of this Agreement.  Nortel may
                 immediately terminate the applicable license granted hereunder
                 for Buyer's failure to pay the applicable right to use fees
                 for such Software which has been activated and/or used.


         1.11    The obligations of Buyer under this Section 1 shall without
                 limitation survive the termination of this Agreement and shall
                 continue if the Software is removed from service. Buyer agrees
                 to indemnify Nortel or Third Party Software Vendors as
                 appropriate for any loss or damage resulting from a breach of
                 this Section 1.





<PAGE>   40

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



2.0      LLT0B0005 SOFTWARE INCLUDED IN THE DMS-500 INITIAL SYSTEM NOT 
         ELIGIBLE FOR "DEFERRED BILLING."

         2.1     SOFTWARE INCLUDED IN INITIAL SYSTEM NOT ELIGIBLE FOR "DEFERRED
                 BILLING"

                 The following represents the LLT0B0005 Software packages that
                 are included in the price of the DMS-500 Initial System,
                 described in Schedule A, Part 1, Section 1.0. The following is
                 a list of Software only and does not include any/all required
                 Equipment to provide feature functionality.

<TABLE>
<CAPTION>
                  S/W PACKAGE         DESCRIPTION
                  -----------         -----------
                  <S>                 <C>
                   BAS00001           Base Cook
                   BAS00002           Base ANI
                   BAS00003           Base Generic
                   BAS00004           Base OA&M
                   BAS00007           Base Logs
                   BAS00020           Base Flexible Bellcore AMA
                   BAS00028           Base DPP
                   BASE0001           Local Base
                   BASE0006           Base SN SR60
                   LOC00001           Local Services
                   SS700001           SS7 Trunk Signalling
                   TEL00001           Telecom Layer
                   TEL00002           TEL CCS7 Channelized Access
                   TEL00008           CCS7 Base
                   UDD00001           UDD Services
                   BAS00012           BAS Remote
                   EQA00001           Equal Access Local
                   EQA00002           Equal Access Toll
                   EQA00003           Cellular - Interconnect End Office
                   EQA00005           Intermediate Tandem
                   EQA00006           EQA C7ISUPLRLTA Conn. EAEO
                   EQA00007           EQA EA Alt Sw Point
                   EQA00009           EQA IBN Intra LATA PIC EAEO
                   EQA00012           EQA C7ISUPLRLTA Conn. AT
                   NI000007           NI0 ISDN Base
                   NI000011           NI0 NI-1 PRI
                   NI000022           NI0 ISDN PRI Base
                   NTS00005           Equal Access 800
                   SMA00001           SMA TR303 I/F
</TABLE>


         2.2   CENTRAL OFFICE LIMITED USAGE FEATURES NOT ELIGIBLE FOR "DEFERRED
               BILLING."

               The Buyer has a Software license for the following Software
               features which may be utilized for the associated initial number
               of licenced units.  For each additional unit in excess of the
               initial number of units, refer to the S/W Optional Part II,
               Section 3.2 for incremental pricing and to





<PAGE>   41

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



               Section 3.1 for special incremental software package pricing.
               The following is a list of Software only and does not include
               any/all required Equipment to provide feature functionality.

<TABLE>
<CAPTION>
               S/W PACKAGE            DESCRIPTION                                    UNIT          INITIAL UNITS
               -----------            -----------                                    ----          -------------
                                                                                                    LICENCED
                                                                                                    --------
               <S>                    <C>                                        <C>               <C>
                  LEA00001            LEAS Toll 1st 50k Directory                Directory  #       50,000
</TABLE>


2.1      LLT0B0005 SOFTWARE INCLUDED IN THE DMS-500 INITIAL SYSTEM ELIGIBLE FOR
         "DEFERRED BILLING."

         2.1     SOFTWARE INCLUDED IN INITIAL SYSTEM ELIGIBLE FOR "DEFERRED 
                 BILLING"

                 The following represents the LLT0B0005 Software packages that
                 are included in the price of the DMS-500 Initial System,
                 described in Schedule A, Part 1, Section 1.0. The following is
                 a list of Software only and does not include any/all required
                 Equipment to provide feature functionality.

<TABLE>
<CAPTION>
                   S/W PACKAGE        DESCRIPTION
                   -----------        -----------
                  <S>                 <C>
                  MDC00003            MDC Standard
                  MDC00004            MDC CLASS on MDC
                  MDC00006            MDC MBG Standard
                  MDC00007            MBS Minimum
                  MDC00010            MDC CLASS on MDC/MPV II
                  MDC00033            MDC Name/Number Blocking
                  RES00006            RES Service Enablers
                  RES00021            RES Anonymous Caller Rejection
                  RES00022            RES Calling Name Delivery Blocking
                  RES00027            RES Visual Message Waiting
                  RES00030            RES Customer Originated Trace
</TABLE>


         2.2   CENTRAL OFFICE LIMITED USAGE FEATURES ELIGIBLE FOR "DEFERRED
               BILLING"

               The Buyer has a Software license for the following Software
               features which may be utilized for the associated initial number
               of licenced units.  For each additional unit in excess of the
               initial number of units, refer to the S/W Optional Part II,
               Section 3.2 for incremental pricing and to Section 3.1 for
               special incremental software package pricing. The following is a
               list of Software only and does not include any/all required
               Equipment to provide feature functionality.

<TABLE>
<CAPTION>
               S/W PACKAGE            DESCRIPTION                                    UNIT          INITIAL UNITS
               -----------            -----------                                    ----          -------------
                                                                                                    LICENCED
                                                                                                    --------
               <S>                    <C>                                        <C>                <C>
                  MDC00001            MDC Base                                   Featured Line      11,000
                  RES00003            RES Display Functionality /Privacy         Featured Line      100
                  RES00005            RES Non-Display Services                   Featured Line      100
                  RES00023            RES Calling Name Display SW                Featured Line      100
                  RES00025            RES Call Waiting Display                   Featured Line      5,000
</TABLE>





<PAGE>   42

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
                  <S>                 <C>                                        <C>                <C>
                  RES00032            RES Selective Call Forwarding              Featured Line      100
                  RES00033            RES Selective Call Rejection               Featured Line      100
                  RES00034            RES Distinctive Ringing/Call Wtg           Featured Line      100
                  RES00035            RES Selective Call Acceptance              Featured Line      100
                  RES00036            RES Auto-Recall Blck to Private No.        Featured Line      100
</TABLE>


3.0      LLT0B005 SOFTWARE OPTIONAL TO THE DMS-500 INITIAL SYSTEM

         3.1   CENTRAL OFFICE FEATURE ADDITIONS OVER LIMITED USAGE FEATURES

               The Buyer has a Software license for the following Software
               features which may be purchased at an incremental price, beyond
               the initial licenced units as indicated in Section 2.1.

<TABLE>
<CAPTION>
               S/W PACKAGE            DESCRIPTION                  UNIT           MIN.  UNIT           PRICE/
               -----------            -----------                  ----           ----------           ------
                                                                                  INCREMENTS           UNIT
                                                                                  ----------           ----
               <S>                    <C>                          <C>            <C>                 <C>
                  MDC00001            MDC Base                     Featured Line    100               $14.00
                  RES00023            RES Calling Name Disp        Featured Line    100               $30.00
                  RES00025            RES Call Waiting Disp        Featured Line    5,000             $3.00
                  RES00036            RES Auto-Recall Blck         Featured Line    1                 $1.00
</TABLE>


               The following six (6) Class* Software features have a right to
               use fee of twenty nine dollars ($29.00) per each Class* line in
               100 line increments, beyond the initial licenced units as
               indicated purchase on a individual basis then refer to the S/W
               Optional Part II, Section 3.2 for incremental pricing.

<TABLE>
                  <S>                 <C>
                  RES00003*           RES Display Functionality /Privacy
                  RES00005*           RES Non-Display Services
                  RES00032*           RES Selective Call Forwarding
                  RES00033*           RES Selective Call Rejection
                  RES00034*           RES Distinctive Ringing/Call Wtg
                  RES00035*           RES Selective Call Acceptance
</TABLE>


         3.2      LLT0B005 SOFTWARE OPTIONAL

         The following represents the LLT0B005 optional Software packages that
         are not included in the price of the DMS-500 Initial System as
         defined in Schedule A, Part I, Section 1.0 of this Product Attachment. 
         The following Software represents those feature packages that may be
         ordered by Buyer at an additional price for a DMS-500 Initial System
         and does not include any/all required Equipment to provide feature
         functionality.

<TABLE>
<CAPTION>
         PRODUCT NAME                      ORDER CODE               PRICE AND NOTES
         ------------                      ----------               ---------------
         <S>                               <C>                      <C>
         BASE SN SR70 Processor            BASE0009                 The upgrade if previously licensed
                                                                    from:  BASE0006 = $185,000
</TABLE>





<PAGE>   43

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
         ACD ACD Base                      ACD00001                 The fee is $500 per ACD line plus $5,000 per
                                                                    ACD user group.
         ACD MIS                           ACD00005                 The fee is $250 per ACD line.
         ACD Miscellaneous                 ACD00006                 $52,000
         ACD Compucall                     ACD00002                 The fee is $7,500 per switched virtual circuit.
         ACD Compucall-Func                ACD00007                 The fee is $42,000 per switched virtual circuit.
         ACD Ctrx Coord V&Dta              ACD00008                 The fee is $5,000 per 100 Centrex lines.
         ACD Networking                    ACD00004                 The fee is $25,000 for the first 100 Network
                                                                    ACD lines plus $500.00 per Network ACD line over the
                                                                    first 100.
         ACD Network ACD on PRI            ACD00010                 The fee is $400.00 per ACD line.
         ACD Network ACD on SS7            ACD00009                 The fee is $400.00 per ACD line.
         AIN Essentials                    AIN00002                 $700,000
         AIN  Default Routing              AIN00010                 $65,000
         AIN Call Management               AIN00006                 $200,000
         AIN Call Model Cntrl              AIN00007                 $190,000
         AIN Primer                        AIN00001                 The fee is $80,000 Net (not subject to any
                                                                    discounts) to be paid annually.
         AIN SSP Svcs Enhcemnts            AIN00011                 $40,000
         BAS ABBT LM-Cut Re-wrt            BAS00049                 $8,000
         BAS Enh Permanent Signal          BAS00041                 $40,000
         BAS MAP TELNET Access             BAS00021                 No Charge
         BAS SDM Table Access              BAS00022                 No Charge
         BAS RSC-S                         BAS00009                 The fee is $120,000 per module incremental.
         BAS Remotes Generic               BAS00012                 $700.00 per LCM/LCME in the Remote office +
                                                                    $5,500/Remote
         DTP Datapath                      DTP00001                 $17,500
         DTP DataCall Tester               DTP00003                 No Charge
         ENS E911                          ENS00005                 $15,000
         ENS ACD PSAP                      ENS00002                 The fee is $47,000 plus $2,000 per E911 position.
                                                                    The fee is $32,000 plus $2,000 per E911 position if
                                                                    ENS00001 has been previously licensed.
         ENS LDT PSAP                      ENS00001                 $125,000
         ENS Large SRDB                    ENS00004                 If more than 1 million records are required the
                                                                    fee is $195,000*.  If less than 1 million records
                                                                    are required the fee is $145,000*.
         EQA Local                         EQA00001                 $4,800 per LGC/LGCI, $4,800 per LTC/LTCI, and $1,600
                                                                    per LME.  The total fee shall not exceed $72,000 per
                                                                    office.
         EQA Toll                          EQA00002                 $1,200 per DCM and  $300.00 per TM.  The total shall
                                                                    not exceed $190,000 per office.
         EQA Celular Interconnect          EQA00004                 $25,000
         EQA Enh WATS O.[POTS              EQA00010                 $20,000
         EQA Equal Access OSS              EQA00011                 $8,000
         EQA POTS IraLATA PICeaeo          EQA00008                 $20,000
         EQA Intermediate Tandem           EQA00005                 $20,000
         ISUP Cellular                     ISUP0001                 $150,000
         LEA LEAS Local                    LEA00002                 $22,500
         LEA LEAS Toll                     LEA00001                 $20,000 for each additional Group of 10,000
                                                                    Directory numbers over the first 50,000.
</TABLE>





<PAGE>   44

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
         LEA SS7 I/W with LEAS             LEA00003                 $30,000
         LOC Carrier Parameter             LOC00002                 $20,000
         MDC - MDC Minimum                 MDC00001                 $1,750 per group of 100 MDC lines, not to exceed
                                                                    $404,000 per office.  The first 100 MDC lines are
                                                                    included in the base price.
         MDC - MDC MSAC                    MDC00002                 $21,733
         MDC Personal Call Screen          MDC00020                 $5,000
         MDC Teen Service                  MDC00035                 The fee is $5,000 per 100 MDC lines
         MDC MBG Min                       MDC00005                 $73,500
         MDC NETNAME Expand                MDC00025                 $2,000
         MDC MBS STD                       MDC00008                 $50,000
         MDC MDC PRO                       MDC00009                 $239,200
         MDC Enhanced WATS                 MDC00034                 $20,000
         MDC MDR VIA AMA                   MDC00018                 $20,000
         MDC PVN                           MDC00011                 $195,000
         MDC SMDR for PVN                  MDC00036                 $15,000
         MDC Tailored MDC 1                MDC00012                 $26,500
         MDC Tailored MDC 2                MDC00013                 $40,000
         MDC MBS Installer Tools           MDC00019                 $30,000
         MDC Tailored MDC 3                MDC00014                 $45,000
         MDC Tailored MDC 4                MDC00015                 $30,000
         MDC Tailored NARS                 MDC00016                 $50,000
         NI0 DPN Support                   NI000003                 $10,000
         NI0 DWS                           NI000004                 The fee is $50,000 plus $11,500 per DWS Access
                                                                    link.
         NI0 DWS Carrier Acc               NI000028                 $200,000 If RES00026 has been
                                                                    previously/concurrently licensed the fee is $10 K
                                                                    for the first 5 K EQUIPPED lines & $10 K for each
                                                                    add'l 5K EQUIPPED lines over the first 5 K EQUIPPED
                                                                    lines.   RES 26 MD'D IN NA04..
         NI0 DWS Flexible Acc              NI000027                 $71,500 *If ESN00003 has been previously purchased
                                                                    and more than 1 million records are required, the
                                                                    fee is $50,000.  If ESN00003 has been previously
                                                                    purchased and less than 1 million records are
                                                                    required, the fee is No Charge
         NI0 Intertol ISUP & SS7           NI000023                 $200,000  The fee for the functional group PROV0001
                                                                    is included in the fee for NI000023
         NI0 DataSPAN                      NI000002                 The fee is $20,000 per LPP cabinet.
         NI0 ISDN BASE                     NI000007                 The fee is $68,500 plus $500 per 100 ISDN Lines plus
                                                                    $250 for each 2B+D line and $100 for each 1B+D line
         NI0 ISDN PRI BASE                 NI000022                 $2,000 per PRI link.
         NI0 NI-1 BRI Enhancd Mtc          NI000009                 $68,000
         NI0 NI-1 BRI                      NI000008                 The fee is $251,000 per switch plus $7,200 per each
                                                                    increment of 480 lines.
         NI0 NI-1 PRI Ntwrkng              NI000013                 The fee is $28,000 plus $3,750 per PRI link.
         NI0 NI-1 PRI                      NI000011                 The fee is $66,500 plus $4,800 per PRI link.
         NI0 NI-1 Packet                   NI000010                 The license fee is 75K which includes the RTU the
                                                                    software on:  the first 2 NTFX10AA's
</TABLE>





<PAGE>   45

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
                                                                    (which may be x.25 and/or x.75 protocols), the first
                                                                    100 'D' terminals, and the first 10 'B' terminals.
                                                                    There is an additional 35K license fee to use the
                                                                    software on
         NI0 NI-1 Tandem                   NI000014                 $60,000
         NI0 NI-1 PRI IW 4E/5ESS           NI000012                 $50,000
         RES Disp Funct & Prvcy            RES00003                 $1,500 for each additional 100 featured lines over
                                                                    the first 100 featured lines.  This capability is
                                                                    sold in blocks of 100 featured lines.
         RES Non-Display Services          RES00005                 $1,500 for each additional 100 featured lines over
                                                                    the first 100 featured lines.  This feature is sold
                                                                    in increments of 100 featured lines.
         RES Call N.D. SW/TCAP             RES00023                 $3,000 for each additional 100 featured lines over
                                                                    the first 100.  This capability is sold in
                                                                    increments of 100 featured lines.
         RES Selective Call Fwd            RES00032                 $1,500 for each additional 100 featured lines lines
                                                                    over the first 100 featured lines.  This capability
                                                                    is sold in increments of 100 featured lines.
         RES Selective Call Rej            RES00033                 $1,500 for each additional 100 featured lines over
                                                                    the first 100 featured lines.  This capability is
                                                                    sold in increments of 100 featured lines.
         RES Dist Ring Call Wtg            RES00034                 $1,500 for each additional 100 featured lines over
                                                                    the first 100 featured lines.  This capability is
                                                                    sold in increments of 100 featured lines.
         RES Select Call Accept            RES00035                 $3,000 for each additional 100 SCA lines over the
                                                                    first 100.
         RES Access Management             RES00001                 $8,000
         RES Telemetry Applic              RES00010                 The fee is $30,000 plus $5,000 per utility telemetry
                                                                    trunk.
         RES Univ Acc to 3WC               RES00012                 $75,000
         RES Univ Acc to CLASS             RES00011                 The fee is $169,500 for the first 5000 equipped
                                                                    lines plus $90,000 for each additional 5000
                                                                    equipped lines over the first 5000.
         RES Advncd Cstm Calling           RES00002                 The fee is $15,000 for the first 100 Advanced Custom
                                                                    Calling featured lines plus $2,500 for each
                                                                    additional 100 featured lines.   This capability is
                                                                    sold in increments of 100 featured lines.
         RES & MDC Warm Line               RES00018                 $5,000
         RES Call FWD Remote Act           RES00019                 $27,000
         RES Call Screening                RES00047                 $45,000
         RES Call Wake Up Svc              RES00014                 The fee is $15,000 per switch.
         RES Expansion Svcs                RES00016                 The fee is $20,000 for the first 100 Single Line
                                                                    Variety pack featured lines plus $1,500 for each
                                                                    additional 100 featured lines over the
</TABLE>





<PAGE>   46

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
                                                                    first 100 featured lines.   This capability is sold
                                                                    in increments of 100 featured lines.
         RES Ext Bridged Svcs              RES00013                 $7,500
         RES Sbscr Prgmbl Rng Ctl          RES00037                 $13,000
         RES Sub Act Code Blking           RES00015                 $20,000
         RES Teen Service                  RES00017                 The fee is $11,500 for the first 100 Teen lines plus
                                                                    $1,500 for each additional 100 Teen lines over the
                                                                    first 100.
         RES Toll Alert                    RES00038                 $275,000
         RES Call Waiting Display          RES00025                 $15,000 for each additional 5000 EQUIPPED lines over
                                                                    the first 5000.   This capability is sold in
                                                                    increments of 5,000 equipped lines.
         RES Call Wtg Delux [TR]           RES00040                 Fee is $20 K for the first 5 K EQUIPPED lines & $20
                                                                    K for each add'l 5 K EQUIPPED lines over the first
                                                                    5 K .  This capability is sold in increments of 5K
                                                                    equipped lines.
         RES VSLE & Call Logging           RES00024                 $50,000
         RES I/F Functionality             RES00004                 The fee is $35,000.  If NTX732 has been
                                                                    previously purchased, the fee is $5,000.
         RES Bulk Call Line ID             RES00028                 The fee is $20,000 for the first 50 data links plus
                                                                    $10,000 for each additional 25 links over the first
                                                                    50.
         RES Rem Call Fwd Enh              RES00020                 $12,500
         RES SMDI CLID Suppr               RES00039                 $12,000  The fee is No CHARGE if NTXN07AA has been
                                                                    previously licensed.  The fee is per switch.
         RES Auto Recall                   RES00029                 $5,000
         RES Auto-Recall Blocking          RES00036                 The fee is $1.00 (Net Price - not subject to any
                                                                    discount) per wired line.
         RES Cust Tracing Enh              RES00031                 $3,500
         RES Signlng Routng OAM            RES00007                 $20,000
         SAID Essentials                   SAID0001                 $100,000
         SAID ESP Phase 2                  SAID0005                 $15,000
         SAID ESP                          SAID0003                 $60,000
         SAID Plus                         SAID0002                 $30,000
         SAID Universal                    SAID0004                 $60,000
         WLC 40mA current limit            WLC00004                 $5,000
         WLC Enhanced                      WLC00001                 $25,000
         WLC Line Admin                    WLC00002                 $20,000
         AIN ACB/AR Premium                AIN00018                 $5,000
         BAS RSC-S Sync                    BAS00015                 $30,000
         BAS SCM/SMS/SMU                   BAS00016                 $11,000
         BAS SCM-SLC96 Spec Svcs           BAS00027                 $12,000
         CDD Trnk Grp Mem Usage            CDD00004                 $22,500
         LOC Intl 15-Dgt Dial              LOC00004                 $75,000
         NTS Extended Capability           NTS00012                 $15,000
         SMA TR303 I/F                     SMA00001                 The fee is $50,000 per SMA or ESMA/SMA2 module.
         TEL C7 Chan-lized Access          TEL00002                 $30,000
         TEL C7 Link Flt. Locator          TEL00007                 $90,000
</TABLE>





<PAGE>   47

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
         TEL C7 Link Prot. Tester          TEL00006                 $36,000
         TEL C7 Network Integrity          TEL00009                 The fee is No Charge for a STP office because the
                                                                    fee is included in the STPE0200 OR the fee is
                                                                    $76,000 for LOCAL, TOLL, LOCAL/TOLL, TOLL/TOPS, or
                                                                    LOCAL/TOLL/TOPS offices.
         TEL C7 Routset Increment          TEL00004                 The fee is $200,000 for the first 511 route sets
                                                                    plus $25,000 per each add'l group of 256 route sets.
         TEL Gateway Screening             TEL00003                 $120,000  The fee is no charge if NTX840AA or
                                                                    NTXJ40AA has been previously licensed.
         CAIN CUSTDP Trigger               CAIN0500                 $100,000
         CAIN Extension Parms              CAIN0200                 $50,000
         CAIN SCP Simulator                CAIN0300                 $30,000
         CAIN SPECDIG Trigger              CAIN0501                 $100,000
         CAIN Test Query Tool              CAIN0400                 $30,000
         CRDS Card Services                CRDS0001                 $120,000
         CRDS MVP Card Services            CRDS0003                 $50,000
         CRDS TCAP Card Services           CRDS0002                 $25,000
         N00R N00 Routing                  N00R0001                 $100,000
         N00R N00/NXX TCAP                 N00R0002                 $125,000
         NPRI PRI Netwk Interface          NPRI0001                 $25,000 NTXS81AA functionality now ordered under
                                                                    NTS00013
         NSER Network Services             NSER0001                 $100,000
         NSER TCAP Auth & A.V.             NSER0002                 $20,000
         PRLT ISDN PRI RLT                 PRLT0001                 $175,000
         UDWS UCS Dialable Wbnd            UDWS0001                 $175,000
         UTRS UCS Trans & Rout             UTRS0001                 $90,000
         BSVR Billing Server Optn          BSVR0001                 This is a custom developed package developed for a
                                                                    single customer.  It is not available to other
                                                                    customers. Available for 2 DMS200 sites in PA only
                                                                    in LEC & LET loads.  It is x-coupled in all other
                                                                    PCLs.
         DCR DCR                           DCR00001                 $200,000
         DCR Dual X25 link                 DCR00003                 The fee is $20,000 per Network processor and $3,000
                                                                    per switch.
         DCR Mult. Net. Access             DCR00002                 $56,000
         UCSB UCS Base                     UCSB0001                 $286,700
</TABLE>





<PAGE>   48

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


***
<PAGE>   49

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


***

<PAGE>   50

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                             III. DMS-500 Extensions
                              (DMS-500 Extensions)
                                      

   
***
    



<PAGE>   51

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


***
<PAGE>   52

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


***
<PAGE>   53

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A

                                IV. RSC-S SYSTEM


     NORTEL SHALL ENGINEER EACH INITIAL SYSTEM ORDERED HEREUNDER IN ACCORDANCE
     WITH NORTEL'S STANDARD ENGINEERING PRACTICES AND PROCEDURES, AND
     THEREAFTER NORTEL SHALL PROVIDE BUYER WITH A DETAILED LIST OF THE
     COMPONENTS OF SUCH INITIAL SYSTEM.

     1.0    INITIAL RSC-S (OPTIONAL)

            1.1  THE FOLLOWING REPRESENTS THE SONET REMOTE SWITCHING CENTER
                 EQUIPMENT THAT WILL BE DELIVERED WITH THE INITIAL SYSTEM;

                 - (1) Remote Cluster Controller (RCC2) Shelf
                 - (1) Remote Maintenance Module (RMM) Shelf for Testing,
                   Diagnostics, and Alarms
                 - (1) Line Concentrating Module Enhanced (LCME), 480 Wired /
                   480 Equipped POTS Lines
                 - (1) Host LTCI, 384 Wired / 384 Equipped Ports
                 - Common equipment including XPM+
                 - CMR and UTRs
                 - Sixteen (16) DS-1 C-Side Interfaces
                 - Any required Service/Test Circuits
                 - Any required ENET, MS or processor memory expansions
                   relating to this LTCI
                 - Power Distribution equipment to support the above
                   configuration.
                 - Nortel's standard compliment of one spare per unique circuit
                   pack for the DMS-500 Initial System.

            1.2  INITIAL RSC-S SYSTEM:

                 The price for the Initial RSC-S equipped and wired as
                 described in Section 2.1 above, including host LTCI and the
                 fee for the license of the Software is Two Hundred
                 Thirty-Seven Thousand Dollars ($237,000).


2.0        RSC-S  EXTENSION PRICING

            2.1  RSC-S LINES

                 The price for an RSC-S Line Extension includes the following.
                 The LCM provides line side interface to the RSC-S.  Each RSC-S
                 Line Extension may be purchased in increments as defined
                 below:

                       a)  LCM Equipment or then current common control.

                       b)  Any required processor memory Extension.

                       c)  Any required RSC-S service/test circuits to support
                           the RSC-S Extension.

                       d)  Power Distribution Center (PDC) equipment as
                           required to support the RSC-S Extension.

                       e)  Spare circuit.





<PAGE>   54

                                                        MGC Communications, Inc.
                                                      Carrier Product Attachment
                                                                      Schedule A
                                IV. RSC-S SYSTEM





            2.2  RSC-S LINE PRICING

                 RSC-S lines may be purchased at the below listed prices:

<TABLE>
<CAPTION>
                 LINE TYPE                               INITIAL PRICE/LINE           EXTENSION PRICE/LINE
                 ---------                               ------------------           --------------------
                 <S>                                      <C>                         <C>
                 Wired Lines - Non ISDN Frame                   $60                            $90
                 Wired Lines - ISDN Frame                       $80                            $120
                 Equipped POTS                                  $26                            $39
                 Equipped MBS                                   $59                            $89
                 Equipped ISDN BRI Line                         $70                            $105
</TABLE>

                Non ISDN wired frames will be purchased in one thousand two
                hundred eighty (1,280) wired line increments.  ISDN wired
                frames will be purchased in nine hundred sixty (960) wired line
                increments.  POTS and MBS equipped lines will be purchased in
                one hundred (100) line increments.  ISDN BRI equipped lines
                will be purchased in fifty (50) line increments.





<PAGE>   55

                                                        MGC COMMUNICATIONS, INC.
                                                      CARRIER PRODUCT ATTACHMENT
                                                                      SCHEDULE B


                                   SCHEDULE B

                              SERVICES AND CHARGES


ENGINEERING

1.       Nortel shall engineer each System furnished hereunder in accordance
         with Nortel's engineering practices applicable to such Initial System
         at the time such engineering is performed.

2.       Nortel's charges for engineering each Initial System are included in
         the prices and fees for the Initial System set forth in Schedule A.

3.       The provision of any other engineering by Nortel and the charges
         associated therewith shall be as subsequently agreed in writing by
         Nortel and Buyer.

INSTALLATION

1.       Nortel shall install each Initial System furnished hereunder at the
         applicable Installation Site in accordance with Nortel's installation
         practices applicable to such Initial System at the time such
         installation is performed.

2.       Nortel's charges for performance of such installation are included in
         the prices and fees for the Initial System set forth in Schedule A.

3.       The provision of any other installation by Nortel and the charges
         associated therewith shall be as subsequently agreed in writing by
         Nortel and Buyer.

TRAINING

1.       With each Initial System furnished hereunder, Nortel shall provide to
         Buyer at no additional charge one hundred (100) days of training at
         Nortel's Training Center currently located in Raleigh, North Carolina.
         Such training shall be in any of the courses scheduled to be provided
         at that Training Center as set forth in NTI's applicable Technical
         Training Course catalog with respect to the Products described in
         Schedule A to this Product Attachment.

2.       Buyer shall be responsible for the payment of all travel and living
         expenses of its employees whom Buyer sends to receive such training.

3.       Additional Training in such courses shall be provided by Nortel to
         Buyer subject to availability and scheduling of such courses. NTI may
         change the schedule of such courses at any time. Such additional
         training shall be provided at NTI's then-current charges.





<PAGE>   56

                                                        MGC COMMUNICATIONS, INC.
                                                      CARRIER PRODUCT ATTACHMENT
                                                                      SCHEDULE B


4.       All training provided by NTI shall consist of such materials and cover
         such subject as NTI in its sole discretion determines to be
         appropriate. Nortel makes no representation concerning the ability of
         anyone to satisfactorily complete any training.

5.       Nortel may add to, or delete from, the subject matter and or medium of
         any of the training courses which NTI provides. In addition, NTI may
         reschedule such courses as NTI determines to be appropriate.

6.       The availability of any training to Buyer as set forth above shall be
         subject to any prerequisites identified by NTI in its training catalog
         or other documentation with respect to such training.

ADDITIONAL SERVICES

1.       All other services to be furnished hereunder shall be subject to
         written agreement of the parties which shall set forth the terms and
         conditions applicable to the provision of such services and a
         description of such services and the charges for such services.





<PAGE>   57

                                                        MGC COMMUNICATIONS, INC.
                                                      CARRIER PRODUCT ATTACHMENT
                                                                      SCHEDULE C


                                   SCHEDULE C

                                    DELIVERY

                            INTENTIONALLY LEFT BLANK





<PAGE>   58

                                                        MGC COMMUNICATIONS, INC.
                                                      CARRIER PRODUCT ATTACHMENT
                                                                      SCHEDULE D


                                   SCHEDULE D

                                 DOCUMENTATION

Certain documentation with respect to the Products may be made available to
Buyer on CD-ROM pursuant to the terms and conditions set forth below.

In addition, Nortel may furnish to Buyer such other documentation with respect
to the Products as Nortel deems appropriate.

HELMSMAN TERMS AND CONDITIONS

1.       DEFINITIONS

"CD-ROM" shall mean a compact disk with read-only memory.

"CD-ROM Software" shall mean the computer programs which provide basic logic,
operating instructions or user-related application instructions with respect to
the retrieval of CD-ROM Documentation, along with the documentation used to
describe, maintain and use such computer programs.

"CD-ROM Documentation" shall mean the documentation that Nortel makes available
to its customers on CD-ROM with respect to DMS-250, DMS-300, and/or DMS-STP
Systems.

2.       SCOPE

With the delivery of each Initial System ordered by Buyer, Nortel shall deliver
a CD-ROM on which the appropriate CD-ROM Documentation is contained and a user
manual which shall set forth the procedures by which Buyer may use the CD-ROM
Software to access to the CD-ROM Documentation.

Buyer shall be solely responsible for obtaining, at its cost and expense, any
computer or other equipment and software required to use the CD-ROM, CD-ROM
Software and/or CD-ROM Documentation.

Buyer may order additional CD-ROMs from Nortel at Nortel's then current fees
therefor, and any such additional CD-ROMs shall be subject to these terms and
conditions.

3.       LICENSE

Upon delivery of the CD-ROM, Nortel shall grant to Buyer a non-exclusive,
non-transferable and non-assignable license, subject to these terms and
conditions:





<PAGE>   59

                                                        MGC COMMUNICATIONS, INC.
                                                      CARRIER PRODUCT ATTACHMENT
                                                                      SCHEDULE D


(a)      to use CD-ROM Software solely to access to the CD-ROM Documentation;
         and

(b)      to use the CD-ROM Documentation solely to operate and maintain the
         Initial System with which it was delivered.

Buyer acknowledges that, as between Nortel and Buyer, Nortel retains title to
and all other rights and interest in the CD-ROM Software and CD-ROM
Documentation.  Buyer shall not modify, translate or copy the CD-ROM Software
or CD-ROM Documentation without Nortel's prior written consent.  Buyer shall
hold secret and not disclose to any person, except Buyer's employees with a
need to know, any of the CD-ROM Software or CD-ROM Documentation.

Buyer shall not sell, license, reproduce or otherwise convey or directly or
indirectly allow access to the CD-ROM Software or CD-ROM Documentation to any
other person, firm, corporation or other entity.

Except to the extent expressly set forth in this Schedule D, Nortel shall have
no obligations of any nature whatsoever with respect to the CD-ROM Software or
the CD-ROM Documentation.

4.       DISCLAIMER OF WARRANTY AND LIABILITY

NORTEL MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY NATURE WHATSOEVER WITH
RESPECT TO THE CD-ROM, CD-ROM SOFTWARE, CD-ROM DOCUMENTATION OR ANY
INFORMATION CONTAINED ON ANY OF THE FOREGOING OR ANY RESULTS OR CONCLUSIONS
REACHED BY BUYER AS A RESULT OF ACCESS TO OR USE THEREOF, OR WITH RESPECT TO
ANY OTHER MATTER OR SERVICE PROVIDED BY NORTEL, WHETHER STATUTORY, EXPRESS OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE OR AGAINST INFRINGEMENT. NORTEL SHALL NOT BE
LIABLE FOR ANY DIRECT, SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES
OF ANY NATURE WHATSOEVER INCLUDING ANY SUCH DAMAGES WHICH MAY ARISE OUT OF THE
USE OF OR INABILITY TO USE OR ACCESS THE CD-ROM, THE CD-ROM SOFTWARE, THE
CD-ROM DOCUMENTATION, AND FURTHER INCLUDING LOSS OF USE, REVENUE, PROFITS OR
ANTICIPATED SAVINGS REGARDLESS OF HOW SUCH DAMAGES MAY HAVE BEEN CAUSED.

5.       GENERAL

Nothing contained in this Schedule D shall limit, in any manner, Nortel's right
to change the CD-ROM Software or CD-ROM Documentation or the design or
characteristics of Nortel's Products at any time without notice and without
liability.





<PAGE>   60
                                                       MGC Communications, Inc.
                                                     Carrier Product Attachment
                                                                     Schedule E



                                  SCHEDULE E

                           I. REVOLVING CREDIT NOTE

<PAGE>   61


                             REVOLVING CREDIT NOTE

$4,000,000.00                  New York, New York                 May 21, 1997


         FOR VALUE RECEIVED, the undersigned, MGC COMMUNICATIONS, INC., a
Nevada corporation ("Maker"), promises to pay to the order of NORTHERN TELECOM
INC., a Delaware corporation ("Payee"), the principal sum of FOUR MILLION AND
NO/100 DOLLARS ($4,000,000.00), or so much thereof as may be advanced or deemed
advanced and outstanding hereunder from time to time, together with interest as
provided below. All payments on this Revolving Credit Note (the "Note") shall
be due and payable in lawful money of the United States of America, without
setoff, counterclaim or deduction, at the office of Payee at 2221 Lakeside
Boulevard, Richardson, Texas 75082-4399, or such other place as Payee shall
request.

         Reference is hereby made to that certain Network Products Purchase
Agreement No. MGC9701N dated as of May 21, 1997, between Maker and Payee (as
modified by that certain Product Attachment - Carrier Networks Products dated
as of May 21, 1997, between Maker and Payee [the "Attachment"], the
"Purchase Agreement"). All initially-capitalized terms used herein shall have
the meanings given such terms in the Purchase Agreement unless otherwise
defined herein. This Note is the "Revolving Note" referred to in the Purchase
Agreement.

         1. ADVANCES. On each Turnover Date for the first ten Initial Systems
(as such terms are defined in the Attachment), an amount equal to the Maximum
Amount or the Reduced Maximum Amount, as applicable, for each such Initial
System, will be advanced hereunder by the Payee for the benefit of the Maker.
The sum of all such advances at any time outstanding shall not exceed the
lesser of $4,000,000.00 or the sum of the Maximum Amount or Reduced Maximum
Amount, as applicable, for each of the first ten Initial Systems for which the
Turnover Date has occurred (such lesser amount, as reduced in accordance with
paragraph 2, being hereinafter referred to as the "Available Amount"). Advances
may be made by Payee to Maker hereunder from time to time from the date hereof
through but excluding May 21, 1999 (the "Advance Termination Date"). Payee
shall in no event make any advances hereunder during the existence of any Event
of Default (as hereinafter defined). If at any time the Available Amount
exceeds the outstanding principal balance of this Note, the Maker may request
advances hereunder to pay for software purchased under the Purchase Agreement
for use in the first ten Initial Systems. All advances shall be made by credit
against the obligations of the Maker under the Purchase Agreement. No cash
advances shall be made to the Maker. Absent manifest error, the records of the
Payee with respect to the times and amounts of the advances hereunder shall be
conclusive.

         2. REDUCTIONS IN AVAILABILITY; MANDATORY PREPAYMENTS. On each date
which is thirty months after the Turnover Date for any of the first ten Initial
Systems, the Available Amount shall be reduced by an amount equal to the
Maximum Amount (or Reduced Maximum Amount, as applicable) for such Initial
System. If at any time


<PAGE>   62

the outstanding principal balance of this Note exceeds the Available Amount (as
reduced pursuant to this paragraph 2) for any reason, the Maker shall
immediately pay the amount of such excess to the Payee.

         3. INTEREST. The unpaid principal balance from time to time
outstanding hereunder shall bear interest at a rate per annum which shall from
day to day be equal to the lesser of (a) fourteen percent (14%) (calculated
based on a 360-day year and the actual number of days elapsed) or (b) the
Maximum Lawful Rate (as hereinafter defined). Following the occurrence and
during the continuance of an Event of Default, the unpaid principal balance
outstanding hereunder, and, to the extent permitted by applicable law, any
accrued but unpaid interest, shall bear interest at a rate per annum which
shall from time to time be equal to the lesser of (a) seventeen percent (17%)
(calculated based on a 360-day year and the actual number of days elapsed) or
(b) the Maximum Lawful Rate.

         4. PAYMENTS. Beginning with the last day of the calendar quarter
following the Turnover Date for the first Initial System and continuing on the
last day of each succeeding calendar quarter thereafter through but excluding
June 30, 2002 (the "Maturity Date"), the Maker shall make payments of principal
and interest on this Note in an amount equal to ten percent (10%) of the
Maker's total gross revenue from operations for the calendar quarter ending on
such date. In the event that such payment amount is insufficient to pay all of
the accrued but unpaid interest owing under this Note on any such payment date,
the Maker may at its option pay the additional accrued but unpaid interest. Any
accrued but unpaid interest which is not paid on any payment date shall be
treated as an advance hereunder and added to the outstanding principal balance
of this Note as of the date on which such payment was due. The entire unpaid
principal balance of this Note, plus all accrued but unpaid interest thereon,
shall be due and payable in full on the Maturity Date.

         5. SECURITY. Payment and performance of this Note is secured by the
liens and security interests created by the Security Agreement of even date
herewith executed by the Maker in favor of the Payee.

         6. VOLUNTARY PREPAYMENTS. The unpaid principal balance of this Note
may be prepaid in whole or in part at any time without premium or penalty.

         7. EVENTS OF DEFAULT AND REMEDIES. Without notice or demand (which are
hereby waived), the entire unpaid principal balance of, and all accrued but
unpaid interest on, this Note shall immediately become due and payable at the
option of the holder hereof upon the occurrence of any Event of Default. The
occurrence of any one or more of the following shall constitute an Event of
Default hereunder (each an "Event of Default"): (a) a failure by Maker to make
any payment of principal or interest on this Note or any other payment required
of Maker by the Loan Documents when due and such failure continues for a period
of five (5) days after Payee has provided notice to Maker via facsimile; (b)
Maker shall fail to observe or perform any obligation, requirement, covenant or
restriction to be observed or performed by it under the Security Agreement or
any other Loan Document (other than a payment

                                       2
<PAGE>   63

described in subparagraph (a) above) and such failure continues for a period of
five (5) days after Payee has provided notice to Maker via facsimile, or a
default or event of default occurs under any other Loan Document which is not
cured within any applicable grace period provided therein; (c) any
representation or warranty made by Maker to Payee in any of the Loan Documents
or in any financial statement, representation, warranty or certificate made or
furnished to Payee in connection with the Security Agreement or any of the
other Loan Documents, or the Purchase Agreement, or as an inducement for Payee
to enter into the Security Agreement, the other Loan Documents or the Purchase
Agreement, shall be false, misleading, incorrect or incomplete in any material
respect; (d) the appointment of a receiver, trustee, conservator, or liquidator
of Maker, any guarantor of any of the Obligations (a "Guarantor"), the
Collateral or any part thereof, or any other property of Maker or of any
Guarantor which is not dismissed within thirty (30) days after its filing; (e)
a filing by Maker or any Guarantor of a voluntary petition seeking an entry of
an order for relief as a debtor in a proceeding under the United States
Bankruptcy Code or seeking reorganization or rearrangement or taking advantage
of any bankruptcy, insolvency, liquidation, conservatorship, receivership,
moratorium, rearrangement, reorganization or other similar law for the relief
of debtors, or an answer by Maker or any Guarantor admitting the material
allegations of a petition filed against Maker or a Guarantor, as the case may
be, in any bankruptcy, reorganization, insolvency, conservatorship, or similar
proceeding, or an admission by Maker or any Guarantor in writing of an
inability to generally pay its, his or their debts as they become due; (f) the
making by Maker or any Guarantor of a general assignment for the benefit of
creditors; (g) failure of Maker to generally pay its debts as they mature or
failure of any Guarantor to generally pay its debts when they mature; (h) the
filing of a petition or entry of an order for relief by or against Maker or any
Guarantor as debtor in a proceeding under the United States Bankruptcy Code by
any court of competent jurisdiction, or approving a petition seeking
reorganization of Maker or any Guarantor or an arrangement of their debts, or
appointing a receiver, trustee, conservator, or liquidator of Maker or any
Guarantor, the Collateral or any party thereof, or any other property of Maker
or of any Guarantor not dismissed within thirty (30) days after filing; (i) the
occurrence of a default by Maker or any Guarantor, or an event or condition
which, with the giving of notice or passage of time, or both, would constitute
a default by Maker or any Guarantor under any agreement between Maker or any
Guarantor and Payee; (j) the liquidation, termination, or dissolution of Maker
or any Guarantor; (k) if Maker or any Guarantor repudiates any of its
obligations under the Note or contests the validity of the security interest
granted in the Security Agreement or the enforceability of the rights and
remedies provided in the Security Agreement; (l) Maker or any Guarantor shall
have concealed, removed, or permitted to be concealed or removed, any part of
its property, with intent to hinder, delay or defraud its creditors or any of
them, or made or suffered a transfer of any of its property which may be
fraudulent under any bankruptcy, fraudulent conveyance or similar law, or shall
have made any transfer of its property to or for the benefit of a creditor at a
time when other creditors similarly situated have not been paid; or have
suffered or permitted, while insolvent, any creditor to obtain a lien upon any
of its property through legal proceedings or distraint; (m) Maker or any
Guarantor shall be in default of an obligation to pay any indebtedness greater
than Fifty Thousand

                                       3
<PAGE>   64

Dollars ($50,000) due any third person and as a result of such failure to pay,
the third person has accellerated their obligation to pay; (n) Maker or any
Guarantor shall suffer final judgments not covered by insurance for payment of
money aggregating in excess of Two Hundred Fifty Thousand Dollars ($250,000)
and shall not discharge such judgment within thirty (30) days, unless such
judgement is not subject to execution or the execution of such judgement is
stayed pending appeal; or (o) the Loan Documents shall at any time after their
execution and delivery and for any reason, due to any action or inaction of the
Maker, cease to create valid and perfected first priority liens on or security
interests in and to the property purported to be subject to such Loan
Documents. Upon the occurrence of an Event of Default, the holder of this Note
may (i) offset against this Note any sum or sums owed by the holder hereof to
Maker or any Guarantor, (ii) proceed to protect and enforce its rights either
by suit in equity and/or by action at law, or by other appropriate proceedings,
whether for the specific performance of any covenant or agreement contained in
this note, or in aid of the exercise of any power or right granted by this
Note, or to enforce any other legal or equitable right of the holder of this
Note, and/or (iii) pursue the remedies available to Payee under the Security
Agreement, the other Loan Documents, at law and otherwise.

         8. ATTORNEY'S FEES AND COSTS. In the event of any litigation between
Maker and Payee with respect to this note, the prevailing party shall be
entitled to recover its reasonable attorneys fees and expenses.

         9. CUMULATIVE RIGHTS. No delay on the part of the holder of this Note
in the exercise of any power or right under this Note, or under any other Loan
Document shall operate as a waiver thereof, nor shall a single or partial
exercise of any such power or right. Enforcement by the holder of this Note of
any security for the payment hereof shall not constitute any election by it of
remedies so as to preclude the exercise of any other remedy available to it.

         10. MAXIMUM INTEREST RATE. Regardless of any provision contained
herein, or in any other Loan Document, Payee shall never be entitled to
contract for, charge, receive, take, collect, reserve or apply, as interest on
this Note, any amount in excess of the maximum rate of interest from time to
time permitted under state or federal law applicable to the indebtedness
evidenced hereby, after taking into account any amount, fee or charge which is
characterized as interest under applicable law (the "Maximum Lawful Rate"), and
in the event Payee ever contracts for, charges, receives, takes, collects,
reserves or applies, as interest, any such excess, such amount which would be
deemed excessive interest shall be deemed a partial prepayment of principal on
this Note and treated hereunder as such; and, if this Note is paid in full, any
remaining excess shall promptly be paid to Maker. In determining whether the
interest paid or payable, under any specific contingency, exceeds the Maximum
Lawful Rate, Maker and Payee shall, to the maximum extent permitted under
applicable law, (a) characterize any nonprincipal payment as an expense, fee or
premium rather than as interest, (b) exclude voluntary prepayments and the
effects thereof, and (c) amortize, prorate, allocate and spread, as appropriate
to reflect variations in the Maximum Lawful Rate, the total amount of interest
throughout the

                                       4
<PAGE>   65
entire contemplated term of this Note, so that the interest rate does not
exceed the Maximum Lawful Rate throughout the entire term of this Note;
provided that, if the unpaid principal balance hereof is paid and performed in
full prior to the end of the full contemplated term hereof, and if the interest
received for the actual period of existence thereof exceeds the Maximum Lawful
Rate, Payee shall refund to Maker the amount of such excess and, in such event,
Payee shall not be subject to any penalties provided by any laws for
contracting for, charging, receiving, taking, collecting, reserving or applying
interest in excess of the Maximum Lawful Rate. Upon the tender by Payee or any
holder of this Note to Maker of any excess amount, Maker will be deemed to have
accepted such excess in full satisfaction of any claim (including, without
limitation, a claim of usury) arising out of such excess being contracted for,
charged, received, taken, collected, reserved or applied.

         11. WAIVER. Maker, and each surety, endorser, guarantor, and other
party ever liable for the payment of any sum of money payable on this Note,
jointly and severally waive notice, demand, presentment, protest, notice of
protest, notice of nonpayment, notice of dishonor, notice of intention to
accelerate, notice of acceleration, and any and all lack of diligence or delay
in collection or the filing of suit hereon which may occur, and agree that
their liability on this Note shall not be affected by any renewal or extension
in the time of payment hereof, by any indulgences, or by any release,
impairment or change in any security for the payment of this Note, and hereby
consent to any and all renewals, extensions, indulgences, releases, or changes
(including partial payments), regardless of the number of such renewals,
extensions, indulgences, releases or changes, without notice and for any period
or periods of time, before or after maturity, all without prejudice to the
holder. The holder shall similarly have the right to deal in any way, at any
time, with one or more of the foregoing parties without notice to any other
party, and to grant any such party any extensions of time for payment of any of
said indebtedness, or to release or substitute part or all of the collateral
securing this Note, or to grant any other indulgences or forbearance
whatsoever, without notice to any other party and without in any way affecting
the personal liability of any party hereunder.

         12. SUCCESSORS AND ASSIGNS. All of the covenants, stipulations,
promises and agreements in this Note by or on behalf of Maker shall bind
Maker's successors and assigns, whether so expressed or not; provided, however,
that Maker may not, without the prior consent of Payee, assign any rights,
powers, duties, or obligations under this Note. Any holder of this Note shall
succeed to the rights of Payee hereunder.

         13. INVALID PROVISIONS. Any provision in this Note prohibited by law
shall be ineffective only to the extent of such prohibition and shall not
invalidate the remainder of this Note.

         14. GOVERNING LAW. THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK AND APPLICABLE FEDERAL LAW.

                                       5
<PAGE>   66

         15. NOTICES. All notices or demand given hereunder shall be given as
provided in the Security Agreement.

         16. HEADINGS. The headings of the sections of this Note are inserted
for convenience only and shall not be deemed to constitute a part hereof.

         17. PAYMENTS; BUSINESS DAY. Each payment or prepayment hereon must be
paid at the office of Payee specified above in lawful money as therein
specified and in funds which are or will be available for immediate use by
Payee at such office on or before 2:00 p.m., Dallas, Texas, time on the day
such payment or prepayment is due. If a payment of principal or interest hereon
is due on a day which is not a Business Day (as defined in the Security
Agreement), Maker shall be entitled to delay such payment until the next
succeeding Business Day.

         18. FINAL AGREEMENT. THIS WRITTEN LOAN AGREEMENT, TOGETHER WITH THE
OTHER LOAN DOCUMENTS AS WRITTEN, REPRESENT THE FINAL AGREEMENT OF MAKER AND
PAYEE AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR
SUBSEQUENT ORAL AGREEMENTS OF MAKER AND PAYEE. THERE ARE NO UNWRITTEN ORAL
AGREEMENTS BETWEEN MAKER AND PAYEE.

         19. WAIVER OF JURY TRIAL. TO THE FULLEST EXTENT PERMITTED BY
APPLICABLE LAW, THE MAKER AND EACH SURETY, ENDORSER, GUARANTOR, AND OTHER PARTY
EVER LIABLE FOR THE PAYMENT OF ANY SUM OF MONEY PAYABLE ON THIS NOTE, HEREBY
IRREVOCABLY AND EXPRESSLY AND JOINTLY AND SEVERALLY WAIVE ALL RIGHT TO A TRIAL
BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER BASED UPON CONTRACT,
TORT OR OTHERWISE) ARISING OUT OF OR RELATING TO THIS NOTE, THE OTHER LOAN
DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY OR THE ACTIONS OF
THE PAYEE IN THE NEGOTIATION, ADMINISTRATION OR ENFORCEMENT THEREOF.

         EXECUTED at Las Vegas, Nevada, as of the day and year first above
written.

                                         MGC COMMUNICATIONS, INC.

                                         By:/s/ Nield J. Montgomery
                                            -----------------------------------
                                         Name:  Nield J. Montgomery
                                              ---------------------------------
                                         Title: President/CEO
                                               --------------------------------

                                                       [SEAL]


                                       6
<PAGE>   67
                                                       MGC Communications, Inc.
                                                     Carrier Product Attachment
                                                                     Schedule E



                                  SCHEDULE E

                            II. SECURITY AGREEMENT
<PAGE>   68
                               SECURITY AGREEMENT
                               ------------------
                           (MGC Communications, Inc.)

         THIS SECURITY AGREEMENT (the "Agreement") dated as of May 21, 1997, is
by and between MGC Communications, Inc., a Nevada corporation (the "Debtor"),
whose address is 3165 Palms Centre Drive, Las Vegas, Nevada 89103, and whose
Tax I.D. No. is ________________ and Northern Telecom Inc., a Delaware
corporation (the "Secured Party"), whose address is 2221 Lakeside Boulevard,
Richardson, Texas 75082-4399.

                                R E C I T A L S:

         WHEREAS, the Debtor and the Secured Party have entered into that
certain Network Products Purchase Agreement No. MGC9701N dated as of May 21,
1997 (the "Purchase Agreement"), pursuant to which the Debtor intends to
purchase from the Secured Party certain telecommunications equipment as more
fully described in the Purchase Agreement; and

         WHEREAS, the Debtor has requested the Secured Party to finance a
portion of the purchase price for the purchase by the Debtor of the first ten
Initial Systems (as defined in the Product Attachment - Carrier Networks
Products attached to the Purchase Agreement, hereinafter the "Product
Attachment") purchased under the Purchase Agreement; and

         WHEREAS, the Secured Party has agreed to finance a portion of such
purchases on the terms provided in that certain Revolving Credit Note dated
May 21, 1997, in the maximum principal amount of Four Million Dollars
($4,000,000) made by the Debtor payable to the order of the Secured Party (the
"Note"), the Purchase Agreement and this Agreement; and

         WHEREAS, the execution and delivery of this Agreement by the Debtor is
a condition to the extension of credit to the Debtor by the Secured Party;

         NOW, THEREFORE, in consideration of the premises and for other good
and valuable consideration, the adequacy, receipt and sufficiency of which are
hereby acknowledged, and in order to induce the Secured Party to extend credit
to the Debtor under the Note, the parties hereto hereby agree as follows:


<PAGE>   69



                                   ARTICLE I

                                  Definitions

         Section 1.01. Definitions. As used in this Agreement, the following
terms have the following meanings:

                  "Account" means any "account," as such term is defined in
         Article or Chapter 9 of the UCC, now owned or hereafter acquired by
         the Debtor, and, in any event, shall include, without limitation, each
         of the following, whether now owned or hereafter acquired by the
         Debtor: (a) all rights of the Debtor to payment for goods sold or
         leased or services rendered, whether or not earned by performance, (b)
         all accounts receivable of the Debtor, (c) all rights of the Debtor to
         receive any payment of money or other form of consideration, (d) all
         security pledged, assigned or granted to or held by the Debtor to
         secure any of the foregoing, (e) all guaranties of, or
         indemnification's with respect to, any of the foregoing, and (f) all
         rights of the Debtor as an unpaid seller of goods or services,
         including, but not limited to, all rights of stoppage in transit,
         replevin, reclamation and resale.

                  "Agreement" has the meaning specified in the preamble to this
         Agreement.

                  "Business Day" means any day on which Secured Party is open
         for its general business at its offices in Richardson, Texas.

                  "Chattel Paper" means any "chattel paper," as such term is
         defined in Article or Chapter 9 of the UCC, now owned or hereafter
         acquired by the Debtor.

                  "Collateral" has the meaning specified in Section 2.01 of
         this Agreement.

                  "Debtor" has the meaning specified its the preamble to this
         agreement.

                  "Default Rate" means the lesser of (a) seventeen percent
         (17%) per annum or (b) the Maximum Lawful Rate (as defined in the
         Note).

                  "Document" means any "document," as such term is defined in
         Article or Chapter 9 of the UCC, sold to the Debtor now owned or
         hereafter acquired by the Debtor, including, without limitation, all
         documents of title and all receipts covering, evidencing or
         representing goods now owned or hereafter acquired by the Debtor.

                  "Equipment" means any "equipment," as such term is defined in
         Article or Chapter 9 of the UCC, sold to the Debtor by the Secured
         Party including, without limitation, the equipment shown on Schedule 1
         attached hereto and incorporated herein by reference, and any and all
         additions, substitutions and replacements of any of the foregoing,
         wherever located, together with all attachments, components, parts,
         equipment and accessories installed thereon or affixed thereto.

                                       2
<PAGE>   70

                  "General Intangibles" means any "general intangibles," as
         such term is defined in Article or Chapter 9 of t he UCC, now owned or
         hereafter acquired by the Debtor and, in any event, shall include,
         without limitation, each of the following, whether now owned or
         hereafter acquired by the Debtor: (a) all of the Debtor's service
         marks, trade names, trade secrets, registrations, goodwill,
         franchises, licenses, permits, proprietary information, customer
         lists, designs and inventions; (b) all of the Debtor's books, records,
         data, plans, manuals, computer software, computer tapes, computer
         disks, computer programs, source codes, object codes and all rights of
         the Debtor to retrieve data and other information from third parties;
         (c) all of the Debtor's contract rights, partnership interests, joint
         venture interests, securities, deposit accounts, investment accounts
         and certificates of deposit; (d) all rights of the Debtor to payment
         under letters of credit and similar agreements; (e) all tax refunds
         and tax refund claims of the Debtor; (f) all choices in action and
         causes of action of the Debtor (whether arising in contract, tort or
         otherwise and whether or not currently in litigation) and all
         judgments in favor of the Debtor; (g) all rights and claims of the
         Debtor under warranties and indemnities; and (h) all rights of the
         Debtor under any insurance, surety or similar contract or arrangement.

                  "Instrument" means any "instrument," as such term is defined
         in Article or Chapter 9 of the UCC, now owned or hereafter acquired by
         the Debtor, and, in any event, shall include all promissory notes,
         drafts, bills of exchange and trade acceptances of the Debtor, whether
         now owned or hereafter acquired.

                  "Loan Documents" means this Agreement, the Note, and each
         other certificate, document, instrument or agreement executed or
         delivered the connection with any of the forgoing, as the same may be
         amended restated, supplemented or otherwise modified from time to
         time.

                  "Lien" means any claim, mortgage, deed of trust, pledge,
         security interest, encumbrance, lien, or charge of any kind
         (including, without limitation, any agreement to give any of the
         foregoing, any conditional sale or other title retention agreement or
         any lease, consignment or bailment in the nature thereof).

                  "Note" has the meaning specified in the Recitals to this
         Agreement.

                  "Obligations" means the obligations, indebtedness and
         liabilities of Debtor under the Note, the Purchase Agreement, this
         Agreement and the other Loan Documents.

                  "Person" means an individual, partnership, join venture,
         corporation, joint stock company, bank, trust, unincorporated
         organization or a government or any department or agency thereof.

                  "Proceeds" means any "proceeds," as such term is defined in
         Article or Chapter 9 of the UCC and, in any event, shall include, but
         not be limited to, (a) any and all proceeds of any insurance,
         indemnity, warranty or guaranty payable to the Debtor

                                       3
<PAGE>   71

         from time to time with respect to any of the Collateral, (b) any and
         all payments (in any form whatsoever) made or due and payable to the
         Debtor from time to time in connection with any requisition,
         confiscation, condemnation, seizure or forfeiture of all or any part
         of the Collateral by any governmental authority (or any Person acting,
         or purporting to act, for or on behalf of any governmental authority),
         and (c) any and all other amounts from time to time paid or payable
         under or in connection with any of the Collateral.

                  "Purchase Agreement" has the meaning specified in the
         Recitals to this Agreement.

                  "Secured Party" has the meaning specified the preamble to
         this Agreement.

                  "Software" means any and all software sold or licensed by the
         Secured Party to the Debtor, including without limitation all source
         code and object code, and all manuals and other documentation relating
         thereto and each copy thereof regardless of the media in which they
         are stored.

                  "UCC" means the Uniform Commercial Code as in effect in the
         State of New York; provided, that if, by applicable law, the
         perfection or effect of perfection or non-perfection of the security
         interest created hereunder in any Collateral is governed by the
         Uniform Commercial Code as in effect on or after the date hereof in
         any other jurisdiction, "UCC" means the Uniform Commercial Code as in
         effect in such other jurisdiction for purposes of the provisions
         hereof relating to such perfection or the effect of perfection or
         non-perfection.

         Section 1.02. Other Definitional Provisions. References to "Sections,"
"subsections," "Exhibits" and "Schedules" shall be to Sections, subsections,
Exhibits and Schedules, respectively, of this Agreement unless otherwise
specifically provided. All definitions contained in this Agreement are equally
applicable to the singular and plural forms of the terms defined. All
references to statutes and regulations shall include any amendments of the same
and any successor statutes and regulations. References to particular sections
of the UCC should be read to refer also to parallel sections of the Uniform
Commercial Code as enacted in each state or other jurisdiction where any
portion of the Collateral is or may be located.

                                   ARTICLE II

                               Security Interest

         Section 2.01. Collateral for Security Interest. As collateral security
for the prompt payment and performance in full when due of the Obligations
(whether at stated maturity, by acceleration or otherwise), the Debtor hereby
pledges and assigns (as collateral) to the Secured Party, and grants to the
Secured Party a continuing lien on and security interest in, all of the
Debtor's right, title and interest in and to the following, with respect to the
first ten (10) DMS-500 Initial Systems (the "Ten Initial Systems") purchased
pursuant to the

                                       4
<PAGE>   72

Purchase Agreement, whether now owned or hereafter arising or acquired and
wherever located (collectively, the "Collateral"):

         (a)      all Equipment;

         (b)      all Software;

         (c)      the proceeds, in cash or otherwise, of any of the property
                  described in the foregoing clauses (a) through (b) and all
                  liens, security, rights, remedies and claims of the Debtor
                  with respect thereto;

         (d)      all Proceeds and products of any or all of the foregoing.

         Section 2.02. Debtor Remains Liable. Notwithstanding anything to the
contrary contained herein, (a) the Debtor shall remain liable under the
contracts, agreements, documents and instruments included in the Collateral to
the extent set forth therein to perform all of its duties and obligations
thereunder to the same extent as if this Agreement had not been executed, (b)
the exercise by the Secured Party of any of its rights or remedies hereunder
shall not release the Debtor from any of its duties or obligations under the
contracts, agreements, documents and instruments included in the Collateral,
and (c) the Secured Party shall not have any indebtedness, liability or
obligation under any of the contracts, agreements, documents and instruments
included in the Collateral by reason of this Agreement, and the Secured Party
shall not be obligated to perform any of the obligations or duties of the
Debtor thereunder or to take any action to collect or enforce any claim for
payment assigned hereunder.

         Section 2.03. Subordination of Security Interest.Upon the Debtor's
complete payment of the total purchase price, less Four Hundred Thousand
($400,000.00) Dollars (the "Initial Payment") for any one or more of the Ten
Initial Systems, the Secured Party shall subordinate its security interest in
such of the Ten Initial Systems as to which such payments have been received in
favor of a third party lender; provided however, that such subordination shall
be limited such that the security interest in favor of a third party lender to
which the Secured Party's security interest is subordinate cannot secure the
indebtedness in excess of the amount of the Initial Payment with respect to
that Initial System or eighty percent (80%) of the fair market value of the
Initial System, which ever is greater.

                                  ARTICLE III

                         Representations and Warranties

         To induce the Secured Party to enter into this Agreement and to make
credit available under the Notes, the Debtor represents and warrants to the
Secured Party that:

         Section 3.01. Title. The Debtor is, and with respect to Collateral
acquired after the date hereof the Debtor will be, the legal and beneficial
owner of the Collateral free and clear of any Lien or other encumbrance, except
for Liens in favor of the Secured Party.

                                       5
<PAGE>   73

         Section 3.02. Financing Statements. No financing statement, security
agreement or other Lien instrument covering all or any part of the Collateral
is on file in any public office, except as may have been filed in favor of the
Secured Party pursuant to this Agreement and except for other financing
statements evidencing Liens in favor of the Secured Party. Except as otherwise
disclosed on Schedule 2 hereto, the Debtor does not do business and has not
done business within the past five (5) years under a trade name or any name
other than its legal name set forth at the beginning of this Agreement.

         Section 3.03. Principal Place of Business. The principal place of
business and chief executive office of the Debtor, and the office where the
Debtor keeps its books and records, is located at the address of the Debtor
shown at the beginning of this Agreement.

         Section 3.04. Location of Collateral. All Equipment of the Debtor is
located at the places specified on Schedule 3 hereto. If any such location is
leased by the Debtor, the name and address of the landlord leasing such
location is identified on Schedule 3 hereto. The Debtor has exclusive
possession and control of its Equipment. None of the Equipment of the Debtor is
evidenced by a Document (including, without limitation, a negotiable document
of title).

         Section 3.05. Perfection. Upon the filing of Uniform Commercial Code
financing statements in the jurisdictions listed on Schedule 4 attached hereto,
the security interest in favor of the Secured Party created herein will
constitute a valid and perfected Lien upon and security interest in the
Collateral subject to no equal or prior Liens.

                                   ARTICLE IV

                                   Covenants

         The Debtor covenants and agrees with the Secured Party that until the
Obligations are paid and performed in full:

         Section 4.01. Encumbrances. The Debtor shall not create, permit or
suffer to exist, and shall defend the Collateral against, any Lien or other
encumbrance on the Collateral (other than the Lien created by this Agreement),
and shall defend the Debtor's title to and other rights in the Collateral and
the Secured Party's pledge and collateral assignment of and security interest
in the Collateral against the claims and demands of all Persons. The Debtor
shall do nothing to impair the rights of the Secured Party in the Collateral.

         Section 4.02. Disposition of Collateral. The Debtor shall not sell,
lease, assign (by operation of law or otherwise) or otherwise dispose of, or
grant any option with respect to, the Collateral or any part thereof without
the prior written consent of the Secured Party, which will not be unreasonably
withheld.

         Section 4.03. Further Assurances. At any time and from time to time,
upon the request of the Secured Party, and at the sole expense of the Debtor,
the Debtor shall promptly execute and deliver all such further agreements,
documents and instruments and take such further action as the Secured Party may
deem necessary or appropriate to

                                       6
<PAGE>   74

preserve and perfect its security interest in and pledge and collateral
assignment of the Collateral and carry out the provisions and purposes of this
Agreement or to enable the Secured Party to exercise and enforce its rights and
remedies hereunder with respect to any of the Collateral. Without limiting the
generality of the foregoing, the Debtor shall (a) execute and deliver to the
Secured Party such financing statements as the Secured Party may from time to
time require; (b) deliver and pledge to the Secured Party all Documents
(including, without limitation, documents of title) evidencing Equipment and
cause the Secured Party to be named as lienholder on all such Documents of
title; and (c) execute and deliver to the Secured Party such other agreements,
documents and instruments as the Secured Party may require to perfect and
maintain the validity, effectiveness and priority of the Liens intended to be
created by the Loan Documents. The Debtor authorizes the Secured Party to file
one or more financing or continuation statements, and amendments thereto,
relating to all or any part of the Collateral without the signature of the
Debtor where permitted by law. A carbon, photographic or other reproduction of
this Agreement or of any financing statement covering the Collateral or any
part thereof shall be sufficient as a financing statement and may be filed as a
financing statement.

         Section 4.04. Insurance. The Debtor shall maintain insurance covering
the Collateral in an amount equal to the full replacement cost thereof naming
the Secured Party as loss payee and additional insured. Recoveries under any
such policy of insurance shall be paid to the Secured Party as its interest may
appear.

         Section 4.05. Bailees. If any of the Collateral is at any time in the
possession or control of any warehouseman, bailee or any of the Debtor's agents
or processors, the Debtor shall notify such warehouseman, bailee, agent or
processor of the security interest created hereunder and shall instruct such
Person to hold such Collateral for the Secured Party's account subject to the
Secured Party's instructions.

         Section 4.06. Inspection Rights. The Debtor shall permit the Secured
Party and its representatives to examine, inspect and audit the Collateral and
to examine, inspect and audit the Debtor's books and records relating to the
Collateral.

         Section 4.07. Mortgagee and Landlord Waivers. The Debtor shall cause
each mortgagee of real property owned by the Debtor and each landlord of real
property leased by the Debtor to execute and deliver instruments satisfactory
in form and substance to the Secured Party by which such mortgagee or landlord
waives its rights, if any, in the Collateral.

         Section 4.08. Corporate Changes. The Debtor shall not change its name,
identity or corporate structure in any manner that might make any financing
statement filed in connection with this Agreement seriously misleading unless
the Debtor shall have given the Secured Party thirty (30) days prior written
notice thereof and shall have taken all action deemed necessary or desirable by
the Secured Party to protect its Liens and the perfection and priority thereof.
The Debtor shall not change its principal place of business, chief executive
office or the place where it keeps its books and records unless it shall have
given the Secured Party thirty (30) days prior written notice thereof and shall
have taken all

                                       7
<PAGE>   75

action deemed necessary or desirable by the Secured Party to cause its security
interest in the Collateral to be perfected with the priority required by this
Agreement.

         Section 4.09. Books and Records; Information. The Debtor shall keep
accurate and complete books and records of the Collateral and the Debtor's
business and financial condition in accordance with generally accepted
accounting principles consistently applied. The Debtor shall from time to time
at the request of the Secured Party deliver to the Secured Party such
information regarding the Collateral and the Debtor as the Secured Party may
reasonably request, including, without limitation, lists and descriptions of
the Collateral and evidence of the identity and existence of the Collateral. To
the extent required by Section 4.03 of this Agreement, the Debtor shall mark
its books and records to reflect the security interest of the Secured Party
under this Agreement.

         Section 4.10.  Equipment

         (a)      The Debtor shall keep the Equipment only at any of the
locations specified on Schedule 2 hereto or, upon thirty (30) days prior
written notice to the Secured Party, at such other places within the United
States of America where all action required to perfect the Secured Party's
security interest in the Equipment with the priority required by this Agreement
shall have been taken.

         (b)      The Debtor shall maintain the Equipment (ordinary wear and
tear excepted) in accordance with any manufacturer's manual. The Debtor shall
not permit any waste or destruction of the Equipment or any part thereof. The
Debtor shall not permit the Equipment to be used in violation of any law, rule
or regulation or the terms of any policy of insurance. The Debtor shall not use
or permit any of the Equipment to be used in any manner or for any purpose that
would impair its value in any material respect or expose it to unusual risk.

         Section 4.11. Warehouse Receipts Non-Negotiable. The Debtor agrees
that if any warehouse receipt or receipt in the nature of a warehouse receipt
is issued in respect of any of the Collateral, such warehouse receipt or
receipt in the nature thereof shall not be "negotiable" (as such term is used
in Section 7.104 of the UCC) unless such warehouse receipt or receipt in the
nature thereof is delivered to the Secured Party.

         Section 4.12. Notification. The Debtor shall promptly notify the
Secured Party of (a) any Lien, encumbrance or claim that has attached to or
been made or asserted against any of the Collateral, (b) any material change in
any of the Collateral, including, without limitation any material damage to or
loss of Collateral, and (c) the occurrence of any other event or condition
(including, without limitation, matters as to Lien priority) that could
reasonably be expected to have a material adverse effect on the Collateral or
the security interest created hereunder.

                                       8
<PAGE>   76
                                   ARTICLE V

                          Rights of the Secured Party

         Section 5.01. Power of Attorney. The Debtor hereby irrevocably
constitutes and appoints the Secured Party and any officer or agent thereof,
with full power of substitution, as its true and lawful attorney-in-fact with
full irrevocable power and authority in the name of the Debtor or in its own
name, to take after the occurrence and during the continuance of an Event of
Default, any and all action and to execute any and all documents and
instruments which the Secured Party at any time and from time to time deems
necessary or desirable to accomplish the purposes of this Agreement and,
without limiting the generality of the foregoing, the Debtor hereby gives the
Secured Party the power and right on behalf of the Debtor and in its own name
to do any of the following, without notice to or the consent of the Debtor:

                  (i)      to demand, sue for, collect or receive, in the name
         of the Debtor or in its own name, any money or property at any time
         payable or receivable on account of or in exchange for any of the
         Collateral and, in connection therewith, endorse checks, notes,
         drafts, acceptances, money orders, documents of title or any other
         instruments for the payment of money under the Collateral or any
         policy of insurance;

                  (ii)     to pay or discharge taxes, Liens or other
         encumbrances levied or placed on or threatened against the Collateral;

                  (iii)    (A) to direct account debtors and any other parties

         liable for any payment under any of the Collateral to make payment of
         any and all monies due and to become due thereunder directly to the
         Secured Party or as the Secured Party shall direct; (B) to receive
         payment of and receipt for any and all monies, claims and other
         amounts due and to become due at any time in respect of or arising out
         of any Collateral; (C) to sign and endorse any invoices, freight or
         express bills, bills of lading, storage or warehouse receipts, drafts
         against debtors, assignments, proxies, stock powers, verifications and
         notices in connection with accounts and other documents relating to
         the Collateral; (D) to commence and prosecute any suit, action or
         proceeding at law or in equity in any court of competent jurisdiction
         to collect the Collateral or any part thereof and to enforce any other
         right in respect of any Collateral; (E) to defend any suit, action or
         proceeding brought against the Debtor with respect to any Collateral;
         (F) to settle, compromise or adjust any suit, action or proceeding
         described above and, in connection therewith, to give such discharges
         or releases as the Secured Party may deem appropriate; (G) to add or
         release any guarantor, endorser, surety or other party to any of the
         Collateral; (H) to renew, extend or otherwise change the terms and
         conditions of any of the Collateral; (I) to make, settle, compromise
         or adjust any claims under or pertaining to any of the Collateral
         (including claims under any policy of insurance); and (J) to sell,
         transfer, pledge, convey, make any agreement with respect to or
         otherwise deal with any of the Collateral as fully and completely as
         though the Secured Party were the absolute owner thereof for all
         purposes, and to do, at the Secured Party's option and the Debtor's
         expense, at any time, or from time to time, all acts and things which
         the Secured Party deems necessary to protect, preserve, maintain, or
         realize upon the Collateral and the Secured Party's security interest
         therein.
 
                                       9
<PAGE>   77

         This power of attorney is a power coupled with an interest and shall
be irrevocable. The Secured Party shall be under no duty to exercise or
withhold the exercise of any of the rights, powers, privileges and options
expressly or implicitly granted to the Secured Party in this Agreement, and
shall not be liable for any failure to do so or any delay in doing so. Neither
the Secured Party nor any Person designated by the Secured Party shall be
liable for any act or omission or for any error of judgment or any mistake of
fact or law. This power of attorney is conferred on the Secured Party solely to
protect, preserve, maintain and realize upon its security interest in the
Collateral. The Secured Party shall not be responsible for any decline in the
value of the Collateral and shall not be required to take any steps to preserve
rights against prior parties or to protect, preserve or maintain any Lien given
to secure the Collateral.

         Section 5.02. Setoff. The Secured Party shall have the right to set
off and apply against the Obligations, at any time and without notice to the
Debtor, any and all deposits (general or special, time or demand, provisional
or final) or other sums at any time credited by or owing from the Secured Party
to the Debtor whether or not the Obligations are then due. The rights and
remedies of the Secured Party hereunder are in addition to other rights and
remedies (including, without limitation, other rights of setoff) that the
Secured Party may have.

         Section 5.03. Assignment by the Secured Party. The Secured Party may
at any time assign or otherwise transfer all or any portion of its rights and
obligations under this Agreement and the other Loan Documents (including,
without limitation, the Obligations) to any other Person, and such Person shall
thereupon become vested with all the benefits thereof granted to the Secured
Party, herein or otherwise.

         Section 5.04. Performance by the Secured Party. If the Debtor shall
fail to perform any covenant or agreement contained in this Agreement, the
Secured Party may perform or attempt to perform such covenant or agreement on
behalf of the Debtor. In such event, the Debtor shall, at the request of the
Secured Party, promptly pay any amount expended by the Secured Party in
connection with such performance or attempted performance to the Secured Party,
together with interest thereon at the Default Rate from and including the date
of such expenditure to but excluding the date such expenditure is paid in full.
Notwithstanding the foregoing, it is expressly agreed that the Secured Party
shall not have any liability or responsibility for the performance of any
obligation of the Debtor under this Agreement.

                                   ARTICLE VI

                                    Default

         Section 6.01. Rights and Remedies. If an Event of Default shall have
occurred and be continuing, the Secured Party shall have the following rights
and remedies:

                       (i)      In addition to all other rights and
         remedies granted to the Secured Party in this Agreement or in any
         other Loan Document or by applicable law, the Secured Party shall have
         all of the rights and remedies of a secured party

                                      10
<PAGE>   78

         under the UCC (whether or not the UCC applies to the affected
         Collateral) and the Secured Party may also, without notice except as
         specified below, sell the Collateral or any part thereof in one or
         more parcels at public or private sale, at any exchange, broker's
         board or at any of the Secured Party's offices or elsewhere, for cash,
         on credit or for future delivery, and upon such other terms as the
         Secured Party may deem commercially reasonable or otherwise as may be
         permitted by law. Without limiting the generality of the foregoing,
         the Secured Party may (A) without demand or notice to the Debtor,
         collect, receive or take possession of the Collateral or any part
         thereof and for that purpose the Secured Party may enter upon any
         premises on which the Collateral is located and remove the Collateral
         therefrom or render it inoperable, and/or (B) sell, lease or otherwise
         dispose of the Collateral, or any part thereof, in one or more parcels
         at public or private sale or sales, at the Secured Party's offices or
         elsewhere, for cash, on credit or for future delivery, and upon such
         other terms as the Secured Party may deem commercially reasonable or
         otherwise as may be permitted by law. The Secured Party shall have the
         right at any public sale or sales, and, to the extent permitted by
         applicable law, at any private sale or sales, to bid (which bid may
         be, in whole or in part, in the form of cancellation of indebtedness)
         and become a purchaser of the Collateral or any part thereof free of
         any right or equity of redemption on the part of the Debtor, which
         right or equity of redemption is hereby expressly waived and released
         by the Debtor. Upon the request of the Secured Party, the Debtor shall
         assemble the Collateral and make it available to the Secured Party at
         any place designated by the Secured Party that is reasonably
         convenient to the Debtor and the Secured Party. The Debtor agrees that
         the Secured Party shall not be obligated to give more than five (5)
         days prior written notice of the time and place of any public sale or
         of the time after which any private sale may take place and that such
         notice shall constitute reasonable notice of such matters. The Secured
         Party shall not be obligated to make any sale of Collateral if it
         shall determine not to do so, regardless of the fact that notice of
         sale of Collateral may have been given. The Secured Party may, without
         notice or publication, adjourn any public or private sale or cause the
         same to be adjourned from time to time by announcement at the time and
         place fixed for sale, and such sale may, without further notice, be
         made at the time and place to which the same was so adjourned. The
         Debtor shall be liable for all expenses of retaking, holding,
         preparing for sale or the like, and all attorneys' fees, legal
         expenses and other costs and expenses incurred by the Secured Party in
         connection with the collection of the Obligations and the enforcement
         of the Secured Party's rights under this Agreement. The Debtor shall
         remain liable for any deficiency if the Proceeds of any sale or other
         disposition of the Collateral applied to the Obligations are
         insufficient to pay the Obligations in full. The Secured Party may
         apply the Collateral against the Obligations in such order and manner
         as the Secured Party may elect in its sole discretion. The Debtor
         waives all rights of marshalling, valuation and appraisal in respect
         of the Collateral. Any cash held by the Secured Party as Collateral
         and all cash proceeds received by the Secured Party in respect of any
         sale of, collection from or other realization upon all or any part of
         the Collateral may, in the discretion of the Secured Party, be held by
         the Secured Party as collateral for, and then or at any time
         thereafter applied in whole or in part by the Secured Party against,
         the Obligations in such order as the Secured Party shall select. Any
         surplus of such cash

                                      11
<PAGE>   79

         or cash proceeds and interest accrued thereon, if any, held by the
         Secured Party and remaining after payment in full of all the
         Obligations shall be paid over to the Debtor or to whomsoever may be
         lawfully entitled to receive such surplus; provided that the Secured
         Party shall have no obligation to invest or otherwise pay interest on
         any amounts held by it in connection with or pursuant to this
         Agreement.

                  (ii)     The Secured Party may cause any or all of the
         Collateral held by it to be transferred into the name of the Secured
         Party or the name or names of the Secured Party's nominee or nominees.

                  (iii)    The Secured Party may exercise any and all rights
         and remedies of the Debtor under or in respect of the Collateral,
         including, without limitation, any and all rights of the Debtor to
         demand or otherwise require payment of any amount under, or
         performance of any provision of, any of the Collateral.

                  (iv)     The Secured Party may collect or receive all money
         or property at any time payable or receivable on account of or in
         exchange for any of the Collateral, but shall be under no obligation
         to do so.

                  (v)      On any sale of the Collateral, the Secured Party is
         hereby authorized to comply with any limitation or restriction with
         which compliance is necessary, in the view of the Secured Party's
         counsel, in order to avoid any violation of applicable law or in order
         to obtain any required approval of the purchaser or purchasers by any
         applicable governmental authority.

                                  ARTICLE VII

                                 Miscellaneous

         Section 7.01. No Waiver; Cumulative Remedies. No failure on the part
of the Secured Party to exercise and no delay in exercising, and no course of
dealing with respect to, any right, power or privilege under this Agreement
shall operate as a waiver thereof, nor shall any single or partial exercise of
any right, power or privilege under this Agreement preclude any other or
further exercise thereof or the exercise of any other right, power, or
privilege. The rights and remedies provided for in this Agreement are
cumulative and not exclusive of any rights and remedies provided by law.

         Section 7.02. Successors and Assigns. This Agreement shall be binding
upon and inure to the benefit of the Debtor and the Secured Party and their
respective heirs, successors and assigns, except that the Debtor may not assign
any of its rights or obligations under this Agreement without the prior written
consent of the Secured Party.

         SECTION 7.03. AMENDMENT; ENTIRE AGREEMENT. THIS AGREEMENT TOGETHER
WITH THE OTHER LOAN DOCUMENTS AS WRITTEN EMBODIES THE FINAL, ENTIRE AGREEMENT
AMONG THE PARTIES HERETO AND SUPERSEDES ANY AND ALL PRIOR COMMITMENTS,
AGREEMENTS, REPRESENTATIONS AND UNDERSTANDINGS, WHETHER WRITTEN OR ORAL,
RELATING TO THE SUBJECT

                                      12
<PAGE>   80

MATTER HEREOF AND MAY NOT BE CONTRADICTED OR VARIED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OR DISCUSSIONS OF THE PARTIES
HERETO. THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES HERETO. The
provisions of this Agreement may be amended or waived only by an instrument in
writing signed by the parties hereto.

         Section 7.04. Notices. All notices and other communications provided
for in this Agreement shall be given or made by telecopy or in writing and
telecopied, mailed by certified mail return receipt requested, or delivered to
the intended recipient at the "Address for Notices" specified below its name on
the signature pages hereof; or, as to any party at such other address as shall
be designated by such party in a notice to the other party given in accordance
with this Section 7.04. Except as otherwise provided in this Agreement, all
such communications shall be deemed to have been duly given when transmitted by
telecopy or when personally delivered or, in the case of a mailed notice, three
Business Days after deposit in the mails, in each case given or addressed as
aforesaid; provided, however, that notices to the Secured Party shall be deemed
given when received by the Secured Party.

         SECTION 7.05. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD
TO CONFLICTS OF LAWS PRINCIPLES) AND APPLICABLE LAWS OF THE U.S.

         Section 7.06. Headings. The headings, captions, and arrangements used
in this Agreement are for convenience only and shall not affect the
interpretation of this Agreement.

         Section 7.07. Survival of Representations and Warranties. All
representations and warranties made in this Agreement or in any certificate
delivered pursuant hereto shall survive the execution and delivery of this
Agreement, and no investigation by the Secured Party shall affect the
representations and warranties or the right of the Secured Party to rely upon
them.

         Section 7.08. Counterparts. This Agreement may be executed in any
number of counterparts, and by the parties hereto on separate counterparts,
each of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.

         Section 7.09. Waiver of Bond. In the event the Secured Party seeks to
take possession of any or all of the Collateral by judicial process, the Debtor
hereby irrevocably waives any bonds and any surety or security relating thereto
that may be required by applicable law as an incident to such possession, and
waives any demand for possession prior to the commencement of any such suit or
action.

         Section 7.10. Severability. Any provision of this Agreement which is
determined by a court of competent jurisdiction to be prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be
ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions of this Agreement, and any such
prohibition

                                      13
<PAGE>   81

or unenforceability in any jurisdiction shall not invalidate or render
unenforceable such provision in any other jurisdiction.

         Section 7.11. Construction. The Debtor and the Secured Party
acknowledge that each of them has had the benefit of legal counsel of its own
choice and has been afforded an opportunity to review this Agreement with its
legal counsel and that this Agreement shall be construed as if jointly drafted
by the Debtor and the Secured Party.

         Section 7.12. Termination. If all of the Obligations shall have been
paid and performed in full, the Secured Party shall, upon the written request
of the Debtor, execute and deliver to the Debtor a proper instrument or
instruments acknowledging the release and termination of the security interests
created by this Agreement, and shall duly assign and deliver to the Debtor
(without recourse and without any representation or warranty) such of the
Collateral as may be in the possession of the Secured Party and has not
previously been sold or otherwise applied pursuant to this Agreement.

         SECTION 7.13. WAIVER OF JURY TRIAL. TO THE FULLEST EXTENT PERMITTED BY
APPLICABLE LAW, THE DEBTOR HEREBY IRREVOCABLY AND EXPRESSLY WAIVES ALL RIGHT TO
A TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER BASED UPON
CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR RELATING TO THIS AGREEMENT OR
THE TRANSACTIONS CONTEMPLATED HEREBY OR THE ACTIONS OF THE SECURED PARTY IN THE
NEGOTIATION, ADMINISTRATION OR ENFORCEMENT THEREOF.

                                      14
<PAGE>   82



         IN WITNESS WHEREOF, the parties hereto have duly executed this
Agreement as of the day and year first written above.

                                    DEBTOR:

                                    MGC COMMUNICATIONS, INC.

                                    By:/S/Nield J. Montgomery
                                       ----------------------------------------
                                    Name: Nield J. Montgomery
                                         --------------------------------------
                                    Title: President/CEO
                                          -------------------------------------

                                    Address for Notices:
                                    3165 Palms Centre
                                    Las Vegas, Nevada 89103
                                    Fax No.:  (702) 310-1111
                                    Telephone No.: (702) 310-1000
                                    Attention: Kent F. Heyman
                                              ---------------------------------

                                    SECURED PARTY:

                                    NORTHERN TELECOM INC.

                                    By: /S/Vickie Yohe
                                       ----------------------------------------
                                    Name:  Vickie Yohe
                                         --------------------------------------
                                    Title: Group Vice President
                                   
       [NORTEL LAW DEPT. STAMP]     Address for Notices:
                                    2350 Lakeside Boulevard
                                    Richardson, Texas  75082-4399
                                    Fax No.: (972) 684-2606
                                    Telephone No.: (972) 684-3976
                                    Attention:  General Manager and
                                                Vice President, Carrier Networks

                                      15
<PAGE>   83


                                   Schedule 1

                                   Equipment




                                      16
<PAGE>   84

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                           I. DMS-500 INITIAL SYSTEM
                           (DMS-500 SWITCHING SYSTEM)


   
***
    




<PAGE>   85

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1

                           I. DMS-500 INITIAL SYSTEM
                           (DMS-500 SWITCHING SYSTEM)



***
<PAGE>   86

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                     Schedule 1 



               II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



1.0      DMS-500 STANDARD SOFTWARE FEATURES


         1.1     Nortel may deliver Software ordered hereunder in a single
                 Software load which may include Software which Buyer has not
                 yet licensed ("Non-licensed Software").  Except as set forth
                 in Section 1.2 below, Buyer shall not be entitled to use such
                 Non-licensed Software, until such time as the applicable right
                 to use fees are paid by Buyer pursuant to Section 1.5.

         1.2     For the purpose of gathering market trial information and
                 prior to payment of any applicable right-to-use fees, certain
                 Non-licensed Software may be placed in service by Buyer on a
                 limited, non-revenue-generating, trial basis only ("Feature
                 Trial").  Buyer may request the right to evaluate such Non-
                 licensed Software for a maximum period of six (6) months
                 commencing as of the date of Nortel's written consent to such
                 Feature Trial.  Nortel shall respond to Buyer's request as
                 described above in writing.  Within ten (10) business days
                 following expiration of the agreed to Feature Trial period,
                 Buyer shall notify Nortel in writing of its plans for
                 activation or deactivation of such Non-licensed Software, and
                 the corresponding number of units activated, if applicable.

         1.3     Upon Buyer's placement of any Non-licensed Software in revenue
                 generating service, Buyer shall pay the applicable
                 right-to-use fees for such Non-licensed Software pursuant to
                 this Agreement, except as described in Section 1.2.  Buyer
                 shall also have the option to pay the applicable right-to-use
                 fees for any Non-licensed Software upon installation of a
                 Software load containing such Non-licensed Software.  For any
                 Non-licensed Software that is installed and added pursuant to
                 a product computing module load ("PCL") and or non-computing
                 module load ("NCL"), if any, the right-to-use fees shall be
                 the list price for such feature in effect as of the date of
                 activation.

         1.4     To ensure Buyer's proper activation and/or usage of the
                 appropriate Software, Buyer shall properly notify Nortel at
                 the address specified in Section 9 of this  Product Attachment
                 to the attention of Director, Sales Engineering, prior to the
                 activation and/or usage by Buyer of any Software. Buyer shall
                 identify all Software being activated and/or used (including
                 the number of units activated, if applicable) in each Intial
                 System.

         1.5     Nortel shall promptly review  notification from Buyer provided
                 pursuant to Section 1.4 above and identify any applicable
                 prerequisite Equipment or Software required by Buyer prior to
                 activation and/or usage of the applicable Software. Nortel
                 shall respond to Buyer's written notice by means of a price
                 quotation. Such price quotation shall include Nortel's consent
                 to activate and/or use such Software or notification that such
                 Software requires engineering to determine whether the current
                 switch configuration will require additional Equipment prior
                 to activation and/or usage.  Upon Buyer's written acceptance
                 of Nortel's price quotation, Nortel shall grant its consent to
                 Buyer to activate and/or use such Software prior to payment of
                 the applicable right-to-use fees.  However, under no
                 circumstances shall such Software be activated and/or used by
                 Buyer prior to Buyer's acceptance of Nortel's price quotation.
                 Nortel shall invoice Buyer for all applicable right to use
                 fees and associated feature activation engineering charges.
                 One hundred percent (100%) of such invoiced right to use fees
                 and engineering charges shall be due and payable within thirty
                 (30) days of the date of Nortel's invoice therefor.

         1.6     Notwithstanding the foregoing, Buyer shall not be required to
                 pay additional right to use fees associated with the Software
                 licensed prior to the initial date of this Product Attachment.





<PAGE>   87

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1

               II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



         1.7     Nortel reserves the right, every six (6) months to submit a
                 written report for each site containing a Software load.  The
                 written report shall identify all Software activated and/or
                 used (including the number of incremental units activated, if
                 applicable) by Buyer during the applicable reporting period.
                 Buyer shall audit the report against Purchase Order(s) which
                 have been submitted by Buyer and accepted by Nortel during the
                 applicable period to determine the existence of any
                 discrepancies.  Buyer shall submit such audited written report
                 to Nortel at the address specified in Section 9 of this
                 Product Attachment to the attention of Director, Sales
                 Engineering, within thirty (30) days from receipt of such
                 request.

         1.8     Nortel also reserves the right to access by remote polling or
                 to conduct an on-site inspection of any site in which a
                 Software load is installed and/or to perform an on-site review
                 of Buyer's books and records related to such site to verify
                 activation and/or usage of Software.

         1.9     Nortel shall issue invoices, for any applicable prices,
                 charges or fees, in addition to those amounts previously
                 invoiced, as a result of Buyer's activation and/or usage of
                 any Software that does not appear on Nortel's written report
                 or that appear as a result of Nortel's remote polling of an
                 Initial Systems.

         1.10    Upon payment of the applicable right to use fees for Software
                 activated and/or used by Buyer, Buyer shall receive a
                 non-exclusive paid-up license to use such Software in
                 accordance with the provisions of this Agreement.  Nortel may
                 immediately terminate the applicable license granted hereunder
                 for Buyer's failure to pay the applicable right to use fees
                 for such Software which has been activated and/or used.


         1.11    The obligations of Buyer under this Section 1 shall without
                 limitation survive the termination of this Agreement and shall
                 continue if the Software is removed from service. Buyer agrees
                 to indemnify Nortel or Third Party Software Vendors as
                 appropriate for any loss or damage resulting from a breach of
                 this Section 1.





<PAGE>   88

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1

               II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



2.0      LLT0B0005 SOFTWARE INCLUDED IN THE  DMS-500 INITIAL SYSTEM NOT 
         ELIGIBLE FOR "DEFERRED BILLING."

         2.1     SOFTWARE INCLUDED IN INITIAL SYSTEM  NOT ELIGIBLE FOR "DEFERRED
                 BILLING"

                 The following represents the LLT0B0005 Software packages that
                 are included in the price of the DMS-500 Initial System,
                 described in Schedule A, Part 1, Section 1.0. The following is
                 a list of Software only and does not include any/all required
                 Equipment to provide feature functionality.

<TABLE>
<CAPTION>
                  S/W PACKAGE         DESCRIPTION
                  -----------         -----------
                  <S>                <C>
                   BAS00001           Base Cook
                   BAS00002           Base ANI
                   BAS00003           Base Generic
                   BAS00004           Base OA&M
                   BAS00007           Base Logs
                   BAS00020           Base Flexible Bellcore AMA
                   BAS00028           Base DPP
                   BASE0001           Local Base
                   BASE0006           Base SN SR60
                   LOC00001           Local Services
                   SS700001           SS7 Trunk Signalling
                   TEL00001           Telecom Layer
                   TEL00002           TEL CCS7 Channelized Access
                   TEL00008           CCS7 Base
                   UDD00001           UDD Services
                   BAS00012           BAS Remote
                   EQA00001           Equal Access Local
                   EQA00002           Equal Access Toll
                   EQA00003           Cellular - Interconnect End Office
                   EQA00005           Intermediate Tandem
                   EQA00006           EQA C7ISUPLRLTA Conn. EAEO
                   EQA00007           EQA EA Alt Sw Point
                   EQA00009           EQA IBN Intra LATA  PIC EAEO
                   EQA00012           EQA C7ISUPLRLTA Conn. AT
                   NI000007           NI0 ISDN Base
                   NI000011           NI0 NI-1 PRI
                   NI000022           NI0 ISDN PRI Base
                   NTS00005           Equal Access 800
                   SMA00001           SMA TR303 I/F
</TABLE>


         2.2   CENTRAL OFFICE LIMITED USAGE FEATURES NOT ELIGIBLE FOR "DEFERRED
               BILLING."

               The Buyer has a Software license for the following Software
               features which may be utilized for the associated initial number
               of licenced units.  For each additional unit in excess of the
               initial number of units, refer to the S/W Optional Part II,
               Section 3.2 for incremental pricing and to





<PAGE>   89

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                II.DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



               Section 3.1 for special incremental software package pricing.
               The following is a list of Software only and does not include
               any/all required Equipment to provide feature functionality.

<TABLE>
<CAPTION>
                S/W PACKAGE           DESCRIPTION                                    UNIT          INITIAL UNITS
                -----------           -----------                                    ----          -------------
                                                                                                    LICENCED
                                                                                                    --------
               <S>                    <C>                                        <C>               <C>
                  LEA00001            LEAS Toll 1st 50k Directory                Directory  #       50,000
</TABLE>


2.1      LLT0B0005 SOFTWARE INCLUDED IN THE  DMS-500 INITIAL SYSTEM ELIGIBLE FOR
         "DEFERRED BILLING."

         2.1     SOFTWARE INCLUDED IN INITIAL SYSTEM  ELIGIBLE FOR "DEFERRED 
                 BILLING"

                 The following represents the LLT0B0005 Software packages that
                 are included in the price of the DMS-500 Initial System,
                 described in Schedule A, Part 1, Section 1.0. The following is
                 a list of Software only and does not include any/all required
                 Equipment to provide feature functionality.

<TABLE>
<CAPTION>
                  S/W PACKAGE         DESCRIPTION
                 -----------          -----------
                  <S>                 <C>
                  MDC00003            MDC Standard
                  MDC00004            MDC CLASS on MDC
                  MDC00006            MDC MBG Standard
                  MDC00007            MBS Minimum
                  MDC00010            MDC CLASS on MDC/MPV II
                  MDC00033            MDC Name/Number Blocking
                  RES00006            RES Service Enablers
                  RES00021            RES Anonymous Caller Rejection
                  RES00022            RES Calling Name Delivery Blocking
                  RES00027            RES Visual Message Waiting
                  RES00030            RES Customer Originated Trace
</TABLE>


         2.2   CENTRAL OFFICE LIMITED USAGE FEATURES  ELIGIBLE FOR "DEFERRED
               BILLING"

               The Buyer has a Software license for the following Software
               features which may be utilized for the associated initial number
               of licenced units.  For each additional unit in excess of the
               initial number of units, refer to the S/W Optional Part II,
               Section 3.2  for incremental pricing and to Section 3.1 for
               special incremental software package pricing. The following is a
               list of Software only and does not include any/all required
               Equipment to provide feature functionality.

<TABLE>
<CAPTION>
               S/W PACKAGE            DESCRIPTION                                    UNIT          INITIAL UNITS
               -----------            -----------                                    ----          -------------
                                                                                                    LICENCED
                                                                                                    --------
               <S>                    <C>                                        <C>               <C>
                  MDC00001            MDC Base                                   Featured Line      11,000
                  RES00003            RES Display Functionality /Privacy         Featured Line         100
                  RES00005            RES Non-Display Services                   Featured Line         100
                  RES00023            RES Calling Name Display SW                Featured Line         100
                  RES00025            RES Call Waiting Display                   Featured Line       5,000
</TABLE>





<PAGE>   90

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


               II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
                  <S>                 <C>                                        <C>                <C>
                  RES00032            RES Selective Call Forwarding              Featured Line      100
                  RES00033            RES Selective Call Rejection               Featured Line      100
                  RES00034            RES Distinctive Ringing/Call Wtg           Featured Line      100
                  RES00035            RES Selective Call Acceptance              Featured Line      100
                  RES00036            RES Auto-Recall Blck to Private No.        Featured Line      100
</TABLE>


3.0      LLT0B005 SOFTWARE OPTIONAL TO THE DMS-500 INITIAL SYSTEM

         3.1   CENTRAL OFFICE FEATURE ADDITIONS OVER LIMITED USAGE FEATURES

               The Buyer has a Software license for the following Software
               features which may be purchased at an incremental price, beyond
               the initial licenced units as indicated in Section 2.1.

<TABLE>
<CAPTION>
               S/W PACKAGE            DESCRIPTION                  UNIT           MIN. UNIT            PRICE/
               -----------            -----------                  ----           ----------           ------
                                                                                  INCREMENTS           UNIT
                                                                                  ----------           ----
                  <S>                 <C>                          <C>              <C>               <C>
                  MDC00001            MDC Base                     Featured Line      100             $14.00
                  RES00023            RES Calling Name Disp        Featured Line      100             $30.00
                  RES00025            RES Call Waiting Disp        Featured Line    5,000             $ 3.00
                  RES00036            RES Auto-Recall Blck         Featured Line        1             $ 1.00
</TABLE>


               The following six (6) Class* Software features have a right to
               use fee of twenty nine dollars ($29.00) per each Class* line in
               100 line increments, beyond the initial licenced units as
               indicated purchase on a individual basis then refer to the S/W
               Optional Part II, Section 3.2  for incremental pricing.

<TABLE>
                  <S>                 <C>
                  RES00003*           RES Display Functionality /Privacy
                  RES00005*           RES Non-Display Services
                  RES00032*           RES Selective Call Forwarding
                  RES00033*           RES Selective Call Rejection
                  RES00034*           RES Distinctive Ringing/Call Wtg
                  RES00035*           RES Selective Call Acceptance
</TABLE>


         3.2      LLT0B005 SOFTWARE OPTIONAL

         The following represents the LLT0B005 optional Software packages that
         are not included in the price of the DMS-500 Initial System as
         defined in Schedule A, Part I, Section 1.0 of this Product Attachment. 
         The following Software represents those feature packages that may be
         ordered by Buyer at an additional price for a DMS-500 Initial System
         and does not include any/all required Equipment to provide feature
         functionality.

<TABLE>
<CAPTION>
         PRODUCT NAME                      ORDER CODE               PRICE AND NOTES
         ------------                      ----------               ---------------
         <S>                               <C>                      <C>
         BASE SN SR70 Processor            BASE0009                 The upgrade if previously licensed
                                                                    from:  BASE0006 = $185,000
</TABLE>





<PAGE>   91

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


               II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
         ACD ACD Base                      ACD00001                 The fee is $500 per ACD line plus $5,000 per
                                                                    ACD user group.
         ACD MIS                           ACD00005                 The fee is $250 per ACD line.
         ACD Miscellaneous                 ACD00006                 $52,000
         ACD Compucall                     ACD00002                 The fee is $7,500 per switched virtual circuit.
         ACD Compucall-Func                ACD00007                 The fee is $42,000 per switched virtual circuit.
         ACD Ctrx Coord V&Dta              ACD00008                 The fee is $5,000 per 100 Centrex lines.
         ACD Networking                    ACD00004                 The fee is $25,000 for the first 100 Network
                                                                    ACD lines plus $500.00 per Network ACD line over the
                                                                    first 100.
         ACD Network ACD on PRI            ACD00010                 The fee is $400.00 per ACD line.
         ACD Network ACD on SS7            ACD00009                 The fee is $400.00 per ACD line.
         AIN Essentials                    AIN00002                 $700,000
         AIN Default Routing               AIN00010                 $65,000
         AIN Call Management               AIN00006                 $200,000
         AIN Call Model Cntrl              AIN00007                 $190,000
         AIN Primer                        AIN00001                 The fee is $80,000 Net (not subject to any
                                                                    discounts) to be paid annually.
         AIN SSP Svcs Enhcemnts            AIN00011                 $40,000
         BAS ABBT LM-Cut Re-wrt            BAS00049                 $8,000
         BAS Enh Permanent Signal          BAS00041                 $40,000
         BAS MAP TELNET Access             BAS00021                 No Charge
         BAS SDM Table Access              BAS00022                 No Charge
         BAS RSC-S                         BAS00009                 The fee is $120,000 per module incremental.
         BAS Remotes Generic               BAS00012                 $700.00 per LCM/LCME in the Remote office +
                                                                    $5,500/Remote
         DTP Datapath                      DTP00001                 $17,500
         DTP DataCall Tester               DTP00003                 No Charge
         ENS E911                          ENS00005                 $15,000
         ENS ACD PSAP                      ENS00002                 The fee is $47,000 plus $2,000 per E911 position.
                                                                    The fee is $32,000 plus $2,000 per E911 position if
                                                                    ENS00001 has been previously licensed.
         ENS LDT PSAP                      ENS00001                 $125,000
         ENS Large SRDB                    ENS00004                 If more than 1 million records are required the
                                                                    fee is $195,000*.  If less than 1 million records
                                                                    are required the fee is $145,000*.
         EQA Local                         EQA00001                 $4,800 per LGC/LGCI, $4,800 per LTC/LTCI, and $1,600
                                                                    per LME.  The total fee shall not exceed $72,000 per
                                                                    office.
         EQA Toll                          EQA00002                 $1,200 per DCM and $300.00 per TM.  The total shall
                                                                    not exceed $190,000 per office.
         EQA Celular Interconnect          EQA00004                 $25,000
         EQA Enh WATS O.[POTS              EQA00010                 $20,000
         EQA Equal Access OSS              EQA00011                 $8,000
         EQA POTS IraLATA PICeaeo          EQA00008                 $20,000
         EQA Intermediate Tandem           EQA00005                 $20,000
         ISUP Cellular                     ISUP0001                 $150,000
         LEA LEAS Local                    LEA00002                 $22,500
         LEA LEAS Toll                     LEA00001                 $20,000 for each additional Group of 10,000
                                                                    Directory numbers over the first 50,000.
</TABLE>

<PAGE>   92

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                II.DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
         LEA SS7 I/W with LEAS             LEA00003                 $30,000
         LOC Carrier Parameter             LOC00002                 $20,000
         MDC - MDC Minimum                 MDC00001                 $1,750 per group of 100 MDC lines, not to exceed
                                                                    $404,000 per office.  The first 100 MDC lines are
                                                                    included in the base price.
         MDC - MDC MSAC                    MDC00002                 $21,733
         MDC Personal Call Screen          MDC00020                 $5,000
         MDC Teen Service                  MDC00035                 The fee is $5,000 per 100 MDC lines
         MDC MBG Min                       MDC00005                 $73,500
         MDC NETNAME Expand                MDC00025                 $2,000
         MDC MBS STD                       MDC00008                 $50,000
         MDC MDC PRO                       MDC00009                 $239,200
         MDC Enhanced WATS                 MDC00034                 $20,000
         MDC MDR VIA AMA                   MDC00018                 $20,000
         MDC PVN                           MDC00011                 $195,000
         MDC SMDR for PVN                  MDC00036                 $15,000
         MDC Tailored MDC 1                MDC00012                 $26,500
         MDC Tailored MDC 2                MDC00013                 $40,000
         MDC MBS Installer Tools           MDC00019                 $30,000
         MDC Tailored MDC 3                MDC00014                 $45,000
         MDC Tailored MDC 4                MDC00015                 $30,000
         MDC Tailored NARS                 MDC00016                 $50,000
         NI0 DPN Support                   NI000003                 $10,000
         NI0 DWS                           NI000004                 The fee is $50,000 plus $11,500 per DWS Access
                                                                    link.
         NI0 DWS Carrier Acc               NI000028                 $200,000 If RES00026 has been
                                                                    previously/concurrently licensed the fee is $10 K
                                                                    for the first 5K EQUIPPED lines & $10K for each
                                                                    add'l 5K EQUIPPED lines over the first 5K EQUIPPED
                                                                    lines.  RES 26 MD'D IN NA04.
         NI0 DWS Flexible Acc              NI000027                 $71,500 *If ESN00003 has been previously purchased
                                                                    and more than 1 million records are required, the
                                                                    fee is $50,000.  If ESN00003 has been previously
                                                                    purchased and less than 1 million records are
                                                                    required, the fee is No Charge
         NI0 Intertol ISUP & SS7           NI000023                 $200,000  The fee for the functional group PROV0001
                                                                    is included in the fee for NI000023
         NI0 DataSPAN                      NI000002                 The fee is $20,000 per LPP cabinet.
         NI0 ISDN BASE                     NI000007                 The fee is $68,500 plus $500 per 100 ISDN Lines plus
                                                                    $250 for each 2B+D line and $100 for each 1B+D line
         NI0 ISDN PRI BASE                 NI000022                 $2,000 per PRI link.
         NI0 NI-1 BRI Enhancd Mtc          NI000009                 $68,000
         NI0 NI-1 BRI                      NI000008                 The fee is $251,000 per switch plus $7,200 per each
                                                                    increment of 480 lines.
         NI0 NI-1 PRI Ntwrkng              NI000013                 The fee is $28,000 plus $3,750 per PRI link.
         NI0 NI-1 PRI                      NI000011                 The fee is $66,500 plus $4,800 per PRI link.
         NI0 NI-1 Packet                   NI000010                 The license fee is 75K which includes the RTU the
                                                                    software on:  the first 2 NTFX10AA's
</TABLE>





<PAGE>   93

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                II.DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
                                                                    (which may be x.25 and/or x.75 protocols), the first
                                                                    100 'D' terminals, and the first 10 'B' terminals.
                                                                    There is an additional 35K license fee to use the
                                                                    software on
         NI0 NI-1 Tandem                   NI000014                 $60,000
         NI0 NI-1 PRI IW 4E/5ESS           NI000012                 $50,000
         RES Disp Funct &Prvcy             RES00003                 $1,500 for each additional 100 featured lines over
                                                                    the first 100 featured lines.  This capability is
                                                                    sold in blocks of 100 featured lines.
         RES Non-Display Services          RES00005                 $1,500 for each additional 100 featured lines over
                                                                    the first 100 featured lines.  This feature is sold
                                                                    in increments of 100 featured lines.
         RES Call N.D. SW/TCAP             RES00023                 $3,000 for each additional 100 featured lines over
                                                                    the first 100.  This capability is sold in
                                                                    increments of 100 featured lines.
         RES Selective Call Fwd            RES00032                 $1,500 for each additional 100 featured lines lines
                                                                    over the first 100 featured lines.  This capability
                                                                    is sold in increments of 100 featured lines.
         RES Selective Call Rej            RES00033                 $1,500 for each additional 100 featured lines over
                                                                    the first 100 featured lines.  This capability is
                                                                    sold in increments of 100 featured lines.
          RES Dist Ring Call Wtg           RES00034                 $1,500 for each additional 100 featured lines over
                                                                    the first 100 featured lines.  This capability is
                                                                    sold in increments of 100 featured lines.
         RES Select Call Accept            RES00035                 $3,000 for each additional 100 SCA lines over the
                                                                    first 100.
         RES Access Management             RES00001                 $8,000
         RES Telemetry Applic              RES00010                 The fee is $30,000 plus $5,000 per utility telemetry
                                                                    trunk.
         RES Univ Acc to 3WC               RES00012                 $75,000
         RES Univ Acc to CLASS             RES00011                 The fee is $169,500 for the first 5000 equipped
                                                                    lines plus $90,000 for each additional 5000
                                                                    equipped lines over the first 5000.
         RES Advncd Cstm Calling           RES00002                 The fee is $15,000 for the first 100 Advanced Custom
                                                                    Calling featured lines plus $2,500 for each
                                                                    additional 100 featured lines.  This capability is
                                                                    sold in increments of 100 featured lines.
         RES & MDC Warm Line               RES00018                 $5,000
         RES Call FWD Remote Act           RES00019                 $27,000
         RES Call Screening                RES00047                 $45,000
         RES Call Wake Up Svc              RES00014                 The fee is $15,000 per switch.
         RES Expansion Svcs                RES00016                 The fee is $20,000 for the first 100 Single Line
                                                                    Variety pack featured lines  plus $1,500 for each
                                                                    additional 100 featured lines over the
</TABLE>





<PAGE>   94

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                II.DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
                                                                    first 100 featured lines.  This capability is sold
                                                                    in increments of 100 featured lines.
         RES Ext Bridged Svcs              RES00013                 $7,500
         RES Sbscr Prgmbl Rng Ctl          RES00037                 $13,000
         RES Sub Act Code Blking           RES00015                 $20,000
         RES Teen Service                  RES00017                 The fee is $11,500 for the first 100 Teen lines plus
                                                                    $1,500 for each additional 100 Teen lines over the
                                                                    first 100.
         RES Toll Alert                    RES00038                 $275,000
         RES Call Waiting Display          RES00025                 $15,000 for each additional 5000 EQUIPPED lines over
                                                                    the first 5000.  This capability is sold in
                                                                    increments of 5,000 equipped lines.
         RES Call Wtg Delux [TR]           RES00040                 Fee is $20 K for the first 5K EQUIPPED lines & $20
                                                                    K for each add'l 5K EQUIPPED lines over the first
                                                                    5K.  This capability is sold in increments of 5K
                                                                    equipped lines.
         RES VSLE & Call Logging           RES00024                 $50,000
         RES I/F Functionality             RES00004                 The fee is $35,000.  If NTX732 has been previously purchased, 
                                                                    the fee is $5,000.
         RES Bulk Call Line ID             RES00028                 The fee is $20,000 for the first 50 data links plus
                                                                    $10,000 for each additional 25 links over the first
                                                                    50.
         RES Rem Call Fwd Enh              RES00020                 $12,500
         RES SMDI CLID Suppr               RES00039                 $12,000  The fee is No CHARGE if NTXN07AA has been
                                                                    previously licensed.  The fee is per switch.
         RES Auto Recall                   RES00029                 $5,000
         RES Auto-Recall Blocking          RES00036                 The fee is $1.00 (Net Price - not subject to any
                                                                    discount) per wired line.
         RES Cust Tracing Enh              RES00031                 $3,500
         RES Signlng Routng OAM            RES00007                 $20,000
         SAID Essentials                   SAID0001                 $100,000
         SAID ESP Phase 2                  SAID0005                 $15,000
         SAID ESP                          SAID0003                 $60,000
         SAID Plus                         SAID0002                 $30,000
         SAID Universal                    SAID0004                 $60,000
         WLC 40mA current limit            WLC00004                 $5,000
         WLC Enhanced                      WLC00001                 $25,000
         WLC Line Admin                    WLC00002                 $20,000
         AIN ACB/AR Premium                AIN00018                 $5,000
         BAS RSC-S Sync                    BAS00015                 $30,000
         BAS SCM/SMS/SMU                   BAS00016                 $11,000
         BAS SCM-SLC96 Spec Svcs           BAS00027                 $12,000
         CDD Trnk Grp Mem Usage            CDD00004                 $22,500
         LOC Intl 15-Dgt Dial              LOC00004                 $75,000
         NTS Extended Capability           NTS00012                 $15,000
         SMA TR303 I/F                     SMA00001                 The fee is $50,000 per SMA or ESMA/SMA2 module.
         TEL C7 Chan-lized Access          TEL00002                 $30,000
         TEL C7 Link Flt. Locator          TEL00007                 $90,000
</TABLE>





<PAGE>   95

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


               II. DMS-500 STANDARD FEATURES / OPTIONAL FEATURES
                       (DMS-500 INITIAL SYSTEM SOFTWARE)



<TABLE>
         <S>                               <C>                      <C>
         TEL C7 Link Prot. Tester          TEL00006                 $36,000
         TEL C7 Network Integrity          TEL00009                 The fee is No Charge for a STP office because the
                                                                    fee is included in the STPE0200 OR the fee is
                                                                    $76,000 for LOCAL, TOLL, LOCAL/TOLL, TOLL/TOPS, or
                                                                    LOCAL/TOLL/TOPS offices.
         TEL C7 Routset Increment          TEL00004                 The fee is $200,000 for the first 511 route sets
                                                                    plus $25,000 per each add'l group of 256 route sets.
         TEL Gateway Screening             TEL00003                 $120,000  The fee is no charge if NTX840AA or
                                                                    NTXJ40AA has been previously licensed.
         CAIN CUSTDP Trigger               CAIN0500                 $100,000
         CAIN Extension Parms              CAIN0200                 $50,000
         CAIN SCP Simulator                CAIN0300                 $30,000
         CAIN SPECDIG Trigger              CAIN0501                 $100,000
         CAIN Test Query Tool              CAIN0400                 $30,000
         CRDS Card Services                CRDS0001                 $120,000
         CRDS MVP Card Services            CRDS0003                 $50,000
         CRDS TCAP Card Services           CRDS0002                 $25,000
         N00R N00 Routing                  N00R0001                 $100,000
         N00R N00/NXX TCAP                 N00R0002                 $125,000
         NPRI PRI Netwk Interface          NPRI0001                 $25,000 NTXS81AA functionality now ordered under
                                                                    NTS00013
         NSER Network Services             NSER0001                 $100,000
         NSER TCAP Auth & A.V.             NSER0002                 $20,000
         PRLT ISDN PRI RLT                 PRLT0001                 $175,000
         UDWS UCS Dialable Wbnd            UDWS0001                 $175,000
         UTRS UCS Trans & Rout             UTRS0001                 $90,000
         BSVR Billing Server Optn          BSVR0001                 This is a custom developed package developed for a
                                                                    single customer.  It is not available to other
                                                                    customers. Available for 2 DMS200 sites in PA only
                                                                    in LEC & LET loads.  It is x-coupled in all other
                                                                    PCLs.
         DCR DCR                           DCR00001                 $200,000
         DCR Dual X25 link                 DCR00003                 The fee is $20,000 per Network processor and $3,000
                                                                    per switch.
         DCR Mult. Net. Access             DCR00002                 $56,000
         UCSB UCS Base                     UCSB0001                 $286,700
</TABLE>





<PAGE>   96

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


   
***
    
<PAGE>   97

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1

                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


   
***
    



<PAGE>   98

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1

                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


   
***
    



<PAGE>   99
                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


   
***
    



<PAGE>   100

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                             III. DMS-500 Extensions
                              (DMS-500 Extensions)


   
***
    




<PAGE>   101

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                                IV. RSC-S System

     NORTEL SHALL ENGINEER EACH INITIAL SYSTEM ORDERED HEREUNDER IN ACCORDANCE
     WITH NORTEL'S STANDARD ENGINEERING PRACTICES AND PROCEDURES, AND
     THEREAFTER NORTEL SHALL PROVIDE BUYER WITH A DETAILED LIST OF THE
     COMPONENTS OF  SUCH INITIAL SYSTEM.

     1.0    INITIAL RSC-S (OPTIONAL)

            1.1  THE FOLLOWING REPRESENTS THE SONET REMOTE SWITCHING CENTER
                 EQUIPMENT THAT WILL BE DELIVERED WITH THE INITIAL SYSTEM;

                 - (1) Remote Cluster Controller (RCC2) Shelf
                 - (1) Remote Maintenance Module (RMM) Shelf for Testing,
                   Diagnostics, and Alarms
                 - (1) Line Concentrating Module Enhanced (LCME), 480 Wired /
                   480 Equipped POTS Lines
                 - (1) Host LTCI, 384 Wired / 384 Equipped Ports
                 -   Common equipment including XPM+
                 -   CMR and UTRs
                 -   Sixteen (16) DS-1 C-Side Interfaces
                 - Any required Service/Test Circuits
                 - Any required ENET, MS or processor memory expansions
                   relating to this LTCI
                 - Power Distribution equipment to support the above
                   configuration.
                 - Nortel's standard compliment of one spare per unique circuit
                   pack for the DMS-500 Initial System.

            1.2  INITIAL RSC-S SYSTEM:

                 The price for the Initial RSC-S equipped and wired as
                 described in Section 2.1 above, including host LTCI and the
                 fee for the license of the Software is Two Hundred
                 Thirty-Seven Thousand Dollars ($237,000).


2.0        RSC-S  EXTENSION PRICING

            2.1     RSC-S LINES

                 The price for an RSC-S Line Extension includes the following.
                 The LCM provides line side interface to the RSC-S.  Each RSC-S
                 Line Extension may be purchased in increments as defined
                 below:

                       a)  LCM  Equipment or then current common control.

                       b)  Any required processor memory Extension.

                       c)  Any required RSC-S service/test circuits to support
                           the RSC-S Extension.

                       d)  Power Distribution Center (PDC) equipment as
                           required to support the RSC-S Extension.

                       e)  Spare circuit.





<PAGE>   102

                                                        MGC Communications, Inc.
                                                              Security Agreement
                                                                      Schedule 1


                                IV. RSC-S System




            2.2  RSC-S LINE PRICING

                 RSC-S lines may be purchased at the below listed prices:

<TABLE>
<CAPTION>
                 LINE TYPE                               INITIAL PRICE/LINE           EXTENSION PRICE/LINE
                 ---------                               ------------------           --------------------
                 <S>                                     <C>                          <C>
                 Wired Lines - Non ISDN Frame                   $60                            $ 90
                 Wired Lines - ISDN Frame                       $80                            $120
                 Equipped POTS                                  $26                            $ 39
                 Equipped MBS                                   $59                            $ 89
                 Equipped ISDN BRI Line                         $70                            $105
</TABLE>

             Non ISDN wired frames will be purchased in one thousand two
             hundred eighty (1,280) wired line increments.  ISDN wired
             frames will be purchased in nine hundred sixty (960) wired line
             increments.  POTS and MBS equipped lines will be purchased in
             one hundred (100) line increments.  ISDN BRI equipped lines
             will be purchased in fifty (50) line increments.





<PAGE>   103
                                   Schedule 2

                                Trade Names, Etc.


MGC Communications, Inc.
3165 Palms Centre Drive
Las Vegas, Nevada 89103

NevTEL
3165 Palms Centre Drive
Las Vegas, Nevada 89103




                                       17
<PAGE>   104


                                   Schedule 3

                             Locations of Equipment

<TABLE>
<CAPTION>
================================================================================

                                    EQUIPMENT

================================================================================
            Location                             Name and Address of Landlord of
                                                         Premises (if any)
- --------------------------------------------------------------------------------
<S>                                              <C>
DeKalb County, Toco Hills, Georgia



Fulton County, Atlanta, Georgia


- --------------------------------------------------------------------------------
Cooke County, Des Plains, Illinois



Cooke County, Chicago, Illinois


- --------------------------------------------------------------------------------
Los Angeles County, Pomona,
California




San Bernadino County, Ontario,
California


- --------------------------------------------------------------------------------
Clark County, Las Vegas, Nevada                  Rancho Road Associates II
                                                 Lee W. Phelps, General Partner
                                                 3137 W. Tompkins Ave.
                                                 Las Vegas, Nevada 89103
- --------------------------------------------------------------------------------
</TABLE>


                                       18
<PAGE>   105

                                   Schedule 4

                            Jurisdictions for Filing
                           UCC-1 Financing Statements

<TABLE>
<CAPTION>
<S>    <C>
1.     DeKalb County, Toco Hills, Georgia

2.     Fulton County, Atlanta, Georgia

3.     Cooke County, Des Plains, Illinois

4.     Cooke County, Chicago, Illinois

5.     Los Angeles County, Pomona, California

6.     San Bernadino County, Ontario, California

7.     Clark County, Las Vegas, Nevada
</TABLE>


                                       19
<PAGE>   106
                                                           CONTRACT NO. MGC9701N
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 1

                               PRODUCT ATTACHMENT
                            S/DMS ACCESSNODE PRODUCTS

Northern Telecom Inc. ("Nortel") and MCG ("Buyer") agree as follows:

NOW, THEREFORE Buyer and Nortel agree as follows:

1.       INCORPORATION BY REFERENCE

         This Product Attachment shall be incorporated into and made a part of
         Network Products Purchase Agreement No. MGC9701N ("Agreement") between
         Nortel and Buyer.

2.       DEFINITIONS

         For purposes of this Product Attachment:

         "Equipment" shall mean the equipment listed in Schedule A.

         "Product Attachment Term" shall mean the period which shall commence on
         the date this Product Attachment is executed by the latter of the
         parties and shall expire on December 31, 1999.

         "Services" shall mean the services described in Schedule B.

         "Software" shall mean the software listed in Schedule A.

         "Specifications" shall mean Nortel's standard published performance
         specifications for the Products.

         "Vendor Items" shall mean the equipment marked with an asterisk (*) in
         Schedule A.

         "Warranty Period" shall mean twelve (12) months from the date of
         shipment stamped on the Equipment or, if the date of shipment is not
         marked on the Equipment, fifteen (15) months from the date of
         manufacture. In the event Nortel performs installation Services, the
         Equipment warranty shall be twelve (12) months from the date of
         acceptance as set forth in Section 7 herein.

3.       SCHEDULES

         The following Schedules which are attached hereto are an integral part
         of the Product Attachment and are incorporated herein by reference:

<TABLE>
                  <S>           <C>     
                  Schedule A -  Products, Prices, and Fees
                  Schedule B -  Services and Charges
</TABLE>


<PAGE>   107
                                                           CONTRACT NO. MGC9701N
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 2

<TABLE>
                  <S>           <C>
                  Schedule C -  Delivery Intervals
                  Schedule D -  Forecast
</TABLE>

4.       ORDERING

         4.1      All Orders shall specify the Products required and the
                  Services, Nortel is to perform, if any.

         4.2      Any change to the original Order initiated by Buyer after
                  Nortel's acceptance of the Order and any resulting adjustments
                  to prices, schedule and/or other requirements of the Order
                  shall be negotiated, mutually agreed upon and subsequently
                  detailed in a written change to the Order ("Change Order"),
                  referencing the original Order and executed by authorized
                  representatives of Buyer and Nortel. The adjustment of the
                  Order prices for Products and charges for any Services, as
                  applicable, in a Change Order shall be established on the
                  basis of Nortel's then current merchandise prices for such
                  Products and/or charges for Services. In the event that the
                  Change Order affects work already performed, the adjustment of
                  the Order price shall include reasonable charges incurred by
                  Nortel related to such work. No such changes shall be
                  performed until a Change Order has been executed by Nortel and
                  Buyer as described above.

5.       PRICING

         5.1      Pricing for AccessNode Equipment and Software shall be as set
                  forth in Schedule A, Sections 1 through 7.

         5.2      The prices for engineering, installation and/or system line-up
                  and testing ("SLAT") Services performed by Nortel with respect
                  to an accepted Order shall be as quoted by Nortel and agreed
                  to by Buyer prior to issuance of the applicable Order.

         5.3      Nortel will prepay freight charges and the cost of any
                  insurance requested by Buyer and invoice Buyer for these items
                  at Nortel's actual cost. These charges will appear as separate
                  line items on Nortel's invoice.

         5.4      Buyer and Seller shall, on at least an annual basis, review
                  the pricing for Product set forth in Schedule A to ensure
                  pricing, including any credits granted to Buyer under Section
                  11, is generally in line with competitive market pricing. If
                  Buyer reasonably determines that prices have decreased and
                  adjustments are necessary, then Buyer and Seller shall
                  negotiate in good faith to bring prices to competitive parity.


<PAGE>   108
                                                           CONTRACT NO. MGC9701N
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 3



6.       TERMS OF PAYMENT

         Nortel shall invoice Buyer for the price of the Products as well as any
         prepaid freight and insurance charges upon shipment of the Products.
         Any Services provided hereunder shall be invoiced to Buyer upon
         Nortel's completion of such Services.

7.       TESTING, TURNOVER, AND ACCEPTANCE

         7.1      When Nortel installs the Products, Buyer's acceptance of the
                  Products and Services shall take place, or be deemed to have
                  taken place, upon completion by Nortel of installation and
                  SLAT Services in accordance with Nortel's standard procedures
                  and practices, as evidenced by the acceptance test results
                  showing that the Products meet and perform in accordance with
                  the applicable Specifications. Upon such acceptance, Nortel
                  shall provide Buyer with a turnover notice to be acknowledged
                  in writing by Buyer. By providing the turnover notice, Nortel
                  certifies that the Products meet and perform in accordance
                  with the applicable Specifications. Acceptance of the Products
                  shall not be withheld or postponed due to:

                  a)       deficiencies of the Products or any other product
                           with which such Products are used or operated,
                           resulting from causes not attributable to Nortel,
                           such as but not limited to (i) inaccuracy of
                           information provided by Buyer, (ii) inadequacy or
                           deficiencies of product, facilities or services
                           provided by Buyer or a third party and tested in
                           conjunction with the Products, or (iii) other
                           conditions, external to the Products provided by
                           Nortel, which are beyond limits specified herein and
                           are used by Nortel in performance calculations and
                           spurious outputs from adjacent product. Nortel shall,
                           however, at Buyer's expense, assist Buyer in the
                           elimination or minimization of such deficiencies; or

                  b)       minor deficiencies or shortages, attributable to
                           Nortel, of a nature that do not prevent full and
                           efficient commercial operation of the Products.
                           Nortel shall, however, at its expense, take prompt
                           and effective action to correct any such deficiencies
                           or shortages.

         7.2      The effort associated with Nortel's investigation of any
                  deficiencies not attributable to Nortel shall be billed to
                  Buyer.


<PAGE>   109
                                                           CONTRACT NO. MGC9701N
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 4



8.       WARRANTIES AND REMEDIES

         8.1      The repair or replacement of Equipment and the correction of
                  defective installation Services shall be warranted for a
                  period of ninety (90) days or the remainder of the original
                  Warranty Period whichever is longer.

         8.2      Nortel shall provide Buyer with repair and replacement service
                  for a minimum period of seven (7) years from the commencement
                  date of this Product Attachment, subject to the condition that
                  should Nortel discontinue manufacture or repair of the Product
                  or portions thereof prior to the expiration of such seven (7)
                  year period (such right of discontinuance being expressly
                  reserved by Nortel), Nortel shall provide Buyer with a twelve
                  (12) month prior written notice of any discontinuance so as to
                  enable Buyer to place an order for its requirements or to
                  enter into any other mutually satisfactory agreement with
                  Nortel prior to such discontinuance. This provision shall
                  survive the expiration of this Product Attachment.

9.       NOTICES

         Pursuant to Section 18.5 of the Agreement, any notices by Buyer to
         Nortel which are specific to this Product Attachment shall be delivered
         to the following address:

                  Northern Telecom Inc.
                  5555 Windward Parkway, Suite B
                  Alpharetta, Georgia 30201-3895
                  Attn:   Vice President and General Manager, Access Networks

10.      ADDITIONAL TERMS

         10.1     Nortel may, from time to time, issue updates to the Software
                  and, upon Buyer's payment of applicable Right to Use Fees or
                  Software License Fees, if any, shall license these updates to
                  Buyer. Nortel shall classify such updates as either: 1)
                  Incremental Software Upgrades ("ISUs"), designed to correct
                  any nonconformance to the applicable Software specifications
                  or 2) enhancements which will provide additional features
                  ("Enhancements"). Updates to Software, classified as ISUs by
                  Nortel, will be provided at no cost to Buyer. Notwithstanding
                  the foregoing, ISUs and Enhancements shall not include the
                  cost of any associated hardware that may be required to update
                  such ISUs. Updates classified as Enhancements, which will be
                  used by Buyer in its operations shall be made available to
                  Buyer on a billable basis. In the event Nortel determines that
                  the update includes both ISUs and Enhancements which will be
                  used by Buyer in its operations, such update shall be made
                  available to Buyer. If Buyer elects to receive the update,
                  Nortel shall invoice Buyer only for the amount


<PAGE>   110
                                                           CONTRACT NO. MGC9701N
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 5

                  determined by Nortel to be attributed to the Enhancements
                  contained in such update.

         10.2     In order to allow Nortel to meet its delivery requirements,
                  Buyer shall issue a forecast showing the specific types and
                  quantities of Products to be released and the dates such
                  Products will be released throughout the Product Attachment
                  Term. Buyer shall update such forecasts quarterly with each
                  forecast stating the specific types of Products and quantities
                  of Products to be released during the next quarter. The
                  initial forecast shall be as set forth in Schedule D. In the
                  event Buyer does not meet its obligation to update its
                  forecast quarterly, then Nortel shall not be obligated to meet
                  its forecasted delivery intervals as stated in Schedule C.
                  Nortel's only obligation regarding such delivery intervals
                  shall be to meet delivery dates set forth in an accepted
                  Order. If Nortel, prior to acceptance of an Order, advises
                  Buyer that it cannot meet a delivery date shown in an Order,
                  both parties will negotiate a revised date prior to acceptance
                  of the Order by Nortel. The installation and SLAT intervals
                  applicable to an Order will be quoted by Nortel and agreed to
                  by Buyer and Nortel prior to issuance of such Order.

         10.3     If Nortel is providing Buyer with installation Services, Buyer
                  shall be responsible for having all installation sites ready
                  on time and in accordance with Nortel's requirements. Buyer
                  shall be responsible for any expense incurred by Nortel as a
                  result of Buyer's failure to meet the foregoing obligations.

11.      PURCHASE COMMITMENT

         11.1     During the Product Attachment Term, Buyer commits to purchase
                  and/or license, as applicable, and take delivery from Nortel
                  of seventy-one thousand, six hundred and forty-four (71,644)
                  lines ("Purchase Commitment") of AccessNode Product, based on
                  the models set forth in Schedule A, Sections 1A through 1D.
                  The five thousand, seven hundred eighty-eight (5,788) lines
                  purchased by NevTel, Inc. under Contract No. NT0596JRD shall
                  count toward Buyer's fulfillment of the Purchase Commitment
                  under this Product Attachment.

         11.2     In consideration of Buyer's Purchase Commitment above, Nortel
                  shall provide Buyer a credit in an amount not to exceed One
                  Hundred Forty Thousand Dollars ($140,000.00). Such credit
                  shall be applied only against the first and last Orders
                  submitted by Buyer toward Buyer's Purchase Commitment, and
                  provided such Orders shall be for the purchase of at least
                  seven (7) AccessNode models as set forth in Schedule A,
                  Sections 1A through 1D. Such credit shall be in increments of
                  Ten Thousand Dollars ($10,000.00) per AccessNode model.
<PAGE>   111
                                                           CONTRACT NO. MGC9701N
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 6


         11.3     In the event Buyer fails to purchase and/or license, as
                  applicable, and take delivery of its Purchase Commitment, as
                  set forth in Section 11.1, by the end of the Product
                  Attachment Term, Nortel shall invoice Buyer a fee based on ten
                  percent (10%) of the product of (i) the difference between
                  Purchase Commitment and the actual number of lines purchased;
                  (ii) the per line price of One Hundred and Sixty Dollars
                  ($160.00).

         11.4     Nortel has also provided Buyer special pricing on seventeen
                  (17) DS-1 Fed AccessNodes ("DFAs"), as provided in Proposal
                  No. P70171, and purchased by Buyer under Order No. ______.
                  Such DFA purchases shall count toward Buyer's fulfillment of
                  the Purchase Commitment but shall not be eligible for the
                  credit set forth in Section 11.3 above.


NORTHERN TELECOM INC.                      MGC COMMUNICATIONS, INC.

By:                                        By: 
   ----------------------------------         ---------------------------------
               Signature                                   Signature

Name:                                      Name: 
     --------------------------------           -------------------------------
                 Print                                        Print

Title:                                     Title: 
      -------------------------------            ------------------------------

Date:                                      Date: 
     --------------------------------           -------------------------------


<PAGE>   1
                                                                   EXHIBIT 10.11
- --------------------------------------------------------------------------------





                          SECURITIES PURCHASE AGREEMENT

                                      AMONG


                            MGC COMMUNICATIONS, INC.

                                       AND


                            THE PURCHASERS LISTED ON
                                SCHEDULE 1 HERETO

                          Dated as of November 26, 1997







- --------------------------------------------------------------------------------




<PAGE>   2


                                TABLE OF CONTENTS


<TABLE>
<S>                                                                                                              <C>
1. Sale and Purchase of Shares................................................................................... 1
         1.1  Sale and Purchase of Shares........................................................................ 1

2. Purchase Price................................................................................................ 1
         2.1  Amount of Purchase Price........................................................................... 1
         2.2  Payment of the Purchase Price...................................................................... 1

3. Closing; Termination of Agreement............................................................................. 1
         3.1  Closing Date....................................................................................... 1

4. Representations and Warranties of the Company................................................................. 2
         4.1  Organization and Good Standing..................................................................... 2
         4.2  Authorization of Agreement; Enforceability......................................................... 2
         4.3  Subsidiaries....................................................................................... 3
         4.4  Consents of Third Parties.......................................................................... 3
         4.5  Authorization of Preferred Shares and Reserved Shares.............................................. 3
         4.6  Financial Statements............................................................................... 3
         4.7  No Undisclosed Liabilities......................................................................... 4
         4.8  Absence of Certain Developments.................................................................... 4
         4.9  Taxes.............................................................................................. 6
         4.10 Real Property...................................................................................... 6
         4.11 Tangible Personal Property......................................................................... 7
         4.12 Intangible Property................................................................................ 8
         4.13 Material Contracts.................................................................................10
         4.14 Employee Benefits..................................................................................10
         4.15 Employees..........................................................................................12
         4.16 Litigation.........................................................................................12
         4.17 Compliance with Laws; Permits......................................................................12
         4.18 Environmental Matters..............................................................................13
         4.19 Investment Company Act.............................................................................14
         4.20 Transactions with Affiliates.......................................................................14
         4.21 Disclosure.........................................................................................14
         4.22 Financial Advisors.................................................................................14
         4.23 Insurance..........................................................................................14
         4.24 Dissolution of Previous Entities...................................................................14
         4.26 Improper Actions...................................................................................15

5. Representations and Warranties of the Purchasers..............................................................15
         5.1  Organization and Good Standing.....................................................................15
         5.2  Authorization of Agreement.........................................................................15
         5.3  Purchaser Representation...........................................................................15
         5.4  Investment Intention...............................................................................15
</TABLE>


                                       i
<PAGE>   3

<TABLE>
<S>                                                                                                              <C>
         5.5 Financial Advisors..................................................................................16

6. Further Agreements of the Parties.............................................................................16
         6.1  Covenants..........................................................................................17
         6.3  Use of Proceeds....................................................................................17
         6.3  Access to Information..............................................................................17
         6.4  Confidentiality....................................................................................17
         6.5  Other Actions......................................................................................17
         6.7  Indemnity..........................................................................................17
         6.9  U.S. Real Property Holding Corporation.............................................................18
         6.10 Financial Statements, Reports, Etc.................................................................18

7. Documents to be Delivered at the Closing......................................................................19
         7.1  Documents to be Delivered by the Company...........................................................19
         7.2  Delivery of Purchase Price.........................................................................20

8. Miscellaneous.................................................................................................20
         8.1  Certain Definitions................................................................................20
         8.2  Tax Treatment of Preferred Stock...................................................................24
         8.3  Expenses...........................................................................................24
         8.4  Specific Performance...............................................................................25
         8.5  Further Assurances.................................................................................25
         8.6  Submission to Jurisdiction; Consent to Service of Process..........................................25
         8.7  Entire Agreement; Amendments and Waivers...........................................................25
         8.8  Governing Law......................................................................................26
         8.9  Table of Contents; Headings; Interpretive Matters..................................................26
         8.10 Notices............................................................................................26
         8.11 Severability.......................................................................................27
         8.12 Binding Effect; Assignment.........................................................................27
         8.13 Counterparts.......................................................................................27
</TABLE>


                                       ii
<PAGE>   4


                          SECURITIES PURCHASE AGREEMENT


         SECURITIES PURCHASE AGREEMENT, dated as of November 26, 1997 (this
"Agreement"), among MGC Communications, Inc., a Nevada corporation (the
"Company"), and the Purchasers listed on Schedule 1 (the "Purchasers").


                              W I T N E S S E T H:

         WHEREAS, the Company desires to issue to each Purchaser, and each
Purchaser desires to purchase from the Company, the Shares (as such term is
defined below) in such amounts as set forth next to such Purchaser on Schedule
1, and

         WHEREAS, certain terms used in this Agreement are defined in Section
8.1 hereof;

         NOW, THEREFORE, in consideration of the promises and mutual covenants
and agreements hereinafter contained, the parties hereto hereby agree as
follows:

      1. SALE AND PURCHASE OF SHARES.

         1.1. Sale and Purchase of Shares. Subject to the terms and conditions
of this Agreement, on the Closing Date (as defined in Section 3.1 hereof) the
Company shall sell, assign, transfer, convey and deliver to each Purchaser, and
each Purchaser shall purchase from the Company the number of shares of Series A
Convertible Preferred Stock, par value $.001 per share (the "Series A Preferred
Stock") listed next to such Purchaser on Schedule 1 (the "Shares"), for the
Purchase Price (as defined in Section 2.1 below) and upon the terms and
conditions hereinafter set forth.

      2. PURCHASE PRICE.

         2.1. Amount of Purchase Price. The purchase price for the Shares shall
be as indicated on Schedule 1 (the "Purchase Price"). The Purchase Price shall
be payable as provided in Section 2.2 hereof.

         2.2. Payment of the Purchase Price.. At the Closing, the Purchasers
shall pay the Purchase Price by wire transfer of clearinghouse funds or by such
other method as may be reasonably acceptable to the Company and the Purchasers
to such account of the Company as shall have been designated in advance to the
Purchasers by the Company.

      3. CLOSING; TERMINATION OF AGREEMENT.

         3.1. Closing Date. The closing of the sale and purchase of the Shares
provided for in Section 1.1 (the "Closing") shall take place at 9:00 a.m. at the
offices of Akin, Gump, 

                                       1
<PAGE>   5

Strauss, Hauer & Feld, L.L.P. in New York, New York (or at such other place as
the parties hereto may mutually agree) on the date hereof, or on such other date
as the parties hereto may mutually agree. The date on which the Closing is held
is referred to in this Agreement as the "Closing Date." At the Closing, the
parties shall execute and deliver the documents referred to in Section 7 hereof.

      4. REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company represents
and warrants to each Purchaser that:

         4.1.Organization and Good Standing. (a) The Company is duly organized,
validly existing and in good standing under the laws of the State of Nevada and
has full corporate power and authority to own, lease and operate its properties
and assets and to carry on its business as now conducted and as it is proposed
to be conducted. The Company is duly qualified or authorized to do business as a
foreign corporation and is in good standing under the laws of each jurisdiction
in which the conduct of its business or the ownership of its properties or
assets requires such qualification or authorization, except for those
jurisdictions where the failure to be so qualified would not, individually or in
the aggregate, have or result in a material adverse effect on the business,
properties, results of operations, prospects or conditions (financial or
otherwise) of the Company.

         (b) The authorized capital stock of the Company is as set forth on
Schedule 4.1(b). Except as disclosed on Schedule 4.1(b), there is no existing
option, warrant, call, right, commitment or other agreement of any character to
which the Company is a party requiring, and there are no securities of the
Company outstanding which upon conversion or exchange would require, the
issuance, sale or transfer of any additional shares of capital stock or other
equity securities of the Company or other securities convertible into,
exchangeable for or evidencing the right to subscribe for or purchase shares of
capital stock or other equity securities of the Company. Except as disclosed on
Schedule 4.1(b), the Company is not a party to, nor aware of, any voting trust
or other voting agreement with respect to any of the securities the Company or
to any agreement relating to the issuance, sale, redemption, transfer or other
disposition of the capital stock of the Company.

         4.2. Authorization of Agreement; Enforceability. The Company has all
requisite corporate power and authority to execute and deliver this Agreement
and each other agreement, document, instrument or certificate contemplated by
this Agreement or to be executed by the Company in connection with the
consummation of the transactions contemplated by this Agreement (the
"Transaction Documents"), and to perform fully its obligations hereunder and
thereunder. The execution, delivery and performance by the Company of this
Agreement and the Transaction Documents have been duly authorized by all
necessary corporate action on the part of the Company and its shareholders. This
Agreement and each of the Transaction Documents have been duly and validly
executed and delivered by the Company and (assuming the due authorization,
execution and delivery thereof by each Purchaser) this Agreement and each of the
Transaction Documents constitutes the legal, valid and binding obligations of
the Company, enforceable against the Company in accordance with their respective
terms, subject to applicable bankruptcy, insolvency, reorganization, moratorium
and similar laws affecting 



                                       2
<PAGE>   6

creditors' rights and remedies generally and subject, as to enforceability, to
general principles of equity (regardless of whether enforcement is sought in a
proceeding at law or in equity).

         4.3. Subsidiaries. The Company has no Subsidiaries.

         4.4. Consents of Third Parties. None of the execution and delivery by
the Company of this Agreement and the Transaction Documents, the consummation of
the transactions contemplated hereby or thereby, or compliance by the Company
with any of the provisions hereof or thereof will (a) conflict with, or result
in the breach of, any provision of the articles of incorporation or by-laws of
the Company; (b) conflict with, violate, result in the breach or termination of,
or constitute a default or give rise to any right of termination or acceleration
or right to increase the obligations or otherwise modify the terms thereof under
any Contract, Permit or Order to which the Company is a party or by which the
Company or any of its properties or assets is bound (except for the antidilution
protection granted to certain existing warrantholders for issuances of
securities below $5.00 per share, which warrants were issued in connection with
the issuance of Senior Notes); (c) constitute a violation of any Law applicable
to the Company, or (d) result in the creation of any Lien upon the properties or
assets of the Company, other than, in the case of clauses (b), (c) and (d), any
such conflict, violation, breach, termination, acceleration or other event
which, individually or in the aggregate, could not reasonably be expected to
cause a Material Adverse Change. Other than those which have been obtained or
made, no consent, waiver, approval, Order, Permit or authorization of, or
declaration or filing with, or notification to, any Person or Governmental Body
is required on the part of the Company in connection with the execution and
delivery of this Agreement or the Transaction Documents, or the compliance by
the Company with any of the provisions hereof or thereof.

         4.5. Authorization of Preferred Shares. The issuance, sale, and
delivery of the Shares have been duly authorized by all requisite action of the
Company, and, when issued, sold, and delivered in accordance with this
Agreement, the Shares, and the Common Stock delivered upon conversion of the
Shares will be validly issued and outstanding, fully paid, and non-assessable,
with no personal liability attaching to the ownership thereof, and, except as
may be set forth in the Stockholders Agreement, not subject to preemptive or any
other similar rights of the shareholders of the Company or others.

         4.6. Financial Statements. The Company has provided prior to the
Closing Date (a) copies of the unaudited consolidated balance sheets of the
Company as of September 30, 1997 and the related unaudited consolidated
statements of income and cash flows for the quarter then ended (the "Unaudited
Financial Statements") and (b) the audited consolidated balance sheets of the
Company as of December 31, 1996 and the related consolidated statements of
income and cash flows for such year ended (such statements, including the
related notes and schedules thereto, and the Unaudited Financial Statements, are
referred to herein as the "Financial Statements"). Each of the Financial
Statements was prepared in good faith by the Company, is complete and correct in
all material respects, has been prepared in accordance with GAAP and in
conformity with the practices consistently applied by the Company and presents
fairly the consolidated financial position, results of operations and cash flows
of the Company as 



                                       3
<PAGE>   7

of the dates and for the periods indicated, except, with respect to the
Unaudited Financial Statements, for the absence of footnotes and year end
adjustments.

         4.7. No Undisclosed Liabilities. Except as set forth on Schedule 4.7,
the Company has no liabilities (whether accrued, absolute, contingent or
otherwise, and whether due or to become due or asserted or unasserted), except
(a) obligations under Contracts described in Schedule 4.13 or under Contracts
that are not required to be disclosed thereon as a result of dollar thresholds
therein; (b) liabilities provided for in the Unaudited Financial Statements; (c)
liabilities (other than accounts payable) incurred since the Unaudited Financial
Statements, in the ordinary course of business, the sum of which is, in the
aggregate, no greater than $500,000; and (d) accounts payable in excess of those
shown on the Unaudited Financial Statements, incurred in the ordinary course of
business, the sum of which is, in the aggregate, not greater than $500,000.
Unless specifically disclosed as a breach on Schedule 4.7, disclosure of a
Contract on Schedule 4.13 shall not be indicative of a breach of any provision
of such Contract.

         4.8. Absence of Certain Developments.

         (a) Except as set forth in Schedule 4.8(a) the general nature of the
business of the Company (the "Business") is described in the Offering Memorandum
with respect to the Company's issuance of $160,000,000 of 13% Senior Secured
Notes due 2004 (and related warrants) dated September 24, 1997 (to the extent
not superceded by the Prospectus contained in the Registration Statement on Form
S-4 filed with the Securities and Exchange Commission on October 28, 1997 (the
"Registration Statement")) and the Registration Statement (collectively, the
"Offering Memorandum"), which previously has been delivered to the Purchasers.

         (b) Except as set forth in Schedule 4.8(b) and since the date of the
Unaudited Financial Statements:

                  (i)   there has not been any Material Adverse Change nor has
any event occurred which could reasonably be expected to result in any Material
Adverse Change; or

                  (ii)  there has not been any damage, destruction or loss,
whether or not covered by insurance, with respect to the property and assets of
the Company having a replacement cost of more than $100,000 for any single loss
or $500,000 for all such losses;

                  (iii) there has not been any declaration, setting a record
date, setting aside or authorizing the payment of, any dividend or other
distribution in respect of any shares of capital stock of the Company or any
repurchase, redemption or other acquisition by the Company, of any of the
outstanding shares of capital stock or other securities of, or other ownership
interest in, the Company;

                  (iv)  except for grants of ___ shares under the Company's 
stock option plan, there has not been any transfer, issue, sale or other
disposition by the Company of any shares of capital stock or other securities
of the Company or any grant of options, warrants, 



                                       4
<PAGE>   8

calls or other rights to purchase or otherwise acquire shares of such capital
stock or such other securities;

                  (v)    except with respect to the hiring of new Employees in
the ordinary course of business whose annual compensation in the aggregate is
not greater than $500,000 (exclusive of benefits), the Company has not awarded
or paid any bonuses to Employees of the Company nor has the Company entered into
any employment, deferred compensation, severance or similar agreements (nor
amended any such agreement) or agreed to increase the compensation payable or to
become payable by it to any of the Company's directors, officers, Employees,
agents or Representatives or agreed to increase the coverage or benefits
available under any severance pay, termination pay, vacation pay, company
awards, salary continuation for disability, sick leave, deferred compensation,
bonus or other incentive compensation, insurance, pension or other employee
benefit plan, payment or arrangement made to, for or with such directors,
officers, Employees, agents or Representatives, other than in the ordinary
course of business consistent with past practice which increases in the
aggregate do not exceed $100,000 in annual cost to the Company, and other than
as may have been required by law or insurers;

                  (vi)   the Company has not made any loans, advances or capital
contributions to, or investments in, any Person or paid any fees or expenses to
any Affiliate of the Company, other than for reimbursement of expenses in the
ordinary course of business consistent with past practices;

                  (vii)  except for Liens with respect to the Senior Notes, the
Company has not mortgaged, pledged or subjected to any Lien any of its assets,
or acquired any assets or sold, assigned, transferred, conveyed, leased or
otherwise disposed of any assets, except for assets acquired or sold, assigned,
transferred, conveyed, leased or otherwise disposed of in the ordinary course of
business consistent with past practice;

                  (viii) the Company has not discharged or satisfied any Lien,
or paid any obligation or liability (fixed or contingent), except in the
ordinary course of business consistent with past practice and which, in the
aggregate, would not be material to the Company;

                  (ix)   the Company has not canceled or compromised any debt or
claim or amended, canceled, terminated, relinquished, waived or released any
Contract or right except in the ordinary course of business consistent with past
practice and which, in the aggregate, would not be material to the Company;

                  (x)    the Company has not transferred or granted any rights
under any contracts, leases, licenses, agreements or Intangible Property (as
defined in Section 4.12 hereof) used by the Company in its business which
reasonably could be expected to result in a Material Adverse Change; and

                  (xi)   the Company has not made any binding commitment to make
any capital expenditures or capital additions or betterments in excess of
$500,000 in the aggregate.



                                       5
<PAGE>   9

         4.9. Taxes.

         (a) The amount, if any, shown on the Unaudited Financial Statements, as
provision for Taxes is sufficient for payment of all accrued and unpaid federal,
state, county, local and foreign Taxes for the period then ended and all prior
periods.

         (b) The Company has filed all Tax Returns (federal, state, county,
local and foreign) required to be filed by it and all such returns are true and
correct in all material respects. All Taxes shown to be due and payable on such
returns, any assessments imposed, and to the Company's knowledge all other Taxes
due and payable by the Company on or before the Closing have been paid or will
be paid prior to the time they become delinquent, other than those being
contested in good faith and listed on Schedule 4.9(b).

         (c) Federal Income Tax Returns of the Company have not been audited by
the Internal Revenue Service, and no controversy with respect to Taxes of any
type is pending or, to the best of the Company's knowledge, threatened.

         (d) Neither the Company nor any of its stockholders has ever filed (i)
an election pursuant to Section 1362 of the Code that the Company be taxed as an
S Corporation or (ii) consent pursuant to Section 341(f) of the Code relating to
collapsible corporations.

         (e) Except as set forth on Schedule 4.9(e), the Company's net operating
losses, if any, for federal income tax purposes, as set forth in the Financial
Statements, are not subject to any limitations imposed by Section 382 of the
Code, and consummation of the transactions contemplated by this Agreement or by
any other agreement, understanding or commitment, contingent or otherwise, to
which the Company is a party or by which it is otherwise bound will not have the
effect of limiting the Company's ability to use such net operating losses in
full to offset such taxable income.

         (f) The Company has not waived any statute of limitation in respect of
Taxes or agreed to any extension of time with respect to a Tax assessment or
deficiency.

         (g) The Company is not a party to any Income Tax allocation or sharing
agreement.

         (h) The Company is not and has never been a member of an Affiliated
Group filing a consolidated Federal Income Tax Return (other than a group the
common parent of which was the Company).

         (i) The Company is not a "United States real property holding
corporation" within the meaning of Section 847(c)(2) of the Internal Revenue
Code of 1986, as amended.

         4.10 Real Property.

         (a) The Company does not own any real property other than as set forth
on Schedule 4.10(a).



                                       6
<PAGE>   10

         (b) Except as set forth on Schedule 4.10(b), the Company has good,
legal, and marketable title to all of its assets, including all properties and
assets free and clear of all Liens, except those assets disposed of since the
date of the Unaudited Financial Statement in the ordinary course of business and
except for Liens incurred with respect to the Senior Notes and Liens incurred in
the ordinary course of business which would not impair the Company's use of such
property in any material way.

         (c) Schedule 4.10(c) sets forth a complete list of all real property
and interests in real property leased by the Company (each a "Real Property
Lease", and collectively, the Real Property Leases) as lessee or lessor. The
Company has good and marketable title to the leasehold estates in all Real
Property Leases in each case free and clear of all Liens, except for Liens
incurred with respect to the Senior Notes and Liens incurred in the ordinary
course of business which would not impair the Company's use of such property in
any material way. The Company has no reason to believe that such title would not
be insurable subject to customary exceptions.

         (d) Each of the Real Property Leases is valid and enforceable in
accordance with its terms, subject to applicable bankruptcy, insolvency,
reorganization, moratorium and similar laws affecting creditors' rights and
remedies generally and subject, as to enforceability, to general principles of
equity (regardless of whether enforcement is sought in a proceeding at law or in
equity), and there is no material default under any Real Property Lease by the
Company or, to the best knowledge of the Company, by any other party thereto,
and no event has occurred that with the lapse of time or the giving of notice or
both would constitute a material default thereunder. The Company has made
available to each Purchaser true, correct and complete copies of the Real
Property Leases, together with all amendments, modifications, supplements or
side letters affecting the obligations of any party thereunder.

         (e) No previous or current party to any Real Property Lease has given
notice of or made a claim with respect to any breach or default thereunder. With
respect to those Real Property Leases that were assigned or subleased to the
Company by a third party, all necessary consents to such assignments or
subleases have been obtained.

         4.11 Tangible Personal Property.

         (a) Schedule 4.11(a) sets forth all leases of personal property
("Personal Property Leases") involving annual payments in excess of [$50,000]
relating to personal property used in the business of the Company or to which
the Company is a party or by which the Company or any of its respective
properties or assets is bound. The Company has made available to each Purchaser
true, correct and complete copies of the Personal Property Leases, together with
all amendments, modifications, supplements or side letters affecting the
obligations of any party thereunder.

         (b) (i) Each of the Personal Property Leases is in full force and
effect and is valid, binding and enforceable in accordance with its terms,
subject to applicable bankruptcy, insolvency, reorganization, moratorium and
similar laws affecting creditors' rights and remedies generally and subject, as
to enforceability, to general principles of equity (regardless of whether



                                       7
<PAGE>   11

enforcement is sought in a proceeding at law or in equity), and there is no
material default under any Personal Property Lease by the Company or, to the
best knowledge of the Company, by any other party thereto, and no event has
occurred that with the lapse of time or the giving of notice or both would
constitute a material default thereunder; and

                  (ii) No previous or current party to any such Personal
Property Lease has given notice of or made a claim with respect to any breach or
default thereunder.

         (c) With respect to those Personal Property Leases that were assigned
or subleased to the Company by a third party, all necessary consents to such
assignments or subleases have been obtained.

         (d) The Company has good, legal and marketable title to all of the
material items of tangible personal property used by it (except as sold or
disposed of subsequent to the date hereof in the ordinary course of business
consistent with past practice), free and clear of any and all Liens, except for
Liens incurred with respect to the Senior Notes and Liens incurred in the
ordinary course of business which would not impair the Company's use of such
property in any material way. All such items of tangible personal property
which, individually or in the aggregate, are material to the operation of the
business of the Company are suitable for the purposes used for the operation of
the business of the Company.

         4.12 Intangible Property.

         (a) "Proprietary Rights" shall mean any and all of the following which
have been or are used and/or owned by, and/or issued or licensed to the Company,
along with all income, royalties, damages and payments due or payable at the
Closing or thereafter, including, without limitation, damages and payments for
past, present or future infringements or misappropriations thereof, the right to
sue and recover for past infringements or misappropriations thereof and any and
all corresponding rights that, now or hereafter, may be secured throughout the
world: patents, patent applications, patent disclosures and inventions (whether
or not patentable and whether or not reduced to practice) and any reissue,
continuation, continuation-in-part, division, revision, extension or
reexamination thereof; utility model registrations and applications; design
registrations and applications; trademarks, service marks, trade dress, logos,
trade names and corporate names together with all goodwill associated therewith,
copyrights registered or unregistered and copyrightable works; mask works; and
all registrations, applications, and renewals for any of the foregoing; trade
secrets and confidential information (including without limitation, ideas,
formulae, compositions, know-how, manufacturing and production processes and
techniques, research and developmental information, drawings, specifications,
designs, plans, proposals, technical data, financial, business and marketing
plans, and customer and supplier lists and related information); computer
software and software systems (including, without limitation, data, databases,
object code, source code, microcode and firmware and related documentation);
other proprietary and intellectual property rights; licenses or other agreements
including but not limited to those assigning, waiving or relating to rights of
publicity, moral rights or neighboring rights to or from third parties; and all
copies and tangible embodiments of the foregoing (in whatever form or medium),



                                       8
<PAGE>   12

in each case including, without limitation, the items set forth on the Schedule
4.12(b) attached hereto.

         (b) Schedule 4.12(b) sets forth a complete and correct list of: (i) all
patents, trademark and servicemark registrations, copyright registrations and
other registered Proprietary Rights as well as all pending applications
therefor; (ii) all corporate names, trade names and unregistered trademarks used
by the Company (to the extent not reflected on other schedules attached hereto)
as their own marks; (iii) all material unregistered copyrightable works
authorized by the Company, mask works, and material computer software owned or
licensed by the Company (other than commercial software products generally
available to consumers); and (iv) all material licenses or similar agreements to
which the Company is or just prior to closing was a party either as licensee or
licensor for the Proprietary Rights, in each case identifying the subject
Proprietary Rights.

         (c) Except as set forth on Schedule 4.12(c), (i) the Company owns and
possess all right, title and interest, free and clear of all Liens, in and to,
and to the best knowledge of the Company has a valid and enforceable right to,
each of the Proprietary Rights as described on Schedule 4.12(b), and no claim by
any third party contesting the validity, enforceability, use or ownership of any
of the Proprietary Rights has been made, is currently outstanding or, to the
best knowledge of the Company, is threatened, except for those which could not
reasonably be expected, individually or in the aggregate, to cause a Material
Adverse Change; (ii) the Proprietary Rights comprise all material intellectual
property rights which are currently being used by the Company or which are
necessary for the operation business as currently conducted by the Company, and
as currently proposed to be conducted; (iii) no loss or expiration of any
Proprietary Right or related group of Proprietary Rights is, to the Company's
knowledge, threatened, or is pending or reasonably foreseeable, except for those
which could not reasonably be expected, individually or in the aggregate, to
cause a Material Adverse Change; (iv) the Company has not received any notices
of, nor is the Company aware of any facts which indicate a likelihood of any
infringement or misappropriation by, or conflict with, any third party with
respect to any of the Proprietary Rights including, without limitation, any
demand or request by the Company that such third party license any of the
Proprietary Rights from the Company or to the Company; (v) to the best of the
Company's knowledge, the Company has not infringed, misappropriated or otherwise
conflicted with any rights, including intellectual property rights, of any third
parties, and the Company is not aware of any infringement, misappropriation or
conflict by the Company of any third-party patent, trademark, copyright or other
intellectual property right, or of any such infringement, misappropriation or
conflict which shall occur as a result of the continued operation of the
business by the Company, as currently conducted or as currently proposed to be
conducted, and there is no demand or request from a third party that the Company
take a license under any intellectual property right; and (vi) none of the
Proprietary Rights owned by or licensed to the Company are, to the best
knowledge of the Company, being infringed, misappropriated or conflicted by any
third party.

         (d) All of the Proprietary Rights are owned by, or properly assigned or
licensed to, the Company or use thereof is otherwise authorized, except to the
extent that the failure to be so owned, assigned, licensed or otherwise
authorized could not reasonably be 



                                       9
<PAGE>   13


expected to, individually or in the aggregate, cause a Material Adverse Change.
The Company has not disclosed, or is aware of any disclosure by any other Person
of any of its trade secrets or confidential information to any third party other
than pursuant to a written confidentiality agreement or disclosure to the
Company's shareholders.

         4.13 Material Contracts.

         (a) Except as set forth on Schedule 4.13(a), neither the Company nor
any of its respective properties or assets is a party to or bound by any (i)
Contract not made in the ordinary course of business, or involving a commitment
or payment in excess of $500,000 or otherwise material to the business of the
Company; (ii) employment, consulting, non-competition, severance, "golden
parachute" or indemnification Contract involving, individually or in the
aggregate, annual payments of more than $250,000 (including, without limitation,
in each case any Contract to which the Company is a party involving Employees of
the Company); (iii) Contract among shareholders or granting a right of first
refusal or for a partnership or a joint venture or for the acquisition, sale or
lease of any assets (except in the ordinary course of business) or capital stock
of the Company or any other Person or involving a sharing of profits; (iv)
mortgage, pledge, conditional sales contract, security agreement, factoring
agreement or other similar Contract with respect to any real or tangible
personal property of the Company; (v) loan agreement, credit agreement,
promissory note, guarantee, subordination agreement, letter of credit or any
other similar type of Contract; (vi) Contract with any Governmental Body; (vii)
Contract with respect to the discharge, storage or removal of Hazardous
Materials; or (viii) binding commitment or agreement to enter into any of the
foregoing. The Company has delivered or otherwise made available to each
Purchaser true, correct and complete copies of the Contracts listed on Schedule
4.13(a) (except as noted thereon), together with all amendments, modifications,
supplements or side letters affecting the obligations of any party thereunder.

         (b) (i) Each of the Contracts listed on Schedule 4.13(a) is valid and
enforceable in accordance with its terms, subject to applicable bankruptcy,
insolvency, reorganization, moratorium and similar laws affecting creditors'
rights and remedies generally and subject, as to enforceability, to general
principles of equity (regardless of whether enforcement is sought in a
proceeding at law or in equity), and there is no material default under any
Contract listed on Schedule 4.13(a) by the Company or, to the best knowledge of
the Company, by any other party thereto, and no event has occurred that with the
lapse of time or the giving of notice or both would constitute a material
default thereunder.

         (ii) No previous or current party to any Contract has given notice to
the Company of or made a claim with respect to any breach or default thereunder
and the Company is not aware of any notice of or claim to any such breach or
default.

         (c) With respect to the Contracts listed on Schedule 4.13(a) that were
assigned to the Company by a third party, all necessary consents to such
assignment have been obtained.



                                       10
<PAGE>   14

         4.14 Employee Benefits.

         (a) The Company has not made contributions to any pension, defined
benefit, or defined contribution plans for its Employees which are subject to
ERISA.

         (b) Set forth on Schedule 4.14(b) is a true and complete list of each
Company Benefit Plan and each Employee Agreement providing for annual
compensation in excess of $100,000. Except as set forth on Schedule 4.14(b), the
Company does not have any plan or commitment, whether legally binding or not, to
establish any new Company Benefit Plan, to enter into any Employee Agreement or
to modify or to terminate any Company Benefit Plan or Employee Agreement (except
to the extent required by law or to conform any such Company Benefit Plan or
Employee Agreement to the requirements of any applicable law, in each case as
previously disclosed to the Purchasers, or as required by this Agreement), nor
has any intention to do any of the foregoing been communicated to Employees.

         (c) Except as set forth on Schedule 4.14(c), (i) the Company does not
maintain or contribute to any Company Benefit Plan which provides, or has any
liability to provide, life insurance, medical, severance or other employee
welfare benefits to any Employee upon his retirement or termination of
employment, except as may be required by Section 4980B of the code; and (ii) the
Company has never represented, promised or contracted (whether in oral or
written form) to any Employee (either individually or to Employees as a group)
that such Employee(s) would be provided with life insurance, medical, severance
or other employee welfare benefits upon their retirement or termination of
employment, except to the extent required by Section 4980B of the Code.

         (d) The Company (i) is in compliance with all applicable federal, state
and local laws, rules and regulations (domestic and foreign) respecting
employment, employment practices, labor, terms and conditions of employment and
wages and hours, in each case, with respect to Employees, except where the
failure to be in such compliance could not reasonably be expected, individually
or in the aggregate, to cause a Material Adverse Change; (ii) has withheld all
amounts required by law or by agreement to be withheld from the wages, salaries
and other payments to Employees; (iii) is not liable for any arrears of wages or
any taxes or any penalty for failure to comply with any of the foregoing; and
(iv) is not liable for any payment to any trust or other fund or to any
governmental or administrative authority, with respect to unemployment
compensation benefits, social security or other benefits for Employees.

         (e) No work stoppage or labor strike against the Company by Employees
is pending or, to the best knowledge of the Company, threatened. The Company (i)
is not involved in or, to the best knowledge of the Company, threatened with any
significant labor dispute, grievance, or litigation relating to labor matters
involving any Employees, including, without limitation, violation of any
federal, state or local labor, safety or employment laws (domestic of foreign),
charges of significant unfair labor practices or discrimination complaints; (ii)
has not engaged in any unfair labor practices within the meaning of the National
Labor Relations Act or the Railway Labor Act which would cause a Material
Adverse Change ; or (iii) is not presently, nor has been in the past a party to,
or bound by, any collective bargaining agreement or union 




                                       11
<PAGE>   15

contract with respect to Employees and no such agreement or contract is
currently being negotiated by the Company or any of its affiliates. No Employees
are currently represented by any labor union for purposes of collective
bargaining and, to the best knowledge of the Company, no activities the purpose
of which is to achieve such representation of all or some of such Employees are
ongoing or threatened.

         (f) Except as set forth on Schedule 4.14(f), no benefits shall accrue,
become payable vest or accelerate as a result of the Transaction under any
Company Benefit Plan or Employee Agreement, including, but not limited to, the
vesting of benefits under any "employee benefit plan" within the meaning of
Section 3(3) of ERISA, the acceleration of stock or stock-related awards, or the
payment of any amount under any Employee Agreement or Company Benefit Plan.

         4.15 Employees.

         Except as set forth on Schedule 4.15, to the best knowledge of the
Company, no key executive Employee and no group of Employees or independent
contractors of the Company has any plans to terminate his, her or its employment
or relationship as an Employee or independent contractor with the Company.

         4.16 Litigation.

         There are no Legal Proceedings pending or, to the best knowledge of the
Company, threatened that question the validity of this Agreement or the
Transaction Documents or any action taken or to be taken by the Company in
connection with the consummation of the transactions contemplated hereby or
thereby. Schedule 4.16 sets forth a true, correct and complete list of all Legal
Proceedings pending or, to the best knowledge of the Company, threatened against
or affecting the Company or any of its properties or assets (including Company
Benefit Plans) of the Company, at law or in equity, and, to the best knowledge
of the Company, there is no reasonable basis for any other such Legal
Proceeding. There is no outstanding or, to the best knowledge of the Company,
threatened Order of any Governmental Body against, affecting or naming the
Company or affecting any of its properties or assets.

         4.17 Compliance with Laws; Permits.

         (a) The Company is and at all times has been in compliance with all
Laws and Orders promulgated by any Governmental Body applicable to the Company
or to the conduct of the business or operations of the Company or the use of its
properties (including any leased properties) and assets, except where the
failure to be in such compliance could not reasonably be expected, individually
or in the aggregate, to cause a Material Adverse Change. The Company has not
received or knows of the issuance of, any notices of violation or alleged
violation of any such Law or Order by any Governmental Body.

         (b) The Company has or is in the process of obtaining all Permits
necessary for the conduct of its business as currently conducted, except where
the failure to obtain a Permit could not reasonably be expected, individually or
in the aggregate, to cause a Material Adverse 



                                       12
<PAGE>   16

Change. Schedule 4.17(b) lists all material Permits of the Company obtained (or
for which applications have been made for) from all Governmental Bodies,
indicating, in each case, the expiration date thereof, which are required by the
nature of the operations of the Company to permit the operation thereof in the
manner in which they are currently conducted. Such Permits have been issued
pursuant to valid applications by the Company to the appropriate Governmental
Bodies made in compliance with all applicable Laws, and the Company has
substantially complied with all conditions of such Permits applicable to it. No
material default or violation, or event that with the lapse of time or giving of
notice or both would become a material default or violation, has occurred in the
due observance of any such Permit. All such Permits are in full force and effect
without further consent or approval of any Person. The Company has not received
any notice from any source to the effect that there is lacking any such Permit
required in connection with the current operations of the Company. The Company
has made all required filings with Governmental Bodies, except where the failure
to make such filings could not reasonably be expected, individually or in the
aggregate, to cause a Material Adverse Change.

         4.18 Environmental Matters. (a) Except as set forth on Schedule 4.18,
the operations of the Company have been and, as of the Closing Date, will be in
compliance with all Environmental Laws, except where the failure to be in such
compliance could not reasonably be expected, individually or in the aggregate,
to cause a Material Adverse Change; (b) the Company has obtained, currently
maintains and, as of the Closing Date, will have all Environmental Permits
necessary for its operations, other than such Environmental Permits the lack of
which could not reasonably be expected, individually or in the aggregate, to
cause a Material Adverse Change; all such Environmental Permits are and, as of
the Closing Date, will be, in good standing; there are no Legal Proceedings
pending or, to the best knowledge of the Company, threatened to revoke any such
Environmental Permit; the Company is, and as of the Closing Date will be, in
compliance with such Environmental Permits; and the Company has not received any
notice from any source, or has otherwise obtained knowledge, to the effect that
there is lacking any Environmental Permit required in connection with the
current use or operation of any Real Property Lease; (c) the Company and all of
its past and current Facilities and operations are not subject to any
outstanding written Order or Contract, including Environmental Liens, with any
Governmental Body or Person, or to the best knowledge of the Company subject to
any federal, state, local or foreign investigation respecting (1) Environmental
Laws, (2) any Remedial Action or (3) any Environmental Claim arising from the
Release or threatened Release of a Hazardous Material; (d) the Company is not
subject to any Legal Proceeding alleging the violation of any Environmental Law
or Environmental Permit; (e) the Company has not received (nor, to the best
knowledge of the Company, has there been issued) any written communication,
whether from a Governmental Body, citizens' group, Employee or any other Person,
that alleges that the Company is not in compliance with any Environmental Law or
Environmental Permit; (f) the Company has not caused or permitted any Hazardous
Materials to remain or be disposed of, either on or under real property legally
or beneficially owned or operated by the Company or on any real property not
permitted to accept, store or dispose of such Hazardous Materials; (g) the
Company does not have any liabilities with respect to Hazardous Materials, and
no facts or circumstances exist which, in the aggregate, could give rise to
liabilities with respect to Hazardous Materials; (h) none of the operations of
the Company involves the generation, transportation, treatment, storage or
disposal of hazardous waste or subject waste, as defined 




                                       13
<PAGE>   17

under 40 C.F.R. Parts 260-270 (in effect as of the date of this Agreement); and
(i) there is not now on or in any property of the Company (1) any underground
storage tanks or surface tanks, dikes or impoundments; (2) any
asbestos-containing materials or (3) any polychlorinated biphenyls, that, in any
such case described in this clause (i), could reasonably be expected,
individually or in the aggregate, to cause a Material Adverse Change.

         4.19 Investment Company Act. The Company is not, nor is it directly or
indirectly controlled by or acting on behalf of any Person that is, an
investment company within the meaning of the Investment Company Act of 1940, as
amended.

         4.20 Transactions with Affiliates. Except as set forth on Schedule
4.20, the Company has not made any payment to, or received any payment from, or
made or received any investment in, or entered into any transaction with, any
Affiliate, including without limitation, the purchase, sale or exchange of
property or the rendering of any service, where the amounts involved is material
to the business of the Company.

         4.21 Disclosure; Survival. This Agreement, the Financial Statements,
schedules provided in connection with this Agreement and the Offering
Memorandum, taken as a whole, do not contain any untrue statement of material
fact, fairly represent the business, properties, assets, and condition,
financial or otherwise, of the Company in all material respects, and do not fail
to state a material fact necessary in order to make the statements contained
therein and herein, when taken as a whole, not misleading. There is no fact
which has not been disclosed to the Purchasers of which the Company is aware and
which materially adversely affects or could reasonably be anticipated to
materially adversely effect the business, financial condition, operating
results, earnings, assets, customary, supplier, Employee or sales representative
relations or business prospects of the Company. All representations, warranties,
covenants and agreements set forth in this Agreement or in any writing or
certificate delivered in connection with this Agreement shall survive the
execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby and shall not be affected by any examination
made for or on behalf of any Purchaser, the knowledge of any Purchaser, or the
acceptance by any Purchaser of any certificate or opinion.

         4.22 Financial Advisors. Except as disclosed on Schedule 4.22, no
agent, broker, investment banker, finder, financial advisor or other person
acting on behalf of the Company or under its authority is or will be entitled to
any broker's or finder's fee or any other commission or similar fee, directly or
indirectly, in connection with the transactions contemplated by this Agreement
or any Transaction Document and no Person is entitled to any fee or commission
or like payment in respect thereof based in any way on agreements, arrangements
or understandings made by or on behalf of the Company.

         4.23 Insurance. Schedule 4.23 lists all insurance policies carried by
the Company covering its properties and business. Such insurance insures against
such losses and risks as are adequate in accordance with customary industry
practice to protect the Company and its business. The Company is not in material
default with respect to its obligations under any insurance policy maintained by
it.



                                       14
<PAGE>   18

         4.24 Dissolution of Previous Entities. The dissolution of MGC
Communications, LLC, a Georgia limited liability company, formerly known as
NevTEL, LLC (the "LLC"), and the distribution of the shares of Common Stock of
the Company held by the LLC (the "Reorganization") was consummated in compliance
with all applicable Laws. No person was or is entitled to receive any shares of
capital stock or other consideration which have been distributed as a result of
the Reorganization.

         4.25 Improper Actions. The Company, or to the best knowledge of the
Company, any of its officers, directors, partners, employees, agents or
affiliates or any other person acting on behalf of the Company has not, directly
or indirectly, given or agreed to give any money, gift or similar benefit (other
than legal price concessions to customers in the ordinary course of business) to
any customer, supplier, employee or agent of a customer or supplier, official or
employee of any Governmental Body), Governmental Body or any political party or
candidate for office (domestic or foreign) or other person who was, is or may be
in a position to help or hinder the business of the Company (or assist the
Company in connection with any actual or proposed transaction) which (i) might
subject the Company, or any other individual or entity to any damage or penalty
in any Legal Proceeding, (ii) if not given in the past, might have caused a
Material Adverse Change or (iii) if not continued in the future, might cause a
Material Adverse Change.

     5. REPRESENTATIONS AND WARRANTIES OF THE PURCHASERS. Each Purchaser
hereby represents and warrants to the Company, severally, for itself only, that:

         5.1 Organization and Good Standing. Each Purchaser is duly organized,
validly existing and in good standing under the laws of the jurisdiction of its
formation or incorporation, as applicable.

         5.2 Authorization of Agreement. Each Purchaser has full corporate or
partnership power and authority to execute and deliver this Agreement and each
other agreement, document, instrument or certificate contemplated by this
Agreement or to be executed by each Purchaser in connection with the
consummation of the transactions contemplated hereby and thereby (the "Purchaser
Documents"), and to perform fully its obligations hereunder and thereunder. The
execution, delivery and performance by such Purchaser of this Agreement and each
Purchaser Document has been duly authorized by all necessary corporate or
partnership action on behalf of such Purchaser. This Agreement and each
Purchaser Document has been duly executed and delivered by such Purchaser and
(assuming the due authorization, execution and delivery by the other parties
hereto and thereto) this Agreement and each Purchaser Document constitute the
legal, valid and binding obligations of each Purchaser, enforceable against such
Purchaser in accordance with their respective terms.

         5.3 Purchaser Representation. Each Purchaser has such knowledge and
experience in financial and business matters that it is capable of evaluating
the merits and risks of an investment in the Shares. Each Purchaser has been
given the opportunity to examine all documents provided by, conduct due
diligence and ask questions of, and to receive answer from,



                                       15
<PAGE>   19

the Company and their respective representatives concerning the terms and
conditions of an investment in the Shares.

         5.4 Investment Intention. Each Purchaser is acquiring the Shares for
its own account, for investment purposes only and not with a view to the
distribution (as such term is used in Section 2(11) of the Securities Act)
thereof in violation of the Securities Act, and that it is an "accredited
investor" within the meaning of Rule 501 of Regulation D of the Securities and
Exchange Commission. Each Purchaser understands that the Shares have not been
registered under the Securities Act and cannot be sold unless subsequently
registered under the Securities Act or an exemption from such registration is
available. The principal place of business or domicile of each Purchaser is
located in the jurisdiction where notices are to be sent to such Purchaser as
set forth on Schedule 1.

         5.5 Financial Advisors. No agent, broker, investment banker, finder,
financial advisor or other person acting on behalf of each Purchaser or under
its authority is or will be entitled to any broker's or finder's fee or any
other commission or similar fee, directly or indirectly, in connection with the
transactions contemplated by this Agreement or any Transaction Document and no
Person is entitled to any fee or commission or like payment in respect thereof
based in any way on agreements, arrangements or understandings made by or on
behalf of each Purchaser.

         5.6 Reliance. In making its decision to acquire the Shares, no
Purchaser has relied on any information provided by the Company or its
representatives other than the Offering Memorandum and the representations and
warranties contained herein and in the other documents executed in connection
herewith.

     6.  FURTHER AGREEMENTS OF THE PARTIES.

         6.1 Covenants. (a) For so long as the Shares are convertible, the
Company shall reserve that number of shares of Common Stock issuable upon
conversion of the Shares, which shares shall not be subject to any preemptive or
other similar rights (collectively, the "Reserved Shares").

         6.2 Use of Proceeds. The Company shall use all of the proceeds from the
sale of the Shares under this Agreement in accordance with the "Use of Proceeds"
section of the Offering Memorandum.

         6.3 Access to Information. Until the consummation of a Public Offering,
the Purchasers shall be entitled, at their expense, upon reasonable notice, to
make such reasonable investigation of the properties, businesses and operations
of the Company and such examination of the books, records and financial
condition of the Company as they reasonably request and to make extracts and
copies of such books and records. Any such investigation and examination shall
be conducted during regular business hours and under reasonable circumstances
without material interference with the Company's normal business operations, and
the Company and its respective employees shall cooperate fully therein. No
investigation by the Purchasers prior to or after the date of this Agreement
shall diminish or obviate any of the representations, warranties, 



                                       16
<PAGE>   20

covenants or agreements of the Company contained in this Agreement or the
Transaction Documents. In order that the Purchasers may have full opportunity to
make such physical, business, accounting and legal review, examination of the
affairs of the Company investigation as may be reasonably requested, the Company
shall cause its Representative to cooperate fully with the Representatives of
the Purchaser in connection with such review and examination; provided that the
Company shall not incur any material expense related thereto. Each Purchaser
shall use its reasonable best efforts to maintain the confidentiality of
information obtained as a result of the exercise of its rights granted under
this Section 6.3.

         6.4 Confidentiality. Except as may be required by applicable law,
neither the Company nor the Purchasers or any of their respective Affiliates
shall at any time divulge, disclose, disseminate, announce or release any
information to any person concerning this Agreement, the Transaction Documents
or the transactions contemplated hereby or thereby without first obtaining the
prior written consent of the other party hereto; provided, however, each
Purchaser shall be entitled to disclose information with respect to its
investment in the Company on any reports such Purchaser furnishes to its
investors or as otherwise required by Law and the Company may disclose the terms
of this Agreement in connection with an issuance of debt or equity securities.

         6.5 Other Actions. The Company and the Purchasers agree to execute and
deliver such other documents and take such other actions, as the other party may
reasonably request for the purpose of carrying out the intent of this Agreement
and the Transaction Documents.

         6.6 Indemnity (a) The Company agrees to indemnify, defend and hold
harmless each Purchaser (and its partners (and each officer and director
thereof), directors, officers, members, shareholders, Employees, affiliates,
agents and permitted assigns) from and against any and all losses, liabilities,
damages, deficiencies, costs or expenses (including interest, penalties, and
reasonable attorneys' fees, disbursements and related charges) (collectively,
"Losses") based upon, arising out of or otherwise in respect of any inaccuracy
in or breach of any representations, warranties, covenants or agreements of the
Company contained in this Agreement or the Transaction Documents.

         (b) Each Purchaser agrees, severally, for itself only, to indemnify,
defend and hold harmless the Company (and its partners (and each officer and
director thereof), directors, officers, members, shareholders, Employees,
affiliates, agents and permitted assigns) from and against any and all Losses
based upon, arising out of or otherwise in respect of any inaccuracy in or
breach of any representations, warranties, covenants or agreements of each
Purchaser contained in this Agreement or the Transaction Documents.

         6.7 U.S. Real Property Holding Corporation. The Company covenants that
it will operate in a manner such that it will not become a "United States real
property holding corporation" as such term is defined in Section 897(c)(2) of
the Internal Revenue Code of 1986, as amended ("USRPHC"), and the regulations
thereunder. The Company agrees to make determinations as to its status as a
USRPHC, and will file statements concerning those 




                                       17
<PAGE>   21

determinations with the Internal Revenue Service, in the manner and at the times
required under Reg. 1.897-2(h), or any supplementary or successor provision
thereto. Within 30 days of a request from a Purchaser, the Company will inform
the requesting party, in the manner set forth in Reg. 1.897-2(h) or any
supplementary or successor provision thereto, whether that party's interest in
the Company constitutes a United States real property interest (within the
meaning of Internal Revenue Code Section 897(c)(1) and the regulations
thereunder) and whether the Company has provided to the Internal Revenue Service
all required notices as to its USRPHC status.

         6.8 Financial Statements, Reports, Etc. The Company shall furnish to
each Purchaser which, together with its Affiliates, purchases and continues to
own at least 285,714 Shares:

         (a) as soon as available, and in any event within 90 days after the end
of each fiscal year of the Company, (i) a consolidated audited financial
statement of the Company as of the end of such fiscal year; (ii) the related
consolidated statements of income, stockholders' equity and cash flows for the
fiscal year then ended, prepared in accordance with GAAP and certified by a firm
of independent public accountants of recognized national standing selected by
the board of directors of the Company and acceptable to a majority of the
Purchasers (the "Annual Financial Statement"); and (iii) any related management
letters from such accounting firm. The Audited Financial statements shall be
accompanied by a management report describing the state of the Company's
business at year end.

         (b) as soon as available, and in any event within 30 days after the end
of each month in each fiscal year a consolidated balance sheet of the Company,
and the related consolidated statement of income (with statements of
stockholders' equity and cash flows to be provided quarterly), unaudited but
prepared in accordance with GAAP (except that such unaudited financial statement
do not contain all of the required footnotes and are subject to normal,
recurring non-material year-end adjustments) and certified by the chief
financial officer of the Company (the "Monthly Balance Sheet"). The Monthly
Balance Sheet should be prepared as of the end of such month with consolidated
statements of income, stockholders' equity and cash flows for such month and for
the period from the beginning of the fiscal year to the end of such month, in
each case with comparative statements for the prior fiscal year and the most
recent 12-month budget delivered by the Company pursuant to Section 6.8(c)
hereof;

         (c) as soon as available and in any event no later than 30 days prior
to the start of each fiscal year (except for the budget with respect to 1998,
which is due on January 1, 1998), an annual business plan and consolidated
capital and operating expense budget, cash flow projections and income and loss
projections for the Company, in respect of such fiscal year, as approved by the
board of directors of the Company and all itemized in reasonable detail and
prepare on a quarterly basis, and, promptly after preparation, any revisions to
any of the foregoing;

         (d) any document relating to the affairs of the Company delivered to
the shareholders of the Company; or



                                       18
<PAGE>   22

         (e) prompt notice, and in any event within five days after notice has
been received by the Company, of any material litigation or an adverse claims,
dispute or any other developments which could reasonably be expected to be
material to operations, assets, or properties of the Company.

         provided, however, that the rights provided in this Section 6.8 to a
Purchaser shall terminate with respect to such Purchaser (a) upon the earlier of
a Public Offering or (b) when such Purchaser (or its Affiliates) owns less than
fifty percent of the Shares, (including the Common Stock issuable thereto)
purchased by such Purchaser at the Closing; and provided further that the rights
provided in this Section 6.8 shall only be transferable to a transferee that
acquires and continues to own at least 50% of the Shares acquired by the
Purchaser hereunder.

     7.  DOCUMENTS TO BE DELIVERED AT THE CLOSING.

         7.1 Documents to be Delivered by the Company. At the Closing, the
Company shall deliver, or cause to be delivered, to each Purchaser the
following:

             (a) Certificates representing the Shares issued hereunder;

             (b) an opinion of Ellis Funk, Goldberg, Labovitz & Dokson, P.C. and
     Kelley Drye and Warren LLP, in form and substance satisfactory to the
     Purchasers;

             (c) the Stockholders Agreement;

             (d) (i) certificate of good standing with respect to the Company
     issued by the secretary of state of Nevada; (ii) copy, certified by the
     secretary or assistant secretary of the Company, as being a true and
     complete copy as of the Closing Date, of the by-laws of the Company; and
     (iii) copy, certified by the Secretary of State of Nevada, of the
     certificate of incorporation of the Company;

             (e) (i) copy of resolutions of the board of directors of the
     Company, authorizing the execution, delivery and performance of this
     Agreement and the Transaction Documents, the issuance of the Series A
     Preferred Stock and the reservation of the Reserved Shares; (ii) and a
     certificate of the secretary or assistant secretary of the Company, dated
     the Closing Date certifying that such resolutions were duly adopted and are
     in full force and effect and attesting to the true signatures and to the
     incumbency of the officers of the Company, executing this Agreement and the
     Transaction Documents; and

             (f) a certificate, certified by the President or any Vice-President
     of the Company, stating that the respective representations and warranties
     of the Company contained in this Agreement are true and correct in all
     material respects on and as of the Closing Date.

             (g) such other documents as the Purchasers shall reasonably
     request.



                                       19
<PAGE>   23

         7.2 Delivery of Purchase Price. At the Closing, each Purchaser shall
deliver its Purchase Price by wire transfer to an account of which the Company
shall notify the Purchasers prior to the Closing Date.

    8.   MISCELLANEOUS.

         8.1 Certain Definitions

         "Affiliate" of any Person means any Person that directly or indirectly
controls, or is under common control with, or is controlled by, such Person. As
used in this definition, "control" (including with its correlative meanings,
"controlled by" and "under common control with") shall mean the possession,
directly or indirectly, of the power to direct or cause the direction of the
management or policies of a Person (whether through ownership of securities or
partnership or other ownership interests, by contract or otherwise). With
respect to the Purchasers listed as S-C Purchasers on Schedule 1 hereto, the
term "Affiliate" shall include one or more of George Soros, Purnendu Chatterjee,
Chatterjee Fund Management, L.P. or Soros Fund Management LLC or affiliates
thereof, and any person or entity for which any such person or entity acts as
investment advisor or investment manager.

         "Benefit Plan" means each plan, program, policy, payroll practice,
contract, agreement or other arrangement providing for compensation, severance,
termination pay, performance awards, stock or stock related awards, fringe
benefits or other employee benefits of any kind, whether formal or informal,
funded or unfunded, written or oral and whether or not legally binding,
including, without limitation, each "Employee benefit plan," within the meaning
of Section 3(3) of ERISA and each "multi-employer plan" within the meaning of
Section 3(37) or 4001(a)(3) of ERISA.

         "Code" means the Internal Revenue Code of 1986, as amended, and the
rules and regulations promulgated thereunder.

         "Common Stock" means the Company's common stock, par value $.001 per
share.

         "Communications Act" means the Communications Act of 1934, as amended,
and the rules and regulations and practices of the FCC. "Company Benefit Plan"
means each Benefit Plan (other than an Employee Agreement) which is now or
previously has been sponsored, maintained, contributed to, or required to be
contributed to, or with respect to which any withdrawal liability (within the
meaning of Section 4201 of ERISA) has been incurred, by the Company for the
benefit of any Employee, and pursuant to which the Company has or may have any
liability, contingent or otherwise.

         "Contract" means any contract, agreement, indenture, note, bond, loan,
instrument, lease, conditional sale contract, mortgage, license, franchise,
insurance policy, commitment or other arrangement or agreement, whether written
or oral.


                                       20
<PAGE>   24


         "Employee" means each current, former, or retired employee, office
consultant, independent contractor, agent or director of the Company.

         "Employee Agreement" means each management, employment, severance,
consulting, non-compete, confidentiality, or similar agreement or contract
between the Company, and any Employee pursuant to which the Company has or may
have any liability contingent or otherwise.

         "Environmental Claim" means any accusation, allegation, notice of
violation, action, claim, Lien, demand, abatement or other Order or direction
(conditional or otherwise) by any Governmental Body or any Person for personal
injury (including sickness, disease or death), tangible or intangible property
damage, damage to the environment, nuisance, pollution, contamination or other
adverse effects on the environment, or for fines, penalties or restrictions
resulting from or based upon (i) the existence, or the continuation of the
existence, of a Release (including, without limitation, sudden or non-sudden
accidental or non-accidental Releases) of, or exposure to, any Hazardous
Material or other substance, chemical, material, pollutant, contaminant, odor,
audible noise, or other Release in, into or onto the environment (including,
without limitation, the air, soil, surface water or groundwater) at, in, by,
from or related to the Facilities or any activities conducted thereon; (ii) the
environmental aspects of the transportation, storage, treatment or disposal of
Hazardous Materials in connection with the operation of the Facilities; or (iii)
the violation, or alleged violation, of any Environmental Laws, Orders or
Permits of or from any Governmental Body relating to environmental matters
connected with the Facilities.

         "Environmental Law" means any Law concerning Releases into any part of
the natural environment, or activities that might result in damage to the
natural environment, or any Law that is concerned in whole or in part with the
natural environment and with protecting or improving the quality of the natural
environment and protecting public and Employee health and safety and includes,
but is not limited to, the Comprehensive Environmental Response, Compensation,
and Liability Act ("CERCLA") (42 U.S.C. ss. 9601 et seq.), the Hazardous
Materials Transportation Act (49 U.S.C. ss. 1801 et seq.), the Resource
Conservation and Recovery Act (42 U.S.C. ss. 6901 et seq.), the Clean Water Act
(33 U.S.C. ss. 1251 et seq.), the Clean Air Act (33 U.S.C. ss. 7401 et seq.),
the Toxic Substances Control Act (15 U.S.C. ss. 2601 et seq.), the Federal
Insecticide, Fungicide, and Rodenticide Act (7 U.S.C. ss. 136 et seq.) and the
Occupational Safety and Health Act (29 U.S.C. ss. 651 et seq.) ("OSHA"), as such
laws have been amended or supplemented, and the regulations promulgated pursuant
thereto, and any and all analogous state or local statutes, and the regulations
promulgated pursuant thereto, and any and all treaties, conventions and
environmental public and employee health and safety statutes and regulations or
analogous requirements of non-United States jurisdictions in which the Company
conducts any business.

         "Environmental Matters" means any matter arising out of or relating to
the production, storage, transportation, disposal or Release of any Hazardous
Material or otherwise arising out of or relating to safety, health or the
environment which could give rise to liability or require the expenditure of
money to address, and shall include, without limitation, the costs of


                                       21
<PAGE>   25

investigating and remedying any of the foregoing matters, any fines and
penalties arising in connection therewith, and any claim in respect thereof for
damages or injunctive relief for alleged personal injury, property damage or
damage to natural resources under common law or other Environmental Law.

         "Environmental Permit" means any Permit, variance, registration, or
permission required under any applicable Environmental Laws.

         "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended and any regulations promulgated or proposed thereunder.

         "Facility" means real property owned, leased or operated by the
Company.

         "FCC" means the Federal Communication Commission and any successor
thereto.

         "GAAP" means generally accepted accounting principles, as in effect in
the United States.

         "Governmental Body" means any government or governmental or regulatory
body thereof, or political subdivision thereof, whether federal, state, local or
foreign, or any agency, instrumentality or authority thereof, or any court or
arbitrator (public or private).

         "Hazardous Materials" means any substance, material or waste which is
regulated by any local, state or federal Governmental Body in the jurisdiction
in which the Company conducts business, or the United States, including, without
limitation, any material or substance which is defined as a "hazardous waste,"
"hazardous material," "hazardous substance," "extremely hazardous waste" or
"restricted hazardous waste," "subject waste," "contaminant," "toxic waste" or
"toxic substance" under any provision of Environmental Law, including but not
limited to, petroleum products, asbestos, radon and polychlorinated biphenyls.

         "Law" means any federal, state, local or foreign law (including common
law), statute, code, ordinance, rule, regulation or other requirement or
guideline (including, without limitation, the Communications Act and the rules
and regulations of the FCC.

         "Legal Proceeding" means any judicial, administrative or arbitral
actions, suits, proceedings (public or private), claims or governmental
proceedings.

         "Lien" means any lien, pledge, hypothecation, levy, mortgage, deed of
trust, security interest, claim, lease, charge, option, right of first refusal,
easement, or other real estate declaration, covenant, condition, restriction or
servitude, transfer restriction under any shareholder or similar agreement,
encumbrance or any other restriction or limitation whatsoever.

         "Material Adverse Change" means any material adverse change in the
business, properties, results of operations, prospects or condition (financial
or otherwise) of the Company.



                                       22
<PAGE>   26

         "material default" means a default which could reasonably be expected
to result in a Material Adverse Change.

         "Order" means any order, injunction, judgment, decree, ruling, writ,
assessment or arbitration award.

         "Permits" means any approvals, authorizations, consents, licenses,
permits or certificates by any Governmental Body (including, with respect to the
FCC).

         "Person" means any individual, corporation, partnership, firm, joint
venture, association, joint-stock company, trust, unincorporated organization,
Governmental Body or other entity.

         "Public Offering" means a firm commitment underwritten public offering
of shares of Common Stock pursuant to an effective registration statement under
the Securities Act of 1933, as then in effect or any comparable statement under
any similar federal statute then in force or effect.

         "Release" means any release, spill, effluent, emission, leaking,
pumping, injection, deposit, disposal, discharge, dispersal, leaching, or
migration into the indoor or outdoor environment, or into or out of any property
owned, operated or leased by the Company, including the movement of any
Hazardous Material or other substance through or in the air, soil, surface
water, groundwater, or property.

         "Remedial Action" means all actions, including, without limitation, any
capital expenditures, required or voluntarily undertaken to (i) clean up,
remove, treat, or in any other way address any Hazardous Material or other
substance in the indoor or outdoor environment; (ii) prevent the Release or
threat of Release, or minimize the further Release of any Hazardous Material or
other substance so it does not migrate or endanger or threaten to endanger
public health or welfare of the indoor or outdoor environment; (iii) perform
pre-remedial studies and investigations or post-remedial monitoring and care; or
(iv) bring any Facility into compliance with all Environmental Laws and
Environmental Permits.

         "Representatives" of a Person means its officers, Employees, agents,
legal advisors and accountants.

         "Senior Notes" means the Company's 13% Senior Secured Notes due 2004.

         "Stockholders Agreement" means the Stockholders' Agreement dated as of
the date hereof, by and among the Company and the shareholders listed on the
signature pages thereto.

         "Taxes" means any federal, state, local or foreign income, gross
receipts, license, payroll, employment, excise, severance, stamp, occupation,
premium, windfall profits, environmental (including taxes under Section 59A of
the Internal Revenue Code of 1986, as amended (the "Code")), customs duties,
capital stock, franchise, profits, withholding, social 



                                       23
<PAGE>   27

security (or similar), unemployment, disability, real property, personal
property, sales, use, transfer, registration, value added, alternative or add-on
minimum, estimated, or other tax of any kind whatsoever, including any interest,
penalty, or addition thereto, whether disputed or not.

         "Tax Return" means any return declaration, report, claim for refund, or
information return or statement relating to Taxes, including any schedule or
attachment thereto, and including any amendment thereof.

         8.2 Tax Treatment of Preferred Stock. The Company agrees that the
Series A Preferred Stock is stock which participates in corporate growth to a
significant extent within the meaning of Treasury Regulation ss.1.305-5(a), and
hence will not be treated as preferred stock for purposes of Internal Revenue
Code ss.305 and the regulations thereunder. Accordingly, the Company has
determined that there will not be constructive distributions under Treasury
Regulation ss.1.305-5(b) with respect to the Series A Preferred Stock.

         8.3 Expenses. The Company shall pay the reasonable fees and expenses of
the Purchasers associated with this transaction, including legal expenses (which
the Purchasers shall use their reasonable best efforts to cap at $30,000),
consulting expenses (not in excess of $10,000) and out-of pocket expenses. In
addition, the Company shall pay all stamp and other taxes which may be payable
in respect of the execution and delivery of this Agreement, the Transaction
Documents, or the issuance, delivery or acquisition of the Shares.

         8.4 Specific Performance. The Company acknowledges and agrees that the
breach of this Agreement would cause irreparable damage to the Purchasers and
that the Purchasers will not have an adequate remedy at law. Therefore, the
obligations of the Company under this Agreement, including, without limitation,
the Company's obligation to sell the Shares to the Purchasers, shall be
enforceable by a decree of specific performance issued by any court of competent
jurisdiction, and appropriate injunctive relief may be applied for and granted
in connection therewith. Such remedies shall, however, be cumulative and not
exclusive and shall be in addition to any other remedies which any party may
have under this Agreement or otherwise.

         8.5 Further Assurances. The Company and the Purchasers each agree to
execute and deliver such other documents or agreements as may be necessary or
desirable for the implementation of this Agreement and the consummation of the
transactions contemplated hereby.

         8.6 Submission to Jurisdiction; Consent to Service of Process.

         (a) The parties hereto hereby irrevocably submit to the non-exclusive
jurisdiction of any federal or state court located within the County of Cook,
State of Illinois over any dispute arising out of or relating to this Agreement
or any of the transactions contemplated hereby and each party hereby irrevocably
agrees that all claims in respect of such dispute or any suit, action or
proceeding related thereto may be heard and determined in such courts. The
parties hereby irrevocably waive, to the fullest extent permitted by applicable
law, any objection which they may now or hereafter have to the laying of venue
of any such dispute brought in such 



                                       24
<PAGE>   28

court or any defense of inconvenient forum for the maintenance of such dispute.
Each of the parties hereto agrees that a judgment in any such dispute may be
enforced in other jurisdictions by suit on the judgment or in any other manner
provided by law.

         (b) Each of the parties hereto hereby consents to process being served
by any party to this Agreement in any suit, action or proceeding by the mailing
of a copy thereof in accordance with the provisions of Section 8.9.

         8.7  Entire Agreement; Amendments and Waivers. This Agreement
(including the schedules and exhibits hereto) represents the entire
understanding and agreement between the parties hereto with respect to the
subject matter hereof and can be amended, supplemented or changed, and any
provision hereof can be waived, only by written instrument making specific
reference to this Agreement signed by the parties hereto. No action taken
pursuant to this Agreement, including without limitation, any investigation by
or on behalf of any party, shall be deemed to constitute a waiver by the party
taking such action of compliance with any representation, warranty, covenant or
agreement contained herein. The waiver by any party hereto of a breach of any
provision of this Agreement shall not operate or be construed as a further or
continuing waiver of such breach or as a waiver of any other or subsequent
breach. No failure on the part of any party to exercise, and no delay in
exercising, any right, power or remedy hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise of such right, power or remedy
by such party preclude any other or further exercise thereof or the exercise of
any other right, power or remedy. All remedies hereunder are cumulative and are
not exclusive of any other remedies provided by law.

         8.8  Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of the State of New York without giving effect to
the principles of conflict of laws thereunder which would specify the
application of the law of another jurisdiction.

         8.9  Table of Contents; Headings; Interpretive Matters. The table of
contents and section headings of this Agreement are for reference purposes only
and are to be given no effect in the construction or interpretation of this
Agreement. No provision of this Agreement will be interpreted in favor of, or
against, any of the parties hereto by reason of the extent to which any such
party or its counsel participated in the drafting thereof or by reason of the
extent to which any such provision is inconsistent with any prior draft hereof
or thereof.

         8.10 Notices. All notices and other communications under this Agreement
shall be in writing and shall be deemed given when delivered personally,
telecopied or mailed by certified mail, return receipt requested, to the parties
at the following addresses (or to such other address as a party may have
specified by notice given to the other party pursuant to this provision):




                                       25
<PAGE>   29

         If to the Company, to:

                  MGC Communications, Inc.
                  3301 North Buffalo
                  Las Vegas, Nevada 89129
                  Attn:
                  Fax:     (702) 310-1111

         With a copy (which shall by itself not constitute notice) to:

                  Ellis, Funk, Goldberg, Labovitz & Dokson, P.C.
                  3490 Piedmont Road
                  Suite 400
                  Atlanta, Georgia 30305
                  Attn:  Robert B. Goldberg
                  Fax:  (404) 233-2188

         If to the Purchasers, to the address listed in Schedule 1.

         With a copy (which shall by itself not constitute notice) to:

                  Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                  590 Madison Avenue
                  New York, New York 10022
                  Attn:    Patrick J. Dooley, Esq.
                  Fax:     (212) 872-1002

         All notices are effective upon receipt or upon refusal if properly
delivered.

         8.11 Severability. If any provision of this Agreement is invalid or
unenforceable, the balance of this Agreement shall remain in effect.

         8.12 Binding Effect; Assignment. This Agreement shall be binding upon
and inure to the benefit of the parties and their respective successors and
permitted assigns (as permitted in accordance with the terms of this Agreement).
Nothing in this Agreement shall create or be deemed to create any third-party
beneficiary rights in any person or entity not a party to this Agreement except
as provided below. No assignment of this Agreement or of any rights or
obligations hereunder may be made by the Company or the Purchaser (by operation
of law or otherwise) without the prior written consent of the other parties
hereto and any attempted assignment without the required consents shall be void;
provided, however, that the Purchasers may assign this Agreement and any or all
rights and obligations hereunder, in whole or in part, to any Affiliate of the
Purchasers, but any such assignment shall not relieve the Purchasers of their
respective obligations hereunder. In addition, and whether or not any express
assignment has been made, the provisions of this Agreement which are for the
benefit of any Purchaser as a purchaser or holder of Shares (or any securities
pursuant to which such Shares may be converted or exercised into) are also for
the benefit of and enforceable by, any subsequent holder of such 



                                       26
<PAGE>   30

securities. Upon any permitted assignment, the references in this Agreement to
the Purchasers shall also apply to any such assignee unless the context
otherwise requires.

         8.13 Counterparts. This Agreement may be executed simultaneously in two
or more counterparts, each of which shall be deemed an original but all of which
together shall constitute one and the same instrument.




                                       27
<PAGE>   31


                  SECURITIES PURCHASE AGREEMENT SIGNATURE PAGES

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized, as of the date
first written above.


                          MGC COMMUNICATIONS, INC.


                          By:
                                  ------------------------------------
                                  Name:
                                  Title:


                          PURCHASERS:



                          JK&B CAPITAL, L.P.

                          By: JK&B Management, L.L.C.
                          Its: General Partner


                          By:
                                  ------------------------------------
                                  Name: David Kronfeld
                                  Title:  Manager


                          JK&B CAPITAL II, L.P.

                          By: JK&B Management, L.L.C.
                          Its: General Partner


                          By:
                                  ------------------------------------
                                  Name: David Kronfeld
                                  Title:  Manager


                          STRATEGIC INVESTMENT PARTNERS LIMITED


                          By:
                                  ------------------------------------
                                  Name:
                                  Title: Attorney-in-Fact


                                       S-1
<PAGE>   32

                          S-C PHOENIX HOLDINGS, L.L.C.


                          By:
                                  -------------------------------------
                                  Name:
                                  Title:


                          WINSTON PARTNERS II LDC



                          By:
                                  -------------------------------------
                                  Name:
                                  Title: Attorney-in-Fact
  

                           WINSTON PARTNER II LLC

                           By:  Chatterjee Advisors L.L.C.
                           Its: Manager

                           By:
                                   -------------------------------------
                                   Name:
                                   Title:  Manager


                           WIND POINT PARTNERS III, L.P.

                           By: WIND POINT PARTNERS, LLC
                           Its: General Partner


                           By:
                                   -------------------------------------
                                   Name:
                                   Title:


                             S-2

<PAGE>   33


                          BOSTON CAPITAL VENTURES III, L.P.


                          By:
                                  -------------------------------------
                                  Name:
                                  Title:

                          FARLEY, INC.


                          By:
                                  -------------------------------------
                                  Name:
                                  Title:


                          FRUIT OF THE LOOM, INC. SENIOR EXECUTIVE OFFICER
                          DEFERRED COMPENSATION TRUST


                          By:
                                  -------------------------------------
                                  Name:
                                  Title:


                          ---------------------------------------------
                          William Farley



                          ---------------------------------------------
                          Robert W. Humes



                                      S-3
<PAGE>   34


                        WESTBURY CAPITAL PARTNERS, L.P.

                        By: Westbury MGP, L.P., its general partner

                            By: JK Fogg & Co. Incorporated, its general partner


                                By:
                                    -------------------------------------------
                                    Name:
                                    Title:


                        ----------------------------------------------------
                        Jeffrey H. Freed



                        ----------------------------------------------------
                        Brett J. Rome



<PAGE>   35



                                                                      SCHEDULE 1


<TABLE>
<CAPTION>
Name of Purchaser                                  Dollar Amount            Series A Preferred
- -----------------                                  -------------            ------------------
<S>                                                <C>                      <C>    
JK&B Capital, L.P.                                 $3,350,000                   957,143
JK&B Capital II, L.P.                              $1,650,000                   471,429

205 North Michigan
Suite 808
Chicago, Ill 60601
Attn: David Kronfeld
Fax No.: (312) 946-1103

Strategic Investment Partners Limited              $2,000,000                   571,429
c/o Curacao Corporation
Company, N.V 
Kaya Flamboyan 9
Willemstad, Curacao
Netherlands Antilles
Facsimile No.: 011-599-9-322-001

With a copy to:

Soros Fund Management LLC
888 Seventh Avenue
New York, New York 10106
Attention: Michael C. Neus
Facsimile No.: (212) 664-0544

S-C Phoenix Holdings, L.L.C                        $1,250,000                   357,142
c/o Soros Fund Management LLC
888 Seventh Avenue
New York, New York 10106
Facsimile No.: 212-664-0544
Attention: Michael C. Neus

Winston Partners II LDC                            $  500,000                   142,857
c/o Curacao Corporation
Company, N.V 
Kaya Flamboyan 9
Willemstad, Curacao
Netherlands Antilles
Facsimile No.: 011-599-9-322-001
</TABLE>



                                       1
<PAGE>   36


<TABLE>
<S>                                                <C>                        <C>  
With a copy to:

The Chatterjee Group
888 Seventh Avenue
New York, New York 10106
Attention: Thomas Neustaetter/Peter Hurwitz
Facsimile No.: (212) 489-2005

Winston Partners II LLC                            $   250,000                   71,429
c/o Chatterjee Advisors L.L.C
c/o The Chatterjee Group
888 Seventh Avenue
New York, New York 10106
Attention: Thomas Neustaetter /Peter Hurwitz
Facsimile No.: (212) 489-2005

Wind Point Partners III, L.P.                      $ 4,000,000                1,142,857
676 N. Michigan Avenue
Suite 3300
Chicago, Ill 60611
Attn: James Tenebrook
Fax No.: (312) 649-9644

Boston Capital Ventures III, L.P.                  $ 1,000,000                  285,714
45 School Street
Boston, Ma 02108
Attn: Johan von der Goltz
Fax No.: (617) 227-3847

Farley, Inc.                                       $ 1,000,000                  285,714
Fruit of the Loom, Inc. 
Senior Executive Officer
Deferred Compensation Trust                        $   500,000                  142,857
William Farley                                       1,500,000                  428,571
Farley Group
c/o Fruit of the Loom
233 South Wacker Drive
5000 Sears Tower
Chicago, Ill 60606
Attn: David Vogel
Fax No.: (312) 993 1749
</TABLE>

                                       2

<PAGE>   37


<TABLE>
<S>                                                <C>                            <C>  
Mr. Robert W. Humes                                $    20,000                    5,714
17137 Yearlings Lane
Wadsworth, Ill 60083
Fax No.: (847) 855-0336

Westbury Capital Partners, L.P.                    $   950,000                  271,429
400 Post Avenue
Westbury, NY 11590

Jeffrey H. Freed                                   $    20,000                    5,714
64 Short Way
Roslyn Heights, NY                                                                11577

Brett D. Rome                                      $    30,000                    8,571
23 St. George Place
Palm Beach Gardens, FL 33918
                                                   -----------                ---------

             TOTAL                                 $18,020,000                5,148,570
                                                   ===========                =========
</TABLE>





                                       3

<PAGE>   1
                                                                    EXHIBIT 12.1

                Computation of Ratio of Earnings to Fixed Charges
   
The ratio of earnings to fixed charges is calculated by dividing earnings (loss)
before income taxes, plus fixed charges excluding capitalized interest by fixed
charges. For the year ended December 31, 1996 and the nine months ended
September 30, 1997, the Company incurred net losses of approximately $5.1
million and had fixed charges of approximately $.1 million.
    



<PAGE>   1
                                                                 EXHIBIT 23.2


                         INDEPENDENT AUDITORS' CONSENT


The Board of Directors
MGC Communications, Inc.


   
     We consent to the use of our report dated August 18, 1997 related to the
financial statements of MGC Communications, Inc. as of December 31, 1996 and
1995 and for the year ended December 31, 1996, included herein and to the
reference to our firm under the headings "Experts", "Summary Financial Data"
and "Selected Historical Financial Data" in the prospectus.
    


                                             KPMG Peat Marwick LLP


Las Vegas, Nevada
January 7, 1998

<PAGE>   1
                                  EXHIBIT 99.1

                              LETTER OF TRANSMITTAL
                                       FOR
                   TENDER OF 13% SENIOR SECURED NOTES DUE 2004
                                 IN EXCHANGE FOR
              13% REGISTERED SERIES B SENIOR SECURED NOTES DUE 2004


                            MGC COMMUNICATIONS, INC.

THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK TIME, ON___________, 1998,
UNLESS EXTENDED (THE "EXPIRATION DATE"). OUTSTANDING NOTES TENDERED IN THE
EXCHANGE OFFER MAY BE WITHDRAWN AT ANY TIME PRIOR TO THE EXPIRATION DATE.

Deliver To The Exchange Agent: The Marine Midland Bank



<TABLE>
<S>                                <C>                                     <C>
By Hand/Overnight Courier:         By Mail:                                By Facsimile:
140 Broadway                       140 Broadway                            (212) 658-6425
New York, NY 10005-1180            New York, NY 10005-1180                 Confirm by Telephone: (212) 658-6433
Attention Corporate Trust          Attention Corporate Trust Operations    (For Eligible Institutions Only)
Operations
</TABLE>


         DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE
OR TRANSMISSION OF INSTRUCTIONS VIA A FACSIMILE NUMBER OTHER THAN THE ONE LISTED
ABOVE WILL NOT CONSTITUTE A VALID DELIVERY. THE INSTRUCTIONS ACCOMPANYING THIS
LETTER OF TRANSMITTAL SHOULD BE READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL
IS COMPLETED.

         The undersigned hereby acknowledges receipt and review of the
Prospectus dated________ , 1997 (the "Prospectus") of MGC Communications, Inc.
(the "Company") and this Letter of Transmittal (the "Letter of Transmittal"),
which together describe the Company's offer (the "Exchange Offer") to exchange
its 13% SeriesSenior Secured Notes due 2004 (the "Exchange Notes"), which have
been registered under the Securities Act of 1933, as amended (the "Securities
Act"), pursuant to a Registration Statement of which the Prospectus is a part,
for a like principal amount of its issued and outstanding 13% Senior Secured
Notes due 2004 (the "Outstanding Notes"). Capitalized terms used but not defined
herein have the respective meaning given to them in the Prospectus.

         The Company reserves the right, at any time and from time to time, to
extend the Exchange Offer at its discretion, in which event the term "Expiration
Date" shall mean the latest time and date to which the Exchange Offer is
extended. The Exchange Offer will no event, however, be extended to a date
beyond__________ , 1998. The Company shall notify the holders of the Outstanding
Notes of any extension by oral or written notice prior to 9:00 A.M., New York
time, on the next Business Day after the previously scheduled Expiration Date.

         This Letter of Transmittal is to be used by a Holder of Outstanding
Notes if original Outstanding Notes are to be forwarded herewith and may be used
if delivery of Outstanding Notes, if available, is to be made by book-entry
transfer to the account maintained by the Exchange Agent at The Depository Trust
Company (the "Book-Entry Transfer Facility") pursuant to the procedures set
forth in the Prospectus under the caption "The Exchange Offer-Book-Entry
Transfer." Holders of Outstanding Notes whose Outstanding Notes are not
immediately available, or who are unable to deliver their Outstanding Notes and
all other documents required by this Letter of Transmittal to the Exchange Agent
on or prior to the Expiration Date, or who are unable to complete the procedure
for book-entry transfer on a timely basis, must tender their Outstanding Notes
according to the guaranteed delivery procedures set forth in the Prospectus
under the caption "The Exchange Offer-Guaranteed Delivery Procedures." See
Instruction 2. Delivery of documents to the Book-Entry Transfer Facility does
not constitute delivery to the Exchange Agent.
                

<PAGE>   2



         If Outstanding Notes are tendered pursuant to the procedures for
book-entry transfer set forth in the Prospectus, a holder tendering Outstanding
Notes may transmit an Agent's Message (defined herein) to the Exchange Agent in
lieu of this Letter of Transmittal on or prior to the Expiration Date. A holder
of Outstanding Notes causing an Agent's Message to be delivered on its behalf
will be deemed to have executed and delivered this Letter of Transmittal. An
Agent's Message is a message, transmitted to the Book-Entry Transfer Facility,
received by the Exchange Agent and forming a part of a timely confirmation of
book-entry transfer, stating that the Book-Entry Transfer Facility has received
an express acknowledgment from the tendering participant in the Book-Entry
Transfer Facility that such participant has received and agrees to be bound by
this Letter of Transmittal and that the Company may enforce this Letter of
Transmittal against such participant.

         The term "Holder" with respect to the Exchange Offer means any person
in whose name Outstanding Notes are registered on the books of the Company or
any other person who has obtained a properly completed bond power from the
registered Holder. The undersigned has completed, executed and delivered this
Letter of Transmittal to indicate the action the undersigned desires to take
with respect to the Exchange Offer. Holders who wish to tender their Outstanding
Notes must complete this Letter of Transmittal in its entirety.

         The undersigned has checked the appropriate boxes below and signed this
Letter of Transmittal to indicate the action the undersigned desires to take
with respect to the Exchange Offer.

         PLEASE READ THE ENTIRE LETTER OF TRANSMITTAL AND THE PROSPECTUS 
CAREFULLY BEFORE CHECKING ANY BOX BELOW.

         THE INSTRUCTIONS INCLUDED WITH THIS LETTER OF TRANSMITTAL MUST BE
FOLLOWED. QUESTIONS AND REQUESTS FOR ASSISTANCE OR FOR ADDITIONAL COPIES OF THE
PROSPECTUS AND THIS LETTER OF TRANSMITTAL MAY BE DIRECTED TO THE EXCHANGE AGENT.

         List below the Outstanding Notes to which this Letter of Transmittal
relates. If the space below is inadequate, list the registered numbers and
principal amounts on a separate signed schedule and affix the list to this
Letter of Transmittal.


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------
DESCRIPTION OF OUTSTANDING NOTES TENDERED
- -------------------------------------------------------------------------------------------------------------------
                                                                                 Aggregate*           Registered
Name(s) and Address(es) of Registered Holder(s)                                  Principal Amount     Numbers**
<S>                                                                              <C>                  <C>








- -------------------------------------------------------------------------------------------------------------------
Attach separate schedule if necessary
- -------------------------------------------------------------------------------------------------------------------
</TABLE>

*   Unless otherwise indicated, any tendering Holder of Outstanding Notes will
    be deemed to have tendered the entire aggregate principal amount represented
    by such Outstanding Notes. All tenders must be in integral multiples of
    $1,000.
**  Need not be completed by book-entry Holders.


[ ] CHECK HERE IF TENDERED OUTSTANDING NOTES ARE ENCLOSED HEREWITH.




                                       -2-

<PAGE>   3



              [ ] CHECK HERE IF TENDERED OUTSTANDING NOTES ARE BEING DELIVERED
                  BY BOOK-ENTRY TRANSFER MADE TO THE ACCOUNT MAINTAINED BY THE
                  EXCHANGE AGENT WITH THE BOOK-ENTRY TRANSFER FACILITY AND
                  COMPLETE THE FOLLOWING (FOR USE BY ELIGIBLE INSTITUTIONS
                  ONLY):

Name of Tendering Institution:
Account Number:
Transaction Code Number:

[ ]      CHECK HERE IF TENDERED OUTSTANDING NOTES ARE BEING DELIVERED PURSUANT
         TO A NOTICE OF GUARANTEED DELIVERY ENCLOSED HEREWITH AND COMPLETE THE
         FOLLOWING (FOR USE BY ELIGIBLE INSTITUTIONS ONLY):

Name(s) of Registered Holder(s) of Outstanding Notes:
                                                     --------------------------
Date of Execution of Notice of Guaranteed Delivery:
                                                   ----------------------------
Window Ticket Number (if available):
                                    -------------------------------------------
Name of Eligible Institution that Guaranteed Delivery:
                                                      -------------------------
Account Number (if delivered by book-entry transfer):
                                                     --------------------------

[ ]      CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10
         ADDITIONAL COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR
         SUPPLEMENTS THERETO:

Name:
        ---------------------------------------
Address:      
        ---------------------------------------

        ---------------------------------------

     If the undersigned is not a broker-dealer, the undersigned represents that
it is not engaged in, and does not intend to engage in, a distribution of
Exchange Notes. If the undersigned is a broker-dealer that will receive Exchange
Notes for its own account in exchange for Outstanding Notes, it acknowledges
that the Outstanding Notes were acquired as a result of market-making activities
or other trading activities and that it will deliver a prospectus in connection
with any resale of such Exchange Notes; however, by so acknowledging and by
delivering a prospectus, the undersigned will not be deemed to admit that it is
an "underwriter" within the meaning of the Securities Act.


                       SIGNATURES MUST BE PROVIDED BELOW;
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.

Ladies and Gentlemen:

     Subject to the terms and conditions of the Exchange Offer, the undersigned
hereby tenders to the Company for exchange the principal amount of Outstanding
Notes indicated above. Subject to and effective upon the acceptance for exchange
of the principal amount of Outstanding Notes tendered in accordance with this
Letter of Transmittal, or in accordance with an Agent's Message delivered in
lieu of this Letter of Transmittal, the undersigned hereby exchanges, assigns
and transfers to the Company all right, title and interest in and to the
Outstanding Notes tendered for exchange hereby. The undersigned hereby
irrevocably constitutes and appoints the Exchange Agent the agent and
attorney-in-fact of the undersigned (with full knowledge that the Exchange Agent
also acts as the agent of the Company in connection with the Exchange Offer)
with respect to the tendered Outstanding Notes with full power of substitution
to (i) deliver such Outstanding Notes, or transfer ownership of such Outstanding
Notes on the account books maintained by the Book-Entry Transfer Facility, to
the Company and deliver all accompanying evidences of transfer and authenticity,
and (ii) present such Outstanding Notes for transfer on the books of the Company
and receive all benefits and otherwise exercise all rights of beneficial
ownership of such Outstanding Notes, all in accordance with the terms of the
Exchange Offer. The power of attorney granted in this paragraph shall be deemed
to be irrevocable and coupled with an interest.


                                       -3-

<PAGE>   4



     The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, exchange, assign and transfer the
Outstanding Notes tendered hereby and to acquire the Exchange Notes issuable
upon the exchange of such tendered Outstanding Notes, and that the Company will
acquire good and unencumbered title thereto, free and clear of all liens,
restrictions, charges and encumbrances and not subject to any adverse claim,
when the same are accepted for exchange by the Company.

     The undersigned acknowledge(s) that this Exchange Offer is being made in
reliance upon interpretations contained in no-action letters issued to third
parties by the staff of the Securities and Exchange Commission (the
"Commission"), that the Exchange Notes issued in exchange for the Outstanding
Notes pursuant to the Exchange Offer may be offered for resale, resold and
otherwise transferred by Holders thereof (other than any such Holder that is an
"affiliate" of the Company within the meaning of Rule 405 under the Securities
Act or a broker-dealer who acquired Outstanding Notes from the Company to resell
pursuant to Rule 144 or any other available exemption under the Securities Act),
without compliance with the registration and prospectus delivery provisions of
the Securities Act, provided that such Exchange Notes are acquired in the
ordinary course of such Holders' business and such Holders are not engaging in
and do not intend to engage in a distribution of the Exchange Notes and have no
arrangement or understanding with any person to participate in a distribution of
such Exchange Notes. The undersigned hereby further represent(s) to the Company
that (i) the Outstanding Notes tendered were, and any Exchange Notes acquired in
exchange for Outstanding Notes tendered hereby are being, acquired in the
ordinary course of business of the person receiving such Exchange Notes, whether
or not the undersigned is such person, (ii) neither the undersigned nor any such
other person is engaging in or intends to engage in a distribution of the
Exchange Notes, (iii) neither the undersigned nor any such other person has an
arrangement or understanding with any person to participate in the distribution
of such Exchange Notes, and (iv) neither the Holder nor any such other person is
an "affiliate," as defined in Rule 405 under the Securities Act, of the Company
or, if it is an affiliate, it will comply with the registration and prospectus
delivery requirements of the Securities Act to the extent applicable.

     If the undersigned or the person receiving the Exchange Notes is a
broker-dealer that is receiving Exchange Notes for its own account in exchange
for Outstanding Notes that were acquired as a result of market-making activities
or other trading activities, the undersigned acknowledges that it or such other
person will deliver a prospectus in connection with any resale of such Exchange
Notes; however, by so acknowledging and by delivering a prospectus, the
undersigned will not be deemed to admit that the undersigned or such other
person is an "underwriter" within the meaning of the Securities Act. The
undersigned acknowledges that if the undersigned is participating in the
Exchange Offer for the purpose of distributing the Exchange Notes (i) the
undersigned cannot rely on the position of the staff of the Commission in
certain no-action letters and, in the absence of an exemption therefrom, must
comply with the registration and prospectus delivery requirements of the
Securities Act in connection with a secondary resale transaction of the Exchange
Notes, in which case the registration statement must contain the selling
security holder information required by Item 507 or Item 508, as applicable, of
Regulation S-K of the Commission, and (ii) failure to comply with such
requirements in such instance could result in the undersigned incurring
liability under the Securities Act for which the undersigned is not indemnified
by the Company.

     If the undersigned or the person receiving the Exchange Notes is an
"affiliate" (as defined in Rule 405 under the Securities Act), the undersigned
represents to the Company that the undersigned understands and acknowledges that
the Exchange Notes may not be offered for resale, resold or otherwise
transferred by the undersigned or such other person without registration under
the Securities Act or an exemption therefrom.

     The undersigned will, upon request, execute and deliver any additional
documents deemed by the Exchange Agent or the Company to be necessary or
desirable to complete the exchange, assignment and transfer of the Outstanding
Notes tendered hereby, including the transfer of such Outstanding Notes on the
account books maintained by the Book-Entry Transfer Facility.

     For purposes of the Exchange Offer, the Company shall be deemed to have
accepted for exchange validly tendered Outstanding Notes when, as and if the
Company gives oral or written notice thereof to the Exchange Agent. Any tendered
Outstanding Notes that are not accepted for exchange pursuant to the Exchange
Offer for any reason will be returned, without expense, to the undersigned at
the address shown below or at a different address as may be indicated herein
under "Special Delivery Instructions" as promptly as practicable after the
Expiration Date.



                                       -4-

<PAGE>   5



     All authority conferred or agreed to be conferred by this Letter of
Transmittal shall survive the death, incapacity or dissolution of the
undersigned, and every obligation of the undersigned under this Letter of
Transmittal shall be binding upon the undersigned's heirs, personal
representatives, successors and assigns.

     The undersigned acknowledges that the Company's acceptance of properly
tendered Outstanding Notes pursuant to the procedures described under the
caption "The Exchange Offer -- Procedures for Tendering" in the Prospectus and
in the instructions hereto will constitute a binding agreement between the
undersigned and the Company upon the terms and subject to the conditions of the
Exchange Offer.

     Unless otherwise indicated under "Special Issuance Instructions," please
issue the Exchange Notes issued in exchange for the Outstanding Notes accepted
for exchange and return any Outstanding Notes not tendered or not exchanged, in
the name(s) of the undersigned. Similarly, unless otherwise indicated under
"Special Delivery Instructions," please mail or deliver the Exchange Notes
issued in exchange for the Outstanding Notes accepted for exchange and any
Outstanding Notes not tendered or not exchanged (and accompanying documents, as
appropriate) to the undersigned at the address shown below the undersigned's
signature(s). In the event that both "Special Issuance Instructions" and
"Special Delivery Instructions" are completed, please issue the Exchange Notes
issued in exchange for the Outstanding Notes accepted for exchange in the
name(s) of, and return any Outstanding Notes not tendered or not exchanged to,
the person(s) so indicated. The undersigned recognizes that the Company has no
obligation pursuant to the "Special Issuance Instructions" and "Special Delivery
Instructions" to transfer any Outstanding Notes from the name of the registered
holder(s) thereof if the Company does not accept for exchange any of the
Outstanding Notes so tendered for exchange.



                                       -5-

<PAGE>   6



                                    SIGN HERE
                    (Complete Substitute Form W-9 on Reverse)

_______________________________________________________________________________

_______________________________________________________________________________

                            Signature(s) of Owner(s)
                        (See Guarantee Requirement Below)

Date:_____________

   (Must be signed by the registered Holder(s) exactly as name(s) appear(s) on
Outstanding Notes or on a security position listing or by person(s) authorized
to become registered Holder(s) by a properly completed bond power from the
registered Holder(s), a copy of which must be transmitted with this Letter of
Transmittal. If Outstanding Notes to which this Letter of Transmittal relate are
held of record by two or more joint Holders, then all such Holders must sign
this Letter of Transmittal. If signing by an executor, administrator, trustee,
guardian, attorney-in-fact, agent or other person acting in a fiduciary or
representative capacity, please provide the following information. See
Instruction 6.)
Names(s)_______________________________________________________________________
_______________________________________________________________________________


                                 (Please Print)
   Capacity (full title)_______________________________________________________
   Address     ________________________________________________________________
               ________________________________________________________________
                       (Print Address, Including Zip Code)

  Area Code and Telephone Number ______________________________________________
  Tax Identification or Social Security No_____________________________________
                                       (Complete Substitute Form W-9 on Reverse)



                          MEDALLION SIGNATURE GUARANTEE
                         (IF REQUIRED BY INSTRUCTION 5)

     Certain signatures must be Guaranteed by an Eligible Institution.

Signatures(s) Guaranteed by an Eligible Institution:___________________________
                                                   (Authorized Signature)

_______________________________________________________________________________
                                     (Title)

_______________________________________________________________________________
                                 (Name of Firm)

_______________________________________________________________________________
                           (Address, Include Zip Code)
_______________________________________________________________________________
                         Area Code and Telephone Number)

       Dated:______________________________________________________, 1998




                                       -6-

<PAGE>   7





                              SPECIAL INSTRUCTIONS
                           (SEE INSTRUCTIONS 5 AND 6)


<TABLE>
<CAPTION>
- ----------------------------------------------------               ------------------------------------------------
                 Box A: SPECIAL ISSUANCE                                         Box B: SPECIAL DELIVERY
                      INSTRUCTIONS                                                     INSTRUCTIONS

<S>                                                               <C>
    To be completed ONLY (i) if Outstanding Notes in                       To be completed ONLY if Outstanding
a principal amount not tendered, or Exchange Notes                Notes in a principal amount not tendered, or
issued in exchange for Outstanding Notes accepted for             Exchange Notes issued in exchange for
exchange, are to be issued in the name of someone other           Outstanding Notes accepted for exchange, are to be
than the undersigned, or (ii) if Outstanding Notes                mailed or delivered to someone other than the
tendered by  book-entry transfer which are not                    undersigned, or to the undersigned at an address
exchanged are to be returned by credit to an account              other than that shown below the undersigned's
maintained by at the Book-Entry Transfer Facility.                signature

Issue Exchange Notes and/or Outstanding Notes to:                 Mail to:

                                                                  Name:
Name:                                                                  --------------------------------------------
     -----------------------------------------------                                   (Print Name)
                  (Print Name)
                                                                  Address:
Address:                                                                  -----------------------------------------
        --------------------------------------------
                                                                  -------------------------------------------------
- ----------------------------------------------------                       (Print Address, Including Zip Code)
       (Print Address, Including Zip Code)                        [ ]  Check ONLY if the address above is a new 
                                                                       permanent address.

- ----------------------------------------------------
     (Tax Identification or Social Security Number)                   (Attach Separate Signed Schedule if Necessary)
             (Complete Substitute Form W-9)

      (Attach Separate Signed Schedule if Necessary)
- ----------------------------------------------------               ------------------------------------------------
</TABLE>


[ ] Credit unexchanged Outstanding Notes delivered by book-entry transfer to the
Book-Entry Transfer Facility set forth below:

     ------------------------------------------------------------
     (Book-Entry Transfer Facility Account Number, if applicable)

     INSTRUCTIONS FORMING PART OF THE TERMS AND CONDITIONS OF THE EXCHANGE  
     OFFER.

     1. DELIVERY OF THIS LETTER OF TRANSMITTAL AND OUTSTANDING NOTES OR
BOOK-ENTRY CONFIRMATIONS. All physically delivered Outstanding Notes or any
confirmation of a book-entry transfer to the Exchange Agent's account at the
Book-Entry Transfer Facility of Outstanding Notes tendered by book-entry
transfer (a "Book-Entry Confirmation"), as well as a properly completed and duly
executed copy of this Letter of Transmittal or facsimile hereof, or delivery of
an Agent's Message in lieu of this Letter of Transmittal, and any other
documents required by this Letter of Transmittal, must be received by the
Exchange Agent at its address set forth herein prior to 5:00 p.m., New York
time, on the Expiration Date. The method of delivery of the tendered Outstanding
Notes, this Letter of Transmittal and all other required documents to the
Exchange Agent is at the election and risk of the Holder and, except as
otherwise provided below, the delivery will be deemed made only when actually
received or confirmed by the Exchange Agent. Instead of delivery by mail, it is
recommended that the Holder use an overnight or hand delivery service. In all
cases, sufficient time should be allowed to assure delivery to the Exchange
Agent before the Expiration Date. No Letter of Transmittal or Outstanding Notes
should be sent to the Company.

     2. GUARANTEED DELIVERY PROCEDURES. Holders who wish to tender their
Outstanding Notes and (a) whose Outstanding Notes are not immediately available,
or (b) who cannot deliver their Outstanding Notes, this Letter of Transmittal or
any other documents required hereby to the Exchange Agent prior to the
Expiration Date, or (c) who are unable to complete the procedure for book-entry
transfer on a timely basis, must tender their Outstanding Notes according to the
guaranteed


                                       -7-

<PAGE>   8



delivery procedures set forth in the Prospectus. Pursuant to such procedures:
(i) such tender must be made by or through a firm which is a member of a
registered national securities exchange or of the National Association of
Securities Dealers Inc. or a commercial bank or a trust company having an office
or correspondent in the United States (an "Eligible Institution"); (ii) prior to
the Expiration Date, the Exchange Agent must have received from the Eligible
Institution a properly completed and duly executed Notice of Guaranteed Delivery
(by facsimile transmission, mail or hand delivery) setting forth the name and
address of the Holder of the Outstanding Notes, the registration number(s) of
such Outstanding Notes and the principal amount of Outstanding Notes tendered,
stating that the tender is being made thereby and guaranteeing that, within
three (3) New York Stock Exchange, Inc. ("NYSE") trading days after the
Expiration Date, this Letter of Transmittal (or facsimile hereof) together with
the Outstanding Notes (or a Book-Entry Confirmation) in proper form for
transfer, will be received by the Exchange Agent; and (iii) the certificates for
all physically tendered shares of Outstanding Notes, in proper form for
transfer, or Book-Entry Confirmation, as the case may be, and all other
documents required by this Letter must be received by the Exchange Agent within
three (3) NYSE trading days after the date of execution of the Notice of
Guaranteed Delivery.

     Any Holder of Outstanding Notes who wishes to tender Outstanding Notes
pursuant to the guaranteed delivery procedures described above must ensure that
the Exchange Agent receives the Notice of Guaranteed Delivery prior to 12:00
midnight, New York time, on the Expiration Date. Upon request of the Exchange
Agent, a Notice of Guaranteed Delivery will be sent to Holders who wish to
tender their Outstanding Notes according to the guaranteed delivery procedures
set forth above. See "The Exchange Offer -- Guaranteed Delivery Procedures"
section of the Prospectus.

     3. TENDER BY HOLDER. Only a Holder of Outstanding Notes may tender such
Outstanding Notes in the Exchange Offer. Any beneficial Holder of Outstanding
Notes who is not the registered Holder and who wishes to tender should arrange
with the registered Holder to execute and deliver this Letter of Transmittal on
his behalf or must, prior to completing and executing this Letter of Transmittal
and delivering his Outstanding Notes, either make appropriate arrangements to
register ownership of the Outstanding Notes in such Holder's name or obtain a
properly completed bond power from the registered Holder.

     4. PARTIAL TENDERS. Tenders of Outstanding Notes will be accepted only in
integral multiples of $1,000. If less than the entire principal amount of any
Outstanding Notes is tendered, the tendering Holder should fill in the principal
amount tendered in the second column of the box entitled "Description of
Outstanding Notes Tendered" above. The entire principal amount of Outstanding
Notes delivered to the Exchange Agent will be deemed to have been tendered
unless otherwise indicated. If the entire principal amount of all Outstanding
Notes is not tendered, then Outstanding Notes for the principal amount of
Outstanding Notes not tendered and Exchange Notes issued in exchange for any
Outstanding Notes accepted will be sent to the Holder at his or her registered
address, unless a different address is provided in the appropriate box on this
Letter of Transmittal, promptly after the Outstanding Notes are accepted for
exchange.

     5. SIGNATURES ON THIS LETTER OF TRANSMITTAL; BOND POWERS AND ENDORSEMENTS;
MEDALLION GUARANTEE OF SIGNATURES. If this Letter of Transmittal (or facsimile
hereof) is signed by the record Holder(s) of the Outstanding Notes tendered
hereby, the signature must correspond with the name(s) as written on the face of
the Outstanding Notes without alteration, enlargement or any change whatsoever.
If this Letter of Transmittal is signed by a participant in the Book-Entry
Transfer Facility, the signature must correspond with the name as it appears on
the security position listing as the Holder of the Outstanding Notes.

     If this Letter of Transmittal (or facsimile hereof) is signed by the
registered Holder or Holders of Outstanding Notes listed and tendered hereby and
the Exchange Note(s) issued in exchange therefor are to be issued (or any
untendered principal amount of Outstanding Notes is to be reissued) to the
registered Holder, the said Holder need not and should not endorse any tendered
Outstanding Notes, nor provide a separate bond power. In any other case, such
Holder must either properly endorse the Outstanding Notes tendered or transmit a
properly completed separate bond power with this Letter of Transmittal, with the
signatures on the endorsement or bond power guaranteed by an Eligible
Institution.

     If this Letter of Transmittal (or facsimile hereof) is signed by a person
other than the registered Holder or Holders of any Outstanding Notes listed,
such Outstanding Notes must be endorsed or accompanied by appropriate bond
powers, in each case signed as the name of the registered Holder or Holders
appears on the Outstanding Notes.


                                       -8-

<PAGE>   9



     If this Letter of Transmittal (or facsimile hereof) or any Outstanding
Notes or bond powers are signed by trustees, executors, administrators,
guardians, attorneys-in-fact, or officers of corporations or others acting in a
fiduciary or representative capacity, such persons should so indicate when
signing, and, unless waived by the Company, evidence satisfactory to the Company
of their authority so to act must be submitted with this Letter of Transmittal.

     Endorsements on Outstanding Notes or signatures on bond powers required by
this Instruction 5 must be guaranteed by an Eligible Institution.

     No signature guarantee is required if (i) this Letter of Transmittal is
signed by the registered holder(s) of the Outstanding Notes tendered herewith
(or by a participant in the Book-Entry Transfer Facility whose name appears on a
security position listing as the owner of the tendered Outstanding Notes) and
the issuance of Exchange Notes (and any Outstanding Notes not tendered or not
accepted) are to be issued directly to such registered holder(s) (or, if signed
by a participant in the Book-Entry Transfer Facility, any Exchange Notes or
Outstanding Notes not tendered or not accepted are to be deposited to such
participant's account at such Book-Entry Transfer Facility) and neither the box
entitled "Special Delivery Instructions" nor the box entitled "Special Issuance
Instructions" has been completed, or (ii) such Outstanding Notes are tendered
for the account of an Eligible Institution. In all other cases, all signatures
on this Letter of Transmittal must be guaranteed by an Eligible Institution.

     6. SPECIAL REGISTRATION AND DELIVERY INSTRUCTIONS. Tendering holders should
indicate, in the applicable box or boxes, the name and address (or account at
the Book-Entry Transfer Facility) to which Exchange Notes or substitute
Outstanding Notes for principal amounts not tendered or not accepted for
exchange are to be issued or sent, if different from the name and address of the
person signing this Letter of Transmittal. In the case of issuance in a
different name, the taxpayer identification or social security number of the
person named must also be indicated.

     7. TRANSFER TAXES. The Company will pay all transfer taxes, if any,
applicable to the exchange of Outstanding Notes pursuant to the Exchange Offer.
If, however, Exchange Notes or Outstanding Notes for principal amounts not
tendered or accepted for exchange are to be delivered to, or are to be
registered or issued in the name of, any person other than the registered Holder
of the Outstanding Notes tendered hereby, or if tendered Outstanding Notes are
registered in the name of any person other than the person signing this Letter
of Transmittal, or if a transfer tax is imposed for any reason other than the
exchange of Outstanding Notes pursuant to the Exchange Offer, then the amount of
any such transfer taxes (whether imposed on the registered Holder or any other
persons) will be payable by the tendering Holder. If satisfactory evidence of
payment of such taxes or exemption therefrom is not submitted with this Letter
of Transmittal, the amount of such transfer taxes will be billed directly to
such tendering Holder.

     EXCEPT AS PROVIDED IN THIS INSTRUCTION 7, IT WILL NOT BE NECESSARY FOR
TRANSFER TAX STAMPS TO BE AFFIXED TO THE OUTSTANDING NOTES LISTED IN THIS LETTER
OF TRANSMITTAL.

     8. TAX IDENTIFICATION NUMBER. Federal income tax law requires that a holder
of any Outstanding Notes which are accepted for exchange must provide the
Company (as payor) with its correct taxpayer identification number ("TIN"),
which, in the case of a holder who is an individual, is his or her social
security number. If the Company is not provided with the correct TIN, the Holder
may be subject to a $50 penalty imposed by Internal Revenue Service. (If
withholding results in an over-payment of taxes, a refund may be obtained.)
Certain holders (including, among others, all corporations and certain foreign
individuals) are not subject to these backup withholding and reporting
requirements. See the enclosed "Guidelines for Certification of Taxpayer
Identification Number on Substitute Form W-9" for additional instructions.

     To prevent backup withholding, each tendering holder must provide such
holder's correct TIN by completing the Substitute Form W-9 set forth herein,
certifying that the TIN provided is correct (or that such holder is awaiting a
TIN), and that (i) the holder has not been notified by the Internal Revenue
Service that such holder is subject to backup withholding as a result of failure
to report all interest or dividends or (ii) the Internal Revenue Service has
notified the holder that such holder is no longer subject to backup withholding.
If the Outstanding Notes are registered in more than one name or are not in the
name of the actual owner, see the enclosed "Guidelines for Certification of
Taxpayer Identification Number of Substitute Form W-9" for information on which
TIN to report.



                                       -9-

<PAGE>   10



     The Company reserves the right in its sole discretion to take whatever
steps are necessary to comply with the Company's obligation regarding backup
withholding.

     9. VALIDITY OF TENDERS. All questions as to the validity, form, eligibility
(including time of receipt), and acceptance of tendered Outstanding Notes will
be determined by the Company, in its sole discretion, which determination will
be final and binding. The Company reserves the right to reject any and all
Outstanding Notes not validly tendered or any Outstanding Notes, the Company's
acceptance of which would, in the opinion of the Company or its counsel, be
unlawful. The Company also reserves the right to waive any conditions of the
Exchange Offer or defects or irregularities in tenders of Outstanding Notes as
to any ineligibility of any holder who seeks to tender Outstanding Notes in the
Exchange Offer. The interpretation of the terms and conditions of the Exchange
Offer (which includes this Letter of Transmittal and the instructions hereto) by
the Company shall be final and binding on all parties. Unless waived, any
defects or irregularities in connection with tenders of Outstanding Notes must
be cured within such time as the Company shall determine. The Company will use
reasonable efforts to give notification of defects or irregularities with
respect to tenders of Outstanding Notes, but shall not incur any liability for
failure to give such notification.

     10. WAIVER OF CONDITIONS. The Company reserves the right, in its reasonable
discretion, to waive, in whole or part, any of the conditions to the Exchange
Offer set forth in the Prospectus.

     11. NO CONDITIONAL TENDER. No alternative, conditional, irregular or
contingent tender of Outstanding Notes on transmittal of this Letter of
Transmittal will be accepted.

     12. MUTILATED, LOST, STOLEN, OR DESTROYED OUTSTANDING NOTES. Any Holder
whose Outstanding Notes have been mutilated, lost, stolen or destroyed should
contact the Exchange Agent at the address indicated above for further
instructions.

     13. REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES. Requests for assistance
or for additional copies of the Prospectus or this Letter of Transmittal may be
directed to the Exchange Agent at the address or telephone number set forth on
the cover page of this Letter of Transmittal. Holders may also contact their
broker, dealer, commercial bank, trust company or other nominee for assistance
concerning the Exchange Offer.

     14. ACCEPTANCE OF TENDERED OUTSTANDING NOTES AND ISSUANCE OF EXCHANGE
NOTES; RETURN OF OUTSTANDING NOTES. Subject to the terms and conditions of the
Exchange Offer, the Company will accept for exchange all validly tendered
Outstanding Notes as soon as practicable after the Expiration Date and will
issue Exchange Notes therefor as soon as practicable thereafter. For purposes of
the Exchange Offer, the Company shall be deemed to have accepted tendered
Outstanding Notes when, as and if the Company has given written and oral notice
thereof to the Exchange Agent. If any tendered Outstanding Notes are not
exchanged pursuant to the Exchange Offer for any reason, such unexchanged
Outstanding Notes will be returned, without expense, to the undersigned at the
address shown above (or credited to the undersigned's account at the Book-Entry
Transfer Facility designated above) or at a different address as may be
indicated under the box entitled "Special Delivery Instructions."

     15. WITHDRAWAL. Tenders may be withdrawn only pursuant to the limited
withdrawal rights set forth in the Prospectus under the caption "The Exchange
Offer -- Withdrawal of Tenders."


     IMPORTANT: THIS LETTER OF TRANSMITTAL OR A MANUALLY SIGNED FACSIMILE HEREOF
(TOGETHER WITH THE OUTSTANDING NOTES WHICH MUST BE DELIVERED BY BOOK-ENTRY
TRANSFER OR IN ORIGINAL HARD COPY FORM) OR THE NOTICE OF GUARANTEED DELIVERY
MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO 5:00 P.M. ON THE EXPIRATION
DATE.


                                      -10-

<PAGE>   11




         (TO BE COMPLETED BY ALL TENDERING HOLDERS (SEE INSTRUCTION 5))



<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                       PAYER'S NAME: MGC COMMUNICATIONS, INC.
- -----------------------------------------------------------------------------------------------------------------------
<S>                              <C>                                                            <C>
                                 PART 1 - PLEASE PROVIDE YOUR TIN IN                   Social security number
                                 THE BOX AT RIGHT AND CERTIFY BY
                                 SIGNING AND DATING BELOW.                   OR 
                                                                                -----------------------------------
SUBSTITUTE                                                                         Employer Identification Number
                                 --------------------------------------------------------------------------------------
Form W-9                         PART 2 - Check the box if you are NOT subject to backup withholding under the provisions of
Department of the Treasury       Section 3406(a)(i)(C) of the Internal Revenue Code because (1) you have not been notified
Internal revenue Service         that you are subject to backup withholding as a result of failure to report all interest or 
                                 dividends, or (2) the Internal Revenue Service has notified you that you are no longer subject 
                                 to backup withholding.   -   [ ]
      
                                 --------------------------------------------------------------------------------------
Payer's Request for Taxpayer     CERTIFICATION - UNDER THE PENALTIES OF PERJURY, I              PART 3-
Identification Number ("TIN")    CERTIFY THAT THE INFORMATION PROVIDED ON THIS
                                 FORM IS TRUE, CORRECT AND COMPLETE                             Awaiting TIN   -  [ ]

                                 SIGNATURE                                 DATE
                                          ---------------------------------    -------------

- ------------------------------------------------------------------------------------------------------------------------
</TABLE>

Part 1 - Taxpayer Identification No. - For All Accounts. Enter your taxpayer
identification number in the appropriate box. For most individuals and sole
proprietors, this is your social security number. For other entities, it is your
Employer Identification Number. If you do not have a number, see How to Obtain a
TIN in the enclosed Guidelines. Note: If the account is in more than one name,
see the chart on page 2 of the enclosed Guidelines to determine what number to
enter.

Part 2 - For Payees Exempt from Backup Withholding (see enclosed Guidelines).

     NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP 
WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU WITH RESPECT TO THE EXCHANGE
NOTES.  PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER
IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.

               YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU
               CHECKED THE BOX IN PART 3 OF SUBSTITUTE FORM W-9.


             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER

I certify under penalties of perjury that a taxpayer identification number has
not been issued to me, and either (a) I have mailed or delivered an application
to receive a taxpayer identification number to the appropriate Internal Revenue
Service Center or Social Security Administration Office, or (b) I intend to mail
or deliver an application in the near future. I understand that if I do not
provide a taxpayer identification number within sixty (60) days, 31% of all
reportable payments made to me thereafter will be withheld until I provide a
number.

SIGNATURE_________________________________  DATE _________________
            


                                      -11-




<PAGE>   1
                                  EXHIBIT 99.2

                          NOTICE OF GUARANTEED DELIVERY
                                       FOR
                   TENDER OF 13% SENIOR SECURED NOTES DUE 2004
                                 IN EXCHANGE FOR
              13% REGISTERED SERIES B SENIOR SECURED NOTES DUE 2004


                            MGC COMMUNICATIONS, INC.

         This form or one substantially equivalent hereto must be used by a
holder to accept the Exchange Offer of MGC Communications, Inc., a Nevada
corporation (the "Company"), who wishes to tender 10 1/2% Senior Secured Notes
due 2001 (the "Outstanding Notes") to the Exchange Agent pursuant to the
guaranteed delivery procedures described in "The Exchange Offer -- Guaranteed
Delivery Procedures" of the Company's Prospectus, dated , 1997 (the
"Prospectus") and in Instruction 2 to the related Letter of Transmittal. Any
holder who wishes to tender Outstanding Notes pursuant to such guaranteed
delivery procedures must ensure that the Exchange Agent receives this Notice of
Guaranteed Delivery and a duly executed Letter of Transmittal prior to the
Expiration Date (as defined below) of the Exchange Offer. Capitalized terms used
but not defined herein have the meanings ascribed to them in the Prospectus or
the Letter of Transmittal.

         THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK TIME, ON , 1997,
UNLESS EXTENDED (THE "EXPIRATION DATE"). OUTSTANDING NOTES TENDERED IN THE
EXCHANGE OFFER MAY BE WITHDRAWN AT ANY TIME PRIOR TO THE EXPIRATION DATE.

The Exchange Agent for the Exchange Offer is:  The Marine Midland Bank



<TABLE>
<CAPTION>
By Hand/Overnight Courier:         By Mail:                                By Facsimile:
- --------------------------         --------                                -------------
<S>                                <C>                                     <C>   
140 Broadway                       140 Broadway                            (212) 658-6425
New York, NY 10005-1180            New York, NY 10005-1180                 Confirm by Telephone:(212) 658-6433
Attention Corporate Trust          Attention Corporate Trust Operations    (For Eligible Institutions Only)
Operations
</TABLE>



         DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS OTHER THAN
AS SET FORTH ABOVE, OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE OTHER THAN AS
SET FORTH ABOVE, WILL NOT CONSTITUTE A VALID DELIVERY.

         THIS NOTICE OF GUARANTEED DELIVERY IS NOT TO BE USED TO GUARANTEE
SIGNATURES. IF A SIGNATURE ON A LETTER OF TRANSMITTAL IS REQUIRED TO BE
GUARANTEED BY AN "ELIGIBLE INSTITUTION" UNDER THE INSTRUCTIONS THERETO, SUCH
SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE SPACE PROVIDED ON THE LETTER
OF TRANSMITTAL FOR GUARANTEE OF SIGNATURES.


                                       -1-

<PAGE>   2



         Ladies and Gentlemen:

         The undersigned hereby tenders to the Company, upon the terms and
subject to the conditions set forth in the Prospectus and the related Letter of
Transmittal, receipt of which is hereby acknowledged, the principal amount of
Outstanding Notes set forth below pursuant to the guaranteed delivery procedures
set forth in the Prospectus and in Instruction 2 of the Letter of Transmittal.

         The undersigned hereby tenders the Outstanding Notes listed below:



<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------
DESCRIPTION OF OUTSTANDING NOTES TENDERED


                                                                                 Aggregate            Certificate
Name(s) and Address(es) of Registered Holder(s)                                  Principal Amount     Numbers
- ---------------------------------------------------------------------------------------------------------------------
<S>                                                                              <C>                  <C> 









- ---------------------------------------------------------------------------------------------------------------------
Attach separate schedule if necessary
- ---------------------------------------------------------------------------------------------------------------------
</TABLE>


                            PLEASE SIGN AND COMPLETE

<TABLE>
<S>                                                                    <C>
                                                                       Date:
                                                                            -------------
Signature(s) of Registered Holder(s) or Authorized Signatory:          Name(s) of Registered Holder(s):

- -------------------------------------------                            ----------------------------------

- -------------------------------------------                            ----------------------------------

- -------------------------------------------                            ----------------------------------

Address:

- -------------------------------------------

- -------------------------------------------                            Area Code and Telephone No:

- -------------------------------------------                            ------------------------
             (Include Zip Code)
</TABLE>


         This Notice of Guaranteed Delivery must be signed by the Holder(s)
exactly as their name(s) appear on certificates for Outstanding Notes or on a
security position listing as the owner of Outstanding Notes, or by a person(s)
authorized to become a Holder(s) by endorsements and documents transmitted with
this Notice of Guaranteed Delivery. If signature is by a trustee, executor,
administrator, guardian, attorney-in-fact, officer or other person acting in a
fiduciary or representative capacity, such person must provide the following
information.

<TABLE>
<S>                                                  <C> 
Names(s):                                            Capacity:

- ----------------------------------------             -------------------------------------------------

- ----------------------------------------             -------------------------------------------------

- ----------------------------------------             -------------------------------------------------
                          (Please print name(s) and address(es))
Address(es):

- ---------------------------------------

- ---------------------------------------

- ---------------------------------------
         (Include Zip Code)
</TABLE>


                                       -2-

<PAGE>   3




                                    GUARANTEE
                    (Not to be used for signature guarantee)

         The undersigned, a firm which is a member of a registered national
securities exchange or of the National Association of Securities Dealers, Inc.,
or is a commercial bank or trust company having an office or correspondent in
the United States, or is otherwise an "eligible guarantor institution" within
the meaning of Rule 17Ad-15 under the Securities Exchange Act of 1934,
guarantees deposit with the Exchange Agent of the Letter of Transmittal (or
facsimile thereof), together with the Outstanding Notes tendered hereby in
proper form for transfer (or confirmation of the book-entry transfer of such
Outstanding Notes) into the Exchange Agent's account at the Book-Entry Transfer
Facility described in the Prospectus under the caption "The Exchange Offer --
Guaranteed Delivery Procedures" and in the Letter of Transmittal and any other
required documents, all by 5:00 p.m., New York time, within three (3) New York
Stock Exchange trading days following the Expiration Date.


                  Name of Firm:
                               --------------------------------------------

                  Authorized Signature
                                       ------------------------------------

                  Name:
                       ----------------------------------------------------

                  Title:  
                        ---------------------------------------------------
                                       (Please type or print)
                  Address:  
                          -------------------------------------------------
                                            (Include Zip Code)

                  Area Code and Telephone Number:
                                                 --------------------------

                  Date:                        , 1998
                        -----------------------

         DO NOT SEND OUTSTANDING NOTES WITH THIS FORM. ACTUAL SURRENDER OF
OUTSTANDING NOTES MUST BE MADE PURSUANT TO, AND BE ACCOMPANIED BY A PROPERLY
COMPLETED AND DULY EXECUTED LETTER OF TRANSMITTAL AND ANY OTHER REQUIRED
DOCUMENTS.

         INSTRUCTIONS FOR NOTICE OF GUARANTEED DELIVERY

         1. DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY. A properly completed
and duly executed copy of this Notice of Guaranteed Delivery and any other
documents required by this Notice of Guaranteed Delivery must be received by the
Exchange Agent at its address set forth herein prior to the Expiration Date. The
method of delivery of this Notice of Guaranteed Delivery and any other required
documents to the Exchange Agent is at the election and sole risk of the Holder,
and the delivery will be deemed made only when actually received by the Exchange
Agent. If delivery is by mail, registered mail with return receipt requested,
properly insured, is recommended. As an alternative to delivery by mail, the
Holders may wish to consider using an overnight or hand delivery service. In all
cases, sufficient time should be allowed to assure timely delivery. For a
description of the guaranteed delivery procedures, see Instruction 2 of the
Letter of Transmittal.



                                       -3-

<PAGE>   4


         2. SIGNATURES ON THIS NOTICE OF GUARANTEED DELIVERY. If this Notice of
Guaranteed Delivery is signed by the registered Holder(s) of the Outstanding
Notes referred to herein, the signature must correspond with the name(s) written
on the face of the Outstanding Notes without alteration, enlargement or any
change whatsoever. If this Notice of Guaranteed Delivery is signed by a
participant of the Book-Entry Transfer Facility whose name appears on a security
position listing as the owner of the Outstanding Notes, the signature must
correspond with the name shown on the security position listing as the owner of
the Outstanding Notes. If this Notice of Guaranteed Delivery is signed by a
person other than the registered Holder(s) of any Outstanding Notes listed or a
participant of the Book-Entry Transfer Facility, this Notice of Guaranteed
Delivery must be accompanied by appropriate bond powers, signed as the name of
the registered Holder(s) appears on the Outstanding Notes or signed as the name
of the participant shown on the Book-Entry Transfer Facility's security position
listing. If this Notice of Guaranteed Delivery is signed by a trustee, executor,
administrator, guardian, attorney-in-fact, officer of a corporation, or other
person acting in a fiduciary or representative capacity, such person should so
indicate when signing and submit with the Letter of Transmittal evidence
satisfactory to the Company of such person's authority to so act.

         3. REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES. Questions and requests
for assistance and requests for additional copies of the Prospectus may be
directed to the Exchange Agent at the address specified in the Prospectus.
Holders may also contact their broker, dealer, commercial bank, trust company or
other nominee for assistance concerning the Exchange Offer.



                                       -4-


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