ICG COMMUNICATIONS INC /DE/
S-3, 1999-03-10
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 10, 1999
                                               REGISTRATION NO. 333-        
   ======================================================================
                        SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C. 20549
                                 --------------------
                                       FORM S-3

                                REGISTRATION STATEMENT
                                        UNDER
                              THE SECURITIES ACT OF 1933
                                  --------------------

                               ICG COMMUNICATIONS, INC.
                (Exact name of registrant as specified in its charter)


                  DELAWARE                           84-1342022
           (State or jurisdiction                 (I.R.S. Employer
              of incorporation                   Identification No.)
              or organization)

                                 --------------------
                               161 INVERNESS DRIVE WEST
                              ENGLEWOOD, COLORADO 80112
                                    (303) 414-5000
                     (Address, including zip code, and telephone
                     number, including area code, of registrant's
                             principal executive offices)
                                 --------------------

                                                   with a copy to:
               H. DON TEAGUE, 
          EXECUTIVE VICE PRESIDENT,             AUDREY A. ROHAN, ESQ.
        GENERAL COUNSEL AND SECRETARY         THELEN REID & PRIEST LLP
        C/O ICG COMMUNICATIONS, INC.             40 WEST 57TH STREET
          161 INVERNESS DRIVE WEST            NEW YORK, NEW YORK 10019
          ENGLEWOOD, COLORADO 80112                (212) 603-2000
               (303) 414-5000
(Name, address, including zip code, and telephone         
number, including area code, of agent for service)

               APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE
          PUBLIC:  As soon as practicable after the effective date of this
          Registration Statement.
               If the only securities being registered on this Form are
          being offered pursuant to dividend or interest reinvestment
          plans, please check the following box.  [ ]
                   If any of the securities being registered on this Form are
          to be offered on a delayed or continuous basis pursuant to Rule
          415 under the Securities Act of 1933, other than securities
          offered only in connection with dividend or interest reinvestment
          plans, check the following box.  [X]
               If this Form is filed to register additional securities for
          an offering pursuant to Rule 462(b) under the Securities Act,
          check the following box and list the Securities Act registration
          statement number of the earlier effective registration statement
          for the same offering.  [ ]
               If this Form is a post-effective amendment filed pursuant to
          Rule 462(c) under the Securities Act, check the following box and
          list the  Securities Act registration statement number of the
          earlier effective registration statement for the same offering. [ ]
                         If delivery of the prospectus is expected to be made
          pursuant to Rule 434, please check the following box.  [ ]

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

                           CALCULATION OF REGISTRATION FEE

       ======================================================================

                                       PROPOSED
                                       MAXIMUM
                                       OFFERING      PROPOSED
        TITLE OF EACH     AMOUNT TO   PRICE PER      MAXIMUM
        CLASS OF             BE        SECURITY     AGGREGATE      AMOUNT OF
        SECURITIES TO    REGISTERED     OR PER       OFFERING    REGISTRATION
        BE REGISTERED        (1)      UNIT(2)(3)   PRICE(2)(3)        FEE
       ----------------------------------------------------------------------
       COMMON STOCK,
        $.01 PAR VALUE 
          PER SHARE   .    145,997     $18.1563   $2,650,765.33      $736.91
       ======================================================================

          (1)  Pursuant to Rule 416, this Registration Statement also
               covers such indeterminable additional shares of Common Stock
               as may become issuable as a result of stock dividends, stock
               splits or similar transactions prior to the termination of
               this Registration Statement.
          (2)  Estimated solely for the purpose of calculating the
               registration fee.
          (3)  Calculated pursuant to Rule 457(c), based upon the average
               of the high and low prices of the Common Stock on March 3,
               1999, as reported on the Nasdaq National Market.

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

               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 SECURITIES AND
          EXCHANGE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A), MAY
          DETERMINE.
          =================================================================

          <PAGE>

          Information contained in this prospectus is not complete and may
          be changed.  We may not sell these securities until the
          registration statement filed with the Securities and Exchange
          Commission is effective.  This prospectus is not an offer to sell
          these securities and it is not soliciting an offer to buy these
          securities in any state where the offer or sale is not permitted.

          PROSPECTUS (SUBJECT TO COMPLETION)
          DATED MARCH 10, 1999


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

                               ICG COMMUNICATIONS, INC.
                            145,997 SHARES OF COMMON STOCK


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


               Our common stock is listed on the Nasdaq National Market
          under the symbol "ICGX".  On March 5, 1999, the closing sale
          price of the common stock was $18.875, according to the Nasdaq
          National Market.

               These shares of common stock are being sold by the selling
          stockholders listed on page 19.  All of the shares were
          originally issued by us in connection with our acquisition of
          DataChoice Network Services, L.L.C.  We will not receive any part
          of the proceeds from the sale.

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

                         CONSIDER CAREFULLY THE RISK FACTORS
                       BEGINNING ON PAGE 7 IN THIS PROSPECTUS.

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

                NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY
               STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED
                  OF THESE SECURITIES OR PASSED UPON THE ACCURACY OR
                   ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION
                        TO THE CONTRARY IS A CRIMINAL OFFENSE.
          
                       ---------------------------------------


                                            , 1999


          <PAGE>


          No person has been authorized to provide you with any information
          or to make any representations, other than those contained in
          this prospectus, in connection with the offering made hereby.  If
          such information or representations are made to you, you may not
          rely on them as having been authorized by ICG Communications,
          Inc.  Neither the delivery of this prospectus nor any sale made
          hereunder implies that there has been no change in the affairs of
          ICG Communications since the date of this prospectus.  This
          prospectus is not an offer to sell securities and is not
          soliciting an offer to buy securities in any jurisdiction where
          the offer or sale is not permitted.

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

                                  TABLE OF CONTENTS

                                                                       Page
                                                                       ----

          Where You Can Find More Information . . . . . . . . . . . . .   3
          Forward-Looking Statements  . . . . . . . . . . . . . . . . .   3
          Prospectus Summary  . . . . . . . . . . . . . . . . . . . . .   4
          Risk Factors  . . . . . . . . . . . . . . . . . . . . . . . .   7
          Use of Proceeds . . . . . . . . . . . . . . . . . . . . . . .  19
          Selling Holders . . . . . . . . . . . . . . . . . . . . . . .  19
          Plan of Distribution  . . . . . . . . . . . . . . . . . . . .  20
          Legal Matters . . . . . . . . . . . . . . . . . . . . . . . .  21
          Experts . . . . . . . . . . . . . . . . . . . . . . . . . . .  21

                                      2

          <PAGE>

                                      

                         WHERE YOU CAN FIND MORE INFORMATION

               We file annual, quarterly and special reports, proxy
          statements and other information with the Securities and Exchange
          Commission.  You may read and copy any document we file at the
          SEC's public reference rooms in Washington, D.C., New York, New
          York and Chicago, Illinois.  Please call the SEC at 1-800-SEC-
          0330 for further information on the public reference rooms.  Our
          SEC filings are also available to the public at the SEC's web
          site at http://www.sec.gov.

               The SEC allows us to "incorporate by reference" the
          information we file with it, which means we can disclose
          important information to you by referring you to those documents. 
          The information incorporated by reference is considered to be a
          part of this prospectus, and later information that we file with
          the SEC will automatically update and supersede this information. 
          We incorporate by reference the documents listed below and any
          future filings made with the SEC under Sections 13(a), 13(c), 14
          or 15(d) of the Securities Exchange Act of 1934 until the selling
          stockholders sell all the shares.  This prospectus is a part of a
          registration statement we filed with the SEC.
  
               1.   Proxy Statement on Schedule 14A filed May 6, 1998.
               2.   Annual Report on Form 10-K for the fiscal year ended
                    December 31, 1997.
               3.   Quarterly Report on Form 10-Q for the fiscal quarter
                    ended March 31, 1998.
               4.   Quarterly Report on Form 10-Q for the fiscal quarter
                    ended June 30, 1998.
               5.   Quarterly Report on Form 10-Q for the fiscal quarter
                    ended September 30, 1998.
               6.   Current Report on Form 8-K dated February 5, 1998.
               7.   Current Report on Form 8-K dated February 10, 1998.
               8.   Current Report on Form 8-K dated February 19, 1998.
               9.   Current Report on Form 8-K dated February 26, 1998.
               10.  Current Report on Form 8-K dated April 24, 1998.
               11.  Current Report on Form 8-K dated June 15, 1998.
               12.  Current Report on Form 8-K dated August 6, 1998.
               13.  Current Report on Form 8-K dated November 6, 1998.
               14.  Current Report on Form 8-K dated January 7, 1999.
               15.  Current Report on Form 8-K dated February 26, 1999.
               16.  Current Report on Form 8-K dated March 4, 1999.
               17.  Annual Report of Employee Stock Purchase Plans on Form
                    11-K dated June 30, 1998.
               18.  The description of our common stock contained in our
                    Registration Statement on Form 8-A filed pursuant to
                    Section 12 of the Securities Exchange Act and any
                    amendment or report filed to update this description.

               You may request a copy of these filings, at no cost, by
          writing or telephoning us at the following address:  161
          Inverness Drive West, Englewood, Colorado 80112, Attention: 
          Investor Relations, telephone number (800) 408-4253.

                              FORWARD-LOOKING STATEMENTS

               Some of the statements contained in this prospectus discuss
          our plans and strategies for our business or state other forward-
          looking statements, as this term is defined in the Private
          Securities Litigation Reform Act.  These statements are subject
          to risks and uncertainties and, as a result, actual results may
          differ materially.  For a discussion of important risks of an
          investment in our common stock, including factors that could
          cause actual results to differ materially from results referred
          to in the forward-looking statements, see "Risk Factors."  You
          should carefully consider the information set forth under the
          caption "Risk Factors," including the risks relating to
          historical operating losses and negative cash flows.

                                      3

          <PAGE>

                                  PROSPECTUS SUMMARY

                                     THE COMPANY 

               ICG Communications, through our subsidiary operations, is
          one of the nation's leading competitive integrated communications
          providers ("ICP"), based upon estimates of the industry's 1998
          revenue.  We seek to provide an alternative to incumbent local
          exchange carriers, long distance carriers and other
          communications providers for a full range of communications
          services in the increasingly deregulated telecommunications
          industry.  Through our competitive local exchange carrier
          operations, we operate switched fiber-optic networks in regional
          clusters covering major metropolitan statistical areas in
          California, Colorado, Ohio, Texas and parts of the southeastern
          United States.  Throughout these regions, we offer local, long
          distance, data and enhanced telephony services to business end
          users and design and install copper, fiber and wireless
          infrastructure for buildings and companies.  We also provide a
          wide range of network systems integration services consisting of
          information technology services and selected networking products,
          focusing on network design, installation, maintenance and
          support.

                    Through our subsidiary ICG Satellite Services, Inc. we
          provide maritime and international satellite transmission
          services consisting of satellite voice, data and video services
          to major cruise lines, the U.S. Navy, the offshore oil and gas
          industry and other ICPs.

                    As a complement to the local exchange service offered
          to business end users, we market bundled service offerings which
          include long distance, enhanced telecommunications services and
          data services.  Additionally, we own and operate a nationwide
          data network with approximately 200 points of presence over which
          we have begun providing Internet access and enhanced network
          services targeted to Internet services providers ("ISPs").  The
          design and architecture of our physical network permits us to
          offer highly flexible, reliable high-speed services to our
          customers.  These services are targeted at our existing ISP
          customer and other businesses with substantial data
          communications requirements.

                                 RECENT DEVELOPMENTS

                    In December 1998, we announced our plans to offer new
          wholesale network services beginning in early 1999.  These
          services include Remote Access Service and Expanded Originating
          Service.

                    Remote Access Service and Expanded Originating Service
          are services geared specifically for ISPs.  Remote Access Service
          allows us to provide modem access to ISPs at our own switch
          location rather than requiring ISPs to deploy modems physically
          at their various points of presence.  This service allows us to
          act as an aggregator for ISP traffic, with limited capital
          investment.  We are currently upgrading our switches with a new
          product that allows us to provide Remote Access Service.

                    Through the same technology that allows us to provide
          Remote Access Service, we plan to begin offering Expanded
          Originating Service in 1999.  Expanded Originating Service
          enables regional or local ISPs to expand their geographical
          coverage outside their current physical locations by carrying the
          ISPs' out-of-region traffic on our own data network.


                                      4
          <PAGE>

                    In developing our telecommunications service offerings,
          we continue to invest significant resources to expand our
          network.  This expansion is being undertaken through a
          combination of the following:

                    ( )  constructing our own facilities,
                    ( )  entering into long-term agreements with other
                         telecommunications carriers,
                    ( )  establishing strategic alliances,
                    ( )  mergers and acquisitions and
                    ( )  establishing new operations.

          In addition, to better focus our efforts on our core
          telecommunications services, we have sold certain assets which we
          believe do not complement our overall business strategy.  These
          dispositions include the sale of the capital stock of MarineSat
          Communications Network, Inc. and Nova-Net Communications, Inc.,
          two wholly owned subsidiaries of our Satellite Services
          operation, as well as the sale of certain of the operating assets
          and liabilities of our ISP, NETCOM On-Line Communication
          Services, Inc. ("NETCOM"), now known as ICG PST, Inc.

                                       ADDRESS

                    Our executive offices are located at 161 Inverness
          Drive West, Englewood, Colorado 80112.  Our telephone number is
          (303) 414-5000.
                                      5
          <PAGE>

                                     THE OFFERING

          Common stock offered by selling 
           stockholders . . . . . . . . . . . . . 145,997 shares

          Common stock outstanding as of
           December 31, 1998  . . . . . . . . . . 46,360,185 shares

          Nasdaq National Market symbol . . . . . ICGX

          Use of proceeds . . . . . . . . . . . . We will not receive any
                                                  proceeds from the sale of
                                                  the common stock being
                                                  offered hereby.

          The purpose of this offering is to register the resale of common
          stock received by the selling stockholders in connection with our
          acquisition of DataChoice Network Services in July 1998.  Selling
          stockholders are required to deliver a copy of this prospectus in
          connection with any sale of shares.  The selling stockholders are
          not required to sell their shares of common stock.  Under the
          terms of a registration rights agreement, we have agreed to keep
          this registration statement effective until July 27, 1999,  which
          is the first anniversary of the closing date of our acquisition of
          DataChoice Network Services.


                                     RISK FACTORS

               PROSPECTIVE INVESTORS SHOULD CAREFULLY CONSIDER ALL OF THE
          INFORMATION IN THIS PROSPECTUS AND, IN PARTICULAR, SHOULD
          EVALUATE THE SPECIFIC RISK FACTORS SET FORTH UNDER "RISK FACTORS"
          IMMEDIATELY FOLLOWING THIS SECTION.

                                           6
          <PAGE>

                                     RISK FACTORS

                    An investment in the common stock offered under this
          prospectus involves a high degree of risk.  You should carefully
          consider the following risk factors and the other information in
          this prospectus before deciding to invest in the common stock.

          OUR BUSINESS HAS SUSTAINED HISTORICAL OPERATING LOSSES, NET
          LOSSES AND NEGATIVE OPERATING CASH FLOWS

                    ICG Communications originated as a satellite
          communications company in the mid-1980's.  We subsequently
          entered a niche segment of the local telephone market in 1991 as
          a competitive access provider and began providing competitive
          local exchange services in 1997.  A substantial portion of our
          revenue is derived from local exchange services, special access
          enhanced telecommunications services and long distance services,
          although many of these services have only been offered for a
          short period of time.  Consequently, as an investor, you have
          only a limited history upon which to evaluate our performance.

                    Historically, we have incurred significant operating
          and net losses and negative operating cash flows.  For the 12
          months ended September 30, 1998, we had revenue of approximately
          $347.0 million, an operating loss of approximately $162.3
          million, negative EBITDA of approximately $73.0 million, net cash
          used by operating activities of continuing operations of
          approximately $104.0 million, interest expense of approximately
          $157.2 million and a net loss of approximately $410.4 million. 
          "EBITDA" stands for earnings before interest expense, income
          taxes, depreciation, amortization and certain non-recurring
          costs.  EBITDA is widely used in the telecommunications industry
          as a measure of a company's performance.  We do not anticipate
          that cash provided by operations will be sufficient to fund
          operating activities of continuing operations, the future
          expansion of the existing networks or the construction and
          acquisition of new networks in the near term.

                    The growth of our customer base depends upon the
          successful implementation of our local, long distance, data and
          value-added service strategies.  The growth of our customer base
          also depends upon the continued development and expansion of our
          network infrastructure and increased traffic on our facilities
          and upon actions of competitors and regulatory authorities.  At
          September 30, 1998, we had an accumulated deficit of
          approximately $1.1 billion and a stockholders' deficit of
          approximately $520.1 million.  We cannot assure you that we will
          achieve or sustain profitability or positive operating cash flows
          in the future or at any time have sufficient resources to meet
          our obligations.

          WE ARE SUBJECT TO RISKS RELATED TO LOCAL SERVICES STRATEGIES

                    We entered the competitive local telecommunications
          services industry in 1996, and this market has only recently
          opened to competition due to the passage of the Federal
          Telecommunications Act of 1996 (the "Telecommunications Act"). 
          In addition, we have been providing long distance and data
          communications services for only a short time.  However, we
          believe that offering a full-service portfolio of local, long
          distance, data and value-added products is the best method for
          gaining market share among business customers and reducing
          customer turnover.  We are making significant operating and
          capital investments and will have to address numerous operating
          challenges.  We are currently developing new processing and
          technical support systems and will need to develop new marketing
          initiatives and continue to hire and train a sales force
          responsible for selling our services.  We will also need to
          supplement the billing and collection systems necessary for local
          services and integrate these systems with those of our long
          distance and data services.  We cannot assure you that we can
          design, install and coordinate with the incumbent local exchange
          carriers regarding necessary processing, billing and customer
          management systems in a timely manner to permit us to offer local
          exchange, local toll, long distance and/or data communications
          services as planned.

                                      7

          <PAGE>

                    We expect to face significant competition from the
          incumbent local exchange carriers whose core business is
          providing local dial tone service.  We expect the incumbent
          carriers, who are the current dominant providers of services in
          their markets, to respond aggressively to new entrants such as
          ICG Communications.  We expect to face significant competitive
          product and pricing pressures from the incumbent carriers, as
          well as from other newly-formed local exchange carriers.  In
          addition, with our recent expansion into the long distance
          market, we will face many competitors, including AT&T, MCI
          WorldCom and Sprint.

          OUR FINANCIAL AND OPERATING ACTIVITIES ARE LIMITED BY
          RESTRICTIONS CONTAINED IN THE TERMS OF OUR PRIOR FINANCINGS

                    The terms governing certain of our and our
          subsidiaries' senior indebtedness and preferred securities impose
          significant operating and financial restrictions on us.  These
          restrictions may significantly limit or prohibit us from engaging
          in certain transactions, including the following:
                                                               
                    ( )  incurring additional indebtedness,
                    ( )  creating liens on our assets,
                    ( )  paying dividends,
                    ( )  selling assets,
                         engaging in mergers or acquisitions and
                    ( )  making investments.

          Our failure to comply with these covenants could lead to a
          default under the terms of those documents, which would enable
          the lenders to accelerate the indebtedness and declare all
          amounts owed due and payable.  Moreover, the instruments
          governing our indebtedness contain cross-default provisions that
          provide that a default under other indebtedness will be
          considered a default under the indebtedness in question.  If a
          cross-default occurs, the maturity of almost all of our
          approximately $1.6 billion of indebtedness at September 30, 1998
          would be accelerated and become immediately due and payable.  If
          that happens, we would not be able to satisfy all of our debt
          obligations, which would have a substantial material adverse
          effect on the value of our common stock and our ability to
          continue as a going concern.  We cannot assure you that we will
          be able to comply with these restrictions in the future or that
          our compliance would not cause us to forego opportunities that
          might otherwise be beneficial to us.

          WE MAY NEED TO SECURE ADDITIONAL SOURCES OF CASH TO REPAY OUR
          INDEBTEDNESS

                    We have a significant amount of debt outstanding. As of
          September 30, 1998, we had, on a consolidated basis, aggregate
          indebtedness, including capital lease obligations, of
          approximately $1.6 billion.  With respect to indebtedness
          currently outstanding, we have interest payment obligations of
          approximately $113.3 million in 2001, $158.0 million in 2002 and
          $212.6 million in 2003.  In addition, with respect to the
          currently outstanding preferred securities of our subsidiaries,
          we have cash dividend obligations of approximately $6.7 million
          in 1999, $8.9 million in 2000, $21.5 million in 2001, $57.0
          million in 2002 and $70.9 million in 2003.  Accordingly, we may
          have to refinance a substantial amount of indebtedness and obtain
          substantial additional funds prior to March 2001, when our
          subsidiary, ICG Holdings, Inc., is required to commence cash
          interest payments under its senior indebtedness.  Our ability to
          obtain additional sources of cash will depend on, among other
          things, our financial condition at the time, the restrictions in
          the instruments governing our indebtedness and other factors
          beyond our control, including market conditions.  Additional
          sources of cash may include public and private equity and debt
          financings by us and our subsidiaries, sales of non-strategic
          assets, capital leases and other financing arrangements.  We
          cannot assure you that we will be able to refinance our
          indebtedness, including capitalized leases, or obtain additional
          funds.  If we are unable to refinance our indebtedness or obtain
          additional funds, our ability to make principal and interest
          payments on our indebtedness, our ability to continue as a going
          concern and the price of our common stock would be adversely
          affected.


                                      8

          <PAGE>

          WE MAY NEED SIGNIFICANT ADDITIONAL CAPITAL TO FINANCE OUR GROWTH
          AND CAPITAL REQUIREMENTS

                    We expect that we will need a significant amount of
          capital to expand existing networks, construct new networks and
          further develop our products and services.  We currently estimate
          that our capital expenditure requirements will be approximately
          $380 million in 1999, and we also expect to spend significant
          amounts on expansion and development beyond 1999.  We may need
          additional cash from outside sources, as well, to continue
          funding operating losses.  Further, we have significant personnel
          expenses related to increasing our marketing efforts and offering
          new long distance and data transmission services in anticipation
          of revenue growth.  We also may make strategic acquisitions from
          time to time.  We anticipate that our substantial cash
          requirements will continue into the foreseeable future. 
          Additional sources of cash may include public and private equity
          and debt financings by us and/or our subsidiaries, sales of non-
          strategic assets, capital leases and other financing
          arrangements.  We cannot assure you that additional financing
          will be available to us or, if available, that it can be obtained
          on acceptable terms.  Failure to obtain financing could result in
          the delay or abandonment of some or all of our acquisition,
          development and expansion plans and expenditures, which could
          have a material adverse effect on our business prospects and
          limit our ability to meet our debt service requirements.

          WE CANNOT ASSURE YOU WE WILL EFFECTIVELY MANAGE OUR RAPID GROWTH

                    We have experienced rapid growth and we intend to
          continue to grow through further expansion of our existing
          network service offerings.  This expansion is being undertaken
          through a combination of the following:

                    ( )  constructing owned facilities,
                    ( )  entering into long-term agreements with other
                         telecommunications carriers,
                    ( )  establishing strategic alliances,
                    ( )  mergers and acquisitions, including the
                         acquisitions of NETCOM; CSW/ICG ChoiceCom, L.P.
                         ("ChoiceCom"); DataChoice Network Services;
                         NikoNET, Inc., CompuFAX Acquisition Corp. and
                         Enhanced Messaging Services, Inc. (collectively,
                         "NikoNet"), and
                    ( )  establishing new operations.

                    Our ability to continue to expand and develop our
          business will depend on, among other things, whether we can
          successfully do the following in a timely manner, at reasonable
          costs and on satisfactory terms and conditions:

                    ( )  implement our sales and marketing strategy,
                    ( )  evaluate markets,
                    ( )  acquire and install necessary equipment and
                         facilities,
                    ( )  secure financing and
                    ( )  obtain any required government authorizations.

          In addition, some acquisitions may divert our resources and
          management time and would need to be integrated with our existing
          networks and service offerings.

                    Our ability to manage our anticipated future growth
          will depend on our ability to evaluate new markets and
          investments, monitor operations, control costs, maintain
          effective quality controls and significantly expand our internal
          management, technical and accounting systems.  Our rapid growth
          has placed, and may in the future place, a significant strain on
          our business resources.  In addition, our ability to acquire and
          establish new operations would require us to spend considerable
          amounts before we generate related revenue.

                                      9

          <PAGE>

                    In addition, our acquired and new businesses will need
          to be integrated with our existing operations.  For acquired
          businesses, including ChoiceCom, DataChoice Network Services and
          NikoNet, this may entail, among other things, integration of
          operational and administrative systems, hardware and software,
          some or all of which may be incompatible.  Our failure to
          effectively integrate acquired businesses could have a material
          adverse effect on our business, growth, financial condition and
          results of operations and the price of our common stock.

          THE TELECOMMUNICATIONS INDUSTRY IS HIGHLY COMPETITIVE 

                    We operate in an increasingly competitive environment. 
          Our current competitors include:

                    ( )  incumbent local exchange carriers, such as the
                         regional Bell operating companies and GTE
                         Corporation,
                    ( )  other newly-formed competitive local exchange
                         carriers,
                    ( )  other integrated communications providers,
                    ( )  cable television providers, such as Time Warner
                         Communications, Inc.,
                    ( )  network systems integration service providers,
                    ( )  microwave and satellite service providers,
                    ( )  teleport operators,
                    ( )  wireless telecommunications providers,
                    ( )  private networks of large end users,
                    ( )  local and regional system integrators and
                    ( )  maritime telecommunications providers, such as
                         COMSAT Corporation.

                    Potential competitors, using similar or different
          technology, include ISPs, utilities, incumbent local exchange
          carriers outside their current local service areas and the local
          access operations of long distance carriers.  The trend toward
          business combinations and strategic alliances within the
          telecommunications industry could give rise to increased
          competition.  In addition, the development of new technologies
          could also give rise to increased competition.  One of the
          primary purposes of the Telecommunications Act is to promote
          competition, particularly in the local telephone market.  Since
          the enactment of the Telecommunications Act, several
          telecommunications companies have indicated their intention to
          aggressively expand their ability to address many segments of the
          telecommunications industry, including segments in which we
          participate and expect to participate.  This may result in more
          participants than can ultimately be successful in a given market.

                    We also expect that increased local competition will
          result in competitive pricing by the incumbent local exchange
          carriers.  Some of the competitive local exchange carriers with
          which we compete are affiliated with major long distance
          carriers.  Because providing local exchange services requires a
          company to spend a significant amount of money upon entering the
          local exchange business, companies which have the resources to
          sustain losses for some time, such as those affiliated with major
          long distance carriers, have an advantage over those companies
          without access to these resources.  Increased local competition
          could also result in less regulation of the incumbent carriers. 
          If the incumbent carriers are permitted to engage in discount
          pricing practices or charge the competitive local exchange
          carriers increased fees for interconnection to their networks, or
          if the incumbent carriers seek to delay implementation of
          interconnection to their networks, our business could be
          adversely affected.  We cannot assure you that we will be able to
          achieve or maintain adequate market share or revenue or compete
          effectively in any of our markets.  Any of the foregoing factors
          could result in a material decline of the price of our common
          stock.

                    As a recent entrant into the wholesale network services
          sector, we face competition from existing providers of our
          planned services, primarily UUNet Technologies, Inc. and, once
          its network has been sufficiently developed, Level 3
          Communications, Inc.  Competition will also come from GTE, Sprint
          and the regional Bell operating companies that currently offer
          similar wholesale network service products to ISPs.  We cannot

                                     10

          <PAGE>

          assure you that sufficient demand will exist for our wholesale
          network services in our selected markets, that market prices will
          not dramatically decline or that we will be successful in
          executing our strategy profitably or at all.

          REGULATORY RISKS ARE INHERENT AND SUBSTANTIAL IN OUR BUSINESS

                    Our services are subject to significant federal, state
          and local regulation.  Our telecom services are regulated by the
          Federal Communications Commission ("FCC"), state regulatory
          agencies and municipalities.  Our satellite services activities
          are regulated by the FCC and international regulatory bodies. 
          The FCC regulates our provision of interstate and international
          common carrier services.  State regulatory agencies regulate our
          provision of local dial tone and other intrastate common carrier
          services.  We currently file and maintain tariffs with the FCC as
          well as the state regulatory agencies.

                    The FCC and state regulatory agencies are charged with
          implementing the Telecommunications Act, which opened the local
          and long distance markets to additional competition, and has had
          a substantial impact on our local exchange business.  In general,
          the Telecommunications Act requires incumbent local exchange
          carriers to negotiate agreements to provide interconnection and
          nondiscriminatory access to their networks.  However, these
          negotiations may involve considerable delay and do not always
          result in rates, terms and conditions that are desirable to us. 
          In these instances, we may petition the proper state regulatory
          agency to arbitrate disputes and ultimately seek review by the
          federal courts.  We are currently in the process of renegotiating
          and extending the terms of certain of our interconnection
          agreements.  We cannot assure you that we will be able to
          negotiate and/or arbitrate acceptable new interconnection
          agreements.

                    In August 1996, the FCC adopted rules and policies
          implementing the interconnection provisions of the
          Telecommunications Act.  These rules, in general, are favorable
          to new competitive entrants.  The FCC's rules were successfully
          challenged in the federal court of appeals by the incumbent local
          exchange carriers and state regulatory commissions.  In January
          1999, the U.S. Supreme Court largely reversed the appellate court
          and reestablished the validity of many of the FCC's
          interconnection rules, including the FCC's jurisdiction to adopt
          pricing guidelines for interconnection, unbundled network
          elements and resale services.  The Supreme Court did not,
          however, evaluate the specific pricing methodologies adopted by
          the FCC, and the appellate court will further consider those
          methodologies.  Other FCC rules upheld by the Supreme Court
          include the "pick and choose" rules, which allow carriers to
          adopt individual rates and provisions of incumbent
          interconnection agreements.  However, the Supreme Court vacated
          the FCC rule identifying the unbundled network elements that must
          be made available by the incumbent carriers.  The Court held that
          the FCC must provide a stronger rationale to support the degree
          of unbundling ordered.  We view the Supreme Court decision as a
          favorable development, although we cannot predict the ultimate
          outcome of the further FCC and court proceedings resulting from
          the decision.

                    The FCC and relevant state public utilities commissions
          have the authority to regulate interstate and intrastate
          telephone rates, respectively, and the terms and conditions under
          which some of our services are provided, although, in general,
          neither the FCC nor the relevant state public utilities
          commission currently regulate our long distance rates or profit
          levels.  Federal and state regulations and regulatory trends in
          the direction of reduced regulation have had, and are likely to
          have, both positive and negative effects on us and our ability to
          compete.  We cannot assure you that changes in current or future
          state or federal regulations, or increased competitive
          opportunities resulting from such changes, will not have a
          material adverse effect on our business and on the price of our
          common stock.  

                    We have recorded revenue of approximately $4.9 million
          in 1997 and $32.9 million for the nine months ended September 30,
          1998 for reciprocal compensation relating to the transport and
          termination of local traffic to ISPs from customers of incumbent
          local exchange carriers under various interconnection agreements. 
          The incumbent carriers have not paid most of the bills they have

                                     11
          <PAGE>

          received from us and have disputed substantially all of these
          charges based on the belief that such calls are not local traffic
          as defined by the various agreements and under state and federal
          laws and public policies.  As a result, we expect that reciprocal
          compensation receivables will continue to increase until these
          disputes are resolved.

                    The resolution of these disputes will be based on
          rulings by state public utility commissions and/or by the FCC and
          the courts which may review these rulings.  To date, there have
          been favorable final rulings from 29 states and no unfavorable
          rulings by any state public utility commission or reviewing court
          that would indicate that calls placed by end users to ISPs are
          not subject to reciprocal compensation payments.  On February 25,
          1999, the FCC issued a decision that ISP-bound traffic is largely
          jurisdictionally interstate traffic.  The decision emphasizes the
          long-standing federal policy that ISP traffic, although
          jurisdictionally interstate, is treated as though it is local
          traffic for pricing purposes.  The decision also emphasizes that,
          because there are no federal rules governing inter-carrier
          compensation for ISP traffic, the determination as to whether
          this traffic is subject to reciprocal compensation under the
          terms of carrier interconnection agreements properly is made by
          the state commissions.  The FCC's decision confirms that carriers
          are bound by their interconnection agreements and state
          commission decisions mandating the payment of reciprocal
          compensation for ISP traffic.  The FCC has initiated a rulemaking
          proceeding for the adoption of prospective federal rules for
          inter-carrier compensation for ISP traffic.  In its notice of
          rulemaking, the FCC expressed its preference that compensation
          rates for this traffic continue to be set by commercial
          negotiations between carriers, with disputes resolved by
          arbitrations conducted by state commissions.

                    While we believe that all revenue recorded through
          September 30, 1998 is collectible and that future revenue from 
          transport and termination charges billed under our current
          interconnection agreements will be realized, we cannot assure you
          that future regulatory and court rulings will be favorable to us,
          or that different pricing plans for transport and termination
          charges between carriers will not be considered when our
          interconnection agreements are renegotiated, beginning in 1999,
          or as a result of the FCC's rulemaking proceeding on future
          compensation methods.

                    We recently began offering voice telephony services
          over an Internet protocol ("IP") based network.  We carry the IP
          traffic over our data network and terminate a large portion via
          our own points of presence.  The regulatory status of voice
          telephony services over the Internet is uncertain at this time. 
          The extent to which current state and federal laws and
          regulations governing telecommunications services will be
          interpreted to include IP telephony services has not been
          determined.  We cannot assure you that new laws or regulations,
          or the application by regulators of existing laws and regulations
          to this service, will not have an adverse effect on our provision
          of this service.

          THERE ARE SIGNIFICANT RISKS OF ENTRY INTO THE LONG DISTANCE
          BUSINESS

                    Although we have extensive experience in the
          telecommunications business, including an executive team with
          sales, marketing and long distance management expertise, we have
          limited experience providing long distance services.  The long
          distance business is extremely competitive and prices have
          declined substantially in recent years and are expected to
          continue to decline.  We do not expect long distance services to
          generate a material portion of our revenues over the near term.

                    Although our owned switches have reduced the cost of
          obtaining long distance transmission capacity, we still rely on
          other carriers to provide transmission services for our long
          distance traffic and will therefore be dependent on these
          carriers.  We have entered into agreements with long distance
          carriers to provide us with long distance transmission services. 
          These agreements typically provide for the resale of long
          distance services on a per minute basis (some with minimum volume
          commitments).  Where we anticipate higher volumes of traffic, we
          may lease facilities on a fixed cost basis.  In negotiating these
          agreements, we may estimate future supply and demand for our long
          distance transmission capacity.  If we fail to meet our minimum
          volume commitments, if any, under these agreements, then we may

                                     12
          <PAGE>

          be obligated to pay penalties.  Likewise, if we underestimate our
          need for long distance facilities, we may then be required to
          obtain the necessary transmission capacity through more expensive
          means.  We cannot assure you that we will acquire long distance
          capacity on favorable terms or that we can accurately predict
          long distance prices and volumes so that we can operate
          profitably.
   
                    The success of our entry into the long distance
          business will depend upon, among other things, the acceptance of
          potential customers of our long distance service offerings and
          our ability to select new equipment and software and integrate
          them into our networks, hire and train qualified personnel and
          enhance our billing, back-office and information systems to
          accommodate long distance services.  If our long distance
          transmission business fails to be profitable or if we fail in any
          of these respects, this failure may have a material adverse
          effect on our business and the price of the common stock.  In
          addition, some of our telecommunications services revenue is
          derived from long distance carrier customers, and there is a risk
          that our entry into the long distance business will adversely
          affect our relationship with our long distance carrier customers.

          THERE ARE SIGNIFICANT RISKS OF ENTRY INTO DATA TRANSMISSION
          BUSINESS

                    We have been providing data transmission services since
          1997.  We own and operate a data communications network
          consisting of approximately 200 points of presence and 15 hubs. 
          However, the data transmission business is extremely competitive
          and prices have declined substantially in recent years and are
          expected to continue to decline.  In providing data transmission
          services, we will depend upon vendors for assistance in the
          planning and deployment of our initial data product offerings as
          well as ongoing training and support.  The success of our entry
          into the data transmission business will depend upon, among other
          things, the following factors: 

                    ( )  customer acceptance of our data services,
                    ( )  our ability to select new equipment and software
                         and integrate them into our networks,
                    ( )  our ability to hire and train qualified sales and
                         processing personnel and
                    ( )  our ability to enhance our billing, back-office
                         and information systems to accommodate data
                         services.

          We cannot assure you that we will be successful in achieving
          these factors and, if not, there may be a material adverse effect
          on our business and the price of our common stock.

          WE ARE DEPENDENT ON OUR BILLING, CUSTOMER SERVICE AND INFORMATION
          SYSTEMS

                    Sophisticated information and processing systems are
          vital to our growth and our ability to monitor costs, bill
          customers, process customer orders and achieve operating
          efficiencies.  Billing and information systems for our historical
          lines of business have been produced largely in-house with
          partial reliance on outside vendors.  These systems have
          generally met our needs due in part to our low volume of bills
          and orders.  However, as we continue providing local, long
          distance and data transmission services, we will need more
          sophisticated billing and information systems.  Our current local
          billing platform plans rely on products and services provided by
          outside vendors.  Additionally, we are developing automated
          systems and customer service centers to process orders. 
          Information systems are vital to the success of these centers,
          and the information systems for these centers are being developed
          largely by outside vendors.  The failure of our vendors to
          deliver products and services in a timely and effective manner,
          our failure to adequately identify all of our information and
          processing needs or our failure to upgrade systems as necessary
          could each have a material adverse impact on our business.  See
          "Our operations could be adversely affected by data processing
          failures after December 31, 1999."


                                     13
          <PAGE>

          THERE ARE RISKS INVOLVED IN JOINT VENTURES AND STRATEGIC
          ALLIANCES

                    We have formed and may in the future form various
          strategic alliances, joint ventures and other similar
          arrangements to lease fiber optic facilities.  The other parties
          to these existing or future arrangements, however, may at times
          have economic, business or legal interests or goals that are
          inconsistent with those of the strategic alliance, joint venture
          or similar arrangement or those of ICG Communications.  In
          addition, a joint venture partner may be unable to meet its
          economic or other obligations to the venture.  A disagreement
          with our strategic allies or joint venture partners over certain
          business actions or the failure of a partner to meet its
          obligations to the venture could adversely affect our business
          and the price of our common stock.

          RAPID TECHNOLOGICAL CHANGE MAY AFFECT OUR INDUSTRY

                    We cannot predict the effect of technological changes,
          including changes in emerging wireline and wireless transmission
          technologies, on our business.  We cannot assure you that
          technological developments in telecommunications will not have a
          material adverse effect on our business and financial condition.

          WE ARE DEPENDENT ON RIGHTS OF WAY AND OTHER THIRD PARTY
          AGREEMENTS

                    In order to construct and maintain fiber optic
          networks, we must reach agreements with various private parties,
          including actual and potential competitors, and local governments
          to obtain the rights of way necessary for this access.  We cannot
          assure you that we will obtain rights of way agreements to expand
          our networks or that these agreements will be on terms acceptable
          to us.  Additionally, we cannot assure you that current or
          potential competitors will not obtain similar rights of way
          agreements.  Because some of these agreements are short-term or
          are terminable at any time, we cannot assure you that we will
          continue to have access to existing rights of way in the future.

                    An important element of our strategy is to enter into
          long-term agreements with utilities to take advantage of their
          existing facilities and utilize their excess fiber capacity. 
          However, other telecommunications providers are seeking to enter
          into similar arrangements and have bid, and are expected to
          continue to bid, against us to use these facilities in the
          future.  Furthermore, utilities are required by state or local
          regulators to retain the right to "reclaim" fiber we may be using
          if this fiber is needed for the utility's core business.  We
          cannot assure you that we will be able to obtain additional
          agreements to use these facilities on satisfactory terms or that
          such arrangements will not be subject to reclamation.  If an
          agreement was terminated and we were forced to remove or abandon
          a significant portion of our network, this termination could have
          a material adverse effect on us and the price of our common
          stock.

          OUR SUCCESS DEPENDS UPON OUR ABILITY TO ATTRACT AND RETAIN KEY
          PERSONNEL

                    The efforts of a small number of key management and
          operating personnel will largely determine our success because of
          our lean senior management structure.  Our success also depends
          in part upon our ability to hire and retain highly skilled and
          qualified operating, marketing, financial and technical
          personnel.  The competition for qualified personnel in the
          telecommunications services industry is intense and, accordingly,
          we cannot assure you that we will be able to hire or retain
          necessary personnel.  If we lose the services of certain key
          personnel or if we are unable to attract additional qualified
          personnel, our business and the price of our common stock could
          be materially and adversely affected.

                                     14

          <PAGE>

          WE DO NOT ANTICIPATE PAYING CASH DIVIDENDS ON OUR COMMON STOCK

                    We do not expect to generate net income from continuing
          operations in the near future and, therefore, we do not
          anticipate paying cash dividends on our common stock.  The
          indentures for certain of our subsidiaries' senior indebtedness
          effectively prohibit the payment of any future dividends on our
          common stock.

          THE MARKET PRICE OF OUR COMMON STOCK HAS BEEN AND MAY BE VOLATILE

                    The market price of our common stock has been, and may
          continue to be, highly volatile.  The following factors, among
          others, may cause the price of our common stock to fluctuate:

                    ( )  legislation or regulation,
                    ( )  variations in our revenue, net losses and cash
                         flows,
                    ( )  the difference between our actual results and the
                         results expected by investors and analysts,
                    ( )  announcements of new service offerings, marketing
                         plans or price reductions by us or our
                         competitors,
                    ( )  technological innovations and
                    ( )  mergers and acquisitions or strategic alliances.

                    In addition, the stock markets recently have
          experienced significant price and volume fluctuations that have
          affected growth companies such as telecommunications companies. 
          The fluctuations in the market prices of the stocks of many
          companies have not been directly related to the operating
          performance of those companies.  These market fluctuations may
          materially adversely affect the price of our common stock.

          THE PRICE OF OUR COMMON STOCK MAY DECLINE DUE TO THE POSSIBLE
          SALES OF SHARES ELIGIBLE FOR FUTURE SALE

                    As of December 31, 1998, there were 46,360,185 shares
          of our common stock outstanding, all of which are transferable
          without restriction or further registration under the Securities
          Act of 1933, except for any shares of common stock held by our
          affiliates.  The shares of common stock held by our affiliates
          will be subject to the resale limitations of Rule 144 under the
          Securities Act.  In addition, we have reserved and registered
          under the Securities Act the following 16,549,207 shares of
          common stock for future issuance:

                    ( )  1,852,290 shares of common stock issuable pursuant
                         to outstanding warrants which have an exercise
                         price of $12.51,
                    ( )  6,651,577 shares of common stock issuable pursuant
                         to outstanding options, with exercise prices
                         ranging from $2.60 to $46.65 per share,
                    ( )  256,810 shares of common stock reserved for
                         issuance under our 401(k) Plan,
                    ( )  811,671 shares of common stock reserved for
                         issuance pursuant to our 1996 Employee Stock
                         Purchase Plan,
                    ( )  313,639 shares of common stock reserved for
                         issuance under the 1996 Stock Option Plan,
                    ( )  1,155,165 shares of common stock reserved for
                         issuance under the 1998 Stock Option Plan,
                    ( )  5,504,682 shares of our common stock issuable
                         pursuant to outstanding 6.75% convertible
                         preferred securities and
                    ( )  3,373 shares of our common stock issuable upon
                         conversion of the interest on 7% convertible
                         subordinated notes.

                    In addition, we may issue common stock to our
          subsidiary, ICG Funding, LLC, which may sell the common stock to
          fund dividends on its preferred securities.   Sales or the

                                     15
          <PAGE>


          expectation of sales of a substantial amount of our common stock
          in the public market could cause the prevailing market price for
          our common stock to decline materially.

          ANTI-TAKEOVER PROVISIONS LIMIT THE ABILITY OF STOCKHOLDERS TO
          EFFECT A CHANGE IN CONTROL OF ICG COMMUNICATIONS

                    Certain provisions of our Certificate of Incorporation
          and the corporate charters and debt instruments of our
          subsidiaries may have the effect of deterring transactions
          involving a change in control of ICG Communications, including
          transactions in which stockholders might receive a premium for
          their shares.  Our Certificate of Incorporation provides that
          directors serve staggered three-year terms and authorizes the
          issuance of up to 1,000,000 shares of preferred stock with such
          designations, rights and preferences as may be determined from
          time to time by our board of directors.

                    The staggered board provision increases the likelihood
          that, in the event of a takeover of ICG Communications, incumbent
          directors would retain their positions and, consequently, may
          have the effect of discouraging, delaying or preventing a change
          in control or management of ICG Communications.  The
          authorization of preferred shares empowers the board of
          directors, without further stockholder approval, to issue
          preferred shares with dividend, liquidation, conversion, voting
          or other rights which could adversely affect the voting power or
          other rights of the holders of our common stock.  If issued, the
          preferred stock could be used to discourage, delay or prevent a
          change of control of ICG Communications.  We have no current
          plans to issue any preferred stock.

                    In addition, we are subject to the anti-takeover
          provisions of the Delaware General Corporation Law, which could
          have the effect of delaying or preventing a change of control of
          ICG Communications.  Furthermore, upon a change of control, the
          holders of substantially all of our outstanding indebtedness,
          including preferred securities of our subsidiaries, are entitled
          at their option to be repaid or redeem their securities in cash. 
          These provisions may have the effect of delaying or preventing
          changes in control or management of ICG Communications.  All of
          these factors could materially adversely affect the price of our
          common stock.

          OUR OPERATIONS COULD BE ADVERSELY AFFECTED BY DATA PROCESSING
          FAILURES AFTER DECEMBER 31, 1999

                    Many computer systems, software applications and other
          electronics currently in use worldwide are programmed to accept
          only two digits in the portion of the date field which designates
          the year.  The "Year 2000 problem" arises because these systems
          and products cannot properly distinguish between a year that
          begins with "20" and the familiar "19."  If these systems and
          products are not modified or replaced, many will fail or create
          erroneous results and/or may cause other related systems to fail. 
          Our failure to correct a material Year 2000 problem could result
          in an interruption in or failure of certain of our normal
          business operations or activities.
   
                    Year 2000 compliance issues are of particular
          importance to us since our operations rely heavily upon computer
          systems, software applications and other electronics which
          contain of date-sensitive embedded technology.  Some of these
          technologies were internally developed and others are standard
          purchased systems which may or may not have been customized for
          our particular application.  We also rely heavily upon various
          vendors and suppliers that are themselves very reliant on
          computer systems, software applications and other electronics
          which contain date-sensitive embedded technology.

                    Our approach to addressing the potential impact of Year
          2000 compliance issues is focused upon ensuring, to the extent
          reasonably possible, the continued, normal operation of our
          business and supporting systems.  Accordingly, we have developed
          a comprehensive plan which we are applying to each segment of our
          computer systems and components.

                                     16
          <PAGE>

                    Through September 30, 1998, costs associated with Year
          2000 compliance issues incurred have been less than $0.1 million
          and have primarily included miscellaneous costs of reference
          materials and other Year 2000 compliance planning materials.  We
          have also incurred certain internal costs, including salaries and
          benefits for employees dedicating various portions of their time
          to Year 2000 compliance issues, which costs we believe have not
          exceeded $0.5 million through September 30, 1998.  We expect that
          total future costs of Year 2000 compliance efforts will be
          approximately $3.8 million, consisting of $2.3 million in
          consulting fees, $1.5 million in replacement hardware and
          software and other miscellaneous costs.  These anticipated costs
          represent approximately 4% of our budgeted expenses for
          information technology through December 31, 1999.  These cost
          estimates are based upon presently available information and may
          change as we continue with our Year 2000 compliance plan.  We
          intend to use cash on hand for Year 2000 compliance costs, as
          necessary.

                    While we rely heavily on our computer systems, software
          applications and other electronics containing date-sensitive embedded
          technology as part of our business operations, the components upon
          which we primarily rely were developed with current state-of-the-art
          technology.  Accordingly, we have reasonably assumed that our
          compliance program will demonstrate that many of our high-priority
          systems do not present material Year 2000 compliance issues.  For
          computer systems, software applications and other electronics
          containing date-sensitive embedded technology that have met our
          desired level of Year 2000 readiness, we will use our existing
          contingency plans to mitigate or eliminate problems we may experience
          if an unanticipated system failure were to occur.  For components that
          have not met our desired level of readiness, we will develop a
          specific contingency plan to determine the actions we would take if
          such component failed.

                    At the present time, we are unable to develop a most
          reasonably likely worst case scenario if we fail to achieve
          adequate Year 2000 compliance.  We will be better able to develop
          such a scenario once the status of Year 2000 compliance of our
          important vendors and suppliers is complete.  We will monitor our
          vendors and suppliers, particularly the other telecommunications
          companies upon which we rely, to determine whether they are
          performing and implementing an adequate Year 2000 compliance plan
          in a timely manner.

                    We view the Year 2000 compliance as a process that is
          inherently dynamic and will change in response to changing
          circumstances.  Although we believe that, through execution and
          satisfactory completion of our Year 2000 compliance strategy, our
          computer systems, software applications and electronics will be
          Year 2000 compliant, we cannot assure you until the Year 2000
          occurs that all systems and all related technology when running
          jointly will function adequately.  Additionally, we cannot assure
          you that the assumptions we made within our Year 2000 compliance
          strategy will prove to be correct, that the strategy will succeed
          or that the remedial actions being taken will be able to be
          completed by the time necessary to avoid system or component
          failures.  In addition, disruptions in the computer systems of
          vendors or customers, which are outside of our control, could
          impair our ability to obtain necessary products or services to
          sell to our customers.  Disruptions of our computer systems, or
          those of our vendors or customers, as well as the cost of
          avoiding such disruption, could have a material adverse effect on
          our financial condition and results of operations.



                                      17

          <PAGE>

          THE ACCURACY OF FORWARD-LOOKING STATEMENTS CONTAINED IN THIS
          PROSPECTUS IS UNCERTAIN

                    This prospectus contains certain "forward-looking
          statements," as defined in Section 27A of the Securities Act,
          that are based on the beliefs of our management, as well as
          assumptions made by, and information currently available to, our
          management.  The words "anticipates," "believes," "estimates,"
          "expects," "plans," "intends" and similar expressions are
          intended to identify these forward-looking statements, but are
          not the exclusive means of identifying them.  These forward-
          looking statements reflect the current views of our management;
          however, various risks, uncertainties and contingencies could
          cause our actual results, performance or achievements to differ
          materially from those expressed in, or implied by, these
          statements, including the following:

                    ( )  the success or failure of our efforts to implement
                         our business strategy,
                    ( )  actions of our competitors and our ability to
                         respond to such actions,
                    ( )  risks inherent in providing telecommunications
                         services,
                    ( )  the effect of government regulation and
                    ( )  the other factors discussed above under the
                         heading "Risk Factors" and elsewhere in this
                         prospectus.

          We assume no obligation to update publicly any forward-looking
          statements, whether as a result of new information, future events
          or otherwise.

                                     18
          <PAGE>

                                   USE OF PROCEEDS

               The selling stockholders will receive all of the proceeds
          from any sale of our common stock offered under this prospectus. 
          We will not receive any proceeds from the sale of the common
          stock offered under this prospectus.

                                   SELLING HOLDERS

               The selling stockholders may from time to time offer and
          sell pursuant to this prospectus any or all of the shares of
          common stock offered under this prospectus.  The selling
          stockholders listed below received their shares of ICG
          Communications common stock in connection with our acquisition of
          DataChoice Network Services in July 1998.

               The following table sets forth information with respect to
          the selling stockholders of the common stock for whom we are
          registering the shares for resale to the public.

                                                              Common Stock
                                   Common Stock                   Owned
                                      Owned          Shares       After
          Selling Stockholders  Prior to Offering   Offered     Offering
          --------------------  -----------------   -------    ----------
          G. Kelley Allen Trust        106,024      106,024          0
          Gordon B. Koch                11,679       11,679          0
           Daughters Trust
          Michele R.K. Fought           22,337       22,337          0
          T & D Consulting               5,957        5,957          0

               The Trustee of the G. Kelley Allen Trust is G. Kelley Allen. 
          Until the acquisition of DataChoice Network Services by ICG
          Communications, Mr. Allen was the Managing Member and Treasurer
          of DataChoice Network Services.  The Trustee of the Gordon B.
          Koch Daughters Trust is Carole K. Allen.  Ms. Allen is the wife
          of Mr. Allen.

               As part of the acquisition of DataChoice Network Services,
          ICG Communications' subsidiary, ICG Telecom Group, Inc., entered
          into an employment agreement with Michele R.K. Fought, and Ms.
          Fought currently serves as Director - Sales Support.  Prior to
          this position, Ms. Fought was the Secretary of DataChoice Network
          Services.

               T & D Consulting is a Colorado corporation whose
          shareholders are Thomas D. Sumbler and David J. Gandini.  Mr.
          Sumbler is currently employed by ICG Telecom Group as Senior Vice
          President - Wholesale Markets Group.  Mr. Gandini was employed by
          ICG Telecom Group, from February 1997 to November 1998, at which
          time he was Senior Vice President - Wholesale Markets Group and
          President - Internet Protocol of ICG Telecom Group.

                                     19
          <PAGE>

                                 PLAN OF DISTRIBUTION

               The common stock covered by this prospectus may be offered
          and sold from time to time by the selling stockholders, including
          in one or more of the following transactions:

               -  on the Nasdaq National Market;

               -  in the over-the-counter market;

               -  in transactions other than on the Nasdaq National Market
                  or in the over-the-counter market;

               -  in connection with short sales;

               -  by pledge to secure debts and other obligations;

               -  in connection with the writing of options, in hedge
                  transactions and in settlement of other transactions in
                  standardized or over-the-counter options; or

               -  in a combination of any of the above transactions.

               The selling stockholders may sell their shares at market
          prices prevailing at the time of sale, at prices related to
          prevailing market prices, at negotiated prices or at fixed
          prices.  Broker-dealers that are used to sell shares will either
          receive discounts or commissions from the selling stockholders or
          will receive commissions from the purchasers for whom they acted
          as agents.

               The sale of common stock by the selling stockholders is
          restricted under a registration rights agreement between ICG
          Communications and the selling stockholders.  ICG Communications
          and the selling stockholders have agreed to customary
          indemnification obligations regarding the sale of the common
          stock by use of this prospectus.  ICG Communications has agreed
          to keep this prospectus effective until July 27, 1999.

                                      20

          <PAGE>

                                    LEGAL MATTERS

               Our counsel, Thelen Reid & Priest LLP of New York, New York,
          will issue an opinion to us on certain legal matters relating to
          the shares.

                                       EXPERTS

               The consolidated financial statements of ICG Communications
          and subsidiaries as of September 30, 1996, December 31, 1996 and
          December 31, 1997 and for each of the fiscal years ended
          September 30, 1995, September 30, 1996, December 31, 1997 and the
          three-month period ended December 31, 1996, and the related
          schedule, have been incorporated by reference herein and in the
          registration statement in reliance upon the report of KPMG LLP,
          independent certified public accountants, incorporated by
          reference herein, and upon authority of said firm as experts in
          accounting and auditing.  The consolidated financial statements
          of NETCOM at December 31, 1996 and 1997, and for each of the
          three years in the period ended December 31, 1997 (not presented
          separately herein), have been audited by Ernst & Young LLP,
          independent auditors.

               The reports of KPMG LLP covering the September 30, 1996
          consolidated financial statements and schedule refer to a change
          in the method of accounting for long-term telecom services
          contracts.

                                     21

          <PAGE>


                                       PART II

                        INFORMATION NOT REQUIRED IN PROSPECTUS


          ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

             ICG Communications will pay all expenses related to the
          offering and sale to the public of the shares being registered,
          other than underwriting discounts and commissions.  Such expenses
          are set forth in the following table.  All the amounts shown are
          estimates, except the SEC registration fee and Nasdaq National
          Market listing fee.

             SEC Registration Fee                   $   736.91
             Accounting Fees and Expenses*            5,000.00
             Legal Fees and Expenses*                20,000.00
             Miscellaneous*                           5,000.00
                                                    ----------
             Total                                  $30,736.91
                                                    ==========
          
             ------------------------
             *  Estimated

          ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

             The Certificate of Incorporation of ICG Communications, Inc.
          provides that it will to the fullest extent permitted by the
          General Corporation Law of the State of Delaware (the "GCL"), as
          amended from time to time, indemnify all persons whom it may
          indemnify pursuant to the GCL.  ICG Communications' By-laws
          contain similar provisions requiring indemnification of ICG
          Communications' directors and officers to the fullest extent
          authorized by the GCL.  The GCL permits a corporation to
          indemnify its directors and officers (among others) against
          expenses (including attorneys' fees), judgments, fines and
          amounts paid in settlement actually and reasonably incurred by
          them in connection with any action, suit or proceeding brought
          (or threatened to be brought) by third parties, if such directors
          or officers acted in good faith and in a manner they reasonably
          believe to be in or not opposed to the best interests of the
          corporation and, with respect to any criminal action or
          proceeding, had no reasonable cause to believe their conduct was
          unlawful.  In a derivative action, i.e., one by or in the right
          of ICG Communications, indemnification may be made for expenses
          (including attorneys' fees) actually and reasonably incurred by
          directors and officers in connection with the defense or
          settlement of such action if they had acted in good faith and in
          a manner they reasonably believed to be in or not opposed to the
          best interests of ICG Communications, except that no
          indemnification shall be made in respect of any claim, issue or
          matter as to which such person shall have been adjudged liable to
          ICG Communications unless and only to the extent that the Court of
          Chancery or the court in which such action or suit was brought shall
          determine upon application that, despite the adjudication of
          liability but in view of all the circumstances of the case, such
          person is fairly and reasonably entitled to indemnity for such
          expenses.  The GCL further provides that, to the extent any
          director or officer has been successful on the merits or
          otherwise in defense of any action, suit or proceeding referred
          to in this paragraph, or in defense of any claim, issue or matter
          therein, such person shall be indemnified against expenses
          (including attorneys' fees) actually and reasonably incurred by
          him in connection therewith.  In addition, ICG Communications'
          Certificate of Incorporation contains a provision limiting the
          personal liability of ICG Communications' directors for monetary
          damages for certain breaches of their fiduciary duty.  ICG
          Communications has indemnification insurance under which directors
          and officers are insured against certain liability that may incur in
          their capacity as such.

                                   II-1

          <PAGE>

          ITEM 16. EXHIBITS.

          The following exhibits are filed as a part of this Registration
          Statement:

          Exhibit No.:   Description
          ------------   -----------

          *2.1:          Purchase Agreement, dated as of June 11, 1998, among
                         ICG D.C. Holdings, Inc., G. Kelley Allen and the
                         members of DataChoice Network Services, L.L.C.

           4.1:          Certificate of Incorporation of ICG Communications,
                         Inc. dated April 11, 1996 [Incorporated by reference
                         to Exhibit 3.1 to Registration Statement on Form S-4,
                         File No. 333-4226].

           4.2:          By-Laws of ICG Communications, Inc. [Incorporated by
                         reference to Exhibit 3.2 to Registration Statement on
                         Form S-4, File No. 333-4226].

          *4.3:          Registration Rights Agreement, dated as of July 27,
                         1998, between ICG Communications, Inc., and the
                         Sellers of DataChoice Network Services, L.L.C.

          *4.4:          Escrow Agreement, dated as of July 27, 1998, among ICG
                         Communications, Inc., the persons listed on Exhibit A
                                                                     ---------
                         thereto and Norwest Bank Colorado, National
                         Association.

          +5.1:          Opinion of Thelen Reid & Priest LLP.

         +23.1:          Consent of KPMG LLP.

         +23.2:          Consent of Ernst & Young LLP.

         +23.3:          Consent of Thelen Reid & Priest LLP (included in
                         Exhibit 5.1).

         *24.1:          Power of Attorney (included on the signature page
                         hereto).

                                                                             

          ------------------------
          *  Filed herewith.
          +  To be filed by amendment.


                                       II-2

          <PAGE>

          ITEM 17. UNDERTAKINGS.

          The undersigned Registrant hereby undertakes:

          (1)  To file, during any period in which offers or sales are
          being made, a post-effective amendment to this Registration
          Statement:

                 (i)   to include any prospectus required by Section 10(a)(3)
          of the Securities Act of 1933;

                 (ii)  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; and

                 (iii) 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;

          provided, however, that paragraphs (1)(i) and (1)(ii) do not
          apply if the information required to be included in a post-
          effective amendment by those paragraphs is contained in periodic
          reports filed by the Registrants pursuant to Section 13 or
          Section 15(d) of the Securities Exchange Act of 1934, that are
          incorporated by reference in the Registration Statement.

          (2)  That, for the purpose of determining any liability under the
          Securities Act, 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.

          (3)  To remove from registration by means of a post-effective
          amendment any of the securities being registered which remain
          unsold at the termination of the offering.

          (4)  That, for the purpose of determining any liability under the
          Securities Act, each filing of the Registrant's annual report
          pursuant to Section 13(a) or Section 15(d) of the Securities
          Exchange Act (and, where applicable, each filing of any employee
          benefit plan's annual report pursuant to Section 15(d) of the
          Securities Exchange Act) that is incorporated by reference in the
          Registration Statement 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.

             Insofar as indemnification for liabilities arising under the
          Securities Act may be permitted to directors, officers and
          controlling persons of the Registrants pursuant to the provisions
          described in Item 15 (other than the provisions relating to
          insurance), or otherwise, the Registrants have been advised that
          in the opinion of the Securities and Exchange Commission such
          indemnification is against public policy expressed in the
          Securities Act and is, therefore, unenforceable.  In the event
          that a claim for indemnification against such liabilities (other
          than the payment by the Registrants of expenses incurred or paid
          by a director, officer or controlling person of the Registrants
          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 Registrants
          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 Securities Act and will be governed by the final adjudication
          of such issue. 

                                       II-4

          <PAGE>

                                      SIGNATURES

          Pursuant to the requirements of the Securities Act of 1933, the
          Registrant certifies that it has reasonable grounds to believe
          that it meets all of the requirements for filing on Form S-3 and
          has duly caused this Registration Statement to be signed on its
          behalf by the undersigned, thereunto duly authorized, in the City
          of Englewood, State of Colorado, on March 9, 1999.

                                        ICG Communications, Inc. 


                                        By:  /s/ J. Shelby Bryan
                                            -------------------------------
                                                J. Shelby Bryan
                                                President, Chief Executive
                                                 Officer and Director





          KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
          appears below under the heading "Signatures" constitutes and
          appoints J. Shelby Bryan, Harry R. Herbst and H. Don Teague, each
          as his true and lawful attorney-in-fact and agent with full power
          of substitution and resubstitution, for him and in his name,
          place and stead, in any and all capacities, to sign any or all
          amendments (including post-effective amendments) and supplements
          to this Registration Statement and any related Registration
          Statement filed pursuant to Rule 462(b) of the Securities Act of
          1933, and to file the same, with all exhibits thereto, and other
          documents in connection therewith, with the Securities and
          Exchange Commission, granting unto said attorneys-in-fact and
          agents, and each of them, full power and authority to do and to
          perform each and every act and thing requisite and necessary to
          be done in connection with the above premises, as fully for all
          intents and purposes as he might or could do in person, hereby
          ratifying and confirming all that said attorneys-in-fact and
          agents, or any of them, or his or their substitute or
          substitutes, may lawfully do or cause to be done by virtue
          hereof.

          Pursuant to the requirements of the Securities Act of 1933, this
          Registration Statement has been signed by the following persons
          in the capacities and on the dates indicated.

                    Signature                  Title                 Date
                    ---------                  -----                 ----

            /s/ William J. Laggett      Chairman of the
           ---------------------------  Board of Directors   March 9, 1999
             William J. Laggett


            /s/ J. Shelby Bryan         President, Chief
           ---------------------------  Executive Officer
             J. Shelby Bryan            and Director
                                        (Principal           March 9, 1999
                                        Executive Officer)


            /s/ Harry R. Herbst         Executive Vice
           ---------------------------  President,
             Harry R. Herbst            Chief Financial
                                        Officer and          March 9, 1999
                                        Director (Principal
                                        Financial Officer)

            /s/ Richard Bambach         Vice President and
           ---------------------------  Corporate
             Richard Bambach            Controller           March 9, 1999
                                        (Principal
                                        Accounting Officer)


            /s/ Walter Threadgill       Director             March 9, 1999
           ---------------------------
             Walter Threadgill


            /s/ John U. Moorhead II     Director             March 9, 1999
           ---------------------------
             John U. Moorhead II


            /s/ Leontis Teryazos        Director             March 9, 1999
           ---------------------------
             Leontis Teryazos

                                   II-4
          
          <PAGE>

                               EXHIBIT INDEX
                               -------------

          Exhibit No.:   Description
          ------------   -----------

           2.1:          Purchase Agreement, dated as of June 11, 1998, among
                         ICG D.C. Holdings, Inc., G. Kelley Allen and the
                         members of DataChoice Network Services, L.L.C.

           
           4.3:          Registration Rights Agreement, dated as of July 27,
                         1998, between ICG Communications, Inc., and the
                         Sellers of DataChoice Network Services, L.L.C.

           4.4:          Escrow Agreement, dated as of July 27, 1998, among ICG
                         Communications, Inc., the persons listed on Exhibit A
                                                                     ---------
                         thereto and Norwest Bank Colorado, National
                         Association.
         
          24.1:          Power of Attorney (included on the signature page
                         hereto).

                                                                          
   



                                  PURCHASE AGREEMENT

                                        AMONG

                               ICG D.C. HOLDINGS, INC.

                                       AND THE

                                       MEMBERS

                                          OF

                         DATACHOICE NETWORK SERVICES, L.L.C.

<PAGE>


                                  TABLE OF CONTENTS
                                  -----------------
                                                                       PAGE
                                                                       ----

                                      ARTICLE I
                                     DEFINITIONS                          1

                                      ARTICLE II
                                  PURCHASE AND SALE . . . . . . . . . .   6

               SECTION 2.1    Basic Transaction . . . . . . . . . . . .   6
               SECTION 2.2    Purchase Price; Payment   . . . . . . . .   7
               SECTION 2.3    [Intentionally Omitted] . . . . . . . . .   7
               SECTION 2.4    Payment of Certain Amounts  . . . . . . .   7
               SECTION 2.5    [Intentionally omitted.]  . . . . . . . .   7
               SECTION 2.6    Closing; Closing Date . . . . . . . . . .   7
               SECTION 2.7    Deliveries at the Closing . . . . . . . .   7
               SECTION 2.8    Waiver of Rights of First Refusal . . . .   7

                                     ARTICLE III
                      REPRESENTATIONS AND WARRANTIES OF SELLERS . . . .   8

               SECTION 3.1    Organization, Good Standing, Etc. . . . .   8
               SECTION 3.2    Subsidiaries  . . . . . . . . . . . . . .   8
               SECTION 3.3    Ownership and Capitalization  . . . . . .   8
               SECTION 3.4    Authority; No Violation . . . . . . . . .   8
               SECTION 3.5    Consents and Approvals  . . . . . . . . .   9
               SECTION 3.6    Financial Statements  . . . . . . . . . .   9
               SECTION 3.7    Absence of Certain Changes or Events  . .  10
               SECTION 3.8    Tax Matters . . . . . . . . . . . . . . .  10
               SECTION 3.9    Assets and Properties . . . . . . . . . .  11
               SECTION 3.10   Lists of Properties, Contracts and Other
                              Data  . . . . . . . . . . . . . . . . . .  12
               SECTION 3.11   Litigation; Compliance with Applicable
                              Laws, Rights and Permits  . . . . . . . .  12
               SECTION 3.12   Accounts Receivable . . . . . . . . . . .  13
               SECTION 3.13   Product Quality, Warranty and Liability .  13
               SECTION 3.14   Insurance . . . . . . . . . . . . . . . .  13
               SECTION 3.15   Pension and Employee Benefit Matters  . .  14
               SECTION 3.16   Employees and Labor . . . . . . . . . . .  15
               SECTION 3.17   Customer and Supplier Relationships . . .  15
               SECTION 3.18   Environmental Matters . . . . . . . . . .  15
               SECTION 3.19   Intellectual Property . . . . . . . . . .  16
               SECTION 3.20   Brokers' Fees and Commissions . . . . . .  16
               SECTION 3.21   Acquisition for Investment  . . . . . . .  16
               SECTION 3.22   Disclosure  . . . . . . . . . . . . . . .  17



                                     -i-

<PAGE>

                                      ARTICLE IV
                       REPRESENTATIONS AND WARRANTIES OF BUYER  . . . .  18

               SECTION 4.1    Organization and Qualification, etc.  . .  18
               SECTION 4.2    Authority Relative to Agreement . . . . .  18
               SECTION 4.3    Non-Contravention . . . . . . . . . . . .  18
               SECTION 4.4    Government Approvals  . . . . . . . . . .  19
               SECTION 4.5    Brokers . . . . . . . . . . . . . . . . .  19
               SECTION 4.6    Purchase for Investment . . . . . . . . .  19
               SECTION 4.7    SEC Reports and Nasdaq Compliance . . . .  19

                                      ARTICLE V
                                PRE-CLOSING COVENANTS . . . . . . . . .  19

               SECTION 5.1    General . . . . . . . . . . . . . . . . .  19
               SECTION 5.2    Operation and Preservation of Business  .  20
               SECTION 5.3    Full Access . . . . . . . . . . . . . . .  20
               SECTION 5.4    Notice of Developments  . . . . . . . . .  20
               SECTION 5.5    Exclusivity . . . . . . . . . . . . . . .  20
               SECTION 5.6    Announcements . . . . . . . . . . . . . .  21
               SECTION 5.7    Payment By Sellers of Employee Claims and
                              Other Expenses  . . . . . . . . . . . . .  21
               SECTION 5.8    Closing Date Liabilities and Distribution  21
               SECTION 5.9    Confidentiality . . . . . . . . . . . . .  21
               SECTION 5.10   Consents and Approvals.   . . . . . . . .  21

                                      ARTICLE VI
                                POST-CLOSING COVENANTS  . . . . . . . .  22

               SECTION 6.1    Further Assurances  . . . . . . . . . . .  22
               SECTION 6.2    Transition  . . . . . . . . . . . . . . .  22
               SECTION 6.3    Cooperation . . . . . . . . . . . . . . .  22
               SECTION 6.4    Confidentiality . . . . . . . . . . . . .  22
               SECTION 6.5    Post-Closing Announcements  . . . . . . .  22
               SECTION 6.6    Financial Statements  . . . . . . . . . .  22
               SECTION 6.7    Satisfaction of Liabilities . . . . . . .  23
               SECTION 6.8    Sales of ICG Shares . . . . . . . . . . .  23
               SECTION 6.9    Restriction of Sellers' Activities  . . .  23

                                     ARTICLE VII
                                CONDITIONS TO CLOSING . . . . . . . . .  23

               SECTION 7.1    Conditions to Obligation of Buyer . . . .  23
               SECTION 7.2    Conditions to Obligation of Sellers . . .  25

                                     -ii-

<PAGE>


                                     ARTICLE VIII
                       REMEDIES FOR BREACHES OF THIS AGREEMENT  . . . .  26

               SECTION 8.1    Indemnification Provisions for Benefit of
                              Buyer and the Company . . . . . . . . . .  26
               SECTION 8.2    Indemnification Provisions for Benefit of
                              Sellers . . . . . . . . . . . . . . . . .  27
               SECTION 8.3    Matters Involving Third Parties . . . . .  28
               SECTION 8.4    Survival  . . . . . . . . . . . . . . . .  29
               SECTION 8.5    Limitations . . . . . . . . . . . . . . .  29
               SECTION 8.6    Basket and Ceiling  . . . . . . . . . . .  29

                                      ARTICLE IX
                                     TERMINATION  . . . . . . . . . . .  30

               SECTION 9.1    Termination of Agreement  . . . . . . . .  30
               SECTION 9.2    Effect of Termination . . . . . . . . . .  31
               SECTION 9.3    Confidentiality . . . . . . . . . . . . .  31

                                      ARTICLE X
                                    MISCELLANEOUS . . . . . . . . . . .  31

               SECTION 10.1   No Third-Party Beneficiaries  . . . . . .  31
               SECTION 10.2   Entire Agreement  . . . . . . . . . . . .  31
               SECTION 10.3   Succession and Assignment . . . . . . . .  31
               SECTION 10.4   Counterparts  . . . . . . . . . . . . . .  31
               SECTION 10.5   Headings, Terms . . . . . . . . . . . . .  32
               SECTION 10.6   Notices . . . . . . . . . . . . . . . . .  32
               SECTION 10.7   Governing Law . . . . . . . . . . . . . .  33
               SECTION 10.8   Amendments and Waivers  . . . . . . . . .  33
               SECTION 10.9   Severability  . . . . . . . . . . . . . .  33
               SECTION 10.10  Expenses  . . . . . . . . . . . . . . . .  33
               SECTION 10.11  Arbitration . . . . . . . . . . . . . . .  33
               SECTION 10.12  Construction  . . . . . . . . . . . . . .  34
               SECTION 10.13  Incorporation of Exhibits . . . . . . . .  34
               SECTION 10.14  Representations as to Knowledge . . . . .  34
               SECTION 10.15  Sellers' Agent  . . . . . . . . . . . . .  35

                                     -iii-

<PAGE>


          EXHIBITS

          Exhibit A Form of Employment Agreement
          Exhibit B Escrow Agreement
          Exhibit C Form of Noncompetition Agreement
          Exhibit D Form of Registration Rights Agreement
          Exhibit E Form of Assignment of Interests


          SCHEDULES

          Schedule 1.1(i)     Latest Balance Sheet
          Schedule 3.1(a)(i)  Qualifications and Authorizations of the
                              Company
          Schedule 3.1(a)(ii) Articles of Organization of the Company
          Schedule 3.1(a)(iii)Operating Agreement of the Company
          Schedule 3.3        Membership Interests in the Company
          Schedule 3.5        Sellers  Notices and Consents
          Schedule 3.6(a)     Audited Financial Statements
          Schedule 3.6(b)     Unaudited Financial Statements
          Schedule 3.7        Changes or Events
          Schedule 3.8(c)     Tax Returns
          Schedule 3.8(e)     Asset Bases
          Schedule 3.9(a)     Ownership of Assets and Equipment Leases
          Schedule 3.9(b)     Premises
          Schedule 3.10(a)    Description of Properties, Contracts and
                              Other Data (to Include All Items on Schedule
                              3.10(b))
          Schedule 3.10(b)    Generic List of Properties, Contracts and
                              Other Data
          Schedule 3.11(a)    Outstanding Litigation, Etc.
          Schedule 3.11(c)(i) Authorizations and Permits
          Schedule 3.11(c)(ii)Exceptions to Authorizations and Permits
          Schedule 3.12       Accounts Receivable Aging Schedule
          Schedule 3.13       Product or Service Liability Claims
          Schedule 3.14       Insurance
          Schedule 3.15       Employee Benefit and Pension Plans
          Schedule 3.15(u)    Retired Employees Receiving Uncovered
          Payments
          Schedule 3.17(a)    Principal Customers
          Schedule 3.17(b)    Principal Suppliers
          Schedule 3.19       Intellectual Property
          Schedule 4.3        Buyer's Notices and Consents


                                     -iv-


<PAGE>

                                  PURCHASE AGREEMENT

               This Purchase Agreement (this "Agreement") is entered into
          on June 11,  1998, by and between ICG D.C. Holdings, Inc., a
          Colorado corporation ("Buyer"), and G. Kelley Allen ("Allen"),
          and the G. Kelley Allen Trust (the "Trust"), and Michele R.K.
          Fought ("Fought"), T&D Consulting, Inc. and the Gordon B. Koch
          Daughters Trust (collectively with Fought, the "Minority
          Members").   Allen, the Trust and the Minority Members are herein
          collectively referred to as "Sellers" and individually, as a
          "Seller".


                                       RECITALS

               A.   Sellers (except for Allen) are all of the members of
          and own all of the interests in DataChoice Network Services,
          L.L.C., a Nevada limited liability company (the "Company").

               B.   Sellers desire to sell, and Buyer desires to purchase,
          all of the interests (the "Interests") in the Company as provided
          in this Agreement.
           

                                      AGREEMENT

               The parties agree as follows:


                                      ARTICLE I
                                     DEFINITIONS

               SECTION 1.1  For purposes of this Agreement:

               Adverse Consequences means all losses, damages, costs, 
               --------------------
          expenses, fees, Liabilities or other adverse consequences of any
          nature, however caused or incurred.

               Affiliate means, with respect to any Person, any Person
               ---------
          Controlling, Controlled by or under common Control with such
          Person.

               Affiliated Group means any affiliated group within the
               ----------------
          meaning of Code Section 1504 or any similar group defined under a
          similar provision of state, local or foreign law.

               Allen means G. Kelley Allen.
               -----

               Assets means all right, title and interest of the Company in
               ------
          and to all of the Company's tangible and intangible assets.

               Basket Amount has the meaning set forth in Section 8.6(a).
               -------------

<PAGE>


               Benefit Arrangements has the meaning set forth in Section 
               --------------------
          3.15(c).

               Business Day means any day on which commercial banks are
               ------------
          open for business in Denver, Colorado.

               Buyer has the meaning set forth in the preamble to this 
               -----
          Agreement.

               Closing and Closing Date have the meanings given in Section
               -------     ------------
          2.6.

               Closing Date Liabilities means all Liabilities and other
               ------------------------
          amounts for which Sellers are liable under Sections  2.4, 5.7,
          and 10.10.

               Code means the Internal Revenue Code of 1986, as amended.
               ----

               Company has the meaning set forth in Recital A.
               -------

               Company Employee Welfare Benefit Plan has the meaning set 
               -------------------------------------
          forth in Section 3.15(a).

               Confidential Information means, with respect to any Person, 
               ------------------------
          any information concerning such Person or its business, products,
          financial condition, prospects and affairs that is not already
          generally available to the public.

               Control means the power to direct the management or policies
               -------
          of any Person, through the power to vote shares or other equity
          interests, by contract or otherwise.

               Documents has the meaning set forth in Section 3.21.
               ---------

               Employee Welfare Benefit Plan has the meaning set forth in
               -----------------------------
          ERISA Section 3(1).

               Employment Agreement means the Employment Agreement between 
               --------------------
          Buyer and Fought, substantially in the form attached as 
          EXHIBIT A. 
          ---------

               Encumbrance means any mortgage, pledge, conditional sale 
               -----------
          agreement, charge, claim, interest of another Person, lien,
          security interest, title defect or other encumbrance.

               Environmental Obligations means all Legal Requirements and 
               -------------------------
          Permits concerning land use, public health, safety, welfare or
          the environment, including, without limitation, the Resource
          Conservation and Recovery Act (42 U.S.C. (Section) 6901 et seq.),
                                                                  -- ---
          as amended, and the Comprehensive Environmental Response,
          Compensation, and Liability Act (42 U.S.C. (Section) 9601 
          et seq.), as amended.
          -- ---

               ERISA means the Employee Retirement Income Security Act of
               -----
          1974, as amended, and any regulations, rules or orders
          promulgated under the Employee Retirement Income Security Act of
          1974, as amended.
                       
                                     -2-

<PAGE>

               ERISA Affiliate means any entity that is controlled by, or
               ---------------
          is under common control with, the Company, as determined under
          ERISA Section 4001(a)(14).

               Escrow Agent means Norwest Bank Colorado, N.A.
               ------------

               Escrow Agreement means the Escrow Agreement among Buyer,
               ----------------
          Sellers and the Escrow Agent in the form of EXHIBIT B.
                                                      ---------

               Escrow Period means the period commencing on the Closing 
               -------------
          Date and ending on the date which is twelve months after the
          Closing Date.

               Financial Statements has the meaning set forth in Section 
               --------------------
          3.6.

               Fought means Michele R.K. Fought.
               -----

               Free Up Date has the meaning set forth in Section 6.8.
               ------------

                GAAP means generally accepted accounting principles as in 
                ----
          effect from time to time in the United States.

               Governmental Authority means the United States of America or
               ----------------------
          any foreign jurisdiction, any state, commonwealth, territory or
          possession of the United States of America or any such foreign
          jurisdiction, any political subdivision of any of them (including
          counties, municipalities, home-rule cities and the like), and any
          agency, authority or instrumentality of any of the foregoing,
          including, without limitation, any court, tribunal, department,
          bureau, commission or board.

               Hazardous Materials means any material, chemical, compound, 
               -------------------
          mixture, hazardous substance, hazardous waste, pollutant or
          contaminant defined, listed, classified or regulated under any
          Environmental Obligation.

               ICG means ICG Communications, Inc., a Delaware corporation.
               ---

               ICG Shares means the newly-issued shares of common stock of 
               ----------
          ICG payable to Sellers under Section 2.2.

               Indemnified Party has the meaning set forth in Section 
               -----------------
          8.3(a).

               Indemnifying Party has the meaning set forth in Section
               ------------------
          8.3(a).

               Intellectual Property means (a) all inventions (whether 
               ---------------------
          patentable or unpatentable and whether or not reduced to
          practice), all improvements thereto, and all patents, patent
          applications and patent disclosures, together with all
          reissuances, continuations, continuations-in-part, revisions,
          extensions and reexaminations thereof, (b) all trademarks,

                                     -3-

<PAGE>

          service marks, trade dress, logos, trade names and corporate
          names, including the name "DataChoice Network Services, L.L.C.,"
          "DataChoice," and "DataChoice Network," together with all
          translations, adaptations, derivations and combinations thereof
          and including all goodwill associated therewith, and all
          applications, registrations and renewals in connection therewith,
          (c) all copyrightable works, all copyrights and all applications,
          registrations and renewals in connection therewith, (d) all mask
          works and all applications, registrations and renewals in
          connection therewith, (e) all trade secrets and confidential
          business information (including ideas, research and development,
          know-how, formulas, compositions, manufacturing and production
          processes and techniques, technical data, designs, drawings,
          specifications, customer and supplier lists, pricing and cost
          information, and business and marketing plans and proposals), (f)
          all computer software (including data and related documentation),
          (g) all other proprietary rights and (h) all copies and tangible
          and intangible embodiments thereof (in whatever form or medium).

               Interests means all of the membership interests issued by
               ---------
          the Company to all of its members.

               Latest Balance Sheet means the unaudited balance sheet of 
               --------------------
          the Company and the related unaudited statements of income,
          expense and cash flow dated as of April 30, 1998 and attached as
          SCHEDULE 1.1(I).
          ----------------

               Legal Requirement means any constitution, statute,
               -----------------
          ordinance, code, or other law (including common law), rule,
          regulation, Order, notice, standard, procedure or other
          requirement enacted, adopted, applied or issued by any
          Governmental Authority, including, without limitation, judicial
          decisions.

               Liability means any liability or obligation (whether known 
               ---------
          or unknown, whether asserted or unasserted, whether absolute or
          contingent, whether accrued or unaccrued, whether liquidated or
          unliquidated, and whether due or to become due).

               Material Adverse Effect means, with respect to the Company 
               -----------------------
          or its businesses, assets, financial condition, properties or
          prospects, any event, fact, circumstance or condition that in the
          aggregate may result in an adverse impact to the Company that
          would exceed $20,000.

               Minority Members has the meaning set forth in the preamble 
               ----------------
          to this Agreement.

               Nasdaq means the Automated Quotation System of the National 
               ------
          Association of Securities Dealers, Inc.

               Nasdaq Market means the Nasdaq National Market.
               -------------

               Noncompetition Agreements means the Noncompetition 
               -------------------------
          Agreements between Buyer and each of Allen and Fought, the form
          of each of which is attached as EXHIBIT C.
                                          --------- 

                                     -4-

<PAGE>


               Orders means all judgments, injunctions, orders, rulings, 
               ------
          decrees, directives, notices of violation or other requirements
          of any Governmental Authority or arbitrator having jurisdiction
          in the matter, including a bankruptcy court or trustee.

               Other Buyer Agreements means the Escrow Agreement, the 
               ----------------------
          Employment Agreements, the Noncompetition Agreements, the
          Registration Rights Agreement and the other documents and
          instruments executed and delivered by Buyer pursuant to Section
          7.2 of this Agreement.

               Other Seller Agreements means the Employment Agreement, the 
               -----------------------
          Escrow Agreement, the Noncompetition Agreements, the Registration
          Rights Agreement, and other documents and instruments executed
          and delivered by Sellers pursuant to Section 7.1 of this
          Agreement.

               Permits means all permits, licenses, consents, franchises, 
               -------
          authorizations, approvals, privileges, waivers, exemptions,
          variances, exclusionary or inclusionary Orders and other
          concessions, whether governmental or private, including, without
          limitation, those relating to environmental, public health,
          welfare or safety matters.

               Permitted Liabilities means, with respect to the Company, 
               ---------------------
          (a) indebtedness for borrowed money in an amount equal to the
          indebtedness incurred and outstanding as of December 31, 1997 as
          reflected on the Latest Balance Sheet, (b) all other liabilities
          reflected on the Latest Balance Sheet, and (c) current
          liabilities consisting of trade payables and current expenses of
          the Company incurred in the ordinary course of business since
          December 31, 1997, consistent with past practice.

               Person means an individual, and a partnership, corporation, 
               ------
          association, joint stock company, trust, joint venture, limited
          liability company, unincorporated organization,  Governmental
          Authority or other entity.

               Premises means the real property, buildings and improvements
               --------
          on such real property constituting the business premises of the
          Company as described on SCHEDULE 3.9(B).
                                  ----------------

               Premises Lease means the lease agreement, in form and
               --------------
          substance satisfactory to Buyer, between Buyer and Southwest
          Plaza - GGPLP, as lessor with respect to Premises leased by the
          Company in Littleton, Colorado, under which Buyer will lease the
          Premises following Closing.

               Principal Customers has the meaning set forth in Section 
               -------------------
          3.17(a).

               Principal Suppliers has the meaning set forth in Section
               -------------------
          3.17(b).

               Purchase Price means the sum of $5,000,000.
               --------------

               Registration Rights Agreement means the agreement between 
               -----------------------------
          ICG and Sellers in the form attached as EXHIBIT D.
                                                  ---------


                                     -5-

<PAGE>

               Reply Notice has the meaning set forth in Section 2 of the 
               ------------
          Escrow Agreement.

               Reply Period has the meaning set forth in Section 2 of the 
               ------------
          Escrow Agreement.

               Right means any right, property interest, concession, 
               -----
          patent, trademark, trade name, copyright, know-how or other
          proprietary right of another Person.

               SEC Reports has the meaning set forth in Section 4.7.
               -----------

               Securities Act means the Securities Act of 1933, as amended,
               --------------
          and all rules and regulations promulgated thereunder.

               Seller Transaction Expenses has the meaning set forth in
               ---------------------------
          Section 10.10.

               Sellers' Agent means G. Kelley Allen.
               --------------

               Seller and Sellers have the meaning set forth in the 
               ------------------
          preamble to this Agreement.

               Survival Period means, with respect to a representation or
               ---------------
          warranty, the applicable period after the Closing Date during
          which such representation or warranty survives pursuant to
          Section 8.4.

               Tax means any federal, state, local or foreign income, gross
               ---
          receipts, license, payroll, employment, excise, severance, stamp,
          occupation, premium, windfall profits, environmental (including
          taxes under Code Section 59A), customs duties, capital stock,
          franchise, profits, withholding, social security (or similar),
          unemployment, disability, real property, documentary, personal
          property, sales, use, transfer, registration, value added,
          alternative or add-on minimum, estimated or other tax of any kind
          whatsoever, or any escheat obligations, including any interest,
          penalty or addition, 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 to any of them, and
          including any amendment of any of them.

               Third Party Claim has the meaning set forth in Section 
               -----------------
          8.3(a).

                                      ARTICLE II
                                  PURCHASE AND SALE

               SECTION 2.1  Basic Transaction.  Subject to the terms and 
                            -----------------
          conditions set forth in this Agreement, Buyer agrees to purchase
          from Sellers, and Sellers agree to sell to Buyer, all of the
          Interests, free and clear of any Encumbrance or Tax, for the
          consideration specified in Section 2.2.  Buyer will have no

                                     -6-

<PAGE>


          obligation under this Agreement to purchase less than all of the
          Interests.

               SECTION 2.2 Purchase Price; Payment.  The Purchase Price for
                           -----------------------
          the Interests will be payable in the form of (a) $560,000 in
          cash, and (b) 145,997 ICG Shares.  On the Closing Date Buyer will
          (x) pay to Sellers in cash by wire transfer to an account or
          accounts designated by Sellers' Agent the amount of $560,000 in
          cash, (y) pay to Sellers 129,556 ICG Shares and (z) deposit
          16,441 ICG Shares with the Escrow Agent pursuant to the terms of
          the Escrow Agreement.  In addition to the Purchase Price, at the
          Closing Buyer will pay Allen the sum of $250,000 and Fought the
          sum of $250,000, each such amount to be payable in cash, in
          consideration for Allen's and Fought's obligations under the
          Noncompetition Agreements.

               SECTION 2.3 [Intentionally Omitted].
                           -----------------------

               SECTION 2.4 Payment of Certain Amounts.  Sellers will pay, 
                           --------------------------
          and bear sole liability for, the following costs, expenses,
          amounts and claims: (a) all Taxes, fees and charges payable in
          respect of or as a result of the sale and transfer of the
          Interests to Buyer pursuant to this Agreement; (b) all Seller
          Transaction Expenses in excess of $10,000 in the aggregate, and
          the amounts described in Section 5.7 and (c) all amounts owing to
          employees (other than claims for earned commissions) and other
          Persons arising out of events or circumstances occurring prior to
          or as a result of the Closing.  Upon receipt of evidence
          reasonably satisfactory to Buyer of liability therefor on payment
          thereof, Buyer will reimburse Sellers, pay, or bear liability
          for, as the case may be, all Seller Transaction Expenses in an
          amount not to exceed $10,000 in the aggregate.

               SECTION 2.5 [Intentionally Omitted].
                           -----------------------

               SECTION 2.6 Closing; Closing Date.  The closing of the
                           ---------------------
          transactions contemplated by this Agreement (the "Closing") will
          take place within five Business Days after the satisfaction or
          waiver of all conditions set forth in Sections 7.1 and 7.2, at
          the offices of Sherman & Howard L.L.C. in Denver, Colorado, and
          all transactions contemplated by this Agreement will be effective
          at 12:00 a.m. local time in Denver, Colorado, on the day of the
          Closing (such effective time being the "Closing Date").

               SECTION 2.7 Deliveries at the Closing.  At the Closing, (a)
                           -------------------------
          Sellers will deliver, or cause to be delivered, to Buyer the
          certificates, instruments and documents referred to in
          Section 7.1, (b) Buyer will deliver to Sellers the certificates,
          instruments and documents referred to in Section 7.2, (c) Sellers
          will deliver to Buyer assignments of the Interests in the form of
          EXHIBIT E, free and clear of any Encumbrances or Taxes and (d) 
          ---------
          Buyer will pay and deposit the purchase price in accordance with
          Section 2.2.

               SECTION 2.8 Waiver of Rights of First Refusal.  Sellers 
                           ---------------------------------
          waive all rights of first refusal arising under Section 10.02 of
          the Operating Agreement of the Company effective as of April 25,
          1996.


                                     -7-

<PAGE>

                                     ARTICLE III
                      REPRESENTATIONS AND WARRANTIES OF SELLERS

               Sellers jointly and severally represent and warrant to Buyer
          as follows, as of the date of this Agreement:

               SECTION 3.1  Organization, Good Standing, Etc.  (a)  The
                            --------------------------------
          Company is a limited liability company duly organized, validly
          existing and in good standing under the laws of the State of
          Nevada, and is qualified and authorized to do business as a
          foreign limited liability company and is in good standing in each
          of the jurisdictions listed on SCHEDULE 3.1(A)(I), which are the
                                         ------------------
          only jurisdictions in which the nature of the business conducted
          by the Company or the properties leased or operated by it make
          such qualification necessary.  The Company has all requisite
          power and authority to own, lease and operate its properties and
          to carry on its business as is now being conducted.  The copies
          of (i) the articles of organization (certified by the Secretary
          of State of its jurisdiction of organization) and (ii) the
          operating agreement of the Company, both as amended to date,
          which have been delivered to Buyer by Sellers, and are attached
          as SCHEDULES 3.1(A)(II) and 3.1(A)(III), 
             ------------------------------------
          respectively, are complete and correct, and the Company is not in
          default under or in violation of any provision of its articles of
          organization or operating agreement.  The minute books, which
          contain the records of all meetings of or actions by the members
          of the Company, and the record books of the Company, copies of
          which have been delivered to Buyer by Sellers, are correct and
          complete.

               SECTION 3.2  Subsidiaries. The Company does not own any 
                            ------------
          equity or other interest in any other corporation, limited
          liability company, partnership or any other Person.

               SECTION 3.3  Ownership and Capitalization.  The interests
                            ----------------------------
          issued by the Company are described on SCHEDULE 3.3 and as of the
                                                 ------------
          date of this Agreement such interests are owned by such Persons
          and in such percentages as is set forth on SCHEDULE 3.3.  All of 
                                                     ------------
          the interests issued by the Company have been validly issued, and
          are fully paid and nonassessable, with no personal Liability
          attaching to the ownership of such interests.  There is no
          authorized or outstanding equity interest or security convertible
          into or exchangeable for, or any authorized or outstanding
          option, warrant or other right to subscribe for or to purchase,
          or convert any obligation into, any unissued interests in the
          Company and the Company has not agreed to issue any security so
          convertible or exchangeable or any such option, warrant or other
          right.  There are no authorized or outstanding equity
          appreciation, phantom equity, profit participation, equity
          participation or other similar rights with respect to the
          Company.  There are no voting trusts, voting agreements, proxies
          or other agreements or understanding with respect to any of the
          Interests.  There are no existing rights of first refusal, buy-
          sell arrangements, options, warrants, rights, calls, or other
          commitments or restrictions of any character relating to any of
          the Interests, except those restrictions on transfer imposed by
          the Securities Act and applicable state securities laws.

               SECTION 3.4  Authority; No Violation.  Sellers (and each of
                            -----------------------
          them individually) have full and absolute right, power, authority
          and legal capacity to execute, deliver and perform this Agreement


                                     -8-

<PAGE>

          and all Other Seller Agreements to which Sellers are a party, and
          assuming the due authorization, execution and delivery by such
          other Persons as are parties thereto, this Agreement constitutes,
          and the Other Seller Agreements when executed and delivered by
          the parties thereto will constitute, the legal, valid and binding
          obligations of, and will be enforceable in accordance with their
          respective terms against, Sellers (and each of them
          individually), except as such enforcement is subject to the
          effect of (i) any applicable bankruptcy, insolvency,
          reorganization or similar laws relating to or affecting
          creditors' rights generally, and (ii) general principles of
          equity, including concepts of reasonableness, good faith and fair
          dealing, and other similar doctrines affecting the enforceability
          of agreements generally (regardless of whether considered in a
          proceeding in equity or at law).  The execution, delivery and
          performance of this Agreement and the Other Seller Agreements and
          the consummation of the transactions contemplated by each such
          agreement will not (a) violate any Legal Requirement to which the
          Company or any Seller is subject or any provision of the articles
          of organization or operating agreement of the Company, or (b)
          violate, with or without the giving of notice or the lapse of
          time or both, or conflict with or result in the breach or
          termination of any provision of, or a diminution of the rights of
          the Company under, or constitute a default under, or give any
          Person the right to accelerate any obligation under, or result in
          the creation of any Encumbrance upon any properties, assets or
          business of the Company or of any Seller, pursuant to any
          indenture, mortgage, deed of trust, lien, lease, license, Permit,
          agreement, instrument or other arrangement to which the Company
          or any Seller is a party or by which the Company or any Seller,
          or any of their respective assets and properties is bound or
          subject.

               SECTION 3.5  Consents and Approvals.  Except as set forth in
                            ----------------------
          SCHEDULE 3.5, no filing or registration with, no notice to and no
          ------------
          permit, authorization, consent or approval of any Governmental
          Authority or any Person is necessary for the consummation by
          Sellers of the transactions contemplated by this Agreement other
          than (a) requirements of federal and securities laws, (b) the
          authorization of all applicable regulatory agencies necessary or
          desirable to consummate the transactions contemplated by this
          Agreement and (c) those consents and approvals already obtained
          as described on Schedule 3.5.
                          ------------ 

               SECTION 3.6  Financial Statements.  Sellers have delivered 
                            --------------------
          to Buyer complete and correct copies of the Company's (a)
          unaudited balance sheets, income statements and related
          statements of cash flow and members' equity for and as of the
          year December 31, 1996 and the period May 1, 1996 through
          December 31, 1997 and (b) unaudited balance sheets, income
          statements and the statements of cash flow for the periods ending
          January 31, 1998, February 28, 1998, March 31, 1998 and April 30,
          1998, (collectively, the "Financial Statements"). The Financial
          Statements are in accordance with the books and records of the
          Company, as applicable, and were prepared on a consistent basis
          throughout the periods covered and present fairly the Company's
          financial position, results of operations and changes in
          financial position as of the dates and for the periods indicated. 
          At the date of the Latest Balance Sheet, the Company had no known
          liability or obligation, whether accrued, absolute, fixed or
          contingent (including liabilities for taxes or unusual forward or
          long-term commitments), that were not fully reflected or reserved
          against on the Latest Balance Sheet, business, financial
          condition or results of operations of the Company, nor does the
          Company have any contingent Liabilities not disclosed on the


                                     -9-

<PAGE>


          Financial Statements.  Copies of the financial statements
          described in clause (a) of this Section 3.6 are attached as
          SCHEDULE 3.6(A), and copies of the financial statements
          ---------------
          described in clause (b) of this Section are attached as 
          SCHEDULE 3.6(B).  All balance sheets, statements of revenue and
          --------------
          expense and other financial statements prepared by or with
          respect to the Company after the date of this Agreement will be
          prepared in accordance with and on a basis and in a manner
          consistent with the Financial Statements.

               SECTION 3.7  Absence of Certain Changes or Events.  Since
                            ------------------------------------
          December 31, 1997,  and except as disclosed in SCHEDULE 3.7,  the
                                                         ------------
          Company has not: (a) incurred any debt, indebtedness or other
          Liability, except Permitted Liabilities; (b) delayed or postponed
          the payment of accounts payable or other Liabilities or
          accelerated the collection of any receivable beyond stated,
          normal terms; (c) sold or otherwise transferred any of its
          equipment or other assets or properties that are, individually or
          in the aggregate, material to the Company; (d) cancelled,
          compromised, settled, released, waived, written-off or expensed
          any account or note receivable, right, debt or claim involving
          more than $10,000 individually or in the aggregate; (e) changed
          in any significant manner the way in which it conducts business;
          (f) made or granted any individual wage or salary increase or any
          additional benefits of any kind or nature or modified any
          commission or compensation arrangement applicable to any employee
          of the Company; (g) entered into any contracts or agreements, or
          made any commitments, involving more than $10,000 individually or
          in the aggregate or accelerated, terminated, delayed, modified or
          cancelled any agreement, contract, lease or license (or series of
          related agreements, contracts, leases and licenses) involving
          more than $10,000 individually or in the aggregate; (h) suffered
          any Material Adverse Effect, including to or in its business,
          assets, financial condition, prospects or customer or supplier
          relationships; (i) made any payment or transfer to or for the
          benefit of any Seller or permitted any Person, including, without
          limitation, any Seller, to withdraw assets from the Company other
          than as disclosed on SCHEDULE 3.7;  
                               ------------
          (j) suffered any other significant occurrence, event, incident,
          action, failure to act or transaction outside the ordinary course
          of business consistent with past practice, (k) engaged in any
          other activity outside the ordinary course of business consistent
          with past practice, or (l) agreed to incur, take, enter into,
          make or permit any of the matters described in clauses
          (a) through (k).

               SECTION 3.8  Tax Matters.
                            -----------

               (a)  The Company has timely filed all Tax Returns it was
          required to file.  All such Tax Returns are correct and complete
          in all material respects.  All Taxes owed by the Company and by
          each Seller (whether or not shown on any Tax Return) have been
          paid.  The Company is not, and no Seller is, currently the
          beneficiary of any extension of time within which to file any Tax
          Return.  No claim has ever been made by an authority in a
          jurisdiction where the Company does not file Tax Returns that it
          is or may be subject to taxation by that jurisdiction.  There are
          no Encumbrances on any of the assets of the Company or on those
          of any Seller that arose in connection with any failure (or
          alleged failure) to pay any Tax.


                                     -10-

<PAGE>

               (b)  The Company has withheld and paid all Taxes required to
          have been withheld and paid in connection with amounts paid or
          owing to any employee, independent contractor, creditor, any
          Seller or other third party.

               (c)  There is no known basis for any authority to assess any
          additional Taxes for any period for which Tax Returns of the
          Company or any Seller have been filed.   There is no pending or
          threatened dispute or claim concerning any Tax Liability of the
          Company or of any Sellers.  SCHEDULE 3.8(C) lists all federal, 
                                      ---------------
          state, local and foreign income Tax Returns filed with respect to
          the Company and each Seller for taxable periods ended on or after
          December 31, 1996.  No such Tax Return has ever been audited. 
          Sellers have delivered to Buyer correct and complete copies of
          all federal income Tax Returns, examination reports, and
          statements of deficiencies filed or assessed against or agreed to
          by the Company since December 31, 1996.

               (d)  Neither the Company nor any Seller has waived any
          statute of limitations in respect of Taxes or agreed to any
          extension of time with respect to a Tax assessment or deficiency.

               (e)  SCHEDULE 3.8(E) sets forth the basis of the Company in
                    ---------------
          each of its assets as of December 31, 1997.

               (f)  All Taxes payable by all present and former members of
          the Company in respect of the Company's taxable income have been
          paid.

               (g)  The Company has not made any election to be classified
          as a corporation taxable as an association for federal, state or
          foreign tax purposes.

               SECTION 3.9  Assets and Properties.
                            --------------------- 

               (a)  Except as disclosed on SCHEDULE 3.9(A), as of the date
                                           ---------------
          of this Agreement, the Company owns all of its Assets, free and
          clear of all Encumbrances and the Company has and will have good
          and marketable title to (or, in the case of the Assets that are
          leased, valid leasehold interests in) all of its Assets.  The
          Assets consist of the tangible and intangible assets of the
          Company in existence as of the date of this Agreement (except for
          such changes in accounts receivable in the ordinary course of
          business as are not in violation of Section 3.7).  The Assets of
          the Company are all of the tangible and intangible assets used by
          the Company in, or necessary for the conduct of, its business. 
          The Assets and any property leased by the Company from third
          parties encompass all Assets and all property used by the Company
          to generate the income reflected in the financial statements
          attached as SCHEDULES 3.6(A) AND 3.6(B).  SCHEDULE 3.9(A) lists 
                      ---------------------------   ---------------
          all the equipment leased by the Company as of the date of this
          Agreement.  The Company does not lease any equipment from any
          Seller.  All of the tangible Assets of the Company are located on
          the Premises.

               (b)  SCHEDULE 3.9(B) sets forth a description of all of the 
                    ---------------
          real property, buildings and improvements used by the Company in
          its business (the "Premises").  The Premises are supplied with


                                     -11-


<PAGE>

          utilities and other services necessary for the operation of the
          Premises.  The Premises are free from defects, have been
          maintained in accordance with normal industry practice, are in
          good operating condition and repair and are suitable for the
          purposes for which they presently are used.  The Premises have
          received all approvals of Governmental Authorities (including
          Permits) required in connection with the occupation and operation
          of the Premises and have been occupied, operated and maintained
          in accordance with applicable Legal Requirements.  None of
          Sellers or the Company has received notice of violation of any
          Legal Requirement or Permit relating to its operations or its
          leased properties.

               (c)  No party to any lease with respect to any Premises has
          repudiated any provision of such lease, and there are no
          disputes, oral agreements or forbearance programs in effect as to
          any such lease.

               SECTION 3.10  Lists of Properties, Contracts and Other Data. 
                             ----------------------------------------------
          Attached as SCHEDULE 3.10(B) is a generic list of certain
                      ---------------
          properties, contracts and other data.  SCHEDULE 3.10(A) is a 
                                                 ----------------
          correct and complete description for the Company setting forth
          the properties, contracts and other data of the Company as of
          March 31, 1998 that are identified on SCHEDULE 3.10(B).  True and
                                                ----------------
          complete copies of the items (or descriptions of such items)
          referred to in SCHEDULE 3.10(A) have been delivered to Buyer or 
                        ----------------
          provided to Buyer for inspection.  The contracts, contractual
          obligations and other Rights described in SCHEDULE 3.10(A) are 
                                                    ----------------
          valid, in full force and effect, enforceable in accordance with
          their respective terms for the period stated, and, to the
          knowledge of Sellers,  no party has repudiated any provision
          thereof and no action or claim is pending or threatened to
          revoke, modify, terminate or render invalid any of such items. 
          Neither the Company nor, to the knowledge of Sellers, any Other
          Party is in breach or default in performance of any of its
          respective obligations under, and no event exists which, with the
          giving of notice or lapse of time or both, would constitute a
          breach, default or event of default on the part of a party to,
          any of the foregoing contracts, contractual obligations or Rights
          that is continuing unremedied.

               SECTION 3.11  Litigation; Compliance with Applicable Laws, 
                             ---------------------------------------------
          Rights and Permits.
          -------------------

               (a)  There is no outstanding Order against, nor, except as
          set forth on SCHEDULE 3.11(A), is there any litigation, 
                       ----------------
          proceeding, arbitration or investigation by any Governmental
          Authority or other Person pending or threatened against, the
          Company, its properties or business or relating to the
          transactions contemplated in this Agreement, nor is there any
          basis for any such action.

               (b)  The Company and its Assets (including its Premises,
          facilities, machinery and equipment and the use thereof) are not
          in violation of any applicable Legal Requirement or right.  None
          of Sellers or the Company has received notice from any
          Governmental Authority or other Person of any violation or
          alleged violation of any Legal Requirement or Right, and no
          action, suit, proceeding, hearing, investigation, charge,
          complaint, claim, demand or notice has been filed or commenced or
          is pending or threatened against the Company.


                                     -12-

<PAGE>


               (c)  SCHEDULE 3.11(C)(I) lists all authorizations and 
                    -------------------
          Permits held by the Company with respect to the operation of its
          business.  Each authorization and Permit listed in
          SCHEDULE 3.11(C)(I) is valid and effective and the Company is in
          -------------------
          compliance with all material terms, conditions and requirements
          of such authorizations and Permits. Except as set forth in
          SCHEDULE 3.11(C)(II), the Company possesses all authorizations, 
          --------------------
          Permits, licenses and Orders required or necessary to conduct its
          business and operations in the manner in which such business and
          operations are being and historically have been conducted.

               SECTION 3.12  Accounts Receivable.  The accounts receivable 
                             ------------------- 
          of the Company reflected on SCHEDULE 3.12 have arisen in the 
                                      ------------- 
          ordinary course of business; reflect bona fide business
          arrangements; no payor has given any Seller or the Company
          written notice of any inability to pay such account receivable in
          due course or of any claim or defense against payment of such
          account receivable; no oral statements to such effect have been
          made to any Seller or the Company; no basis exists for any payor
          to raise any claim or defense against payment with respect to any
          such account receivable; and SCHEDULE 3.12 sets forth a true and 
                                       -------------
          correct statement regarding the aging of such accounts receivable
          as of the date of this Agreement.

               SECTION 3.13  Product Quality, Warranty and Liability.  All 
                             ---------------------------------------
          products and services provided or delivered by the Company to
          customers on or prior to the date of this Agreement conform to
          applicable contractual commitments, express and implied
          warranties, product and service specifications and quality
          standards, and the Company has no Liability, and to the knowledge
          of  Sellers there is no basis for any Liability, for additional
          service, replacement or repair or other damages in connection
          with such products and services.  No product or service provided
          or delivered by the Company to customers on or prior to the date
          of this Agreement is subject to any guaranty, warranty or other
          indemnity beyond the applicable standard terms and conditions of
          sale, rent or lease.  The Company has no Liability and, to the
          knowledge of Sellers there is no basis for any Liability, arising
          out of any injury to a Person, property or otherwise as a result
          of the ownership, possession, provision or use of any product or
          service sold, rented, leased, provided or delivered by the
          Company on or prior to the date of this Agreement.  No product or
          service liability claim has been asserted against the Company,
          whether covered by insurance or not and whether litigation has
          resulted or not, except as listed and summarized on
          SCHEDULE 3.13.
          --------------

               SECTION 3.14  Insurance.  The Company has policies of 
                             ---------
          insurance (a) covering risk of loss on its Assets and (b)
          covering products and services liability and liability for fire,
          property damage, personal injury, and workers' compensation
          coverage, all with responsible and financially sound insurance
          carriers in adequate amounts and in compliance with governmental
          requirements and in accordance with good industry practice. 
          SCHEDULE 3.14 sets forth a complete and accurate list of all 
          ------------- 
          insurance policies of the Company and the annual premiums payable
          thereunder.  All such insurance policies are valid, in full force
          and effect and enforceable in accordance with their respective
          terms and no party has repudiated any provision of such policies. 
          Neither the Company, nor to the knowledge of Sellers, any other
          party to any such policy, is in breach or default (including with
          respect to the payment of premiums or the giving of notices) in
          the performance of any of their respective obligations under any


                                     -13-

<PAGE>



          such policy, and, to the knowledge of Sellers, no event exists
          which, with the giving of notice or the lapse of time or both,
          would constitute a breach, default or event of default, or permit
          termination, modification or acceleration under any such policy. 
          There are no claims, actions, proceedings or suits arising out of
          or based upon any of such policies and no basis for any such
          claim, action, suit or proceeding exists.  All premiums have been
          paid on such policies as of the date of this Agreement.  The
          Company has been covered during its period of existence by
          insurance in scope and amount customary and reasonable for the
          businesses in which it has engaged during such period.  There
          have been no claims made during such period with respect to any
          insurance coverage of the Company.

               SECTION 3.15  Pension and Employee Benefit Matters.
                             ------------------------------------

               (a)  The Company has not maintained and has no obligation to
          contribute to any employee pension benefit plans, as defined in
          ERISA Section 3(2), including any multiemployer plan, as defined
          in ERISA Section 3(37).  The Company has no ERISA Affiliates. 
          Schedule 3.15 sets forth each Employee Welfare Benefit Plan 
          -------------
          maintained or contributed to by the Company and no such plan is
          self-insured or self-funded by the Company, ("Company Employee
          Welfare Benefit Plans").

               (b)  Any Company Employee Welfare Benefit Plan that is a
          "Group Health Plan" (as defined in Code Section 5000(b)(I)) has
          been administered in accordance with the requirements of Part 6
          of Subtitle B of Title I of ERISA and Code Section 4980B, and
          nothing done or omitted to be done in connection with maintenance
          or administration of any Company Employee Welfare Benefit Plan
          that is a Group Health Plan has made or will make the Company
          subject to any liability under Title I of ERISA or any excise Tax
          Liability under Code Section 4980B or has resulted or will result
          in any loss of income exclusion for a participant under Code
          Sections 105(h) or 106.

               (c)   The Company does not maintain, and has never
          maintained, and does not contribute, and has never contributed,
          and has never been required to contribute, to any employee
          benefit plan, as defined in ERISA Section 3(3), providing health
          or medical benefits for current or future retired or terminated
          employees, their spouses or dependents (other than in accordance
          with Code Section 4980B).  SCHEDULE 3.15 lists each employment, 
                                     -------------
          severance or other similar contract, arrangement or policy and
          each plan or arrangement (written or oral) providing for
          unemployment benefits, vacation benefits, deferred compensation,
          bonuses, stock options, stock appreciation rights or other forms
          of incentive compensation, reduced interest or interest free
          loans, mortgages, relocation assistance, or other benefits that
          (i) is not a Company Employee Welfare Benefit Plan; (ii) is
          entered into, maintained or contributed to by the Company; and
          (iii) covers any employee or former employee of the Company
          (collectively, the "Benefit Arrangements").  Copies of each such
          Benefit Arrangement (or, if unwritten, a written description of
          each such Benefit Arrangement) have been delivered by the Company
          to the Buyer.



                                     -14-

<PAGE>


               SECTION 3.16  Employees and Labor.  No executive or key 
                             -------------------
          employee is subject to any agreement, obligation, Order or other
          legal hindrance that impedes or might impede such executive or
          key employee from devoting his or her full business time to the
          affairs of the Company, and, if such person becomes an employee
          of Buyer, to the affairs of Buyer after the date of this
          Agreement.  The Company has, and has had, no pending labor
          relations problems or disputes or charges or complaints of unfair
          labor practices.  There are no threatened or alleged claims,
          investigations or requests for investigations or audits against
          the Company, nor are there any outstanding orders relating to the
          Company or any Seller with respect to any employment matter under
          any federal or state employment law or employment practices,
          including federal Title VII and related state protections.  There
          are no federal or state common law actions pending or, to the
          knowledge of Sellers, threatened, associated with or relating to
          any employee's or former employee's past or present employment
          with the Company or termination thereof.

               SECTION 3.17  Customer and Supplier Relationships.
                             ----------------------------------- 

               (a)  SCHEDULE 3.17(A) lists each customer that individually 
                    ----------------
          or with its Affiliates accounted for five percent or more of the
          Company's revenues during either the fiscal year ended
          December 31, 1997 or the three-month period ended March 31, 1998
          (the "Principal Customers").

               (b)  SCHEDULE 3.17(B) lists each supplier that individually 
                    ----------------
          or with its affiliates accounted for 10 percent or more of the
          Company's purchases of support services, supplies, or products
          during either the fiscal year ended December 31, 1997 or the
          three-month period ended March 31, 1998 (the "Principal
          Suppliers").

               (c)  The Company has good commercial working relationships
          with the Principal Customers and the Principal Suppliers and,
          since December 31, 1997, no Principal Customer or Principal
          Supplier has cancelled or otherwise terminated its relationship
          with the Company, materially decreased or limited its
          contribution of revenue to or support services, supplies or
          products supplied to, the Company, or threatened to take any such
          action.  Sellers have no basis to anticipate any problems with
          the Company's customer, supplier or business relationships.  To
          the knowledge of Sellers, no Principal Customer or Principal
          Supplier has any plans to reduce its contribution of revenue to
          or support services, supplies, or products supplied to the
          Company below levels prevailing since December 31, 1997, and the
          execution and delivery of this Agreement and the consummation of
          the transactions contemplated by this Agreement will not
          adversely affect the relationship of Buyer with any Principal
          Supplier after the date of this Agreement.

               SECTION 3.18  Environmental Matters.  The Company has 
                             ---------------------
          conducted its business and operations, and has occupied, used and
          operated the Premises in compliance with all Environmental
          Obligations.  The Company owns no real property.  To the
          knowledge of Sellers, all the Company's leased property is in
          full compliance with all Environmental Obligations.  Neither the
          Company nor any Seller on behalf of the Company has ever disposed


                                     -15-

<PAGE>

          of any Hazardous Materials except cleaning supplies, and such
          cleaning supplies have been disposed of in accordance with all
          applicable Environmental Obligations.  No Seller is aware of any
          claim or order, or notice of claim or order, asserting Liability
          of the Company or any Seller related to an Environmental
          Obligation.  The Company has not owned or used any underground or
          aboveground storage tanks.

               SECTION 3.19  Intellectual Property.  SCHEDULE 3.19 lists
                             ---------------------   -------------
          each item of Intellectual Property owned by the Company or which
          is used by the Company in the operation of its business.  The
          Company owns or has the legal right to use each such item of
          Intellectual Property, and none of such Intellectual Property is
          subject to any Encumbrance.  No other individual or entity has
          any claim or right to the Intellectual Property except as
          specifically allowed by the Company.  The Intellectual Property
          does not contain any material which may infringe on the
          intellectual property or proprietary rights of any third party. 
          The Intellectual Property is not the subject of any claim of
          infringement by any third party.

               SECTION 3.20  Brokers' Fees and Commissions.  None of
                             -----------------------------
          Sellers, the Company nor any of its respective directors,
          officers, partners, employees or agents has employed any
          investment banker, broker or finder in connection with the
          transactions contemplated hereby, and none of Sellers, the
          Company nor Buyer will have any liability to any such Persons on
          account of any brokerage, finders or similar fee payable with
          respect to the transactions contemplated by this Agreement.

               SECTION 3.21 Acquisition for Investment.  Sellers are 
                            --------------------------
          acquiring the ICG Shares pursuant to this Agreement for their own
          account as principals, for investment purposes only, and not with
          a view to, or for, resale, distribution or fractionalization
          thereof, in whole or in part, and no other Person has a direct or
          indirect beneficial interest in such ICG Shares.  Sellers each
          acknowledge and understand that the offering and sale of the ICG
          Shares pursuant to this Agreement are intended to be exempt from
          registration under the Securities Act by virtue of Section 4(2)
          thereof and the provisions of Regulation D promulgated thereunder
          and, therefore, cannot be resold unless they are registered under
          the Securities Act or unless an exemption from registration is
          available. In furtherance thereof, Sellers joint and severally
          represent and warrant to and agree with Buyer and each other
          Seller that:

               (a)  each Seller has the financial ability to bear the
          economic risk for this investment, has adequate means for
          providing for its current needs and contingencies and has no need
          for liquidity with respect to the investment in such ICG Shares;

               (b)  Allen is an "accredited investor" as that term is
          defined in Rule 501(a) of Regulation D under the Securities Act;

               (c)  each Seller has been furnished with a copy of ICG's
          Annual Report on Form 10-K for the fiscal years ended
          September 30, 1996, and December 31, 1997, Transition Report on
          Form 10-K for the period ended December 31, 1996, Forms 10-Q for
          the quarters ended March 31, 1997, June 30, 1997, September 30,
          1997 and March 31, 1998, proxy statements and Forms 8-K filed in


                                     -16-

<PAGE>


          1997 and 1998 (collectively, the "Documents") and has evaluated
          the risks of acquiring the ICG Shares based on the information
          contained therein and in this Agreement;

               (d)  each Seller has been given the opportunity to ask
          questions of, and receive answers from, the management of ICG
          concerning the terms, conditions and other matters pertaining to
          the investment in the ICG Shares, and has been given the
          opportunity to obtain such additional information necessary to
          verify the accuracy of the information contained in the Documents
          in order for Sellers to evaluate the merits and risks of the
          acquisition of such ICG Shares, and has not been furnished with
          any other offering literature or prospectus except as described
          herein;

               (e)  none of Sellers has been furnished with any oral or
          written representation or oral or written information in
          connection with the offering of such ICG Shares that is not
          contained in the Documents or this Agreement; and

               (f)  each Seller has such knowledge and experience in
          financial and business matters as to be capable of evaluating the
          merits and risks of an acquisition of such ICG Shares and of
          making an informed investment decision with respect thereto.

               SECTION 3.22  Disclosure.
                             ----------

               (a)  None of the documents or information provided to Buyer
          by the Company, any of Sellers or any agent or employee of the
          Company in the course of Buyer's due diligence investigation and
          the negotiation of this Agreement and Article III of this
          Agreement and the disclosure SCHEDULES referred to in Article III
                                       ---------
          contains any known untrue statement of any material fact or omits
          to state a material fact necessary in order to make the
          statements contained in this Agreement or in such documents,
          information or SCHEDULES not misleading.  There is no known fact or
                         ---------   
          circumstance which materially adversely affects the business, 
          prospects, condition, affairs or operations of the Company or any 
          properties or assets of the Company which has not been set forth in 
          this Agreement or in such documents, information or SCHEDULES.
                                                              ---------

          (b)  Nothing in the disclosure SCHEDULES referred to in 
                                         ---------
          Article III will be deemed adequate to disclose an exception to a
          representation or warranty made in this Agreement unless the
          applicable disclosure SCHEDULE identifies the exception with 
                                --------
          particularity and describes the relevant facts in reasonable
          detail.  Without limiting the generality of the foregoing, the
          mere listing (or inclusion of a copy) of a document or other item
          will not be deemed adequate to disclose an exception to a
          representation or warranty made in this Agreement (unless the
          representation or warranty has to do with the existence of the
          document or other item itself).

 
                                     -17-

<PAGE>

                                      ARTICLE IV
                       REPRESENTATIONS AND WARRANTIES OF BUYER

               Buyer represents and warrants to Sellers as follows, as of
          the date of this Agreement:

               SECTION 4.1  Organization and Qualification, etc.  Buyer is
                            -----------------------------------
          a corporation duly organized, validly existing and in good
          standing under the laws of the State of Colorado and has
          requisite corporate power and authority to own, lease and operate
          its properties and assets and to carry on its business as it is
          now being conducted.  Buyer is duly qualified to do business and
          is in good standing in each jurisdiction where the nature of the
          business conducted by it, or the properties leased or operated by
          it make such qualification necessary.

               SECTION 4.2  Authority Relative to Agreement.  Buyer has the
                            -------------------------------
          full and absolute right, corporate power and authority and legal
          capacity to execute, deliver and perform this Agreement and all
          Other Buyer Agreements, and to consummate the transactions
          contemplated on its part by this Agreement and the Other Buyer
          Agreements.  The execution and delivery of this Agreement by
          Buyer, and the consummation by Buyer of the transactions contem-
          plated on its part by this Agreement and the Other Buyer
          Agreements, have been duly authorized by Buyer's board of
          directors.  No other corporate approvals on the part of the board
          of directors or shareholders of Buyer are necessary to authorize
          the execution and delivery of this Agreement, and the Other Buyer
          Agreements.  This Agreement constitutes, and the Other Buyer
          Agreements when executed and delivered by the parties thereto
          will constitute, the legal, valid and binding obligations of, and
          will be enforceable in accordance with their respective terms
          against, Buyer, except as such enforcement is subject to the
          effect of (i) any applicable bankruptcy, insolvency,
          reorganization or similar laws relating to or affecting
          creditors' rights generally, and (ii) general principles of
          equity, including concepts of reasonableness, good faith and fair
          dealing, and other similar doctrines affecting the enforceability
          of agreements generally (regardless of whether considered in a
          proceeding in equity or law).

               SECTION 4.3  Non-Contravention.  Except as set forth on 
                            -----------------
          SCHEDULE 4.3, the execution and delivery of this Agreement and 
          ------------
          the Other Buyer Agreements and the consummation by Buyer of the
          transactions contemplated by this Agreement and by the Other
          Buyer Agreements will not, (a) violate any provision of the
          Articles of Incorporation or Bylaws of Buyer, or (b) violate, or
          result, with the giving of notice or the lapse of time or both,
          in a violation of, any provision of, or result in the accelera-
          tion of or entitle any party to accelerate (whether after the
          giving of notice or lapse of time or both) any obligation under,
          or result in the creation or imposition of any encumbrance upon
          any of the properties of Buyer pursuant to any provision of any
          indenture, mortgage, deed of trust, lien, agreement, Permit,
          license or instrument or any arrangement to which Buyer is a
          party or by which any of its assets are bound or to which any of
          its assets are subject and do not and will not violate or
          conflict with any other material restriction of any kind or char-
          acter to which Buyer is subject or by which any of its assets may
          be bound, or (c) violate in any material respect any Legal
          Requirement to which Buyer is subject.



                                     -18-

<PAGE>


               SECTION 4.4  Government Approvals.  No consent, 
                            --------------------
          authorization, order or approval of, or filing or registration
          with, any governmental commission, board or other regulatory body
          is required for or in connection with the execution and delivery
          of this Agreement and the Other Buyer Agreements by Buyer, the
          execution and delivery of this Agreement by Buyer, and the
          consummation by Buyer of the transactions contemplated by this
          Agreement and the Other Buyer Agreements.

               SECTION 4.5  Brokers.  All negotiations relative to this 
                            -------
          Agreement and the transactions contemplated by this Agreement
          have been carried out by Buyer directly with Sellers and the
          Company, without the intervention of any person on behalf of
          Buyer in such manner as to give rise to any valid claim by any
          Person against Buyer or any Seller for a finder's fee, brokerage
          commission, or similar payment.

               SECTION 4.6  Purchase for Investment.  Buyer is acquiring
                            -----------------------
          the Interests for its own account for investment purposes and not
          with a view to distribution of the Interests.  Buyer has such
          knowledge and experience in financial and business matters so as
          to be capable of evaluating the merits and risks of its
          investment in the Interests.  Buyer is an "accredited investor"
          as that term is defined in Rule 501(a) of Regulation D under the
          Securities Act.  Buyer will not, directly or indirectly, dispose
          of the Interests except in compliance with applicable federal and
          state securities laws.

               SECTION 4.7  SEC Reports and Nasdaq Compliance.  Since
                            ---------------------------------
          January 1, 1996, ICG has made in a timely manner all material
          filings (the "SEC Reports") required to be made by it under the 
          Securities Act and the Exchange Act.  The SEC Reports, when
          filed, complied in all material respects with all applicable
          requirements of the Securities Act and the Exchange Act and the
          securities laws, rules and regulations of any applicable state
          and pursuant to any material Legal Requirement and did not
          contain an untrue statement of a material fact or omit to state a
          material fact required to be stated therein or necessary in order
          to make the statements made therein, in light of the
          circumstances under which they were made, not misleading.  Buyer
          has delivered or made accessible to Sellers true, accurate and
          complete copies of the SEC Reports which were filed by ICG with
          the SEC since January 1, 1996.  Buyer has taken or will take all
          necessary actions to ensure the eligibility of the ICG Shares for
          trading on the Nasdaq Market.


                                      ARTICLE V
                                PRE-CLOSING COVENANTS

               The parties agree as follows with respect to the period
          between the execution of this Agreement and the Closing (or
          subsequent thereto, as applicable).

               SECTION 5.1  General.  Each of the parties will use its 
                            -------
          commercially reasonable efforts to take all actions necessary,
          proper or advisable in order to consummate and make effective the
          transactions contemplated by this Agreement (including the
          satisfaction, but not the waiver, of the closing conditions set
          forth in Article VII) and the other agreements contemplated


                                     -19-

<PAGE>

          hereby.  Without limiting the foregoing, Sellers and Buyer will,
          and Sellers will cause the Company to, give any notices, make any
          filings and obtain any consents, authorizations or approvals
          needed to consummate the transactions contemplated by this
          Agreement.

               SECTION 5.2  Operation and Preservation of Business. 
                            --------------------------------------
          Sellers will not cause or permit the Company to:  (i) incur or
          permit any liability other than a Permitted Liability; (ii)
          dispose of any assets that are, individually or in the aggregate,
          material to the Company; (iii) engage in any practice, take any
          action or enter into any transaction outside the ordinary course
          of its business consistent with past practice; (iv) make any
          payment or transfer to or for the benefit of any Seller (other
          than salaries paid to any Seller in amounts consistent with, and
          in all other respects in accordance with, past practice); or (v)
          make any distribution or payment in respect of any of the
          Interests; provided, however, that in no event will any action be
          taken or fail to be taken or any transaction be entered into
          which would result in a breach of any representation, warranty or
          covenant of any Seller.

               SECTION 5.3  Full Access.  Sellers will cause the Company to
                            -----------
          permit Buyer and its agents to have full access at all reasonable
          times, and in a manner so as not to interfere with the normal
          business operations of the Company, to all Premises, properties,
          personnel, books, records (including Tax records), contracts and
          documents of or pertaining to the Company.

               SECTION 5.4  Notice of Developments.  Sellers will give
                            ----------------------
          prompt written notice to Buyer of any material development which
          occurs after the date of this Agreement and affects the business,
          Assets, liabilities, financial condition, operations, results of
          operations, future prospects, representations, warranties,
          covenants or disclosure SCHEDULES of the Company.  No such
                                  ---------
          written notice, however, will be deemed to amend or supplement
          any disclosure SCHEDULES or to prevent or cure any 
                         ---------
          misrepresentation, breach of warranty or breach of covenant;
          provided that (a) if such written notice issued to Buyer prior to
          the Closing discloses a breach by any Seller of any of Sellers'
          representations, warranties or covenants; (b) Buyer waives such
          breach under Section 7.1, and (c) the Closing occurs, Sellers
          shall have no liability for such breach.

               SECTION 5.5  Exclusivity.  For a period ending on the
                            -----------
          earlier of (a) the date 60 days after execution of this Agreement
          by Buyer and Sellers and (b) 10 Business Days after the date all
          regulatory approvals and other third party consents required to
          consummate the transactions contemplated by this Agreement are
          obtained, no Seller will, and no Seller will cause or permit the
          Company to, (x) solicit, initiate or encourage the submission of
          any proposal or offer from any Person relating to the acquisition
          of any Interests or other equity interests, or any portion of the
          assets of, the Company (including any acquisition structured as a
          merger, consolidation or share exchange), (y) participate in any
          discussions or negotiations regarding, furnish any information
          with respect to, assist or participate in or facilitate in any
          other manner any effort or attempt by any Person to do or seek
          any of the foregoing or (z) provide any information concerning
          the Company or its business or assets to any Person in connection
          with any of the foregoing.  No Seller will vote his Interest in
          favor of any such transaction.  Seller's Agent will notify Buyer
          immediately if any Person makes any proposal, offer, inquiry or


                                     -20-

          <PAGE>

          contact with respect to any of the foregoing and will provide
          Buyer such details of such offer as Buyer may reasonably request. 
          This Section 5.5 will survive the termination of this Agreement.

               SECTION 5.6  Announcements.  Prior to the Closing, except as
                            -------------
          may be required by law (including in the case of Buyer,
          disclosure requirements under applicable securities laws), no
          party shall issue any press release or make any public
          announcement relating to the subject matter of this Agreement
          without the prior written approval of the other parties.

               SECTION 5.7  Payment By Sellers of Employee Claims and Other
                            -----------------------------------------------
          Expenses.  Sellers prior to or concurrently with the Closing will 
          ---------
          pay in cash all claims (other than claims for earned commissions) of
          employees or former employees of the Company arising out of events
          or circumstances occurring prior to or as a result of the Closing.

               SECTION 5.8  Closing Date Liabilities and Distribution. 
                            -----------------------------------------
          Prior to the Closing Date or concurrently with the Closing,
          Sellers shall pay in full in cash all known Closing Date
          Liabilities, the amount of which is then ascertainable, including
          any Seller Transaction Expenses in excess of $10,000 in the
          aggregate.  Following the Closing, Sellers shall promptly pay in
          full all other Closing Date Liabilities (including all Seller
          Transaction Expenses in excess of $10,000 in the aggregate) as
          such Liabilities become due.  Effective as of immediately prior
          to the Closing Date, Sellers hereby jointly and severally assume
          all Closing Date Liabilities, including all Seller Transaction
          Expenses in excess of $10,000 in the aggregate, without further
          action by Sellers, the Company or any other Person.  To the
          extent the Company has paid any Closing Date Liabilities,
          including any Seller Transaction Expenses in excess of $10,000 in
          the aggregate, which have not been reimbursed by Sellers to the
          Company prior to the Closing, Sellers will reimburse such Company
          in cash within two Business Days of the Closing Date.

               SECTION 5.9  Confidentiality.  Buyer, Sellers and the
                            ---------------
          Company shall keep, and shall cause their respective employees,
          agents, attorneys, accountants and other advisors to keep,
          confidential the existence, terms and conditions of this
          Agreement and all communications and discussions between or among
          Buyer, Sellers and the Company.  Without the consent of Buyer and
          Sellers' Agent, except as may be required by law (including, in
          the case of Buyer, disclosure requirements under applicable
          securities laws), neither Buyer, any Seller nor any of the
          Company shall make any disclosure of the information described in
          this Section 5.9.  Nothing contained in this Agreement shall be
          construed to prohibit any party from disclosing the information
          described in this Section 5.9 or any Confidential Information in
          connection with the institution or defense of any claim pursuant
          to this Agreement or other claims which may be the subject of
          judicial proceedings.

               SECTION 5.10  Consents and Approvals.  The parties hereto
                             ----------------------
          will cooperate with one another and use all commercially
          reasonable efforts to prepare all necessary documentation to
          effect promptly all necessary filings and to obtain all necessary
          Permits, consents, approvals, orders and authorizations of, or
          any exemptions by, all third parties and Governmental Authorities
          necessary to consummate the transactions contemplated by this
          Agreement.  Each party will keep the other parties apprised of
          the status of any inquiries made of such party by any


                                     -21-

          <PAGE>

          Governmental Authority or members of their respective staffs with
          respect to this Agreement or the transactions contemplated
          hereby.


                                      ARTICLE VI
                                POST-CLOSING COVENANTS

               The parties agree as follows with respect to the period
          following the Closing.

               SECTION 6.1  Further Assurances.  In case at any time after 
                            ------------------
          the Closing any further action is necessary or desirable to carry
          out the purposes of this Agreement, each of the parties will take
          such further action (including the execution and delivery of such
          further instruments and documents) as any Other Party reasonably
          may request, all at the sole cost and expense of the requesting
          party (unless the requesting party is entitled to indemnification
          therefor under Article VIII).

               SECTION 6.2  Transition.  No Seller will take any action at 
                            ----------
          any time that is designed or intended to have the effect of
          discouraging any customer, supplier, lessor, licensor or other
          business associate of the Company from establishing or continuing
          a business relationship with the Company or any other Person,
          including Buyer, after the Closing.

               SECTION 6.3  Cooperation.  In the event and for so long as
                            -----------
          any party actively is contesting or defending against any action,
          suit, proceeding, hearing, investigation, charge, complaint,
          claim or demand in connection with (a) any transactions
          contemplated by this Agreement or (b) any fact, situation,
          circumstance, status, condition, activity, practice, plan,
          occurrence, event, incident, action, failure to act or
          transaction on or prior to the Closing Date involving any of the
          Assets of the Company or the Company's business, each of the
          other parties will cooperate with such party and its counsel in
          the contest or defense, make available their personnel, and
          provide such testimony and access to their books and records as
          shall be reasonably necessary in connection with the contest or
          defense, all at the sole cost and expense of the contesting or
          defending party (unless the contesting or defending party is
          entitled to indemnification therefor under Article VIII).

               SECTION 6.4  Confidentiality.  Sellers will treat and hold
                            ---------------
          as confidential all Confidential Information concerning Buyer and
          the Company's business or Assets, refrain from using any such
          Confidential Information and deliver promptly to Buyer or
          destroy, at the request and option of Buyer, all of such
          Confidential Information in its or their possession.

               SECTION 6.5  Post-Closing Announcements.  Following the 
                            --------------------------
          Closing, no Seller will issue any press release or make any
          public announcement relating to the subject matter of this
          Agreement without the prior written approval of Buyer.

               SECTION 6.6  Financial Statements.  Sellers will, upon
                            --------------------
          request of Buyer, cooperate on a reasonable basis with Buyer to
          produce such historical and on-going financial statements and


                                     -22-

          <PAGE>


          audits as Buyer may request.  Buyer will reimburse Sellers for
          any reasonable out-of-pocket costs incurred in providing such
          cooperation.

               SECTION 6.7  Satisfaction of Liabilities.  Promptly
                            ---------------------------
          following the Closing, Sellers will pay (and reimburse the
          Company, as applicable as provided in Section 5.8) and perform
          all Closing Date Liabilities (to the extent not paid at or prior
          to the Closing Date) and all Taxes attributable to or arising
          from the transactions contemplated by this Agreement.

               SECTION 6.8 Sales of ICG Shares.  Following the Closing
                           -------------------
          Date, Sellers will not sell any of the ICG Shares issued pursuant
          to this Agreement until and after the earlier of the date (the
          "Free Up Date") that is (a) the earlier of nine months after the
          Closing Date or April 1, 1999, or (b) such earlier date as Buyer
          and Sellers mutually agree in writing.  Following the Free Up
          Date, Sellers shall have no restriction under this Agreement on
          the transferability of the ICG Shares.

               SECTION 6.9 Restriction of Sellers' Activities.  No Seller
                           ----------------------------------
          nor any Affiliate or Associate of a Seller will, from the date of
          this Agreement until the Free Up Date, engage in the purchase or
          sale of, or any other transaction relating to, the common stock
          or other securities of Buyer or Buyer's Affiliates; provided that
          any such Person shall be permitted to purchase such common stock
          or other securities if such purchase is not associated with any
          other transaction intended to mitigate such Person's risk of loss
          on any other common stock or other securities of Buyer or Buyer's
          Affiliates.  For purposes of this Agreement, the term Associate
          means with respect to any Person, (i) an "associate" of such
          person within the meaning of Rule 12(b)-2 under the Securities
          Exchange Act of 1934, as amended; and (ii) in the case of a
          Person who is a human being, any other human being related to
          such Person by consanguinity within the third degree or in a step
          or adoptive relationship within such third degree.


                                     ARTICLE VII
                                CONDITIONS TO CLOSING

               SECTION 7.1  Conditions to Obligation of Buyer.  The
                            ---------------------------------
          obligation of Buyer to consummate the transactions contemplated
          by this Agreement is subject to satisfaction of the following
          conditions:

               (a)  each Seller's representations and warranties shall be
          correct and complete at and as of the Closing Date and the
          Closing and any written notices delivered to Buyer pursuant to
          Section 5.4 and the subject matter thereof shall be satisfactory
          to Buyer;

               (b)  Sellers shall have performed and complied with all of
          their covenants hereunder required to be performed or complied
          with through the Closing;

               (c)  Sellers shall have given, or shall have caused the
          Company to give, all notices and procured, or shall have caused
          the Company to procure, all of the third-party consents,


                                     -23-

          <PAGE>


          authorizations and approvals (including all consents,
          authorizations and approvals by Governmental Authorities)
          required to consummate the transactions contemplated by this
          Agreement, all in form and substance reasonably satisfactory to
          Buyer;

               (d)  no action, suit or proceeding shall be pending or
          threatened before any Governmental Authority or any other Person
          wherein an unfavorable Order would (i) prevent consummation of
          any of the transactions contemplated by this Agreement (ii) cause
          any of the transactions contemplated by this Agreement to be
          rescinded following consummation or (iii) affect adversely the
          right of Buyer to own all of  the Interests of the Company or
          conduct the business of the Company, and no such Order shall be
          in effect.

               (e)  there shall have occurred no event, fact or
          circumstance that has had or could reasonably be expected to have 
          (i) a Material Adverse Effect or (ii) an adverse effect on
          Buyer's right to own the Interests free of Encumbrances and
          Taxes, or to conduct the Company's business substantially as such
          businesses were being conducted on March 31, 1998;

               (f)  Sellers shall have delivered to Buyer (i) a certificate
          to the effect that each of the conditions specified above in
          Sections 6.1(a) through (e) is satisfied in all respects, and
          (ii) good standing certificates, dated within ten days of the
          Closing, from the Secretaries of State of the States of Nevada
          and Colorado;

               (g)  the Other Seller Agreements shall have been executed
          and delivered by Sellers or other relevant Persons, as
          applicable;

               (h)  Buyer shall have received the resignations, effective
          as of the Closing, as requested in writing by Buyer, of each
          manager and other officer of the Company;

               (i)  Upon the written request of Buyer to Seller, Buyer
          shall have received from counsel to Seller an opinion in form and
          substance reasonably satisfactory to Buyer;

               (j)  assignments of the Interests in form and substance
          satisfactory to Buyer shall have been delivered by Sellers to
          Buyer;

               (k)  Sellers shall have satisfied, in form and substance
          satisfactory to Buyer, all liabilities to employees of the
          Company with respect to any phantom stock or equity arrangements
          relating to the Company, and any outstanding or alleged claim
          described in Section 5.7;

               (l)  Sellers shall have delivered to Buyer evidence,
          satisfactory to Buyer, of the termination of all indemnification
          agreements between the Company and any Seller;


               (m)  Sellers have executed (i) an agreement waiving their
          rights of first refusal under the Company's operating agreement


                                     -24-

          <PAGE>

          and (ii) an amendment of the Company's operating agreement
          amending the dissolution provisions of such agreement, each in
          form and substance satisfactory to Buyer;

               (n)  The note payable by the Company to Allen shall have
          been canceled contemporaneously with the Closing;

               (o)  Sellers shall have delivered, or caused the Company to
          deliver, to Buyer such other instruments, certificates and
          documents as are reasonably requested by Buyer in order to
          consummate the transactions contemplated by this Agreement, all
          in form and substance reasonably satisfactory to Buyer;

               (p)  Buyer shall have obtained the consent or waiver of
          CSW/ICG ChoiceCom, L.P., C3 Communications, Inc., and Central and
          Southwest Corporation of their rights with respect to a portion
          of the Company's business to be acquired at Closing;

               (q)  Sellers shall have delivered, or caused the Company to
          deliver, to Buyer UCC termination Statements with respect to UCC-
          1 financing statements filed by the Company as Debtor and
          National Factoring Services, Inc. as secured party filed (i) on
          May 14, 1997 as File No. 9708298 in the office of the Secretary
          of State of Nevada and (ii) on May 6, 1997 as File No.
          19972036585 in the office of the Secretary of State of Colorado;
          and

               (r)  Sellers shall have delivered, or caused the Company to
          deliver, to Buyer written termination of the Master Agreement for
          Purchase and Assignment of Accounts Receivable dated April 29,
          1997, between National Factoring Services, Inc. and the Company,
          the Disbursement Agreement dated May 15, 1997 between the
          Company, BellSouth Long Distance, Inc. and National Factoring
          Services, Inc., and any related agreements.

          Buyer in its sole discretion may waive any condition specified in
          this Section 7.1 at or prior to the Closing.

               SECTION 7.2  Conditions to Obligation of Sellers.  The 
                            -----------------------------------
          obligation of Sellers to consummate the transactions contemplated
          by this Agreement is subject to satisfaction of the following
          conditions:

               (a)  Buyer's representations and warranties shall be correct
          and complete at and as of the Closing Date and the Closing;

               (b)  Buyer shall have performed and complied with all of its
          covenants hereunder required to be performed or complied with
          through the Closing Date;

               (c)  no action, suit or proceeding shall be pending or
          threatened before any Governmental Authority or any other Person
          wherein an unfavorable Order would (i) prevent consummation of
          any of the transactions contemplated by this Agreement or
          (ii) cause any of the transactions contemplated by this Agreement
          to be rescinded following consummation.


                                     -25-

          <PAGE>

               (d)  Buyer shall have delivered to Sellers a certificate to
          the effect that each of the conditions specified above in
          Sections 7.2(a) through (c) is satisfied in all respects;

               (e)  the Other Buyer Agreements shall have been executed and
          delivered by Buyer;

               (f)  Buyer shall have paid and deposited the purchase price
          for the Interests pursuant to Section 2.2; and

               (g)  ICG shall have caused the ICG shares to be listed for
          trading on the Nasdaq Market.

          Sellers in their sole discretion may waive any condition
          specified in this Section 7.2 at or prior to the Closing.


                                     ARTICLE VIII
                       REMEDIES FOR BREACHES OF THIS AGREEMENT

               SECTION 8.1  Indemnification Provisions for Benefit of Buyer
                            -----------------------------------------------
          and the Company.
          ---------------

               (a)  If any Seller breaches (or if any Person other than
          Buyer alleges facts that, if true, would mean any Seller has
          breached) (i) any of the representations or warranties of any
          Seller contained herein and Buyer gives notice thereof to
          Sellers' Agent within the applicable Survival Period, or (ii) any
          covenants or agreements of any Seller contained herein or any
          agreements, representations, warranties or covenants of any
          Seller contained in any Other Seller Agreement and Buyer gives
          notice thereof to Sellers' Agent, then, subject to Section 8.6,
          Allen and the Trust jointly and severally, and the Minority
          Members severally, will indemnify and hold harmless Buyer and the
          Company from and against any Adverse Consequences Buyer or the
          Company may suffer resulting from, arising out of, relating to or
          caused by any of the foregoing regardless of whether the Adverse
          Consequences are suffered during or after any applicable Survival
          Period; provided, however, that the maximum amount with respect
          to which any Minority Seller shall be required to indemnify Buyer
          under this Article VIII shall not exceed an amount equal to the
          product of (i) the amount of such Adverse Consequences suffered
          by Buyer multiplied by (ii) a fraction, the numerator of which is
          the Interests owned by such Minority Seller as reflected on
          SCHEDULE 3.3 and the denominator of which is 27.38.  In 
          ------------
          determining solely the amount of Adverse Consequences suffered by
          Buyer or the Company for purposes of this Section 8.1, the
          representations and warranties of Sellers will not be qualified
          by "material," "materiality," "in all material respects," "best
          knowledge," "best of knowledge" or "knowledge" or words of
          similar import, or by any phrase using any such terms or words. 
          If any dispute arises concerning whether any indemnification is
          owing which cannot be resolved by negotiation among the parties
          within 30 days of notice of claim for indemnification from the
          party claiming indemnification to the party against whom such
          claim is asserted, the dispute will be resolved by arbitration
          pursuant to this Agreement.



                                     -26-

          <PAGE>

               (b)  Amounts needed to cover any indemnification claims
          resolved in favor of Buyer or the Company against any Seller
          during the Escrow Period will be paid to Buyer out of the ICG
          Shares escrowed pursuant to the Escrow Agreement, to the extent
          thereof.  For purposes of calculating the number of ICG Shares to
          be paid to Buyer to cover such indemnification claims, in each
          case the per share value of each ICG Share will be the volume
          weighted average price of the ICG Common Stock quoted on the
          Nasdaq Market for the five trading days ending two trading days
          prior to the date of expiration of the Reply Period or receipt of
          the Reply Notice, whichever is applicable.  Allen and the Trust
          will have joint and several Liability, and the Minority Members
          will be severally liable, pro rata according to their Interests,
          for any additional amounts needed to cover such claims, which
          amounts will be paid directly to Buyer.  At the end of the Escrow
          Period ICG Shares (valued as provided in this Section 8.1(b) as
          of the last Business Day falling within the Escrow Period) that
          may be needed to cover pending indemnification claims made by
          Buyer (such amounts to be determined by Buyer based upon the
          reasonable exercise of its business judgment) will be retained in
          the Escrow Account until such claims are resolved, and any excess
          of such retained ICG Shares on deposit in the Escrow Account will
          be distributed to Sellers upon the resolution of all such pending
          indemnification claims.  Nothing in this Section 8.1(b) will be
          construed to limit Buyer's right to indemnification to the ICG
          Shares on deposit in the Escrow Account.  Buyer and Sellers'
          Agent shall jointly give instructions to the Escrow Agent to
          carry out the intent of this Section 8.1(b).  Any disputes
          concerning the escrowed property will be settled by arbitration
          as provided in this Agreement.  Buyer will be responsible for the
          fees, charges and expenses payable to the Escrow Agent pursuant
          to Section 5(d) of the Escrow Agreement.

               SECTION 8.2  Indemnification Provisions for Benefit of
                            -----------------------------------------
          Sellers.
          -------
            If (a) Buyer breaches (or if any Person other than a Seller
          alleges facts that, if true, would mean Buyer has breached) any
          of its representations or warranties contained herein, and
          Seller's Agent gives notice of a claim for indemnification
          against Buyer within the applicable Survival Period, or (b) Buyer
          breaches (or if any Person other than a Seller alleges facts
          that, if true, would mean Buyer has breached) any of its
          covenants or agreements contained herein or any of its
          agreements, representations, warranties or covenants contained in
          any Other Buyer Agreement and Seller's Agent gives notice thereof
          to Buyer, then Buyer will indemnify and hold harmless Sellers
          from and against any Adverse Consequences Sellers may suffer
          which result from, arise out of, relate to, or are caused by the
          breach or alleged breach, regardless of whether the Adverse
          Consequences are suffered during or after the applicable Survival
          Period. In determining solely the amount of Adverse Consequences
          suffered by Sellers for purposes of this Section 8.2, the
          representations and warranties of Buyer shall not be qualified by
          "material," "materiality," "in all material respects," "best
          knowledge," "best of knowledge" or "knowledge" or words of
          similar import, or by any phrase using any such terms or words. 
          If any dispute arises concerning whether any indemnification is
          owing which cannot be resolved by negotiation among the parties
          within 30 days of notice of claim for indemnification from the
          party claiming indemnification to the party against whom such
          claim is asserted, the dispute will be resolved by arbitration
          pursuant to this Agreement.


                                     -27-

          <PAGE>

               SECTION 8.3  Matters Involving Third Parties.
                            -------------------------------
               (a)  If any Person not a party to this Agreement (including,
          without limitation, any Governmental Authority) notifies any
          party (the "Indemnified Party") with respect to any matter (a
          "Third Party Claim") which may give rise to a claim for
          indemnification against any other party (the "Indemnifying
          Party"), then the Indemnified Party will notify each Indemnifying
          Party thereof in writing within 15 days after receiving such
          notice.  No delay on the part of the Indemnified Party in
          notifying any Indemnifying Party will relieve the Indemnifying
          Party from any obligation hereunder unless (and then solely to
          the extent) the Indemnifying Party thereby is prejudiced by such
          delay.

               (b)  Any Indemnifying Party will have the right, at its sole
          cost and expense, to defend the Indemnified Party against the
          Third Party Claim with counsel of its choice satisfactory to the
          Indemnified Party so long as (i) the Indemnifying Party notifies
          the Indemnified Party in writing within 10 days after the
          Indemnified Party has given notice of the Third Party Claim that
          the Indemnifying Party will indemnify the Indemnified Party from
          and against the entirety of any Adverse Consequences the
          Indemnified Party may suffer resulting from, arising out of,
          relating to or caused by the Third Party Claim, (ii) the
          Indemnifying Party provides the Indemnified Party with evidence
          reasonably acceptable to the Indemnified Party that the
          Indemnifying Party will have the financial resources to defend
          against the Third Party Claim and fulfill its indemnification
          obligations hereunder, (iii) the Third Party Claim involves only
          money damages and does not seek an injunction or other equitable
          relief, (iv) settlement of, or an adverse judgment with respect
          to, the Third Party Claim is not, in the good faith judgment of
          the Indemnified Party, likely to establish a precedential custom
          or practice materially adverse to the continuing business
          interests of the Indemnified Party, and (v) the Indemnifying
          Party conducts the defense of the Third Party Claim actively and
          diligently.  If the Indemnifying Party does not assume control of
          the defense or settlement of any Third Party Claim in the manner
          described above, it will be bound by the results obtained by the
          Indemnified Party with respect to the Third Party Claim.  In the
          event the Third Party Claim does seek an injunction or other
          equitable relief, this Section 8.3(b) will not apply.

               (c)  So long as the Indemnifying Party is conducting the
          defense of the Third Party Claim in accordance with
          Section 8.3(b) above, (i) the Indemnified Party may retain
          separate co-counsel at its sole cost and expense and participate
          in the defense of the Third Party Claim, (ii) the Indemnified
          Party will not consent to the entry of any judgment or enter into
          any settlement with respect to the Third Party Claim without
          obtaining (A) an entry of dismissal, with prejudice, or an entry
          of dismissal, without prejudice and a covenant not to sue (if
          legal action is instituted), (B) the full and unconditional
          release of the Indemnifying Party from all liability in respect
          of such Third Party Claim and (C) the prior written consent of
          the Indemnifying Party (not to be withheld unreasonably), and
          (iii) the Indemnifying Party will not consent to the entry of any
          judgment or enter into any settlement with respect to the Third
          Party Claim without obtaining (A) an entry of dismissal, with
          prejudice, or an entry of dismissal, without prejudice and a
          covenant not to sue (if legal action is instituted), (B) the full


                                     -28-

          <PAGE>

          and unconditional release of the Indemnified Party from all
          liability in respect of such Third Party Claim and (C) the prior
          written consent of the Indemnified Party (not to be withheld
          unreasonably).

               (d)  In the event any of the conditions in Section 8.3(b) is
          or becomes unsatisfied, or if Section 8.3(b) does not apply,
          (i) the Indemnified Party may defend against, and consent to the
          entry of any judgment or enter into any settlement with respect
          to, the Third Party Claim in any manner it reasonably may deem
          appropriate (and the Indemnified Party need not consult with, or
          obtain any consent from, any Indemnifying Party in connection
          therewith), (ii) the Indemnifying Party will reimburse the
          Indemnified Party promptly and periodically for the costs of
          defending against the Third Party Claim (including reasonable
          attorneys' fees and expenses), and (iii) the Indemnifying Party
          will remain responsible for any Adverse Consequences the
          Indemnified Party may suffer resulting from, arising out of,
          relating to or caused by the Third Party Claim to the fullest
          extent provided in this Article VIII.

               SECTION 8.4  Survival.  The representations and warranties
                            --------
          made in this Agreement or in any other agreement referred to in
          this Agreement, or in any certificate or other document delivered
          pursuant to this Agreement or in connection with this Agreement
          will survive the Closing Date for a period of two years from the
          Closing Date, except that (a) the representations and warranties
          of Sellers in Sections 3.1, 3.3 and 3.4, and of Buyer in Sections
          4.1 and 4.2, will survive forever and (b) the representations and
          warranties of Sellers in Sections 3.8, 3.15, and 3.18 will
          survive until the expiration of all applicable statutes of
          limitations with respect to any such claims that could be brought
          regarding such matters (including any extensions of any statutes
          of limitations), plus a period of 60 days.  No party will have
          any obligation to indemnify any person pursuant to this Agreement
          with respect to any breach of a representation or warranty unless
          a specific claim has been validly made under this Agreement on or
          prior to the expiration of the applicable period set forth above. 
          The covenants and agreements of Sellers and Buyer made in this
          Agreement will survive the Closing Date indefinitely.

               SECTION 8.5  Limitations.
                            -----------
               (a)  The indemnification provisions of this Article will
          constitute the exclusive remedy by either party against the other
          arising by virtue of a breach of any agreement, representation,
          warranty, or covenant under this Agreement, absent fraud.

               (b)  The Company will not have any duty to indemnify any
          Seller or contribute funds for the benefit of any Seller.  Each
          Seller waives any right to indemnification or contribution from
          the Company.

               SECTION 8.6  Basket and Ceiling.
                            ------------------
               (a)  Except as provided in the last sentence of this Section
          8.6(a) and in Section 8.6(c), Buyer (and the Company, as
          applicable) will not be entitled to indemnification from Sellers
          under Section 8.1 or Section 8.3 unless and until, and then
          solely to the extent that, the aggregate amount of Adverse
          Consequences with respect to which Buyer or the Company would


                                     -29-

          <PAGE>

          otherwise be entitled to assert under Section 8.1 or Section 8.3,
          whichever is applicable, exceeds $50,000 (the "Basket Amount"). 
          When the aggregate amount of such Adverse Consequences exceeds
          the Basket Amount, Buyer (and the Company, as applicable) will be
          entitled to indemnification under Section 8.1 or Section 8.3, as
          applicable, for all Adverse Consequences in excess of the Basket
          Amount.

               (b)  Sellers will be required to indemnify Buyer under this
          Article VIII for all Adverse Consequences suffered as a result of
          the breach of any of the representations, warranties or covenants
          set forth in Article III or elsewhere in this Agreement, other
          than the representations, warranties and covenants set forth in
          Sections 3.1, 3.3, 3.4, 3.8, 3.15 and 3.18, only in an amount, in
          the aggregate for all or any of such breaches, not in excess of
          $1,500,000.

               (c)  Except as provided in the second sentence of this
          Section 8.6(c), Sellers will be required to indemnify Buyer
          without limitation under this Article VIII for all Adverse
          Consequences suffered as a result of one or more breaches of the
          representations and warranties set forth in Sections 3.1, 3.3,
          3.4, 3.8, 3.15 and 3.18, and there shall be no monetary
          limitation on the amount of such indemnification payable by
          Sellers nor shall Section 8.6(a) (relating to the Basket Amount)
          apply to such breaches.  Buyer agrees, however, that the
          aggregate amount of such indemnification shall in no event exceed
          the amount of the Purchase Price payable by Buyer to Sellers
          under this Agreement in consideration of the Interests.


                                      ARTICLE IX
                                     TERMINATION

               SECTION 9.1  Termination of Agreement.  The parties may 
                            ------------------------
          terminate this Agreement as provided below:

               (a)  Buyer and Sellers' Agent may terminate this Agreement
          by mutual written consent at any time prior to the Closing;

               (b)  Buyer may terminate this Agreement by giving written
          notice to Sellers' Agent at any time prior to the Closing (i) in
          the event any Seller has materially breached any agreement,
          representation, warranty or covenant contained in this Agreement,
          Buyer has notified Sellers' Agent of the breach, and the breach
          has not been cured within 10 days after the notice of breach; or
          (ii) if the Closing has not occurred on or before the date that
          is 60 days after the date of this Agreement because of the
          failure of any condition precedent to Buyer's obligations to
          consummate the Closing (unless the failure results primarily from
          Buyer breaching any agreement, representation, warranty or
          covenant contained in this Agreement in any material way);

               (c)  Sellers may terminate this Agreement by Seller's Agent
          giving written notice to Buyer at any time prior to the Closing
          (i) if Buyer has breached any agreement, representation, warranty
          or covenant contained in this Agreement, Sellers' Agent has
          notified Buyer of the breach, and the breach has not been cured


                                     -30-

          <PAGE>

          within 10 days after the notice of breach, or (ii) if the Closing
          has not occurred on or before the date that is 60 days after the
          date of this Agreement because of the failure of any condition
          precedent to Sellers' obligations to consummate the Closing
          (unless the failure results primarily from any Seller breaching
          any agreement, representation, warranty or covenant contained in
          this Agreement in any material way), or (iii) if the Closing has
          not occurred on or before the date that is 60 days after the date
          of this Agreement because of the failure of the condition
          precedent to Buyer's obligations to consummate the Closing set
          forth in Section 7.1(p).

               SECTION 9.2  Effect of Termination.  The termination of this
                            ---------------------
          Agreement by a party pursuant to Section 9.1 will in no way limit
          any obligation or liability of any other party based on or
          arising from a breach or default by such other party with respect
          to any of its agreements, representations, warranties or
          covenants contained in this Agreement, and the terminating party
          will be entitled to seek all relief to which it is entitled under
          applicable law.  The obligations of Sellers set forth in Section
          5.5 will survive the termination of this Agreement.

               SECTION 9.3  Confidentiality.  If this Agreement is 
                            ---------------
          terminated, each party will treat and hold as confidential all
          Confidential Information concerning the other parties which it
          acquired from such other parties in connection with this
          Agreement and the transactions contemplated hereby, and upon the
          request of Buyer or Sellers' Agent, as applicable, Buyer and
          Sellers will return to the other all such Confidential
          Information within its possession.


                                      ARTICLE X
                                    MISCELLANEOUS

               SECTION 10.1  No Third-Party Beneficiaries.  This Agreement 
                             ----------------------------
          will not confer any rights or remedies upon any Person other than
          the parties and their respective successors and permitted
          assigns.


               SECTION 10.2  Entire Agreement.  This Agreement (including
                             ----------------
          the EXHIBITS, SCHEDULES and documents referred to herein) 
              -------------------
          constitutes the entire agreement among the parties and supersedes
          any prior understandings, agreements or representations by or
          among the parties, written or oral, and the letter agreement
          dated April 20, 1998 between Allen on behalf of Sellers and the
          Company, on the one hand, and Buyer, on the other, to the extent
          they relate in any way to the subject matter hereof.

               SECTION 10.3  Succession and Assignment.  This Agreement 
                             -------------------------
          will be binding upon and inure to the benefit of the parties and
          their respective successors and permitted assigns.  Neither
          Seller nor Buyer may assign this Agreement or any of his or her
          rights, interests or obligations hereunder without the prior
          written approval of the other.

               SECTION 10.4  Counterparts.  This Agreement may be executed
                             ------------
          in any number of counterparts, each of which shall be deemed an
          original and all of which together shall be deemed to be one and


                                     -31-

          <PAGE>


          the same instrument.  The execution of a counterpart of the
          signature page to this Agreement will be deemed the execution of
          a counterpart of this Agreement.  The delivery of this Agreement
          may be made by facsimile, and facsimile signatures shall be
          treated as original signatures for all applicable purposes.

               SECTION 10.5  Headings, Terms.  The section headings
                             ---------------
          contained in this Agreement are inserted for convenience only and
          will not affect in any way the meaning or interpretation of this
          Agreement.  Terms used with initial capital letters will have the
          meanings specified, applicable to both singular and plural forms,
          for all purposes of this Agreement.  All pronouns (and any
          variation) will be deemed to refer to the masculine, feminine or
          neuter, as the identity of the Person may require.  The singular
          or plural includes the other, as the context requires or permits. 
          The word include (and any variation) is used in an illustrative
          sense rather than a limiting sense.  The word day means a
          calendar day.

               SECTION 10.6  Notices.  All notices, requests, demands, 
                             -------
          claims, and other communications hereunder will be in writing.
          Any notice, request, demand, claim, or other communication
          hereunder shall be deemed duly given if it is sent by registered
          or certified mail, return receipt requested, postage prepaid, or
          by courier, telecopy or facsimile, and addressed to the intended
          recipient as set forth below:


          If to
          Sellers:                      Copy to:

          Addressed to the              Olona & Associates, P.C.
          Sellers' Agent at:            Attention: Richard G. Olona, Esq.
          G. Kelley Allen               621 Seventeenth Street, Suite 2540
          5485 South Hoyt Street        Denver, Colorado 80293
          Littleton, Colorado 80123     Telecopy: (303) 297-2927
          Telecopy: (303) 973-7316

          If to Buyer:                  Copy to:

          ICG Telecom Group, Inc.       Sherman & Howard L.L.C.
          161 Inverness Drive West      633 Seventeenth St., Suite 3000
          Englewood, Colorado 80112     Denver, Colorado  80202
          Attn:  H. Don Teague, Esq.    Attn: Robert Mintz, Esq.
          Executive Vice President,     Telecopy:  (303) 298-0940
           General Counsel and Secretary
          Telecopy:  (303) 414-8884

          Notices will be deemed given seven days after mailing if sent by
          certified mail, when delivered if sent by courier, and upon
          receipt of confirmation by person or machine if sent by telecopy
          or facsimile transmission.  Any party may change the address to


                                     -32-

          <PAGE>

    
          which notices, requests, demands, claims and other communications
          hereunder are to be delivered by giving the other parties notice
          in the manner herein set forth.

               SECTION 10.7  GOVERNING LAW.  THIS AGREEMENT WILL BE 
                             -------------
          GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE DOMESTIC LAWS OF
          THE STATE OF COLORADO WITHOUT GIVING EFFECT TO ANY CHOICE OR
          CONFLICT OF LAW PROVISION OR RULE (WHETHER OF THE STATE OF
          COLORADO OR ANY OTHER JURISDICTION) THAT WOULD CAUSE THE
          APPLICATION OF THE LAWS OF ANY JURISDICTION OTHER THAN THE STATE
          OF COLORADO.

               SECTION 10.8  Amendments and Waivers.  No amendment of any 
                             ----------------------
          provision of this Agreement shall be valid unless the same is in
          writing and signed by Buyer and Sellers' Agent.  No waiver by any
          party of any default, misrepresentation or breach of warranty or
          covenant hereunder, whether intentional or not, will be deemed to
          extend to any prior or subsequent default, misrepresentation or
          breach of warranty or covenant hereunder or affect in any way any
          rights arising by virtue of any prior or subsequent such
          occurrence, and no waiver will be effective unless set forth in
          writing and signed by the party against whom such waiver is
          asserted.

               SECTION 10.9  Severability.  Any term or provision of this 
                             ------------
          Agreement that is invalid or unenforceable in any situation in
          any jurisdiction shall not affect the validity or enforceability
          of the remaining terms and provisions hereof or the validity or
          enforceability of the offending term or provision in any other
          situation or in any other jurisdiction.

               SECTION 10.10  Expenses.  Except as otherwise provided in 
                              --------
          Section 9.2, (a) Buyer shall bear its own costs and expenses
          (including, without limitation, legal fees and expenses) incurred
          either before or after the date of this Agreement in connection
          with this Agreement or the transactions contemplated hereby, and
          all filing fees payable to any Governmental Authority in
          connection with the transaction, and upon receipt of evidence,
          reasonably satisfactory to Buyer, of liability therefor or
          payment thereof, Buyer shall reimburse Sellers, pay, or bear
          liability for, as the case may be, all Seller Transaction
          Expenses not to exceed $10,000 in the aggregate; and (b) Sellers
          will bear all costs and expenses (including, without limitation,
          all legal, accounting and tax related fees and expenses, all
          fees, commissions, expenses and other amounts payable to any
          broker, finder or agent) incurred by the Company prior to the
          Closing or by any Seller either before or after the date of this
          Agreement in connection with this Agreement or the transactions
          contemplated hereby (collectively, "Seller Transaction
          Expenses"); provided that Sellers shall pay or have liability for
          Seller Transaction Expenses only to the extent such Seller
          Transaction Expenses exceed $10,000 in the aggregate.  Any Seller
          Transaction Expenses payable by Sellers under this Agreement
          relating to amounts incurred by the Company prior to the Closing
          shall be reimbursed in cash by Sellers to the Company.

               SECTION 10.11  Arbitration.  Any disputes arising under or
                              -----------
          in connection with this Agreement, including, without limitation,
          those involving claims for specific performance or other
          equitable relief, will be submitted to binding arbitration under
          the Commercial Arbitration Rules of the American Arbitration
          Association under the authority of federal and state arbitration


                                     -33-

          <PAGE>


          statutes, and shall not be the subject of litigation in any
          forum.  EACH PARTY, BY SIGNING THIS AGREEMENT, VOLUNTARILY,
          KNOWINGLY AND INTELLIGENTLY WAIVES ANY RIGHTS SUCH PARTY MAY
          OTHERWISE HAVE TO SEEK REMEDIES IN COURT OR OTHER FORUMS,
          INCLUDING THE RIGHT TO JURY TRIAL. The arbitration will be
          conducted only in Denver, Colorado, before a single arbitrator
          selected by the parties or, if they are unable to agree on an
          arbitrator, before a panel of three arbitrators, one selected by
          Buyer, one selected by Sellers' Agent and the third selected by
          the other two arbitrators.  The arbitrators shall have full
          authority to order specific performance and award damages and
          other relief available under this Agreement or applicable law,
          but shall have no authority to add to, detract from, change or
          amend the terms of this Agreement or existing law.  All
          arbitration proceedings, including settlements and awards, shall
          be confidential.  The decision of the arbitrators will be final
          and binding, and judgment on the award by the arbitrators may be
          entered in any court of competent jurisdiction.  THIS SUBMISSION
          AND AGREEMENT TO ARBITRATE WILL BE SPECIFICALLY ENFORCEABLE.  The
          arbitrator will have no power to award punitive or exemplary
          damages, to ignore or vary the terms of this Agreement or any
          Other Buyer Agreement or Other Seller Agreement, and will be
          bound to apply controlling law.  The party who prevails on entry
          of the award of judgment will be entitled to his or its costs and
          expenses, including reasonable attorney's fees incurred in
          connection with the arbitration.  A judgment upon the award may
          be entered in any court having jurisdiction.

               SECTION 10.12  Construction.  The parties have participated 
                              ------------
          jointly in the negotiation and drafting of this Agreement.  In
          the event an ambiguity or question of intent or interpretation
          arises, this Agreement will be construed as if drafted jointly by
          the parties and no presumption or burden of proof will arise
          favoring or disfavoring any party by virtue of the authorship of
          any of the provisions of this Agreement.  The parties intend that
          each representation, warranty and covenant contained herein will
          have independent significance.  If any party breaches any
          representation, warranty or covenant contained herein in any
          respect, the fact that there exists another representation,
          warranty or covenant relating to the same subject matter
          (regardless of the relative levels of specificity) which the
          party has not breached will not detract from or mitigate the fact
          that the party is in breach of the first representation, warranty
          or covenant.

               SECTION 10.13  Incorporation of Exhibits.  The EXHIBITS and
                              -------------------------       --------
          SCHEDULES identified in this Agreement are incorporated herein by
          ---------  
          reference and made a part hereof.

               SECTION 10.14  Representations as to Knowledge.  The 
                              -------------------------------
          representations and warranties contained in Article III of this
          Agreement will, in each and every case where a statement to the
          "knowledge" is required on behalf of any party to this Agreement,
          or where something is "known" by a party, be deemed to require
          that such statement be in good faith after reasonable
          investigation (including, in the case of Sellers, inquiry of the
          applicable employees of the Company), with due diligence, in the
          best efforts of such party.  Any reference to the "knowledge" of,
          or "known" by, Sellers shall refer to the knowledge of each of
          Sellers individually.



                                     -34-

          <PAGE>


               SECTION 10.15  Sellers' Agent.  Each Seller hereby
                              --------------
          authorizes and appoints Sellers' Agent as its, his or her
          exclusive agent and attorney-in-fact to act on behalf of each of
          them with respect to all matters which are the subject of this
          Agreement, including, without limitation, (a) receiving or giving
          all notices, instructions, other communications, consents or
          agreements that may be necessary, required or given hereunder and
          (b) asserting, settling, compromising, or defending, or
          determining not to assert, settle, compromise or defend, (i) any
          claims which any Seller may assert, or have the right to assert,
          against Buyer, or (ii) any claims which Buyer may assert, or have
          the right to assert, against any Seller.  Sellers' Agent hereby
          accepts such authorization and appointment.  Upon the receipt of
          written evidence satisfactory to Buyer to the effect that
          Sellers' Agent has been substituted as agent of Sellers by reason
          of his death, disability or resignation, Buyer shall be entitled
          to rely on such substituted agent to the same extent as it was
          theretofore entitled to rely upon Sellers' Agent with respect to
          the matters covered by this Section 10.15.  No Seller shall act
          with respect to any of the matters which are the subject of this
          Agreement except through Sellers' Agent.  Sellers acknowledge and
          agree that Buyer may deal exclusively with Sellers' Agent in
          respect of such matters, that the enforceability of this
          Section 10.15 is material to Buyer, and that Buyer has relied
          upon the enforceability of this Section 10.15 in entering into
          this Agreement. In the event Sellers' Agent declines to represent
          Sellers with respect to any matter delegated to Sellers' Agent
          under this Agreement, Sellers agree that the affirmative written
          determination of those Sellers holding more than 50 percent of
          the number of Interests held by all of Sellers, as set forth on
          SCHEDULE 3.3, will constitute the action of all of Sellers, and 
          ------------
          each Seller agrees that in such event it will be bound by the
          determination of such majority of Sellers and will not seek to
          challenge any such determination in any forum.


                              [SIGNATURE PAGE FOLLOWS.]


                                     -35-

          <PAGE>

               IN WITNESS WHEREOF, the parties hereto have executed this
          Agreement as of the date first above written.

                                   BUYER:

                                   ICG D.C. HOLDINGS, INC.

                                   By: 
                                   Name: 
                                   Title: 

                                   SELLERS:


                                   G. Kelley Allen

                                   G. Kelley Allen Trust u/a/d 1/14/93


                                   By:  G. Kelley Allen, Trustee


                                   Michele R. K. Fought

                                   Gordon B. Koch Daughters Trust


                                   By:  Carole K. Allen, Trustee
                                   By:  G. Kelley Allen, Attorney-in-Fact

                                   T & D Consulting, Inc.

                                   By:
                                   Name:  Thomas Sumbler
                                   Title:


                                   By:
                                   Name:  David Gandini
                                   Title:


                        [SIGNATURE PAGE TO PURCHASE AGREEMENT]

          <PAGE>

                                   SCHEDULE 3.10(b)
                                   ----------------
                     LIST OF PROPERTIES, CONTRACTS AND OTHER DATA

               1.   All items of equipment, machinery and other tangible
          personal property of the Company (including that which, as of the
          date of this Agreement, has no book value), and the original
          cost, depreciation and current book value of all such items which
          are included in the Latest Balance Sheet.

               2.   All guaranty, warranty and indemnity agreements with
          respect to products or services provided or delivered by the
          Company.

               3.   All contracts or agreements for the purchase, sale,
          rental, rental/purchase or sale, lease or lease/purchase or sale
          or similar arrangement of materials, supplies, products or other
          personal property or the furnishing or receipt of services by the
          Company.

               4.   All claims, deposits, causes of action, choses in
          action, rights of recovery, rights of setoff and rights of
          recoupment of the Company.

               5.   All franchises, approvals, Permits, licenses, Orders,
          registrations, certificates, variances and similar rights of the
          Company.

               6.   All other contracts, agreements, instruments,
          guarantees and commitments (including confidentiality and
          noncompetition agreements, mortgages, deeds of trust, indentures,
          loan agreements and credit agreements) to which the Company is a
          party or by which assets are bound.

               7.   The names and annual rates of compensation as of March
          31, 1998 (which rates have remained the same through the date of
          this Agreement) of all employees of the Company.

               8.   All notes or accounts receivable relating to accounts
          with the Company, or advances by the Company, to any Seller,
          officer, director, employee or consultant of the Company, and all
          contracts or agreements for the purchase or lease of materials,
          supplies, products or other personal property or for the
          furnishing or receipt of services which are with any Seller,
          officer, director, employee or consultant of the Company.

               9.   Each item of Intellectual Property owned by the Company
          or which is used by the Company in its business and, in each case
          where the Company is not the owner, the owner of the Intellectual
          Property.

               10.  The name of each bank or other financial institution or
          entity in which the Company has an account or safe deposit box
          (with the identifying account number or symbol) and the names of
          all persons authorized to draw on such account or to have access
          to such safe deposit box.
 

                                  Schedule 3.10(b) - 1





                            REGISTRATION RIGHTS AGREEMENT


               This Registration Rights Agreement (this "Agreement"), dated
          as of July 27, 1998, is made by and between the undersigned
          members (the "Sellers") of DataChoice Network Services, L.L.C., a
          Nevada limited liability company ("DataChoice"), and ICG
          Communications, Inc., a Delaware corporation (the "Company").

                                       RECITALS

               A.   The Sellers and ICG D.C. Holdings, Inc. have entered
          into a Purchase Agreement dated as of June 11, 1998, as amended
          by an Amendment dated July 27, 1998 (as the same may be amended
          from time to time, the "Purchase Agreement"), providing for the
          purchase by the Company of all the Sellers' interests in
          DataChoice.

               B.   Upon consummation of the transactions contemplated by
          the Purchase Agreement, the Sellers will be entitled to receive
          from the Company 145,997 ICG Shares (collectively, the "Shares"),
          in consideration of the purchase price of the interests in
          DataChoice.

               C.   It is a condition to the Closing of the transactions
          contemplated by the Purchase Agreement that the Company and the
          Sellers enter into this Agreement.

                                      AGREEMENT

               NOW, THEREFORE, for good and valuable consideration, the
          receipt, sufficiency and adequacy of which are hereby
          acknowledged, the parties to this Agreement agree as follows:

          1.   Defined Terms.  Capitalized terms used in this Agreement and
               -------------
          not otherwise defined herein  have the meanings assigned to them
          in the Purchase Agreement.

          2.   Registration Rights.
               ------------------- 

               (a)  Registration.  The Company shall be obligated to 
                    ------------
          register under the Securities Act, a number of shares of ICG
          Common Stock sufficient to permit the resale by the Sellers of
          any and all ICG Shares issued pursuant to the Purchase Agreement
          (the "Registrable Shares").  The Company shall use commercially
          reasonable efforts to prepare and file with the Securities and
          Exchange Commission (the "Commission") a registration statement
          under the Securities Act covering the Registrable Shares issued
          at the Closing (the "Registration Statement") and use its best
          efforts to cause the Registration Statement to become effective
          on or before the date that is the earlier of (i) April 1, 1999,
          and (ii) nine months after the Closing Date (or if such date is
          not a Business Day, the next Business Day).   Subject to the
          terms and conditions of this Agreement, the Company agrees to
          maintain the effectiveness of the Registration Statement until
          the close of business on July 27, 1999 (the first anniversary of
          the Closing Date).


          <PAGE>


               (b)  Withdrawal from Registration.  The Sellers may, before
                    ---------------------------- 
          a Registration Statement becomes effective, withdraw their
          Registrable Shares from sale, should the terms of sale not be
          satisfactory to the Sellers; provided however that should the
          Sellers so withdraw, such registration shall be deemed to have
          occurred for the purposes of Section 2(a) hereof.

               (c)  Limitations on Registration Rights.  Notwithstanding 
                    ----------------------------------
          the provisions of Section 2(a)  hereof, the Company shall not be
          required to effect any registration pursuant hereto if the
          Company, in order to comply with such request, would be required
          to (i) undergo a special interim audit or (ii) prepare and file
          with the Commission, sooner than would otherwise be required, pro
          forma or other financial statements relating to any proposed or
          probable transaction.  Notwithstanding the provisions of this
          Section 2, the Company shall not be required to effect any
          registration pursuant to this Section 2 , or to maintain the
          effectiveness of any Registration Statement filed hereunder, if
          the Sellers could sell the number of Registrable Shares then
          issued without registration under the Securities Act (whether
          under Rule 144 promulgated under the Securities Act or any
          successor to such rule or otherwise) and without an adverse
          effect on the market price of the Registrable Shares.  Without
          limiting the generality of the foregoing, the Company shall not
          be required to maintain the effectiveness of any Registration
          Statement filed pursuant to this Agreement after July 27, 1999
          (the first anniversary of the Closing Date).

               (d)  Obligations with Respect to Preparation and Filing of 
                    -----------------------------------------------------
          Registration Statement.  In connection with its obligation 
          ----------------------
          pursuant to this Agreement to effect a registration of
          Registrable Shares, the Company shall, as soon as practicable:

                    (i)  furnish, before filing any Registration Statement,
          a draft of the prospectus to be included therein ("Prospectus") 
          and any amendments or supplements relating to such Registration
          Statement or Prospectus and copies of all other documents
          proposed to be filed, to the Sellers;

                    (ii)      use commercially reasonable efforts to
          prepare and file with the Commission any amendments and
          supplements to the Registration Statement and to the Prospectus
          included therein as may be necessary to keep the Registration
          Statement effective and to comply with the provisions of the
          Securities Act with respect to the disposition of all Registrable
          Shares covered by the Registration Statement for the period
          required to effect the distribution of such Registrable Shares
          but in no event shall the Company be required to do so after the
          earlier to occur of (A) July 27, 1999 (the first anniversary of
          the Closing Date) and (B) the date on which all of the
          Registrable Shares have been sold by Sellers;

                    (iii)     furnish, at the Company's expense, to the
          Sellers such number of copies of the Prospectus, including a
          preliminary Prospectus, in conformity with the requirements of
          the Securities Act and the rules and regulations promulgated
          thereunder, as may reasonably be required in order to facilitate
          the disposition of the Registrable Shares covered by a
          Registration Statement, but only during the period the Company is
          required under the provisions of this Agreement to cause such
          Registration Statement to remain effective;



                                     -2-

          <PAGE>

 
                    (iv) use commercially reasonable efforts to register or
          qualify the Registrable Shares covered by a Registration           
          Statement under the securities or blue sky laws of such
          jurisdictions in the United States as the Sellers reasonably
          request, and do any and all other acts and things which may be
          necessary to enable the Sellers to consummate the disposition of
          such Registrable Shares in such jurisdictions; provided however,
          that the Company shall in no event be required to qualify to do
          business as a foreign corporation or a dealer in any jurisdiction
          where it is not so qualified, to execute or file any general
          consent or become subject to service of process under the laws of
          any jurisdiction, or subject itself to taxation in any
          jurisdiction where it has not been so subject;

                    (v)  use  commercially reasonable efforts to cause the
          Registrable Shares to be registered with or approved by such
          other governmental agencies or authorities as may be necessary by
          virtue of the business and operations of the Company to enable
          the Sellers to consummate the disposition of the Registrable
          Shares;

                    (vi) notify each Seller at any time when a Prospectus
          relating to the Registrable Shares is required to be delivered
          under the Securities Act within the appropriate period mentioned
          in clause (iii) of this Section 2(d) of the happening of any
          event as a result of which the Prospectus included in any such
          Registration Statement, as then in effect, includes an untrue
          statement of a material fact or omits to state a material fact
          required to be stated therein or necessary to make the statements
          therein not misleading in light of the circumstances then
          existing and, at the request of such Seller, prepare and furnish
          to such Seller a reasonable number of copies of a supplement to
          or an amendment of such Prospectus as may be necessary so that,
          as thereafter delivered to the offerees of such Registrable
          Shares, such Prospectus shall not include an untrue statement of
          a material fact or omit to state a material fact required to be
          stated therein or necessary to make the statements therein not
          misleading in light of the circumstances then existing; and

                    (vii)     use commercially reasonable efforts to cause
          the Registrable Shares to be listed on any national securities
          exchange on which any shares of the ICG Common Stock are then
          listed.

               (e)  Blackout Rights.  Notwithstanding any other provision 
                    --------------- 
          of this Agreement to the contrary, if the Company determines, in
          its reasonable business judgment, that the registration and
          offering to be effected pursuant to any Registration Statement
          could interfere with or otherwise adversely affect any financing,
          acquisition, corporate reorganization, sale, merger,
          consolidation or other material transaction or development
          involving the Company or any of its affiliates or require the
          Company to disclose any matter that otherwise would not be
          required to be disclosed at such time, then the Company may, upon
          written notice to Sellers' Agent (i) postpone the filing of a
          Registration Statement for a reasonable period of time, but in no
          event in excess of 60 days after receipt of the initial request
          for registration or (ii) if a Registration Statement has become
          effective, require the Sellers to suspend the distribution of any
          of the Registrable Shares by giving notice to the Sellers.  Any
          such notice need not specify the reasons for such suspension if
          the Company determines, in its reasonable judgment, that doing so


                                     -3-

          <PAGE>

          would interfere with or adversely affect such transaction or
          development or would result in the disclosure of material non-
          public information.  Subject to the following sentence, until the
          Company has determined, in its reasonable judgment, that such
          postponement or suspension is no longer necessary and has given
          notice of that determination to the Sellers, the Company's
          obligations to use commercially reasonable efforts to cause a
          Registration Statement to become or remain effective and the
          Sellers' right to sell Registrable Shares under the Registration
          Statement shall be suspended.  The Company may exercise its right
          to suspend the Seller's registration rights pursuant to this
          subparagraph (e) on four occasions and then for a period not to
          exceed 60 days per occasion, and the period during which the
          Company is required to cause the Registration Statement to remain
          effective shall be extended by a period equal to the period of
          such suspension.

          3.   Information and Compliance with Legal Requirements.  The 
               --------------------------------------------------
          Sellers agree to cooperate fully with the Company in the
          preparation and filing of the Registration Statements pursuant to
          this Agreement and further covenant that all information supplied
          or to be supplied in writing to the Company by the Sellers or any
          of the Sellers' representatives expressly for inclusion in the
          Registration Statements, any Prospectus and any amendment or
          supplement thereto will not contain any untrue statement of a
          material fact or omit to state any material fact required to be
          stated therein or necessary in order to make the statements
          therein, in light of the circumstances under which they were
          made, not misleading.

          4.   Expenses.  The Company shall be responsible for all expenses
               --------
          incurred by the Company in complying with Section 2, including,
          without limitation, all registration and filing fees, fees and
          expenses of complying with securities and blue sky laws, printing
          expenses and fees and expenses of the Company s counsel and
          accountants. The Sellers shall be responsible for all
          underwriting or broker's discounts and commissions and transfer
          taxes, if any, relating to the resale by the Sellers of the
          Registrable Shares, as well as all fees and expenses of counsel
          and of any other advisor to the Sellers.

          5.   Indemnification.
               --------------- 

               (a)  Indemnification by The Company,  The Company agrees to 
                    ------------------------------
          indemnify and hold harmless the Sellers and each Person (if any)
          who controls any Seller within the meaning of either the
          Securities Act or the Exchange Act (collectively, the "Seller
          Indemnified Parties") from and against any losses, claims,
          damages or liabilities (collectively "Losses"), joint or several,
          to which such Seller Indemnified Parties may become subject,
          insofar as such Losses (or actions in respect thereof) are based
          upon any untrue statement or alleged untrue statement of a
          material fact contained in any Registration Statement or any
          Prospectus, or any omission or alleged omission to state therein
          a material fact required to be stated therein or necessary to
          make the statements therein, in light of the circumstances under
          which they were made, not misleading; and, subject to Section
          5(c), the Company shall reimburse such Seller Indemnified Parties
          for any legal or other expenses reasonably incurred by them in
          connection with investigating or defending any such Losses;
          provided, however, that the Company shall not indemnify or hold
          --------
          harmless any Seller Indemnified Party from or against any such


                                     -4-

          <PAGE>


          Losses (i) that arise out of or are based upon any violation of
          any federal or state securities laws, rules or regulations
          committed by any of the Seller Indemnified Parties (or any Person
          who controls any of them or any agent, broker-dealer or
          underwriter engaged by them) or in the case of a non-underwritten
          offering, any failure by such Sellers to give any purchaser of
          Registrable Shares, at or prior to the written confirmation of
          such sale, a copy of the most recent Prospectus or (ii) if the
          untrue statement, omission or allegation thereof upon which such
          Losses or expenses are based (x) was made in reliance upon and in
          conformity with the information provided by or on behalf of any
          Seller Indemnified Party specifically for use or inclusion in any
          Registration Statement or any Prospectus, or (y) was made in any
          Prospectus used after such time as the Company advised such 
          Seller that the filing of a post-effective amendment or
          supplement thereto was required, except the Prospectus as so
          amended or supplemented, or (z) was made in any Prospectus used
          after such time as the obligation of the Company hereunder to
          keep such Registration Statement effective and current has
          expired or been suspended hereunder.

               (b)  Indemnification by Sellers.  The Sellers, severally and
                    --------------------------
          not jointly, agree to indemnify and hold harmless the Company,
          its directors and officers and each person, if any, who controls
          the Company within the meaning of either the Securities Act or
          the Exchange Act (the "Company Indemnified Parties"), from and
          against any Losses, joint or several, to which the  Company
          Indemnified Parties may become subject, insofar as such Losses
          (or actions in respect thereof) arise out of or are based upon
          (i) any untrue statement or alleged untrue statement of a
          material fact contained in any Registration Statement or any
          Prospectus, or any omission or alleged omission to state therein
          a material fact required to be stated therein or necessary to
          make the statements therein, in light of the circumstances under
          which they were made, not misleading, if the statement or omission 
          was made in reliance upon and in conformity with the information 
          provided by or on behalf of a Seller or any Person who controls such
          Seller specifically for use or inclusion in the Registration 
          Statements or any Prospectus, (ii) the use of any Prospectus after 
          such time as the Company has advised a Seller that the filing of a 
          post-effective amendment or supplement thereto is required, except 
          the Prospectus as so amended or supplemented, (iii) the use of any 
          Prospectus after such time as the obligation of the Company hereunder
          to keep such Registration Statement effective and current has expired
          or been suspended hereunder or (iv) any violation by a Seller or
          any Person who controls such Seller within the meaning of either 
          the Securities Act or the Exchange Act (or any agent, broker-dealer 
          or underwriter engaged by such  Seller or any such controlling person)
          of any federal or state securities law or rule or regulation 
          thereunder or any failure by such Seller to give any purchaser of
          Registrable Shares at or prior to the written confirmation of such 
          sale a copy of the most recent Prospectus; and, subject to Section 
          5(c), such Seller shall reimburse such the Company Indemnified
          Parties for any legal or other expenses reasonably incurred by them in
          connection with investigating or defending any such Losses.  
          For purposes of this Agreement, including but not limited to clause 
          (i) of the preceding sentence and clause (ii) of the proviso set 
          forth in Section 5(a), any information concerning any Seller 
          Indemnified Party or plan of distribution included in any 
          Registration Statement or Prospectus that is provided to a Seller for
          his review within a reasonable period before filing or use thereof 
          and as to which such Seller has not promptly provided written notice 
          of objection or correction to the Company shall be deemed to have 
          been provided by such Seller specifically for use in such 
          Registration Statement or Prospectus.



                                     -5-

          <PAGE>

               (c)     Indemnification Procedure.  Each party entitled to 
                       -------------------------
          indemnification under this Section 5 (the "Indemnified Party") shall
          give notice to the party required to provide indemnification (the
          "Indemnifying Party") promptly after such Indemnified Party has 
          actual knowledge of any claim as to which indemnity may be sought, and
          the Indemnifying Party may participate at its own expense in the
          defense, or if it so elects, to assume the defense of any such claim 
          and any action or proceeding resulting therefrom, including the 
          employment of counsel and the payment of all expenses.  The failure of
          any Indemnified Party to give notice as provided herein shall not 
          relieve the Indemnifying Party from its obligations to indemnify
          such Indemnified Party, except to the extent the Indemnified Party's 
          failure so to notify actually prejudices the Indemnifying Party's
          ability to defend against such claim, action or proceeding.  If the 
          Indemnifying Party elects to assume the defense in any action or 
          proceeding, the Indemnified Party shall have the right to employ 
          separate counsel in any such action or proceeding and to participate
          in the defense thereof, but the fees and expenses of such separate 
          counsel shall be such Indemnified Party's expense unless (i) the
          Indemnifying Party has agreed to pay such fees and expenses or (ii) 
          the named parties to any such action or proceeding (including any 
          impleaded parties) include an Indemnified Party and the Indemnifying 
          Party, and such Indemnified Party shall have been advised by counsel
          that there may be a conflict of interest between such Indemnified 
          Party and the Indemnifying Party in the conduct of the defense of such
          action (in which case, if such Indemnified Party notifies the 
          Indemnifying Party in writing that it elects to employ separate
          counsel at the expense of the Indemnifying Party, the Indemnifying 
          Party shall not assume the defense of such action or proceeding on 
          such Indemnified Party's behalf, it being understood, however, that 
          the Indemnifying Party shall not, in connection with any one such 
          action or proceeding or separate but substantially similar or related
          actions or proceedings arising out of the same general allegations or
          circumstances, be liable for the reasonable fees and expenses of more
          than one separate firm of attorneys at any time for all Indemnified
          Parties, which firm will be designated in writing by the Seller or 
          the Company, as the case may be).  No Indemnifying Party, in the 
          defense of any such claim or litigation, shall, except with the 
          consent of the Indemnified Party, consent to entry of any judgment or
          enter into any settlement which does not include as an unconditional 
          term thereof the giving by the claimant or plaintiff to such 
          Indemnified Party of a release from all liability with respect to such
          claim or litigation.  The Indemnifying Party shall not be liable for
          any settlement of any such action or proceeding effected without its
          written consent, but if settled with its written consent, or if there
          be a final judgment for the plaintiff in any such action or 
          proceeding, the Indemnifying Party shall indemnify and hold harmless 
          the Indemnified Party from and against any loss or liability by reason
          of such settlement or judgment.

               (d)     Allocation and Contribution.  If the indemnification
                       ---------------------------    
          provided for under this     Section 5 is unavailable to or 
          insufficient to hold the Indemnified Party harmless in respect of any
          Losses referred to in Section 5(a) or (b) above for any reason other 
          than as specified therein, then the Indemnifying Party shall 
          contribute to the amount paid or payable by such Indemnified Party as
          a result of such Losses (i) in such proportion as is appropriate to 
          reflect the relative benefits received by the Indemnifying Party on
          the one hand and such Indemnified Party on the other from the 
          subject offering or distribution or (ii) if the allocation provided by
          clause (i) above is not permitted by applicable law, in such 
          proportion as is appropriate to reflect not only the relative benefits


                                     -6-

          <PAGE>

          referred to in clause (i) above but also the relative fault of the 
          Indemnifying Party on the one hand and such Indemnified Party on the 
          other in connection with the statements or omissions which resulted 
          in such Losses as well as any other relevant equitable considerations.
          The relative benefits received by the Indemnifying Party on the one 
          hand and the Indemnified Party on the other hand shall be deemed to
          be in the same proportion as the net proceeds of the offering or 
          other distribution (after deducting expenses) received by the 
          Indemnifying Party bears to the net proceeds of the offering or other
          distribution (after deducting expenses) received by the Indemnified 
          Party. The relative fault shall be determined by reference to, among
          other things, whether the untrue or alleged untrue statement of a 
          material fact or the omission or alleged omission to state a 
          material fact relates to information supplied by (or omitted to be
          supplied by) the Company or the  Sellers, the parties' relative 
          intent, knowledge, access to information and opportunity to correct or
          prevent such statement or omission, the relative benefits received by 
          each party from the sale of the Registrable Shares and any other 
          equitable considerations appropriate under the circumstances.  The 
          amount paid or payable by an Indemnified Party as a result of the 
          Losses referred to above in this Section 5(d) shall be deemed to 
          include any legal or other expenses reasonably incurred by such 
          Indemnified Party in connection with investigating or defending any 
          such action or claim.  No person who was guilty of fraudulent 
          misrepresentation (within the meaning of Section 11(f) of the 
          Securities Act) shall be entitled to contribution from any person who
          was not guilty of such fraudulent misrepresentation.

          6.   Further Assurances.  After the Closing Date,  the Sellers shall 
               ------------------
         take such other actions and enter into such other agreements as may be
         deemed reasonably necessary or advisable by the Company in connection 
         with any resale by the Sellers of the Shares.

          7.   Miscellaneous.
               -------------

               (a)     Entire Agreement.  This Agreement constitutes the entire 
                       ----------------
          agreement between the parties with respect to the subject matter 
          hereof and supersedes all prior written and oral, and all 
          contemporaneous oral, agreements and understandings with respect to 
          the subject matter of this Agreement.

               (b)     Notices.  All notices and other communications hereunder 
                       -------
          shall be in writing and shall be deemed to have been duly given when 
          delivered in person, by telecopy, or by registered or certified mail 
          (postage prepaid, return receipt requested) to the respective parties
          as follows:

          If to the Company:     ICG Communications, Inc.
                                 9605 East Maroon Circle
                                 Englewood, Colorado  80112
                                 Telecopy: (303) 575-6278
                                 Attention: H. Don Teague, Esq.
                                            Executive Vice President, 
                                            Secretary and General Counsel



                                     -7-

          <PAGE>

          With a copy to:        Sherman & Howard L.L.C.
                                 633 Seventeenth Street, Suite 3000
                                 Denver, Colorado  80202
                                 Telecopy:        (303) 298-0940
                                 Attention:       Robert Mintz, Esq.

          If to the Sellers:     G. Kelley Allen
                                 5485 South Hoyt Street
                                 Littleton, Colorado 80123
                                 Telecopy:  (303) 973-7316

                                 with a copy to:

                                 Olona & Associates, P.C.
                                 Attention:  Richard G. Olona, Esq.
                                 621 Seventeenth Street, Suite 2540
                                 Denver, Colorado 80293
                                 Telecopy:  (303) 297-2927

          or to such other address as the party to whom notice is given may have
          previously furnished to the others in writing in the manner set forth 
          above.  Any notice or communication delivered in person shall be 
          deemed effective on delivery.  Any notice or communication sent by 
          telecopy shall be deemed effective when confirmed.  Any notice or 
          communication sent by registered or certified mail, return receipt 
          requested, shall be deemed effective when received, as evidenced by
          the return receipt.

               (c)     GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY 
                       -------------
          AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE 
          REGARDLESS OF THE LAWS THAT MIGHT OTHERWISE GOVERN UNDER PRINCIPLES OF
          CONFLICTS OF LAWS APPLICABLE THERETO.

               (d)     Rules of Construction.  The descriptive headings in this 
                       ---------------------
          Agreement are inserted for convenience of reference only and are not 
          intended to be part of or to affect the meaning or interpretation of 
          this Agreement.  Words used in this Agreement, regardless of the 
          gender and number specifically used, shall be deemed and construed to 
          include any other gender, masculine, feminine, or neuter, and any 
          other number, singular or plural, as the context requires.  As used in
          this Agreement, the word "including" is used in an illustrative sense 
          rather than a limiting sense, and the word "or" is not exclusive.

               (e)     Parties in Interest.  This Agreement shall be binding 
                       -------------------
          upon and inure solely to the benefit of the parties to this Agreement 
          and their legal successors-in-interest, and nothing in this 
          Agreement, express or implied, is intended to confer upon any other 
          person any rights or remedies of any nature whatsoever under or by 
          reason of this Agreement.



                                     -8-

          <PAGE>

               (f)     Counterparts.  This Agreement may be executed in
                       ------------
          counterparts, each of which shall be deemed to be an original, but all
          of which shall constitute one and the same agreement.  This Agreement 
          may be delivered by facsimile and facsimile signatures will be treated
          as original signatures for all applicable purposes.

               (g)     Assignment.  This Agreement may not be assigned by either
                       ----------         
          party to this Agreement.

                (h)     Amendment.  This Agreement may not be amended except by 
                        ---------
          an instrument in writing signed on behalf of both the parties.

               (i)     Extension; Waiver.  Either party to this Agreement may 
                       ----------------- 
          (a) agree to extend the time for the performance of any of the 
          obligations or other acts of the other party to this Agreement, (b) 
          waive any inaccuracies in the representations and warranties of the 
          other party contained herein or in any document, certificate, or 
          writing delivered pursuant to this Agreement by the other party, or 
          (c) waive compliance by the other party with any of the agreements or
          conditions contained herein or any breach thereof.  Any agreement on 
          the part of either party to any such extension or waiver shall be 
          valid only if set forth in an instrument in writing signed on behalf 
          of such party.

               (j)     Legal Fees; Costs.  If either party to this Agreement 
                       -----------------
          institutes any action or proceeding, whether before a court or 
          arbitrator, to enforce any provision of this Agreement, the prevailing
          party therein shall be entitled to receive from the losing party 
          reasonable attorneys' fees and costs incurred in such action or 
          proceeding, whether or not such action or proceeding is prosecuted to
          judgment.

               (k)     Arbitration.  Any disputes arising under or in connection
                       -----------
          with this Agreement, including, without limitation, those involving 
          claims for specific performance or other equitable relief, will be 
          submitted to binding arbitration under the Commercial Arbitration 
          Rules of the American Arbitration Association under the authority of 
          federal and state arbitration statutes, and will not be the subject 
          of litigation in any forum.  EACH PARTY, BY SIGNING THIS AGREEMENT, 
          VOLUNTARILY, KNOWINGLY AND INTELLIGENTLY WAIVES ANY RIGHTS SUCH 
          PARTY MAY OTHERWISE HAVE TO SEEK REMEDIES IN COURT OR OTHER FORUMS, 
          INCLUDING THE RIGHT TO JURY TRIAL. The arbitration will be conducted
          only in Denver, Colorado, or another location mutually agreed by the 
          Sellers and the Company, before a single arbitrator selected by the 
          parties or, if they are unable to agree on an arbitrator, before a 
          panel of three arbitrators, one selected by Sellers, one selected
          by the Company and the third selected by the other two arbitrators.
          The arbitrators will have full authority to order specific
          performance and award damages and other relief available under this 
          Agreement or applicable law, but will have no authority to add to, 
          detract from, change or amend the terms of this Agreement or existing
          law.  All arbitration proceedings, including settlements and awards, 
          will be confidential.  The decision of the arbitrators will be final
          and binding, and judgment on the award by the arbitrators may be
          entered in any court of competent jurisdiction.  THIS SUBMISSION AND
          AGREEMENT TO ARBITRATE WILL BE

                                      -9-
          <PAGE>

          SPECIFICALLY ENFORCEABLE.  The arbitrator will have no power to award 
          punitive or exemplary damages, to ignore or vary the terms of this 
          Agreement, and will be bound to apply controlling law.  The party who
          prevails on entry of the award of judgment will be entitled to his or
          its costs and expenses, including reasonable attorney's fees incurred
          in connection with the arbitration.  A judgment upon the award may be
          entered in any court having jurisdiction.

               IN WITNESS WHEREOF, the parties have executed and delivered this 
          Agreement as of the date first written above.


                                    ICG COMMUNICATIONS, INC.


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


                                    SELLERS:

                                    G. Kelley Allen Trust

                                    By: --------------------------------------
                                        G. Kelley Allen, Trustee


                                    GORDON B. KOCH DAUGHTERS TRUST


                                    By: --------------------------------------
                                        Carole K. Allen, Trustee
                                        By:  G. Kelley Allen, 
                                            as attorney in fact


                                        --------------------------------------
                                        Michele R.K. Fought


                                    T&D CONSULTING, INC.

                                    By: ----------------------------------------
                                        David Gandini


                                     -10-



                                     
                                   ESCROW AGREEMENT


               THIS  ESCROW  AGREEMENT  (this  "Agreement"),  is  made  and
          entered on  the  27th  day  of  July,  1998,  by  and  among  ICG
          Communications,  Inc.,  a  Colorado  corporation  ("Buyer"),  the
          persons  listed  on  Exhibit  A  (collectively,  "Sellers"),  and
                               -------
          Norwest Bank Colorado, N.A. ("Escrow Agent"), together, the "Parties."


                                       RECITALS
                                       --------

               A.   Buyer and  Sellers have  executed a  Purchase Agreement
          dated  as of June 11, 1998 (the "Purchase Agreement") pursuant to
          which  Buyer has  agreed  to purchase  all  of the  interests  in
          DataChoice Network Services, L.L.C.,  a Nevada limited  liability
          company (the "Company"),  held by  Sellers.  Article  VII of  the
          Purchase Agreement provides that on or prior to the Closing Date,
          each of the  Sellers, as a group, and  Buyer shall have delivered
          to the other this Agreement, duly and properly executed.

               B.   Section 2.2 of the  Purchase Agreement provides that at
          the Closing (as defined in  the Purchase Agreement), Buyer  shall
          deposit  with the Escrow Agent  16,441 ICG Shares  (as defined in
          the Purchase  Agreement), representing a portion  of the Purchase
          Price, such amount so paid to be held pursuant to this Agreement.

               NOW,  THEREFORE, in  consideration of  the premises  and the
          mutual  covenants  herein  contained,  and  for  other  good  and
          valuable consideration,  the receipt, adequacy and sufficiency of
          which  is  hereby  acknowledged,  the  Parties  hereby  agree  as
          follows:

          1.   Escrow.
               ------

               a.   Upon delivery  of this  Agreement properly executed  by
          the Parties,  Buyer  shall  tender  16,441  in  ICG  Shares  (the
          "Escrowed Amount") to the Escrow Agent, to  be held by the Escrow
          Agent  in trust upon the  express terms and  conditions, with the
          powers and limitations, and for  the exclusive purpose set  forth
          herein.  The ICG Shares shall be issued  and held in the names of
          Sellers,  in  proportion  to  their  ownership  of  the  Company,
          accompanied with stock powers duly  executed in blank by Sellers.
          Such Escrowed Amount and all proceeds of such Escrowed Amount now
          or hereafter  subject to this Agreement  are hereinafter referred
          to as  the "Escrow Assets."   The Parties  agree that the  Escrow
          Assets are the  sole property of Sellers held by the Escrow Agent
          for the sole purpose  of securing the indemnification obligations
          of  Sellers pursuant to  Article VIII of  the Purchase Agreement.
          The  Sellers shall have the right to  vote the ICG Shares held in
          the  Escrow Account,  and all  dividends paid  on the  ICG Shares
          shall  be held in the  Escrow Account pursuant  to this Agreement
          for the benefit of Sellers.



          <PAGE>

               b.   The Escrow  Agent shall  hold and safeguard  the Escrow
          Assets  separate and apart from  the assets of  the Escrow Agent.
          The Escrow Agent represents  that the Escrow Assets shall  not at
          any time, including in the  event of the bankruptcy,  dissolution
          or insolvency of the  Escrow Agent or otherwise, be or  be deemed
          to be assets of the Escrow Agent.

               c.   Sellers, as a  group, and  Buyer shall  each execute  a
          certificate of incumbency substantially in the form of Exhibit B 
                                                                 ---------
          for   the   purpose  of   establishing   the   identity  of   the
          representative(s) of each party entitled to issue instructions or
          directions  to the Escrow Agent pursuant to Paragraph 2 herein on
          behalf of such party  (each such person being referred  to herein
          as  "Authorized   Representative").    Sellers   shall  designate
          Sellers' Agent as their Authorized Representative.

               d.   Each Seller and Buyer shall furnish to the Escrow Agent
          a Form W-8 or Form W-9, as applicable.

          2.   Claims.  If, prior  to July 27, 1999 (the  first anniversary
               ------
          of the  Closing Date  (the  "Termination Date")),  the Escrow  Agent
          receives from an  Authorized Representative of Buyer  one or more
          notices  addressed to Escrow Agent and to Sellers' Agent (each, a
          "Demand  Notice")  requesting payment  to  Buyer  of a  specified
          amount  of the Escrow Assets ("Claimed Amount"), the Escrow Agent
          shall, within three Business Days (as such term is defined in the
          Purchase Agreement) of receipt of such Demand Notice, send a copy
          of  the Demand Notice to Sellers' Agent via courier or facsimile,
          with  a cover letter indicating  the date such  Demand Notice was
          received by the Escrow Agent.   If, within five Business Days  of
          the date  the Escrow  Agent received  such Demand  Notice ("Reply
          Period"),  the  Escrow Agent  receives  written  notice from  the
          Authorized Representative of  Sellers ("Reply Notice") requesting
          the Escrow  Agent to continue  to hold  all or a  portion of  the
          Claimed  Amount  ("Disputed  Amount"),  the  Escrow  Agent  shall
          continue  to hold  the  Disputed Amount  until  the Escrow  Agent
          receives  (1)  a  written   agreement  signed  by  an  Authorized
          Representative of  both Sellers  and  Buyer to  pay the  Disputed
          Amount,  or a  portion  thereof,  as  directed  in  such  written
          agreement;  or  (2)  until such  time  as  the  Escrow Agent  has
          received an order of a court  of competent jurisdiction directing
          the Escrow Agent to pay such Disputed Amount, or portion thereof,
          according to  such order.  If the Escrow Agent does not receive a
          Reply  Notice  within the  Reply Period  or  if the  Escrow Agent
          receives a Reply Notice  requesting that the Escrow Agent  hold a
          Disputed Amount which is less than all of the Claimed Amount, the
          Escrow Agent shall pay  to Buyer the Claimed Amount  specified in
          such Demand  Notice less  any Disputed Amount  ("Agreed Amount"),
          such payment to be made as follows:   within two Business Days of
          expiration  of the  Reply  Period or  the  receipt of  the  Reply
          Notice, whichever is applicable,  the Escrow Agent shall (a) send
          to the transfer agent  for the ICG Shares (the  "Transfer Agent")
          the  certificates representing the ICG  Shares held by the Escrow
          Agent, and (b) request the Transfer Agent to cancel the number of
          ICG Shares  equal to the Agreed  Amount and issue to  Sellers and
          deliver to the Escrow Agent certificates representing a number of
          ICG  Shares equal  to the  difference between  the number  of ICG
          Shares delivered  to the Escrow  Agent pursuant to  this sentence
          and the number of ICG Shares representing the Agreed Amount.  The
          calculation  of the number of ICG  Shares representing the Agreed


                                     -2-

          <PAGE>

          Amount to  be cancelled in favor  of Buyer and the  number of ICG
          Shares  to be  reissued to  Sellers and  delivered to  the Escrow
          Agent  pursuant to  this  Section 2  shall  be made  pursuant  to
          Section 4.

          3.   Payment of Escrow Assets Upon Termination.
               -----------------------------------------

               a.   The Escrow  Agent shall  pay to Sellers,  in accordance
          with  Paragraph  2,  within   two  Business  Days  following  the
          Termination Date the  Excess Amount (as hereinafter defined).  As
          used  in this Agreement, "Excess Amount" shall mean the amount by
          which  any  Escrowed  Amount held  by  the  Escrow  Agent on  the
          Termination Date exceeds the Disputed Amount, if any, taking into
          account all Demand Notices issued during the Escrow Period.

               b.   Following the Termination Date,  as claims for Disputed
          Amounts are fully and finally resolved or  at any time any Excess
          Amount exists, the  Escrow Agent shall release the  Excess Amount
          to Sellers in accordance with Paragraph 2.

               c.   Notwithstanding  anything  to  the  contrary   in  this
          Agreement, the Escrow  Agent shall promptly  disburse all or  any
          part of the  Escrow Assets as agreed in writing  and signed by an
          Authorized Representative  of Buyer  and Sellers or  upon receipt
          of, and in accordance with, an order or decree or  final and non-
          appealable judgment of a court of competent jurisdiction.

          4.   Calculation and Payment of  Amounts Payable by Escrow Agent.
               ------------------------------------------------------------
          For purposes of calculating the number of ICG Shares representing
          the Agreed Amount, the  Disputed Amount or the Excess  Amount, as
          applicable under Paragraphs  2 and 3, the per share  value of the
          ICG   Shares,   calculated  as   of   any   applicable  date   of
          determination,  shall  be  the  average of  the  volume  weighted
          average  price   of   the  shares   of   common  stock   of   ICG
          Communications, Inc. on  the five trading days ending two trading
          days prior to the date that  the Escrow Agent makes a payment (or
          is deemed  to make a  payment) of  any amount out  of the  Escrow
          Account on  account of any indemnification  claim or attributable
          to any Excess Amount, as the case may be.  Buyer and Sellers will
          cooperate in good  faith to  determine the number  of ICG  Shares
          representing  the  Agreed Amount,  the  Disputed  Amount and  the
          Excess  Amount,  as   applicable,  and   shall  execute   written
          instructions to the  Transfer Agent with respect to  the issuance
          of  certificates representing ICG Shares  to be canceled in favor
          of  Buyer, or  delivered  to  Sellers  or  the  Escrow  Agent  in
          accordance with Paragraphs 2 and 3.

          5.   Further Provisions Relating to Escrow.  Notwithstanding any 
               -------------------------------------
          provision  contained herein  to the  contrary, the  Escrow Agent,
          including  its officers, directors,  employees and agents, agrees
          to the following:

               a.   The Escrow  Agent shall  not be  liable for  any action
          taken  or omitted under this  Agreement so long  as it shall have
          acted in good faith and without negligence or willful  misconduct
          on its  part.  The Escrow  Agent shall have no  responsibility to
          inquire  into  or  determine  the  genuineness,  authenticity  or
          sufficiency  of  any securities,  checks  or  other documents  or
          instruments  submitted  to  it  in  connection  with  its  duties
          hereunder;  provided,  however,  that  nothing  herein  shall  be
          construed  to  relieve the  Escrow  Agent of  its  obligations to


                                     -3-

          <PAGE>


          exercise  such  care under  the  circumstances  as comports  with
          reasonable  commercial practices  in its  examination  of written
          communications and instruments  furnished hereunder, except  with
          respect  to  verifying  the  genuineness  of  signatures  and  in
          accordance with Paragraph 6.b. below.

               b.   The  Escrow  Agent  shall   be  entitled  to  deem  the
          signatures  on  any  documents  or instruments  submitted  to  it
          hereunder as being those of persons purported to be authorized to
          sign  such documents  or  instruments on  behalf  of the  Parties
          hereto and shall be  entitled to rely upon the genuineness of the
          signatures  of  such  signatories  without  inquiry  and  without
          requiring substantiating evidence of any kind.

               c.   The  Escrow  Agent  shall  have  no  responsibility  or
          liability  for  any  diminution  in  value  of  any  assets  held
          hereunder.

               d.   The Escrow Agent shall  be entitled to compensation for
          its services hereunder in accordance with Exhibit C, which is 
                                                    ---------
          attached hereto and made a part hereof, to be paid by Buyer;

               e.   The Escrow Agent shall be under no obligation to invest
          the Escrowed  Funds until it has  received a Form W-9  or W-8, as
          applicable, from  Buyer and  each of the  Sellers, regardless  of
          whether  any  party  is  exempt  from  reporting  or  withholding
          requirements under the Internal Revenue Code of 1986, as amended.

               f.   The Escrow  Agent shall be, and hereby  is, jointly and
          severally  indemnified and  saved harmless  by Buyer  and Sellers
          from all losses, costs and expenses, including reasonable outside
          counsel  fees, which  may be incurred  by it  as a  result of its
          acceptance  of the Escrow Assets or  arising from the performance
          of  its duties hereunder, unless the Escrow Agent shall have been
          adjudged  to have acted in  bad faith or  to have been negligent.
          Such indemnification shall survive  the resignation or removal of
          the Escrow  Agent  or the  termination of  this Agreement,  until
          extinguished by any applicable statute of limitations;

               g.   In the event any dispute  shall arise between Buyer and
          Sellers with respect to the disposition or disbursement of any of
          the assets held hereunder, the Escrow Agent shall be permitted to
          institute  an arbitration  proceeding under  Paragraph 17  and to
          interplead all of the assets held hereunder into such arbitration
          proceeding and  thereafter shall be  fully relieved from  any and
          all  liability or  obligation with  respect to  such interpleaded
          assets.  Buyer and Sellers further agree to pursue any redress or
          recourse in  connection with such  a dispute, without  making the
          Escrow Agent a party to same.

               h.   The Escrow  Agent shall only  have those duties  as are
          specifically  provided  herein,  which  shall  be  deemed  purely
          ministerial in nature,  and shall under no circumstance be deemed
          a fiduciary for any of Buyer  or Sellers.  The Escrow Agent shall
          not  be responsible for the performance by Buyer or Sellers under
          any  other agreement,  instrument  or document  between Buyer  or
          Sellers, in  connection herewith, including,  without limitation,
          the Purchase  Agreement.  This  Agreement sets forth  all matters
          pertinent to the escrow contemplated hereunder, and no additional


                                     -4-

          <PAGE>


          obligations  of the Escrow Agent shall be inferred from the terms
          of this  Agreement or any other Agreement.  IN NO EVENT SHALL THE
          ESCROW  AGENT BE  LIABLE, DIRECTLY  OR INDIRECTLY,  FOR  ANY: (i)
          DAMAGES  OR  EXPENSES  ARISING   OUT  OF  THE  SERVICES  PROVIDED
          HEREUNDER,  OTHER  THAN  DAMAGES  WHICH RESULT  FROM  THE  ESCROW
          AGENT'S  FAILURE  TO  ACT   IN  ACCORDANCE  WITH  THE  REASONABLE
          COMMERCIAL STANDARDS  OF THE  BANKING BUSINESS IN  FULFILLING ITS
          OBLIGATIONS HEREUNDER OR ITS BREACH OF ITS OBLIGATIONS HEREUNDER;
          OR  (ii)  SPECIAL OR  CONSEQUENTIAL DAMAGES,  EVEN IF  THE ESCROW
          AGENT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

               i.   The  Escrow  Agent shall  have  the right  at  its sole
          expense, but not the  obligation, to consult with counsel  of its
          choice, and the Escrow Agent shall not be liable for action taken
          by it or omitted to be taken in good faith,  either in accordance
          with the advice of such counsel or in accordance with any opinion
          of  counsel to either Buyer or Sellers addressed and delivered to
          the Escrow Agent.

               j.   The Escrow Agent shall have the right to perform any of
          its duties hereunder though agents, custodians or nominees.

               k.   The Escrow Agent shall not be required by any provision
          of  this  Agreement to  expend  or  risk  its own  funds  in  the
          performance of its duties if it shall have reasonable grounds for
          believing that repayment of such  funds is not reasonably assured
          to it.

          Any  banking association  or  corporation into  which the  Escrow
          Agent  (or substantially all of  its corporate trust business) is
          merged  or   converted  or  with   which  the  Escrow   Agent  is
          consolidated,  or  any  corporation  resulting  from  any merger,
          conversion  or consolidation to which the Escrow Agent shall be a
          party,  shall   succeed  to   all  the  Escrow   Agent's  rights,
          obligations  and  immunities hereunder  without the  execution or
          filing of  any paper  or any further  act on  the part of  any of
          Buyer    or   Sellers,   anything    herein   to   the   contrary
          notwithstanding.

          6.   Resignation or  Removal of Escrow  Agent.  The  Escrow Agent
               ----------------------------------------
          may resign as such  following the  giving of 30  days' prior  written
          notice  to the other Parties hereto.  Similarly, the Escrow Agent
          may be removed and replaced by the other Parties hereto following
          the giving of  30 days' prior written notice  to the Escrow Agent
          by an Authorized Representative of each of Buyer and Sellers.  In
          either event, the duties  of the Escrow Agent shall  terminate 30
          days after receipt of such notice  (or as of such earlier date as
          may  be mutually agreeable), at which time the Escrow Agent shall
          deliver  the  balance  of  the  moneys  or  assets  then  in  its
          possession to a successor  escrow agent as shall be  appointed by
          Buyer and Sellers  in a  written notice signed  by an  Authorized
          Agent of both Buyer and Sellers and filed with the Escrow Agent.

               If  Buyer and Sellers are  unable to agree  upon a successor
          escrow agent or fail to appoint a successor escrow agent prior to
          the  expiration of  30 days  following receipt  of the  notice of
          resignation  or removal, any  of the Parties  hereto may petition
          any court  of competent  jurisdiction  for the  appointment of  a


                                     -5-

          <PAGE>


          successor escrow agent or  for other appropriate relief, and  any
          such  resulting appointment  shall  be binding  upon all  Parties
          hereto.

          7.   Termination of Escrow Agent's Liability.  The Escrow Agent's
               ---------------------------------------
          responsibilities  and liabilities hereunder  shall terminate upon
          payment  by  the  Escrow  Agent  of  all  the  Escrow  Assets  in
          accordance with the provisions of this Agreement.

          8.   No  Third-Party  Beneficiaries.    This  Agreement will  not
               ------------------------------
          confer any rights or remedies upon any person other than the Parties 
          and their respective successors and permitted assigns.

          9.   Entire  Agreement.    This   Agreement,  together  with  its
               -----------------
          Exhibits, constitutes the entire agreement among the Parties and 
          supersedes any prior  understandings, agreements  or  representations
          by  or among the Parties, written or oral, to the  extent they relate 
          in any way to the subject matter hereof.

          10.  Succession and Assignment.  This Agreement will be binding 
               -------------------------
          upon and inure to the benefit of the Parties and their respective
          heirs,   executors,  administrators,   personal  representatives,
          successors and assigns.

          11.  Counterparts.  This Agreement may be executed in  any number
          of   ------------
          counterparts, each of which  shall be deemed an original  and all
          of  which together  shall  be  deemed  to be  one  and  the  same
          instrument.  The execution of a counterpart of the signature page
          to this Agreement will  be deemed the execution of  a counterpart
          of this Agreement.  The delivery of this Agreement may be made by
          facsimile, and facsimile signatures  shall be treated as original
          signatures for all applicable purposes.

          12.  Headings, Terms.  The section headings contained in this 
               ---------------
          Agreement are inserted  for convenience only and  will not affect
          in any  way  the meaning  or  interpretation of  this  Agreement.
          Unless  otherwise  defined in  this  Agreement,  terms used  with
          initial capital letters will  have the meanings ascribed to  them
          in the Purchase Agreement, applicable to both singular and plural
          forms, for all purposes of this Agreement.  All pronouns (and any
          variation)  will be deemed to refer to the masculine, feminine or
          neuter, as the identity of the person may require.   The singular
          or plural includes the other, as the context requires or permits.
          The word "include" (and any variation) is used in an illustrative
          sense  rather than  a limiting  sense.   The word  "day"  means a
          calendar day.

          13.  Notices.  All notices, requests, demands, claims and other 
               -------
          communications  hereunder  will  be  in  writing.    Any  notice,
          request, demand, claim, payment or other  communication hereunder
          shall  be  deemed duly  given  if  it is  sent  by  registered or
          certified mail, return receipt  requested, postage prepaid, or by
          courier,  telecopy or  facsimile, and  addressed to  the intended
          recipient as set forth below:



                                     -6-

          <PAGE>


          If to Sellers:                     Copy to:

          Addressed to Sellers' Agent at:    Olona & Associates, P.C.
          5485 South Hoyt Street             621 Seventeenth Street, Suite 2540
          Littleton, Colorado 80123          Denver, Colorado 80202
          Telecopy:  (303) 973-7316          Telecopy:  (303) 297-2927
          Attention:  G. Kelley Allen        Attention: Richard G. Olona, Esq.

          If to Buyer:                       Copy to:

          ICG Communications, Inc.           Sherman & Howard L.L.C.
          161 Inverness Drive West           633 Seventeenth Street, Suite 3000
          Englewood, Colorado 80112          Denver, Colorado 80202
          Attn: H. Don Teague, Esq.          Attention: Robert Mintz, Esq.
          Executive Vice President            
             General Counsel and Secretary      
          Telecopy: (303) 414-8884           Telecopy:  (303) 298-0940


          If to Escrow Agent:                Copy to:

          Norwest Bank Colorado, N.A.
          1740 Broadway
          Denver, Colorado 80274
          Attn: Corporate Trust and Escrow
                   Services Department

          Notices will be deemed given seven days after mailing if sent  by
          certified mail,  when  delivered if  sent  by courier,  and  upon
          receipt  of confirmation by person or machine if sent by telecopy
          or facsimile transmission.   Any party may change the  address to
          which notices, requests, demands, claims and other communications
          hereunder  are to be delivered by giving the other Parties notice
          in the manner herein set forth.

          14.  Governing Law.  This Agreement will be governed by and
               -------------
          construed  in accordance with the  domestic laws of  the State of
          Colorado without giving effect  to any choice or conflict  of law
          provision or  rule (whether of the State of Colorado or any other
          jurisdiction) that would cause the application of the laws of any
          jurisdiction other than the State of Colorado. 

          15.  Amendments and  Waivers.  No  amendment of any  provision of
               -----------------------    
          this Agreement shall be valid unless the same is in writing and 
          signed by  the  Parties. No  waiver  by any  party  of  any  default,
          misrepresentation or  breach of warranty  or covenant  hereunder,
          whether intentional or not, will be deemed to extend to any prior
          or subsequent default, misrepresentation or breach of warranty or
          covenant hereunder or  affect in  any way any  rights arising  by
          virtue  of any prior or subsequent such occurrence, and no waiver
          will be effective unless set  forth in writing and signed by  the
          party against whom such waiver is asserted.


                                     -7-

          <PAGE>


          16.  Severability.  Any  term or provision of this Agreement that
               ------------
          is invalid  or unenforceable  in any  situation in  any jurisdiction
          shall not affect the validity or enforceability of the  remaining
          terms and  provisions hereof or the validity or enforceability of
          the offending term or  provision in any other situation or in any
          other jurisdiction.

          17.  Arbitration.   Any disputes  arising under or  in connection
               -----------
          with this  Agreement, including,  without limitation,  those involving
          claims for  specific performance or other  equitable relief, will
          be  submitted   to  binding  arbitration  under   the  Commercial
          Arbitration Rules of  the American Arbitration  Association under
          the  authority of  federal  and state  arbitration statutes,  and
          shall not be the subject of litigation in any forum.  EACH PARTY,
          BY   SIGNING   THIS   AGREEMENT,   VOLUNTARILY,   KNOWINGLY   AND
          INTELLIGENTLY  WAIVES ANY RIGHTS SUCH PARTY MAY OTHERWISE HAVE TO
          SEEK  REMEDIES IN COURT OR  OTHER FORUMS, INCLUDING  THE RIGHT TO
          JURY TRIAL.  The arbitration  will be  conducted only  in Denver,
          Colorado before a single arbitrator  selected by the parties  or,
          if  they are unable to agree on  an arbitrator, before a panel of
          three  arbitrators,  one  selected  by  Buyer,  one  selected  by
          Sellers'  Agent  and   the  third  selected  by   the  other  two
          arbitrators.  The arbitrators shall have  full authority to order
          specific performance and award damages and other relief available
          under this  Agreement  or  applicable  law,  but  shall  have  no
          authority  to add to, detract from, change  or amend the terms of
          this  Agreement or  existing law.   All  arbitration proceedings,
          including  settlements and  awards, shall  be confidential.   The
          decision  of the  arbitrators  will  be  final and  binding,  and
          judgment  on the award by  the arbitrators may  be entered in any
          court of  competent jurisdiction.  THIS  SUBMISSION AND AGREEMENT
          TO ARBITRATE  WILL BE  SPECIFICALLY ENFORCEABLE.   The arbitrator
          will have no  power to  award punitive or  exemplary damages,  to
          ignore or  vary the terms  of this Agreement  or any  Other Buyer
          Agreement or Other Seller  Agreement, and will be bound  to apply
          controlling law.  The party who prevails on entry of the award of
          judgment  will  be entitled  to his  or  its costs  and expenses,
          including reasonable attorney's fees incurred in connection  with
          the arbitration.  A judgment upon the award may be entered in any
          court having jurisdiction.

          18.  Construction.  The Parties have participated jointly in the 
               ------------
          negotiation  and drafting  of this  Agreement.   In the  event an
          ambiguity or  question of  intent or interpretation  arises, this
          Agreement  will be construed as if drafted jointly by the Parties
          and  no presumption  or burden  of proof  will arise  favoring or
          disfavoring  any party by virtue of the  authorship of any of the
          provisions  of this  Agreement.   The  Parties  intend that  each
          representation, warranty and covenant contained herein  will have
          independent   significance.      If  any   Party   breaches   any
          representation,  warranty or  covenant  contained herein  in  any
          respect,  the  fact  that there  exists  another  representation,
          warranty  or  covenant  relating   to  the  same  subject  matter
          (regardless  of the  relative  levels of  specificity) which  the
          Party has not breached will not detract from or mitigate the fact
          that the Party is in breach of the first representation, warranty
          or covenant.

          19.  Incorporation.  The  Exhibits identified  in this  Agreement
               -------------        --------
          are incorporated herein by reference and made a part hereof.


                                     -8-

          <PAGE>


          20.  Sellers' Agent.  Each Seller hereby authorizes and appoints 
               --------------
          Sellers' Agent as its,  his or her exclusive agent  and attorney-
          in-fact  to act  on behalf of  each of  them with  respect to all
          matters  which  are the  subject  of  this Agreement,  including,
          without  limitation,   (a)  receiving  or  giving   all  notices,
          instructions, other communications,  consents or agreements  that
          may be necessary, required or  given hereunder and (b) asserting,
          settling, compromising,  or  defending,  or  determining  not  to
          assert, settle, compromise  or defend, (i)  any claims which  any
          Seller or Escrow  Agent may assert, or have the  right to assert,
          against Buyer or Escrow Agent, or (ii)  any claims which Buyer or
          Escrow Agent may assert, or have the right to assert, against any
          Seller  or Escrow  Agent.   Sellers'  Agent  hereby accepts  such
          authorization and appointment, provided that Sellers' Agent shall
          have no duty or  liability whatsoever to Buyer in his capacity at
          Sellers'   Agent.     Upon  the   receipt  of   written  evidence
          satisfactory  to Buyer to the effect that Sellers' Agent has been
          substituted  as  agent  of  Sellers  by  reason  of  his   death,
          disability  or resignation,  Buyer shall  be entitled to  rely on
          such substituted agent to  the same extent as it  was theretofore
          entitled  to rely upon Sellers' Agent with respect to the matters
          covered by this Section 20.   No Seller shall act with respect to
          any of the matters which are the subject of this Agreement except
          through Sellers' Agent.  Sellers acknowledge and agree that Buyer
          may  deal exclusively  with  Sellers' Agent  in  respect of  such
          matters, that the enforceability of  this Section 20 is  material
          to  Buyer, and that Buyer  has relied upon  the enforceability of
          this  Section 20 in entering into  this Agreement.   In the event
          Sellers' Agent declines to represent  Sellers with respect to any
          matter delegated to Sellers'  Agent under this Agreement, Sellers
          agree that  the affirmative  written determination those  Sellers
          holding more than 50 percent of the interests held by all Sellers
          as set forth on Schedule 3.3 of the Purchase Agreement 
                          ------------
          will constitute the action of all Sellers, and each Seller agrees
          that in such event it will be bound by the  determination of such
          majority  of  Sellers and  will not  seek  to challenge  any such
          determination in any forum.

          21.  Specific Performance.  If any Party fails to perform its 
               --------------------
          obligations  under  this  Article,  the other  Parties  shall  be
          entitled to specific performance in  addition to any other rights
          and remedies available at law or in equity.

          22.  Modification.   This Agreement may not  be amended, modified
               ------------
          or supplemented except by a written instrument signed by each of the
          Parties    or   their    respective   authorized    officers   or
          representatives.

               IN WITNESS WHEREOF, the Parties have executed this Agreement
          as of the date first above written.

                                   BUYER:

                                   ICG COMMUNICATIONS, INC.


                                   By: 
                                   Title:


                                     -9-

          <PAGE>


                                   SELLERS: 

                                   G. Kelley Allen Trust


                                   By: 
                                        G. Kelley Allen, Trustee



                                        Michele R. K. Fought

                                   T & D CONSULTING, INC.


                                   By: 
                                        David Gandini


                                   GORDON B. KOCH DAUGHTERS TRUST


                                   By:
                                        Carole K. Allen, Trustee
                                   By G. Kelley Allen as attorney in fact

                                   ESCROW AGENT:

                                   NORWEST BANK COLORADO, N.A.


                                   By: 
                                   Its:  


                                     -10-


          <PAGE>


                                      EXHIBIT A
                                      ---------

                                   LIST OF SELLERS



               G. Kelley Allen Trust
               Gordon B. Koch Daughters Trust
               Michele R. K. Fought
               T & D Consulting



          <PAGE>

                                      EXHIBIT B
                                      ---------

                              CERTIFICATE OF INCUMBENCY





          <PAGE>


                                      EXHIBIT C
                                      ---------

                  ESCROW AGENT FEES, CHARGES AND OTHER COMPENSATION



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