TELEPHONE & DATA SYSTEMS INC /DE/
8-K, 1999-09-28
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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                                    FORM 8-K

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

      Date of Report (Date of earliest event reported): September 17, 1999
                                                        ------------------

                        TELEPHONE AND DATA SYSTEMS, INC.
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)


    Delaware                       1-14157             36-2669023
- ----------------              ----------------        -------------
(State or other                   (Commission          (IRS Employer
 jurisdiction of                   File Number)        Identification
 incorporation)                                             No.)


   30 North LaSalle Street, Chicago, Illinois                    60602
- -----------------------------------------------------       ----------------
         (Address of principal executive offices)              (Zip Code)

Registrant's telephone number, including area code:  (312) 630-1900


                                 Not Applicable
          (Former name or former address, if changed since last report)






<PAGE>




Item 5.   Other Events.

         On September 20, 1999, Telephone and Data Systems,  Inc. (the "Company"
or "TDS") announced that it will not pursue a spin-off of Aerial Communications,
Inc.  ("Aerial",  NASDAQ:  AERL).  Instead it will exchange its shares in Aerial
Communications  for VoiceStream  Wireless  Corporation  ("VoiceStream",  NASDAQ:
VSTR)  stock in  conjunction  with  the  announced  merger  between  Aerial  and
Voicestream.  As a result of the merger,  the shareholders of Aerial,  including
TDS,  will  have the  right to  receive  .455  shares  of  VoiceStream  Wireless
Corporation  stock  for each  share of  Aerial  stock  they  currently  own.  In
addition,  TDS will  replace  $420 million of its loan to a subsidiary of Aerial
with shares of Aerial at $22 per share.

         This  Current  Report  on Form 8-K is being  filed for the  purpose  of
filing the news release issued by the Company  relating to such announcement and
various  agreements  related to the merger as exhibits.

Item 7.  Financial Statements and Exhibits

           Exhibits

          The exhibits  accompanying  this report are listed in the accompanying
Exhibit Index.




                                        2

<PAGE>



                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned, thereto duly authorized.




Telephone and Data Systems, Inc.
(Registrant)

Date:    September 28, 1999


By:  /s/ SANDRA L. HELTON
- --------------------------------
Sandra L. Helton
Executive Vice President-Finance
(Chief Financial Officer)

                                        3

<PAGE>




                               EXHIBIT INDEX


     Exhibit Number                    Description of Exhibit

         99.1                          News Release dated September 20, 1999

         99.2                          Agreement  and  Plan  of   Reorganization
                                       dated    September    17,    1999   among
                                       VoiceStream     Wireless     Corporation,
                                       VoiceStream Wireless Holding Corporation,
                                       VoiceStream  Subsidiary III  Corporation,
                                       Aerial Communications, Inc. and Telephone
                                       and Data Systems, Inc.

         99.3                          Stockholder   Agreement   dated   as   of
                                       September   17,   1999  by  and   between
                                       Telephone  an  Data  Systems,   Inc.  and
                                       stockholder  of  Aerial   Communications,
                                       Inc.,    and     VoiceStream     Wireless
                                       Corporation,   and  VoiceStream  Wireless
                                       Holding Corporation.

         99.4                          Indemnity Agreement dated as of September
                                       17,  1999,  among  VoiceStream   Wireless
                                       Corporation, VoiceStream Wireless Holding
                                       Corporation, Aerial Communications, Inc.,
                                       Aerial  Operating   Company,   Inc.,  and
                                       Telephone and Data Systems, Inc.

         99.5                          Debt/Equity  Replacement  Agreement dated
                                       as of  September  17,  1999  made  by and
                                       among  Telephone and Data Systems,  Inc.,
                                       Aerial   Communications,   Inc.,   Aerial
                                       Operating  Company,   Inc.,   VoiceStream
                                       Wireless  Corporation,   and  VoiceStream
                                       Wireless Holding Corporation.

         99.6                          Parent Stockholder  Agreement dated as of
                                       September  17,  1999 by and among  Aerial
                                       Communications,  Inc., Telephone and Data
                                       Systems,   Inc.,   VoiceStream   Wireless
                                       Corporation, VoiceStream Wireless Holding
                                       Corporation   and  the   individuals  and
                                       entities set forth on Schedule I.


                                                         4

<PAGE>



         99.7                          Settlement   Agreement   and  Release  is
                                       entered  into  as  of  the  17th  day  of
                                       September  1999 by and among Sonera Ltd.,
                                       Sonera  Corporation  U.S.,  Telephone and
                                       Data Systems, Inc.,Aerial Communications,
                                       Inc., and Aerial Operating Company,  Inc.
                                       This  agreement is joined by  VoiceStream
                                       Wireless   Corporation   and  VoiceStream
                                       Wireless Holding Corporation.

                                                         5

<PAGE>




                                                                    Exhibit 99.1

Contact:          Mark A. Steinkrauss
                  Vice President, Corporate Relations
                  (312) 630-1900  email:  [email protected]

FOR RELEASE: IMMEDIATE


        TDS Announces Aerial Communications to Merge with VoiceStream...
                   Will Not Pursue Tax-Free Spin-Off of Aerial


September  20,  1999,  Chicago,  Illinois -  Telephone  and Data  Systems,  Inc.
[AMEX:TDS]  announced  today  that it will  not  pursue  a  spin-off  of  Aerial
Communications [NASDAQ:AERL]. Instead it will exchange its shares (59,086,000 as
of June 30, 1999) in Aerial  Communications for VoiceStream Wireless Corporation
[NASDAQ: VSTR] stock in conjunction with the announced merger between Aerial and
VoiceStream.  The merger is designed to position  Aerial to take  advantage more
effectively of the outstanding  opportunities  that exist within the GSM segment
of  the  wireless  communications  industry.  As a  result  of the  merger,  the
shareholders  of Aerial,  including  TDS,  will have the right to  receive  .455
shares of VoiceStream  Wireless Corporation stock for each share of Aerial stock
they  currently  own. In addition,  TDS will replace $420 million of its loan to
Aerial  with  shares  of Aerial at $22 per  share.  In total,  TDS will own 35.6
million shares of VoiceStream after the merger.

"We believe the  combined  Aerial-VoiceStream  company will emerge as one of the
leading  wireless  companies.  TDS  is  pleased  to  become  a  significant  and
supportive  shareholder  of the new  company,"  said Ted Carlson,  president and
chief executive officer of TDS.

"Don  Warkentin  and the Aerial  team have made  excellent  progress in building
Aerial to its current  scope.  We believe  that John  Stanton  and the  combined
Aerial-VoiceStream  team will take the larger, national company forward to great
performance for both customers and shareholders."

Mr. Carlson added: "The Aerial merger will enable TDS to focus on its mission to
provide outstanding  communications  services in rural and mid-size markets. Our
post- Aerial balance sheet will show the financial strength and liquidity which,
combined with continuing  excellent financial results from U.S. Cellular and TDS
Telecom, will provide outstanding  opportunities to enhance shareholder value in
the future."

"The  transaction  will enable TDS to direct its cash flow,  which in the recent
past has been used to support the substantial start-up costs at Aerial, to other
purposes. TDS will carefully consider making acquisitions designed to strengthen
its two core businesses,  U.S. Cellular and TDS Telecom,  or using the cash flow
for other purposes  designed to enhance the value of TDS's shares.  In addition,
TDS anticipates that it



<PAGE>



may use a  portion  of its free cash  flow to  repurchase  TDS stock on the open
market as long as it remains an excellent value and market conditions  warrant,"
Carlson said.

TDS is a diversified telecommunications corporation founded in 1969. Through its
strategic business units, U.S. Cellular,  TDS Telecom and Aerial Communications,
TDS operates primarily in cellular,  local telephone and personal communications
services  ("PCS")  markets  around  the  country.   TDS  builds  value  for  its
shareholders by providing excellent  communications services in growing, closely
related  segments of the  telecommunications  industry.  The  Company  currently
employs  approximately  10,000  people and serves 3.3  million  customers  in 35
states.

Except for the historical and factual information  presented,  other information
set forth in this news release represents forward-looking statements,  including
all statements about the Company's plans,  beliefs,  estimates and expectations.
These statements are based on current  estimates and projections,  which involve
certain  risks and  uncertainties  that  could  cause  actual  results to differ
materially from those in the forward-looking statements.  Important factors that
may affect these  forward-looking  statements  include,  but are not limited to:
changes in the overall  economy;  changes in competition in the markets in which
TDS  operates;  advances  in  telecommunications   technology;  changes  in  the
telecommunications  regulatory  environment;   pending  and  future  litigation;
availability of future  financing;  unanticipated  changes in growth in cellular
and PCS customers,  penetration  rates,  churn rates and the mix of products and
services offered; and unanticipated problems with the Year 2000 issue. Investors
are  encouraged  to consider  these and other risks and  uncertainties  that are
discussed in documents filed by TDS with Securities and Exchange Commission.

                                                       -end-




<PAGE>



                                                                    Exhibit 99.2


                      AGREEMENT AND PLAN OF REORGANIZATION


                         Dated as of September 17, 1999


                                      among


                        VoiceStream Wireless Corporation

                    VoiceStream Wireless Holding Corporation

                     VoiceStream Subsidiary III Corporation

                           Aerial Communications, Inc.

                                       and

                        Telephone and Data Systems, Inc.







<PAGE>



                                Table of Contents

Article I - The Reorganization
         Section 1.0       The Reorganization
         Section 1.1       The Merger
         Section 1.2       Closing
         Section 1.3       Effective Time
         Section 1.4       Effects of the Merger
         Section 1.5       Restated Certificate of Incorporation and By-laws;
                              Officers and Directors

Article II - Effect of the Merger on the Stock of the Constituent Corporations;
             Surrender of Certificates
         Section 2.1       Effect on Stock
         Section 2.2       Surrender of Certificates

Article  III -  Representations  and  Warranties  of  the  Company
         Section 3.1       Organization
         Section 3.2       Subsidiaries
         Section 3.3       Capital  Structure
         Section 3.4       Authority
         Section 3.5       Consents and Approvals; No Violations
         Section 3.6       SEC  Documents  and Other  Reports
         Section 3.7       Absence of Material  Adverse Change
         Section 3.8       Information  Supplied
         Section 3.9       Permits;  Compliance  with Laws
         Section 3.10      Tax Matters
         Section 3.11      Liabilities
         Section 3.12      Benefit  Plans;  Employees  and  Employment Practices
         Section 3.13      Litigation
         Section 3.14      Environmental  Matters
         Section 3.15      Section 203 of DGCL
         Section 3.16      Intellectual  Property
         Section 3.17      Opinion of Financial  Advisor
         Section 3.18      Brokers
         Section 3.19      Tax Status
         Section 3.20      Contracts
         Section 3.21      Vote  Required
         Section 3.22      Transactions with Affiliates

Article IV - Representations and Warranties of Parent and Sub
         Section 4.1       Organization
         Section 4.2       Ownership of Merger Subs
         Section 4.3       Capital Structure
         Section 4.4       Authority

                                                         i

<PAGE>



         Section 4.5       Consents and Approvals; No Violations
         Section 4.6       SEC Documents and Other Reports
         Section 4.7       Absence of Material Adverse Change
         Section 4.8       Information Supplied
         Section 4.9       Permits; Compliance with Laws.
         Section 4.10      Tax Matters
         Section 4.11      Liabilities
         Section 4.12      Litigation
         Section 4.13      State Takeover Statutes
         Section 4.14      Brokers
         Section 4.15      Tax Status
         Section 4.16      Interim Operations of Sub
         Section 4.17      Vote Required
         Section 4.18      Transactions with Affiliates
         Section 4.19      Opinion of Goldman, Sachs & Co

Article V - Covenants Relating to Conduct of Business
         Section 5.1       Conduct of Business by the Company Pending the
                           Reorganization
         Section 5.2       Conduct of Business by Parent Pending the
                           Reorganization
         Section 5.3       No Solicitation
         Section 5.4       Third Party Standstill Agreements
         Section 5.5       Disclosure of Certain Matters; Delivery of Certain
                           Filings
         Section 5.6       Tax Status

Article VI - Additional Agreements
         Section 6.1       Employee Benefits
         Section 6.2       Options; Restricted Stock Awards
         Section 6.3       Company Stockholders Meeting
         Section 6.4       Preparation of the Registration Statement and Joint
                           Proxy Statement
         Section 6.5       Comfort Letters
         Section 6.6       Access to Information
         Section 6.7       Compliance with the Securities Act
         Section 6.8       Stock Exchange Listings
         Section 6.9       Fees and Expenses
         Section 6.10      Public Announcements
         Section 6.11      Real Estate Transfer Tax
         Section 6.12      State Takeover Laws
         Section 6.13      Indemnification; Directors and Officers Insurance
         Section 6.14      Best Efforts
         Section 6.15      Certain Litigation
         Section 6.16      Transition Services Agreement
         Section 6.17      Registration Rights Agreement
         Section 6.18      Investor Claim

                                                        ii

<PAGE>



         Section 6.19      Intercompany Service Agreements
         Section 6.20      Revolving Credit Agreement
         Section 6.21      Series A and B Notes
         Section 6.22      Nokia Credit Agreement
         Section 6.23      Intercompany Accounts
         Section 6.24      Tax Allocation Agreement and Tax Settlement Agreement
         Section 6.25      Parent Stockholder Voting Agreement
         Section 6.26      Agreements Regarding Taxes

Article VII - Conditions Precedent
         Section 7.1       Conditions to Each Party's Obligation to Effect the
                           Reorganization
         Section 7.2       Conditions to Obligation of the Company to Effect the
                           Reorganization
         Section 7.3       Conditions to Obligations of Parent and Merger Sub C
                           to Effect the Reorganization

Article VIII -    Termination and Amendment
         Section 8.1       Termination
         Section 8.2       Effect of Termination
         Section 8.3       Amendment
         Section 8.4       Extension; Waiver

Article IX - General Provisions
         Section 9.1       Non-Survival of Representations and Warranties and
                           Agreements
         Section 9.2       Notices
         Section 9.3       Interpretation; Definitions
         Section 9.4       Counterparts
         Section 9.5       Entire Agreement; No Third-Party Beneficiaries
         SECTION 9.6       GOVERNING LAW
         Section 9.7       Assignment
         Section 9.8       Severability
         Section 9.9       Enforcement of this Agreement
         Section 9.10      Obligations of Subsidiaries
         Section 9.11      Reliance on Representations

ANNEX A - RESTATED CERTIFICATE OF INCORPORATION

ANNEX B - COMPANY'S RESTATED BYLAWS

ANNEX C - TRANSITION SERVICES AGREEMENT

ANNEX D - STOCKHOLDER AGREEMENT


                                                        iii

<PAGE>



ANNEX E - INDEMNITY AGREEMENT

ANNEX F - DEBT/EQUITY REPLACEMENT AGREEMENT

ANNEX G - PARENT STOCKHOLDER AGREEMENT

ANNEX H - INVESTOR AGREEMENT

ANNEX I - FORM OF PARENT FCC COUNSEL OPINION

ANNEX J - FORM OF PRESTON GATES & ELLIS LLP OPINION

ANNEX K - FORM OF COMPANY FCC COUNSEL OPINION

ANNEX L - FORM OF SIDLEY & AUSTIN OPINION

ANNEX M - TAX CERTIFICATES

ANNEX N - TAX CERTIFICATES

ANNEX O - STOCKHOLDER TAX CERTIFICATE




                                                        iv

<PAGE>



                      AGREEMENT AND PLAN OF REORGANIZATION

         AGREEMENT  AND PLAN OF  REORGANIZATION,  dated as of September 17, 1999
(this  "Agreement")  among  VoiceStream  Wireless   Corporation,   a  Washington
corporation   ("VoiceStream"),   VoiceStream  Wireless  Holding  Corporation,  a
Delaware  corporation  ("Holding"),  (VoiceStream  and Holding are  collectively
referred to herein as "Parent" as explained  below)  VoiceStream  Subsidiary III
Corporation,  a Delaware  corporation  ("Merger Sub C"), which shall be a wholly
owned  direct   subsidiary  of  Holding  as  of  the  Effective   Time,   Aerial
Communications,  Inc., a Delaware  corporation (the "Company") (Merger Sub C and
the Company  being  hereinafter  collectively  referred  to as the  "Constituent
Corporations"),  and Telephone and Data  Systems,  Inc., a Delaware  corporation
("Series A Stockholder"). Except as otherwise set forth herein, capitalized (and
certain  other)  terms used herein  shall have the meanings set forth in Section
9.3.

                              W I T N E S S E T H:

         WHEREAS,  VoiceStream,  Holding and Omnipoint  Corporation,  a Delaware
corporation   ("Omnipoint"),   have  entered  into  an  Agreement  and  Plan  of
Reorganization dated as of June 23, 1999 (the "Omnipoint  Agreement")  providing
for, among other things,  the merger of a subsidiary of Holding ("Merger Sub A")
into  VoiceStream  (the  "VoiceStream   Merger"),  and  the  merger  of  another
subsidiary  of  Holding   ("Merger  Sub  B")  into  Omnipoint  (the   "Omnipoint
Merger")(the VoiceStream Merger, the Omnipoint Merger and the other transactions
contemplated by the Omnipoint Agreement are herein referred to as the "Omnipoint
Reorganization");

         WHEREAS,  the  reorganization  provided  herein (the  "Reorganization")
shall  include  the  merger  (the  "Merger")  of Merger  Sub C with and into the
Company and, if applicable, the other transactions described below;

         WHEREAS,  if the Omnipoint  Reorganization  is consummated prior to the
consummation of the transactions  contemplated by this Agreement,  and the other
conditions  to the  Reorganization  specified  in Article VII are  satisfied  or
waived, in the Reorganization,  Holding shall be Parent and shall acquire all of
the common  stock of the Company  through  the Merger,  in which case the Merger
will occur as part of and  concurrently  with or  promptly  after the  Omnipoint
Reorganization;

         WHEREAS,  if the transactions  contemplated by the Omnipoint  Agreement
are terminated or not consummated by the Omnipoint End Date (as defined herein),
and the other  conditions  to the  Reorganization  specified  in Article VII are
satisfied or waived by the Omnipoint End Date,  in the  Reorganization,  Holding
shall be Parent and shall  concurrently  acquire (i) all of the common  stock of
the Company  through the Merger and (ii) all of the common stock of  VoiceStream
through the VoiceStream Merger;

         WHEREAS,  the respective  Boards of Directors of VoiceStream,  Holding,
Merger  Sub  C  and  the  Company  have  approved  and  declared  advisable  the
Reorganization,



<PAGE>



upon the terms and  subject  to the  conditions  herein set forth  whereby  each
issued and  outstanding  Series A Common Share,  $1.00 par value, of the Company
("Company Series A Common Shares") and each issued and outstanding Common Share,
$1.00 par value of the Company  ("Company  Common  Shares" and together with the
Company Series A Common Shares,  "Company Common  Stock"),  other than shares of
Company Common Stock owned directly or indirectly by Parent or the Company, will
be converted into shares of Common Stock,  $0.001 par value,  of Parent ("Parent
Common Stock") or, to the extent provided herein, cash;

         WHEREAS, the respective Boards of Directors of VoiceStream, Holding and
the Company have  determined  that the  Reorganization  is in furtherance of and
consistent with their respective  long-term  business  strategies and is fair to
and in the best interests of their respective stockholders;

         WHEREAS,  for federal  income tax  purposes,  it is  intended  that the
Reorganization  shall qualify as a reorganization  within the meaning of Section
368(a) of the United  States  Internal  Revenue  Code of 1986,  as amended  (the
"Code"), and/or as an exchange described in Section 351(a) of the Code;

         WHEREAS,  VoiceStream,  Holding, Merger Sub C and the Company desire to
make certain representations, warranties, covenants and agreements in connection
with  the  Reorganization  and  also  to  prescribe  various  conditions  to the
Reorganization.

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
covenants and  agreements  herein  contained,  and intending to be legally bound
hereby,  VoiceStream,  Holding,  Merger Sub C and the  Company  hereby  agree as
follows:

                         Article I - The Reorganization

         Section 1.0 The  Reorganization.  (a) Holding has caused  Merger Sub A,
Merger Sub B and Merger Sub C to be organized  for the purposes of  effectuating
the Omnipoint  Merger,  the VoiceStream  Merger,  and the Merger.  Merger Sub A,
Merger Sub B and Merger Sub C are collectively referred to as "Merger Subs".

         (b) If the Omnipoint Reorganization is consummated by the Omnipoint End
Date,  the Merger  shall occur as specified  herein as part of and  concurrently
with or promptly after the Omnipoint Reorganization.

         (c) If the  transactions  contemplated  by the Omnipoint  Agreement are
terminated or not consummated by the Omnipoint End Date and the other conditions
to the  Reorganization  specified in Article VII are  satisfied or waived by the
Omnipoint  End Date,  Holding shall  concurrently  acquire (i) all of the common
stock of the Company through the Merger as specified herein, and (ii) all of the
common stock of VoiceStream  through the VoiceStream Merger as specified in this
Section  1.0(c).  In such  event,  pursuant  to Articles of Merger and a Plan of
Merger, in a form to be mutually agreed

                                       -2-

<PAGE>



upon  by  VoiceStream  and  the  Company  (sometimes   hereinafter  referred  to
collectively as the "Merger Document" or "Merger Documents"), upon the terms and
subject  to the  conditions  set  forth  in  this  Agreement  and in the  Merger
Documents:

                  (i) In the  VoiceStream  Merger,  Merger Sub A shall be merged
         with and into VoiceStream in accordance with the applicable  provisions
         of Washington law.  VoiceStream  shall be the surviving  corporation in
         the VoiceStream Merger and shall continue its corporate existence under
         Washington  law.  As a result of the  VoiceStream  Merger,  VoiceStream
         shall  become a wholly  owned  Subsidiary  of Holding.  The effects and
         consequences  of the  VoiceStream  Merger  shall be as set forth in the
         VoiceStream Merger Documents.

                  (ii) The  parties  shall  (i)  file  Merger  Documents  as are
         required by and executed in  accordance  with  Washington  law and (ii)
         make  all  other  filings  or  recordings   required  under  applicable
         Washington law.

                  (iii) In the case of this Section  1.0(c),  the Effective Time
         shall be the later of (i) the date and time of the filing of the Merger
         Documents  with respect to the  VoiceStream  Merger (or such other date
         and time as may be specified  in such  documents as may be permitted by
         Washington  law)  and (ii)  the  date  and  time of the  filing  of the
         Certificate of Merger (as defined below) with respect to the Merger (or
         such other date and time as may be specified in such certificate as may
         be permitted by Delaware law).

                  (iv) At the  Effective  Time,  by  virtue  of the  VoiceStream
         Merger and without any action on the part of any of the  parties,  each
         share of the common stock of Merger Sub A outstanding immediately prior
         to the  Effective  Time shall be  converted  into and shall  become one
         share of common stock of the surviving  corporation of the  VoiceStream
         Merger.

                  (v) At the Effective  Time, the one share of the capital stock
         of Holding issued to VoiceStream and outstanding  immediately  prior to
         the Effective Time shall be cancelled and cease to exist.

                  (vi) At the Effective Time,  each share of VoiceStream  Common
         Stock that is issued and outstanding immediately prior to the Effective
         Time shall be converted  into one share of Holding  Common Stock.  Upon
         such conversion,  all such shares of VoiceStream  Common Stock shall be
         cancelled  and  cease  to  exist,  and  each  certificate   theretofore
         representing  any such shares shall,  without any action on the part of
         the holder  thereof,  be deemed to  represent an  equivalent  number of
         shares of Holding Common Stock.

                  (vii) Notwithstanding the foregoing,  VoiceStream Common Stock
         outstanding  immediately  prior  to the  Effective  Time  and held by a
         holder who has

                                       -3-

<PAGE>



         not voted in favor of the Reorganization and has demanded appraisal for
         such shares in accordance  with  Washington law  ("Dissenting  Shares")
         shall not be converted into a right to receive shares of Holding Common
         Stock unless such holder fails to perfect, withdraws or otherwise loses
         its right to appraisal. If, after the Effective Time, such holder fails
         to  perfect,  withdraws  or loses its right to  appraisal,  such shares
         shall be treated as if they had been converted as of the Effective Time
         into a right to receive Holding Common Stock.

         (d) All representations,  warranties and covenants of Parent are hereby
made on a joint and several basis by VoiceStream and Holding.

         Section  1.1 The Merger.  Upon the terms and subject to the  conditions
hereof,  and in accordance  with the DGCL, in the  Reorganization,  Merger Sub C
shall be merged with and into the Company at the Effective  Time.  Following the
Effective Time, the separate corporate existence of Merger Sub C shall cease and
the  Company  shall  continue  as  the  surviving  corporation  (the  "Surviving
Corporation")  and shall succeed to and assume all the rights and obligations of
Merger Sub C and the Company in accordance with the DGCL.

         Section 1.2 Closing.  Unless  waived by Parent,  the Company and Parent
shall use their  reasonable  commercial  efforts  to cause  the  closing  of the
transactions  contemplated  by this  Agreement  (the  "Closing")  to take  place
concurrently  with the  closing of the  Omnipoint  Reorganization  or as soon as
practicable thereafter,  subject to the satisfaction or waiver of the conditions
set forth in Article VII. If the Omnipoint  Reorganization  does not take place,
the  Closing  will take  place at 10:00  a.m.  on the fifth  Business  Day after
satisfaction  or  waiver of the  conditions  set forth in  Article  VII,  at the
offices of Sidley & Austin, One First National Plaza,  Chicago,  Illinois 60603,
or, at the  request of  Parent,  at the  offices  of Sidley & Austin,  873 Third
Avenue,  New York, New York 10022,  unless another date, time or place is agreed
to in writing by the parties  hereto.  The date on which the Closing takes place
is herein referred to as the "Closing Date."

         Section 1.3 Effective  Time.  The Merger shall become  effective when a
Certificate of Merger (the "Certificate of Merger"), executed in accordance with
the relevant  provisions  of the DGCL, is duly filed with the Secretary of State
of the State of Delaware,  or at such other time as Merger Sub C and the Company
shall agree should be specified in the Certificate of Merger. Except as provided
in Section  1.0(c)(iii),  the term "Effective  Time" shall mean the later of the
date and  time at  which  the  Certificate  of  Merger  is duly  filed  with the
Secretary  of State of the State of Delaware or such later time  established  by
the Certificate of Merger. The filing of the Certificate of Merger shall be made
as soon as practicable  after the  satisfaction  or waiver of the conditions set
forth herein.

         Section 1.4 Effects of the  Merger.  The Merger  shall have the effects
set forth in the DGCL.

                                       -4-

<PAGE>



         Section 1.5 Restated Certificate of Incorporation and By-laws; Officers
and Directors.  (a) The Restated Certificate of Incorporation of the Company, as
in effect  immediately  prior to the Effective Time,  shall be amended as of the
Effective  Time as set forth on Annex A hereto.  As so  amended,  such  Restated
Certificate of Incorporation shall be the Restated  Certificate of Incorporation
of the Surviving  Corporation  until  thereafter  changed or amended as provided
therein or by applicable law.

         (b) The Restated By-laws of the Company, as in effect immediately prior
to the Effective Time, shall be amended as of the Effective Time as set forth on
Annex B. As so  amended,  such  Restated  By-laws  shall be the  By-laws  of the
Surviving  Corporation  until  thereafter  changed or amended as provided by the
Restated  Certificate  of  Incorporation  of  the  Surviving  Corporation  or by
applicable law.

         (c) Subject to Section 2.2 of the Investment  Agreement,  the directors
of Merger Sub C immediately  prior to the Effective  Time shall be the directors
of the Surviving Corporation,  until the next annual meeting of stockholders (or
the  earlier  of their  resignation  or  removal)  and  until  their  respective
successors are duly elected and qualified, as the case may be.

         (d) Subject to the Management Side Letter, the officers of Merger Sub C
immediately  prior to the Effective  Time shall be the officers of the Surviving
Corporation  until the earlier of their  resignation  or removal and until their
respective successors are duly elected and qualified, as the case may be.

Article II - Effect of the Merger on the Stock of the Constituent Corporations;
Surrender of Certificates

         Section 2.1 Effect on Stock. As of the Effective Time, by virtue of the
Merger  and  without  any action on the part of any of Sub,  the  Company or the
holders of any securities of the Constituent Corporations:

         (a) Capital Stock of Sub. Each issued and outstanding  share of capital
stock of Merger Sub C shall be  converted  into and become one  validly  issued,
fully  paid and  nonassessable  share of  Common  Stock,  no par  value,  of the
Surviving Corporation.

         (b) Treasury Stock and Parent Owned Stock. Each share of Company Common
Stock that is owned by the Company or by any  Subsidiary of the Company and each
share of Company Common Stock that is owned by Parent, Merger Sub C or any other
Subsidiary  of Parent shall  automatically  be  cancelled  and retired and shall
cease to exist, and no consideration shall be delivered in exchange therefor.

         (c)  Conversion of Company  Common  Stock.  Except as set forth in Item
2.1(c) of the Company Letter, as of the date hereof, no shares of Company Common
Stock or Stock  Equivalents  were issued,  reserved for issuance or outstanding.
Each share of

                                       -5-

<PAGE>



Company Common Stock issued and outstanding (other than shares of Company Common
Stock to be cancelled in accordance with Section 2.1(b)) shall be converted into
 .455 (the  "Conversion  Number")  validly issued,  fully paid and  nonassessable
shares of Parent Common Stock (the "Per Share Stock  Consideration");  provided,
that each share of Company  Common  Stock with  respect to which an  election to
receive only cash has been  effectively  made by a Public Holder and not revoked
or lost pursuant to Section 2.1(d) (a "Cash Election"),  shall be converted into
the right to  receive  $18.00 in cash,  without  interest  (the "Per  Share Cash
Consideration").  Notwithstanding  the  foregoing,  in the  event  that  (i) the
Omnipoint  Agreement  is  terminated  or the  transactions  contemplated  by the
Omnipoint  Agreement are not  consummated by the Omnipoint End Date and (ii) the
Closing Date Market Price is less than $39.56,  the  Conversion  Number shall be
the amount  determined by dividing $18.00 by the Closing Date Market Price,  but
shall not be greater than .50 or less than .455. In the event Investor exercises
its right under Section 10.6 of the Investment  Agreement  ("Tag-Along  Right"),
the  Operating  Company  Shares owned by Investor  (as  described in the Company
Letter) shall be converted  immediately  prior to the  Effective  Time into such
number of shares of Company Common Stock equal to the product of (i) such number
of  Operating  Company  Shares  and (ii) the  Exchange  Rate,  and the shares of
Company  Common  Stock  obtained by Investor  through such  conversion  shall be
converted  into shares of Parent  Common  Stock  pursuant to the Merger.  In the
event  Investor  does  not  exercise  its  Tag-Along   Right,   subject  to  the
authorization,  execution and delivery of the Indemnity Agreement, Parent hereby
agrees  to  accept  and be  bound  by all of the  rights  of  Investor  and  its
Affiliates under the Investment Agreement and the Joint Venture Agreement. As of
the Effective  Time,  all such shares of Company Common Stock shall be converted
in accordance  with this  paragraph,  and when so converted,  shall no longer be
outstanding  and shall  automatically  be retired and shall cease to exist,  and
each holder of a  certificate  representing  any such  shares of Company  Common
Stock shall cease to have any rights with respect  thereto,  except the right to
receive (i)  certificates  representing  the shares of Parent  Common Stock into
which  such  shares  of  Company  Common  Stock  have been  converted,  (ii) any
dividends and other  distributions  in accordance  with Section 2.2(d) and (iii)
any cash, without interest, to be paid in lieu of any fractional share of Parent
Common Stock in accordance with Section 2.2(e).

         (d) Cash Election by Public Holders.  Each person who, at the Effective
Time, is a record holder of shares of Company Common Stock other than the Series
A  Stockholder,  Investor  (with  respect to Operating  Company  Shares owned by
Investor which are converted into Company Common Stock  immediately prior to the
Merger pursuant to the Tag-Along  Right) and holders of shares of Company Common
Stock to be cancelled  as set forth in Section  2.1(b)  (such  eligible  holders
hereinafter being referred to as the "Public Holders"),  shall have the right to
submit an election  form (the "Cash  Election  Form")  specifying  the number of
shares of Company  Common Stock that such person  desires to have converted into
the right to  receive  the Per Share  Cash  Consideration  pursuant  to the Cash
Election.  Any  eligible  record  holder  who  fails  properly  to submit a Cash
Election Form on or prior to the Election Deadline in

                                       -6-

<PAGE>



accordance  with the  procedures  set  forth  in this  Section  2.1(d)  shall be
entitled to receive the Per Share Stock  Consideration for each share of Company
Common Stock  registered in the name of such holder.  Any Cash Election shall be
validly made only if the Exchange Agent shall have received a Cash Election Form
by 5:00 p.m.,  New York City time on the twentieth  Business Day (the  "Election
Deadline")  after the date on which the Letter of Transmittal  and Cash Election
Form are sent to the  Public  Holders  pursuant  to Section  2.2(b).  For a Cash
Election  made by a Public  Holder to be valid,  a Cash  Election  Form properly
completed and executed (with the signature or signatures  thereon  guaranteed to
the extent  required by the Cash Election Form) must be delivered by such holder
accompanied by such holder's  Certificates,  or by an  appropriate  guarantee of
delivery  of  such  Certificates  from  a  member  of  any  registered  national
securities exchange or of the National  Association of Securities Dealers,  Inc.
or a commercial  bank or trust company in the United States as set forth in such
Cash Election  Form. Any holder of Company Common Stock who has made an election
by submitting  an Election  Form to the Exchange  Agent may at any time prior to
the Election Deadline change such holder's election by submitting a revised Cash
Election  Form and/or a Letter of  Transmittal,  properly  completed and signed,
that is  received by the  Exchange  Agent prior to the  Election  Deadline.  Any
holder of Company  Common Stock may at any time prior to the  Election  Deadline
revoke such holder's  election by written  notice to the Exchange Agent received
by the close of business  on the day prior to the  Election  Deadline,  in which
event  such  holder  shall be  entitled  to  receive  only the Per  Share  Stock
Consideration  with respect to each share of Company Common Stock  registered in
the name of such holder  immediately  prior to the Effective Time.  Parent shall
have the right to make  reasonable  rules  (which will be  described in the Cash
Election Form), not inconsistent with the terms of this Agreement, governing the
validity of Cash Election Forms and the procedures for making Cash Elections.

         (e)  Adjustment of  Conversion  Number.  Except in connection  with the
Omnipoint Agreement, in the event of any reclassification,  stock split or stock
dividend with respect to Parent Common Stock, any change or conversion of Parent
Common Stock into other  securities or any other dividend or  distribution  with
respect to Parent Common Stock (other than normal  quarterly  cash  dividends as
the same may be  modified  from time to time in the  ordinary  course),  or if a
record date with  respect to any of the  foregoing  should  occur,  prior to the
Effective Time, appropriate and proportionate adjustments, if any, shall be made
to the  Conversion  Number and the Per Share Cash  Election  Consideration,  and
thereafter all references in this Agreement to the Conversion Number and the Per
Share Cash Election Consideration shall be deemed to be to the Conversion Number
and the Per Share Cash Election Consideration, respectively, as so adjusted.

         Notwithstanding  the  foregoing,  in the event of any  amendment of the
Omnipoint  Agreement that would result in a  reclassification,  stock split,  or
stock dividend with respect to Parent Common Stock,  any change or conversion of
Parent Common Shares into other securities or any other dividend or distribution
with respect to Parent Common Stock, appropriate and proportionate  adjustments,
if any, shall be made to the

                                       -7-

<PAGE>



Conversion Number and the Per Share Cash Election Consideration,  and thereafter
all references in this Agreement shall be deemed to be the Conversion Number and
the Per Share Cash Election Consideration, respectively, as so adjusted.

         In the event  that the  aggregate  number of shares of  Company  Common
Stock  and  Stock  Equivalents,  not  including  shares  issued  or to be issued
pursuant to the  Debt/Equity  Replacement  Agreement  and to TDS and Investor or
shares which are or may be issued  pursuant to  Performance  Options  ("Adjusted
Fully Diluted Shares") exceeds  85,839,161  shares as of the Effective Time, the
Conversion  Number shall be determined by dividing  39,056,818 by such number of
Adjusted Fully Diluted Shares as of the Effective  Time. The number of shares of
Company Common Stock and Stock Equivalents for the purpose of such recalculation
shall be  determined  in a manner  consistent  with  the  methodologies  used in
preparing Item 2.1(c) of the Company  Letter  including  without  limitation the
shares of Company Common Stock actually outstanding and shares of Company Common
Stock  issuable (i) in exchange for the Operating  Company Shares whether or not
Investor  exercises  its  Tag-Along  Rights as set forth in Section  10.6 of the
Investment  Agreement,  (ii) pursuant to Company Stock Options  determined using
the  treasury  stock  method,  (iii)  pursuant  to  the  Restricted  Stock  Plan
regardless of whether payment for the Restricted  Stock units is made in cash or
Company  Common Stock,  (iv)  pursuant to the  Tax-Deferred  Savings  Plan,  (v)
pursuant to the Compensation Plan for Non-Employee Directors, and (vi) any other
Company Common Stock and Stock Equivalents outstanding as of the Effective Time;
provided,  for the purpose of such  recalculation  the shares of Company  Common
Stock issued or issuable  pursuant to Performance  Options and the shares issued
or issuable  pursuant to the  Debt/Equity  Replacement  Agreement and to TDS and
Investor shall be disregarded for purpose of the  recalculation.  The Conversion
Number shall be subject to further  adjustment as provided in the third sentence
of Section 2.1(c) in the event that the Omnipoint Agreement is terminated or the
transactions  contemplated by the Omnipoint Agreement are not consummated by the
Omnipoint End Date,  provided that the Conversion Number determined  pursuant to
this Section 2.1(e) shall be used in lieu of .455.

         Section 2.2 Surrender of Certificates.  (a) Exchange Agent. ChaseMellon
Shareholder  Services  LLC  shall  act as  exchange  agent  in the  Merger  (the
"Exchange Agent").  As and when needed,  but no later than twenty-five  Business
Days after the Effective Time,  Parent shall deposit with the Exchange Agent, in
trust  for the  holders  of  certificates  (the  "Company  Certificates")  which
immediately  prior to the Effective  Time  represented  shares of Company Common
Stock  converted in the Merger,  (i)  certificates  (the "Parent  Certificates")
representing  the shares of Parent  Common  Stock  issuable  pursuant to Section
2.1(c) with respect to shares of Company  Common Stock which have been converted
into the right to receive  Parent  Common  Stock (such  shares of Parent  Common
Stock,  together  with cash in lieu of  fractional  shares and any  dividends or
distributions  with respect  thereto in  accordance  with  Section  2.2(d) being
hereinafter referred to as the "Stock  Consideration  Fund"), and (ii) cash with
respect to shares of Company  Common Stock with respect to which a Cash Election
has been properly

                                       -8-

<PAGE>



made and not  withdrawn  or lost (the  "Cash  Consideration  Fund")  (the  Stock
Consideration Fund and the Cash  Consideration Fund are hereinafter  referred to
as the "Exchange Fund").

         (b) Exchange  Procedure.  As soon as reasonably  practicable  after the
Effective  Time, but no later than five Business Days after the Effective  Time,
the Surviving  Corporation shall cause the Exchange Agent to mail to each holder
of record of a Company  Certificate,  (i) a letter of  transmittal  (which shall
specify that delivery shall be effected, and risk of loss and title to a Company
Certificate  shall pass,  only upon delivery of such Company  Certificate to the
Exchange  Agent and shall be in a form and have such other  provisions as Parent
may  reasonably  specify),  (ii) with  respect to the Public  Holders,  the Cash
Election  Form and (iii)  instructions  for use in  effecting  the  surrender of
Company  Certificates  in  exchange  for  the  property  described  in the  next
sentence.  Upon surrender for  cancellation to the Exchange Agent of all Company
Certificate(s) held by any holder of record of a Company  Certificate,  together
with such letter of transmittal duly executed,  such holder shall be entitled to
receive in  exchange  therefor  (x) the Per Share Cash  Consideration  if a Cash
Election is properly  and timely made or (y) a Parent  Certificate  (which shall
not include any restrictive legends)  representing the number of whole shares of
Parent Common Stock into which the shares of Company Common Stock represented by
the  surrendered  Company  Certificate(s)  shall  have  been  converted  at  the
Effective Time pursuant to Section 2.1(c),  cash in lieu of any fractional share
of Parent Common Stock in accordance  with Section 2.2(e) and certain  dividends
and other  distributions  in  accordance  with Section  2.2(d);  and the Company
Certificate(s)  so surrendered  shall forthwith be cancelled.  In the event of a
transfer of ownership of shares of Company  Common Stock that is not  registered
in  the  transfer  records  of  the  Company,   cash  or  a  Parent  Certificate
representing  shares of Parent  Common  Stock may be paid to or issued in a name
other  than  that in which  the  Company  Certificate  surrendered  in  exchange
therefor is registered,  if such Company  Certificate shall be properly endorsed
or  otherwise  be in proper form for  transfer  and the person  requesting  such
payment shall pay any transfer or other Taxes  required by reason of the payment
to a person  other than the  registered  holder of such Company  Certificate  or
establish to the  satisfaction  of the Surviving  Corporation  that such Tax has
been  paid or is not  applicable.  Until  surrendered  as  contemplated  by this
Section  2.2,  each  Company  Certificate  shall be deemed at any time after the
Effective  Time to  represent  only the right to receive  (i) the Per Share Cash
Consideration,  subject to the  delivery  of a proper and timely  Cash  Election
Form,  or (ii)(A)  certificates  representing  the shares of Parent Common Stock
into  which the shares of  Company  Common  Stock  represented  by such  Company
Certificate  have been converted,  (B) any dividends and other  distributions in
accordance with Section 2.2(d) and (C) any cash, without interest, to be paid in
lieu of any fractional  share of Parent Common Stock in accordance  with Section
2.2(e).  Parent or the  Exchange  Agent shall be entitled to deduct and withhold
from the  consideration  otherwise  payable  pursuant to this  Agreement  to any
holder of shares of Company  Common Stock such amounts as Parent or the Exchange
Agent is  required  to deduct and  withhold  with  respect to the making of such
payment under the Code or under any provision of state,

                                       -9-

<PAGE>



local or foreign Tax law.  To the extent that  amounts are so withheld by Parent
or the Exchange Agent,  such withheld  amounts shall be treated for all purposes
of this  Agreement  as having  been paid to the  holder of the shares of Company
Common  Stock in respect of which such  deduction  and  withholding  was made by
Parent or the Exchange Agent.

         (c) No Further Ownership Rights in Shares.  All shares of Parent Common
Stock  issued  and cash paid  upon the  surrender  of  Company  Certificates  in
accordance  with the terms of this Article II (including  any cash paid pursuant
to Section  2.2(d) or Section  2.2(e))  shall be deemed to have been issued (and
paid) in full  satisfaction  of all rights  pertaining  to the shares of Company
Common  Stock  theretofore  represented  by such  Company  Certificates.  At the
Effective  Time, the stock  transfer  books of the Company shall be closed,  and
there shall be no further  registration of transfers on the stock transfer books
of the  Surviving  Corporation  of the shares of Company  Common Stock that were
outstanding  immediately  prior to the Effective  Time.  If, after the Effective
Time,  Company  Certificates  are presented to the Surviving  Corporation or the
Exchange Agent for any reason, they shall be cancelled and exchanged as provided
in this Article II.

         (d) Dividends. No dividends or other distributions that are declared on
or after the  Effective  Time on Parent  Common  Stock,  or are  payable  to the
holders of record thereof on or after the Effective  Time,  shall be paid to any
person entitled by reason of the Merger to receive Parent  Certificates,  and no
cash  payment in lieu of any  fractional  share of Parent  Common Stock shall be
paid to any such person pursuant to Section 2.2(e), until such person shall have
surrendered its Company Certificate(s) as provided in Section 2.2(b). Subject to
applicable  law,  there  shall  be  paid  to  each  person  receiving  a  Parent
Certificate:  (i) at the time of such  surrender  or as promptly as  practicable
thereafter,  the amount of any dividends or other distributions theretofore paid
with  respect to the shares of Parent  Common Stock  represented  by such Parent
Certificate  and  having a  record  date on or after  the  Effective  Time and a
payment date prior to such surrender;  and (ii) at the appropriate  payment date
or as promptly as practicable  thereafter,  the amount of any dividends or other
distributions  payable  with  respect to such shares of Parent  Common Stock and
having a record date on or after the Effective  Time but prior to such surrender
and a payment date on or  subsequent  to such  surrender.  In no event shall the
person entitled to receive such dividends or other  distributions be entitled to
receive interest on such dividends or other distributions.

         (e)  No  Fractional  Shares.  No  certificates  or  scrip  representing
fractional  shares of Parent Common Stock shall be issued upon the surrender for
exchange of Company  Certificates  pursuant  to this  Article II; no dividend or
other  distribution  by  Parent  and no stock  split  shall  relate  to any such
fractional  share;  and no such  fractional  share  shall  entitle the record or
beneficial  owner  thereof to vote or to any other  rights of a  stockholder  of
Parent.  In lieu of any such fractional  share, each holder of shares of Company
Common Stock who would  otherwise have been entitled  thereto upon the surrender
of Company Certificate(s) for exchange pursuant to this Article II (other than

                                      -10-

<PAGE>



with  respect  to shares of Company  Common  Stock for which an  effective  Cash
Election  has been  made)  will be paid an  amount in cash  (without  interest),
rounded to the nearest whole cent,  determined by multiplying  (i) the per share
closing price on the Nasdaq National  Market System  ("Nasdaq") of Parent Common
Stock (as reported on the Nasdaq) on the date on which the Effective  Time shall
occur (or,  if Parent  Common  Stock shall not trade on the Nasdaq on such date,
the first day of trading in Parent  Common  Stock on the Nasdaq  thereafter)  by
(ii) the fractional share to which such holder would otherwise be entitled.

         (f)  Termination  of Exchange  Fund.  Any portion of the Exchange  Fund
which remains undistributed to holders of Company Common Stock for twelve months
after the  Effective  Time shall be  delivered to Parent,  upon demand,  and any
holders of Company  Common  Stock who have not  theretofore  complied  with this
Article II and the instructions set forth in the letter of transmittal mailed to
such  holders  after  the  Effective  Time  shall  thereafter  look  only to the
Surviving  Corporation (subject to abandoned property,  escheat or other similar
laws) for  payment of cash  pursuant  to the Cash  Election  or shares of Parent
Common Stock,  any cash in lieu of fractional  shares of Parent Common Stock and
any  dividends or  distributions  with  respect to such shares of Parent  Common
Stock to which they are entitled.

         (g) No  Liability.  None of Parent,  Sub,  the Company or the  Exchange
Agent shall be liable to any person in respect of any cash delivered to a public
official pursuant to any applicable abandoned property, escheat or similar law.


           Article III - Representations and Warranties of the Company

         The  Company  represents  and  warrants  to Parent  and Merger Sub C as
follows:

         Section 3.1  Organization.  The  Company  and each of its  Subsidiaries
(collectively,  the "Company  Subsidiaries")  is a corporation  duly  organized,
validly  existing and in good standing under the laws of the jurisdiction of its
incorporation  and has requisite  corporate  power and authority to carry on its
business as now being  conducted,  except where the failure to be so  organized,
existing and in good  standing or to have such power and  authority  has not had
and would not  reasonably be expected to have a Material  Adverse  Effect on the
Company or prevent or materially delay the  consummation of the  Reorganization.
The Company and each of the Company  Subsidiaries  is duly qualified or licensed
to do business and in good standing in each  jurisdiction in which the nature of
its  business  or  the  ownership  or  leasing  of  its  properties  makes  such
qualification or licensing  necessary,  except in such  jurisdictions  where the
failure to be so duly  qualified  or  licensed  and in good  standing  would not
reasonably  be  expected  to have a Material  Adverse  Effect on the  Company or
prevent or materially delay the consummation of the Reorganization.  The Company
has delivered to Parent complete and correct copies of its Restated  Certificate
of Incorporation and By-laws and has made available to Parent the Certificate of

                                      -11-

<PAGE>



Incorporation and By-laws (or similar  organizational  documents) of each of the
Company Subsidiaries.

         Section 3.2  Subsidiaries.  Item 3.2 of the Company  Letter  lists each
Company Subsidiary and any Investment Entities. All of the outstanding shares of
capital stock of each Company Subsidiary that is a corporation have been validly
issued and are fully paid and nonassessable.  Except as set forth in Item 3.2 of
the  Company  Letter,  all of the  outstanding  shares of capital  stock of each
Subsidiary  of the  Company are owned by the  Company,  by  Subsidiaries  of the
Company or by the Company and Subsidiaries of the Company, free and clear of all
Liens.  Except as set forth in Item 3.2 of the Company  Letter,  (i) the Company
and its  Subsidiaries  have no on-going  obligations,  agreements,  commitments,
rights,  understandings or arrangements with respect to any Investment Entities,
including funding  obligations;  and (ii) all Investment  Interests are owned by
the Company or its Subsidiaries free and clear of all Liens. Except as set forth
in Item 3.2 of the Company  Letter and except for the capital stock owned by the
Company in its  Subsidiaries,  neither the  Company nor any of its  Subsidiaries
owns,  directly or indirectly,  any capital stock or other ownership interest in
any corporation,  partnership, joint venture, limited liability company or other
entity.

         Section 3.3 Capital  Structure.  The  authorized  capital  stock of the
Company  consists of  60,000,000  Company  Series A Common  Shares,  100,000,000
Company Common Shares,  60,000,000 Series B Common Shares,  $1.00 par value (the
"Company  Series B Common  Shares") and  10,000,000  shares of Preferred  Stock,
$1.00 par value (the  "Company  Preferred  Stock").  At the close of business on
September  16, 1999,  (i) no shares of Company  Preferred  Stock and no Series B
Common Shares were outstanding,  (ii) 40,000,000  Company Series A Common Shares
and  31,930,588  Company  Common  Shares were issued and  outstanding,  (iii) no
shares of Company  Common  Stock  were held by the  Company  in  treasury,  (iv)
40,000,000  Company Common Shares were reserved for issuance upon  conversion of
the Company  Series A Common  Shares,  (v) 2,960,480  Company Common Shares were
reserved for issuance  pursuant to outstanding stock options (the "Company Stock
Options") to purchase  Company Common Shares under the Company's 1996 Long- Term
Incentive Plan (the "Company  Long-Term  Incentive Plan"),  (vi) 456,000 Company
Common  Shares were reserved for issuance  pursuant to the  Company's  Retention
Restricted Stock Unit Plan (the "Restricted Stock Plan"),  (vii) 114,514 Company
Common  Shares were reserved for issuance  pursuant to the Tax Deferred  Savings
Plan,  (viii) 6,056 Company Common Shares were reserved for issuance pursuant to
the Company's Compensation Plan for Non-Employee Directors and (ix) as described
in Item 3.2 of the Company  Letter,  Company  Common  Shares were  reserved  for
issuance  to  the  Investor  in  Aerial  Operating  Company,   Inc.  ("Operating
Company").  Except  as set forth  above  and in Item 3.2 and 3.3 of the  Company
Letter,  and except for Company Common Shares which are reserved for issuance in
exchange for shares of Company  Series A Common  Shares in  accordance  with the
Company's  Restated  Certificate  of  Incorporation,  as of the date hereof,  no
shares of Company  Common Stock or shares of capital stock of any  Subsidiary of
the Company were issued, reserved for issuance or

                                      -12-

<PAGE>



outstanding and there are no stock appreciation rights,  phantom stock rights or
other contractual rights the value of which is determined in whole or in part by
the value of any  capital  stock  ("Stock  Equivalents")  of the  Company or any
Subsidiary of the Company.  Each  outstanding  share of Company Common Stock is,
and each share of  Company  Common  Stock  which may be issued  pursuant  to the
Company Benefit Plans and the other agreements and instruments listed above will
be, when issued, duly authorized,  validly issued,  fully paid and nonassessable
and  not  subject  to  preemptive  rights.   There  are  no  outstanding  bonds,
debentures,  notes or other indebtedness of the Company or any Subsidiary of the
Company  having the right to vote (or  convertible  into, or  exchangeable  for,
securities  having  the  right to vote) on any  matter  on which  the  Company's
stockholders  may vote.  Except as set forth above or in Item 3.3 of the Company
Letter,  as of the date of this  Agreement,  there are no  securities,  options,
warrants, calls, rights, commitments,  agreements,  arrangements or undertakings
of any kind obligating the Company or any of the Company  Subsidiaries to issue,
deliver or sell or create, or cause to be issued,  delivered or sold or created,
additional  shares  of  capital  stock  or  other  voting  securities  or  Stock
Equivalents of the Company or of any of the Company  Subsidiaries  or obligating
the Company or any of the Company  Subsidiaries to issue, grant, extend or enter
into any such security,  option,  warrant, call, right,  commitment,  agreement,
arrangement or undertaking.

         Except as set forth in Item 3.3 of the Company  Letter,  as of the date
of this  Agreement,  there are no  outstanding  contractual  obligations  of the
Company or any of the Company  Subsidiaries  to repurchase,  redeem or otherwise
acquire  any  shares  of  capital  stock of the  Company  or any of the  Company
Subsidiaries.

         Section 3.4  Authority.  The Board of Directors  of the  Company,  at a
meeting duly called and held, duly adopted resolutions approving this Agreement,
the  Reorganization  and  the  Stockholder   Agreement,   determining  that  the
Reorganization,  including the Merger, is fair to, and in the best interests of,
the Company's  stockholders  and  recommending  that the Company's  stockholders
adopt this Agreement. The Company has requisite corporate power and authority to
execute and deliver this  Agreement  and,  subject to approval by the  Company's
stockholders of the Reorganization,  to consummate the transactions contemplated
hereby. The execution, delivery and performance of this Agreement by the Company
and the  consummation  by the  Company  of the  Reorganization  and of the other
transactions  contemplated  hereby have been duly  authorized  by all  necessary
corporate  action  on the  part  of the  Company,  subject  to  approval  by the
Company's stockholders of this Agreement and the Reorganization.  This Agreement
has been duly  executed  and  delivered by the Company and  (assuming  the valid
authorization,  execution  and  delivery  of this  Agreement  by Parent and Sub)
constitutes the valid and binding obligation of the Company  enforceable against
the Company in accordance with its terms,  except that such  enforceability  (i)
may be limited by  bankruptcy,  insolvency,  moratorium  or other  similar  laws
affecting or relating to the enforcement of creditors' rights generally and (ii)
is subject to general principles of equity.


                                      -13-

<PAGE>



         Section 3.5 Consents and Approvals; No Violations.  Except as set forth
in Item 3.5 of the Company Letter, except for filings, permits,  authorizations,
consents and approvals as may be required under the Securities Act, the Exchange
Act,  the  Communications  Act,  the HSR Act,  the DGCL,  and  under the  rules,
regulations and published decisions of the FAA, the FCC and state public utility
or service  commissions  or similar  agencies,  and except as may be required in
connection  with the  Transfer  Taxes  described  in Section  6.11,  neither the
execution,  delivery or  performance  of this  Agreement  by the Company nor the
consummation  by the Company of the  transactions  contemplated  hereby will (i)
conflict  with  or  result  in any  breach  of  any  provision  of the  Restated
Certificate  of  Incorporation  or  By-laws  of the  Company  or of the  similar
organizational  documents of any of the Company  Subsidiaries,  (ii) require any
filing with, or permit, authorization,  consent or approval of, any Governmental
Entity  (except  where the  failure  to  obtain  such  permits,  authorizations,
consents or approvals or to make such filings  would not  reasonably be expected
to have a Material  Adverse Effect on the Company or prevent or materially delay
the consummation of the  Reorganization),  (iii) result in a violation or breach
of,  or  constitute  (with or  without  due  notice  or lapse of time or both) a
default (or give rise to any right of  termination,  amendment,  cancellation or
acceleration)  under,  any of the terms,  conditions  or provisions of any note,
bond,  mortgage,   indenture,  lease,  license,  contract,  agreement  or  other
instrument or obligation  to which the Company or any of its  Subsidiaries  is a
party or by which any of them or any of their properties or assets may be bound,
(iv) violate any order, writ, judgment,  injunction,  decree,  statute,  rule or
regulation  applicable to the Company, any of the Company Subsidiaries or any of
their  properties or assets,  or (v) result in the creation or imposition of any
Lien on any  asset of the  Company  or its  Subsidiaries  except  in the case of
clauses (iii),  (iv) or (v) for violations,  breaches or defaults that would not
reasonably  be  expected  to have a Material  Adverse  Effect on the  Company or
prevent or materially delay the consummation of the Reorganization.

         Section 3.6 SEC Documents and Other Reports. The Company has filed with
the SEC all documents  required to be filed by it since April 25, 1996 under the
Securities  Act or the Exchange Act (the "Company SEC  Documents").  As of their
respective  filing  dates,  the Company SEC  Documents  complied in all material
respects with the requirements of the Securities Act or the Exchange Act, as the
case may be, each as in effect on the date so filed,  and at the time filed with
the SEC none of the Company SEC Documents  contained  any untrue  statement of a
material fact or omitted to state 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.  The financial  statements of the Company
included in the Company SEC Documents comply as of their respective dates in all
material  respects  with the then  applicable  accounting  requirements  and the
published  rules and  regulations  of the SEC with  respect  thereto,  have been
prepared in accordance with generally accepted accounting  principles (except in
the case of the  unaudited  statements,  as  permitted  by Form  10-Q  under the
Exchange Act) applied on a consistent  basis during the periods involved (except
as may be indicated therein or in the notes thereto) and fairly present

                                      -14-

<PAGE>



the  consolidated  financial  position  of  the  Company  and  its  consolidated
Subsidiaries  as at the dates  thereof  and the  consolidated  results  of their
operations  and  their  consolidated  cash  flows  for the  periods  then  ended
(subject,  in the  case  of  unaudited  statements,  to  normal  year-end  audit
adjustments and to any other adjustments described therein). The Company and its
Subsidiaries  have not made any material  misstatements  of fact,  or omitted to
disclose  any fact,  to any  Government  Entity or in any  report,  document  or
certificate filed therewith,  which misstatements or omissions,  individually or
in the aggregate,  could reasonably be expected to subject any material licenses
or authorizations  to revocation or failure to renew,  except to the extent that
such revocation or failure to renew would not have a Material  Adverse Effect on
the Company or the transactions contemplated by this Agreement.

         Section 3.7 Absence of Material Adverse Change.  Except as disclosed in
Item 3.7 of the Company Letter or in the documents filed by the Company with the
SEC and publicly  available  prior to the date of this  Agreement  (the "Company
Filed SEC Documents"),  since December 31, 1998 the Company and its Subsidiaries
have conducted their respective  businesses in all material respects only in the
ordinary course,  consistent with past practices, and there has not been (i) any
Material  Adverse  Change with  respect to the  Company,  (ii) any  declaration,
setting aside or payment of any dividend or other  distribution  with respect to
its capital stock or any redemption, purchase or other acquisition of any of its
capital stock, (iii) any split,  combination or  reclassification  of any of its
capital stock or any issuance or the  authorization of any issuance of any other
securities  in  respect  of,  in lieu of or in  substitution  for  shares of its
capital stock, or (iv) any change in accounting methods, principles or practices
by the Company affecting its assets,  liabilities or business, except insofar as
may have been required by a change in generally accepted accounting principles.

         Section 3.8 Information  Supplied.  None of the information supplied or
to be supplied by the Company  specifically  for inclusion or  incorporation  by
reference  in (i)  the  Registration  Statement  or  (ii)  the  proxy  statement
(together  with  any  amendments  or  supplements   thereto,  the  "Joint  Proxy
Statement")  relating to the  Stockholders  Meetings,  will,  in the case of the
Registration  Statement,  at the time it becomes  effective,  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  not
misleading,  or in the case of the  Joint  Proxy  Statement,  at the time of the
mailing of the Joint Proxy Statement,  the time of the Stockholders Meetings and
at the Effective Time,  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
are made,  not  misleading  or necessary to correct any statement in any earlier
communication  with respect to the  solicitation of proxies for the Stockholders
Meetings which has become false or misleading.  The Registration  Statement will
comply (with  respect to the Company) as to form in all material  respects  with
the  requirements  of the  Securities  Act, and the Joint Proxy  Statement  will
comply (with  respect to the Company) as to form in all material  respects  with
the requirements of the Exchange Act.

                                      -15-

<PAGE>



         Section 3.9 Permits;  Compliance with Laws. (a) Each of the Company and
its  Subsidiaries  is in possession of all franchises,  grants,  authorizations,
licenses, permits, easements,  variances,  exceptions,  consents,  certificates,
approvals and orders of any Governmental Entity necessary for the Company or any
of its  Subsidiaries to own, lease and operate its properties or to carry on its
business as it is now being conducted (the "Company Permits"),  except where the
failure to have any of the Company  Permits  would not,  individually  or in the
aggregate, have a Material Adverse Effect on the Company, and, as of the date of
this  Agreement,  no suspension or cancellation of any of the Company Permits is
pending  or, to the  knowledge  of the  Company,  threatened,  except  where the
suspension or cancellation of any of the Company Permits would not reasonably be
expected to, individually or in the aggregate, have a Material Adverse Effect on
the Company.  The businesses of the Company and its  Subsidiaries  are not being
conducted in violation of any law,  ordinance or regulation of any  Governmental
Entity,  except for possible violations that would not reasonably be expected to
have a  Material  Adverse  Effect  on the  Company  or  prevent,  or result in a
material delay in, the consummation of the Reorganization.

                  (b)(i) The Company and each of its Subsidiaries  holds, and is
         qualified  and  eligible to hold,  all material  licenses,  permits and
         other  authorizations  issued or to be issued by the FCC to such entity
         for the operation of their respective businesses,  all of which are set
         forth  in Item  3.9(b)(i)  of the  Company  Letter  (the  "Company  FCC
         Licenses").

                  (ii) The Company FCC  Licenses are valid and in full force and
         effect and neither the  Company nor any of its  Subsidiaries  is or has
         been  delinquent  in  payment on or in  default  under any  installment
         obligation  owed to the United States  Treasury in connection  with the
         Company FCC Licenses.  As used herein, the term "full force and effect"
         means that (i) the orders  issuing the Company FCC Licenses have become
         effective, (ii) no stay of effectiveness of such orders has been issued
         by  the  FCC,  and  (iii)  the  Company  FCC  Licenses  have  not  been
         invalidated by any subsequent published FCC action.

                  (iii) All material  reports and  applications  required by the
         Communications  Act or required to be filed with the FCC by the Company
         or any of its  Subsidiaries  have  been  filed  and  are  accurate  and
         complete in all material respects.

                  (iv) The Company and its  Subsidiaries  are, and have been, in
         compliance   in  all   material   respects   with,   and  the  wireless
         communications  systems  operated  pursuant to the Company FCC Licenses
         are and have been operated in compliance in all material respects with,
         the Communications Act.

                  (v)  There  is  not   pending  as  of  the  date   hereof  any
         application,  petition,  objection, pleading or proceeding with the FCC
         or any public service commission or similar body having jurisdiction or
         authority over the communications

                                      -16-

<PAGE>



         operations of the Company or any of its  Subsidiaries  which  questions
         the validity of or contests any Company FCC License or which presents a
         substantial risk that, if accepted or granted, or concluded  adversely,
         could  result  in  (as  applicable)   the   revocation,   cancellation,
         suspension, dismissal, denial or any materially adverse modification of
         any  Company  FCC  License or  imposition  of any  substantial  fine or
         forfeiture against the Company or any of its Subsidiaries except as set
         forth in Item 3.9(b)(v) of the Company Letter.

                  (vi) No facts are  known to the  Company  or its  Subsidiaries
         which if known by a Governmental Entity of competent jurisdiction would
         present  a  substantial  risk that any  Company  FCC  License  could be
         revoked, cancelled,  suspended or materially adversely modified or that
         any substantial fine or forfeiture could be imposed against the Company
         or any of its Subsidiaries.

         Section  3.10 Tax  Matters.  Except  as set  forth in Item  3.10 of the
Company  Letter or as would not have a Material  Adverse  Effect on the Company,
(i) the Company and each of its  Subsidiaries  have timely filed  (after  taking
into  account any  extensions  to file) all Tax Returns  required to be filed by
them either on a separate or combined or consolidated  basis;  (ii) all such Tax
Returns are complete and accurate and disclose all taxes required to be paid for
the periods covered thereby; (iii) the Company and its Subsidiaries have paid or
caused to be paid all taxes  shown as due on such Tax  Returns and all Taxes for
which no Tax Return  was  required  to be filed,  and the  financial  statements
contained in the most recent Company SEC Documents  reflect an adequate  reserve
for all Taxes  payable  by the  Company  and its  Subsidiaries  for all  taxable
periods  and  portions  thereof  accrued  through  the  date of  such  financial
statements; (iv) none of the Company or any Subsidiary has waived in writing any
statute of limitations in respect of Taxes;  (v) the Tax Returns  referred to in
clause (i) relating to income Taxes have been examined by the appropriate taxing
authority or the period for assessment of the Taxes in respect of which such Tax
Returns were  required to be filed has expired;  (vi) there is no action,  suit,
investigation,  audit,  claim or assessment  pending or proposed in writing with
respect to taxes of the Company or any of its  Subsidiaries;  (vii) there are no
liens for Taxes upon the  assets of the  Company  or any  Subsidiary  except for
liens relating to current Taxes not yet due;  (viii) all Taxes which the Company
or any  Subsidiary is required by law to withhold or to collect for payment have
been duly withheld and collected,  and have been paid or accrued on the books of
the Company or such  Subsidiary;  (ix) none of the Company or any Subsidiary has
been a member of any group of corporations filing Tax Returns on a consolidated,
combined,  unitary  or similar  basis  other than each such group of which it is
currently  a member;  (x) no  deduction  of any amount that would  otherwise  be
deductible  by the Company or any of its  Subsidiaries  with  respect to taxable
periods ending on or before the Effective Time could be disallowed under Section
162(m) of the Code;  (xi)  neither the Company nor any of its  Subsidiaries  has
constituted either a "distributing corporation" or a "controlled corporation" in
a distribution of stock  qualifying for tax-free  treatment under Section 355 of
the Code (a) in the two years  prior to the date of this  Agreement  or (b) in a
distribution which could otherwise constitute part of a "plan" or

                                      -17-

<PAGE>



"series of related  transactions"  (within the meaning of Section  355(e) of the
Code) in conjunction with the Reorganization;  (xii) neither the Company nor any
of its  Subsidiaries  is a "United  States real  property  holding  corporation"
within the meaning of Section  897(c)(2) of the Code;  and (xiii) as a result of
the  Reorganization,  neither the Company nor Parent will be obligated to make a
payment to an individual that would be a "parachute  payment" to a "disqualified
individual"  as those  terms are  defined  in Section  280G of the Code  without
regard to whether such payment is reasonable  compensation for personal services
performed or to be performed in the future.

         Section 3.11 Liabilities.  Except as set forth in the Company Filed SEC
Documents or Item 3.11 of the Company Letter, neither the Company nor any of its
Subsidiaries has any liabilities or obligations of any nature (whether  accrued,
absolute,  contingent or otherwise)  required by generally  accepted  accounting
principles  to be set forth on a  consolidated  balance sheet of the Company and
its Subsidiaries or in the notes thereto, other than liabilities and obligations
incurred  in the  ordinary  course  of  business  since  December  31,  1998 and
liabilities  which would not,  individually  or in the aggregate,  reasonably be
expected to have a Material Adverse Effect on the Company.

         Section 3.12 Benefit  Plans;  Employees and Employment  Practices.  (a)
Except as  disclosed in the Company  Filed SEC  Documents or Item 3.12(a) of the
Company Letter,  neither the Company nor any of its  Subsidiaries has adopted or
amended in any material respect any Company ERISA Benefit Plan since the date of
the most recent audited financial  statements  included in the Company Filed SEC
Documents.  Except as set  forth in Item  3.12(a)  of the  Company  Letter,  the
Company  does not have any  commitment  to create,  adopt or  contribute  to any
additional plan covering any active, former or retired employees of the Company.
Except as  disclosed  in Item  3.12(a) of the  Company  Letter or in the Company
Filed SEC Documents,  as of the date of this Agreement,  there exist no material
employment,  consulting,  severance,  bonus, incentive or termination agreements
between  the  Company  or any of its  Subsidiaries  and any  current  or  former
employee, officer or director of the Company or any of its Subsidiaries.

         (b) Item  3.12(b) of the  Company  Letter  contains a list of all ERISA
Benefit  Plans  sponsored  by the Company or its ERISA  Affiliates.  None of the
Company,  any of its  Subsidiaries,  any  officer  of the  Company or any of its
Subsidiaries or any of the ERISA Benefit Plans has on or before the date of this
Agreement  engaged in a "prohibited  transaction"  (as defined in Section 406 of
ERISA or Section 4975 of the Code) with  respect to any ERISA  Benefit Plan that
could reasonably be expected to subject the Company,  any of its Subsidiaries or
any officer of the Company or any of its  Subsidiaries  to any  material  Tax on
prohibited  transactions  imposed by Section 4975 of the Code or to any material
liability  under Section  502(i) or (l) of ERISA where the Tax or liability that
would be reasonably  expected to occur would have a Material  Adverse  Effect on
the Company.  Except as disclosed in Item 3.12(b) of the Company Letter, none of
the Company,  its Subsidiaries or any ERISA Affiliate has at any time during the
five-year  period  preceding the date hereof  contributed to any  "multiemployer
plan" (as

                                      -18-

<PAGE>



defined in Section 3(37) of ERISA).

         (c) Except as  disclosed  in Item  3.12(c) of the Company  Letter,  and
except for such matters as could not be  reasonably  expected to have a Material
Adverse Effect on the Company, to the extent applicable,  (i) each Company ERISA
Benefit Plan complies  with the  requirements  of ERISA and the Code,  (ii) each
Company ERISA Benefit Plan intended to be qualified under Section 401 (a) of the
Code has been determined by the Internal  Revenue Service to be so qualified and
nothing has occurred since the date of that  determination that could reasonably
be  expected  to  adversely  affect  the  qualified  status of such plan and its
related trust is tax-exempt  and has been so since its creation,  and (iii) each
Company ERISA Benefit Plan has been  maintained and  administered  in compliance
with its terms and with the  requirements  prescribed  by any and all  statutes,
orders, rules and regulations,  including but not limited to ERISA and the Code,
which are applicable to such Company ERISA Benefit Plans.

         (d) Except as  disclosed  in Item  3.12(d) of the Company  Letter,  all
material  contributions,  reserves  or premium  payments  to the  Company  ERISA
Benefit Plan, accrued to the date hereof have been made or provided for.

         (e) Except as  disclosed  in Item  3.12(e) of the Company  Letter,  and
except for any liability as could not be reasonably  expected to have a Material
Adverse Effect on the Company,  the Company has not incurred any liability under
Subtitle C or D of Title IV of ERISA with respect to any "single- employer plan"
within the  meaning of  Section  4001(a)(15)  of ERISA,  currently  or  formerly
maintained  by Company,  or any entity which is  considered  one  employer  with
Company under Section 4001 of ERISA.

         (f) Except as  disclosed  in Item  3.12(f) of the Company  Letter,  the
Company has no obligation for retiree health and life benefits under any Company
ERISA  Benefit  Plan,  except as required to avoid  excise  taxes under  Section
4980(B) of the Code and the terms of the Company  ERISA Benefit Plans permit the
Company to amend or terminate such Company ERISA Benefit Plans without incurring
liability thereunder.

         (g) Except as  disclosed  in Item 3.12 (g) of the Company  Letter,  the
Company has not engaged in, nor is it a successor  or parent  corporation  to an
entity that has engaged in a transaction described in Section 4069 of ERISA.

         (h) Except as disclosed  in Item  3.12(h) of the Company  Letter or the
Company Filed SEC Documents, neither the Company nor any of its ERISA Affiliates
has any current or  projected  liability in respect of post  employment  or post
retirement welfare benefits for retired or former employees of the Company.

         (i) Except as disclosed in Item 3.12(i) of the Company  Letter,  no tax
under  Section  4980B of the Code has been  incurred  in respect of any  Company
ERISA Benefit Plan that is a group health plan, as defined in Section 5000(b)(1)
of the Code.


                                      -19-

<PAGE>



         (j) Except as disclosed in Item  3.12(j) of the Company  Letter,  as of
the date of this Agreement there is no pending dispute, arbitration, claim, suit
or grievance  involving a Company  Benefit  Plan (other than routine  claims for
benefits  payable under any such Company Benefit Plan) that would  reasonably be
expected to have a Material Adverse Effect on the Company.

         (k) Item 3.12(k) of the Company  Letter  contains a list setting  forth
the name and  current  annual  salary  and other  compensation  payable  to each
Significant Employee,  and the profit sharing, bonus or other form of additional
compensation  paid or payable by the Company or its  Subsidiaries  to or for the
benefit of each such person for the current fiscal year.  Except as set forth in
Item  3.12(k) of the  Company  Letter,  there are no oral or written  contracts,
agreements or arrangements  obligating the Company or any of its Subsidiaries to
increase the compensation or benefits  presently being paid or hereafter payable
to any  Significant  Employees or any oral  employment  or consulting or similar
arrangements regarding any Significant Employee which are not terminable without
liability on thirty days' or less prior notice and lists all written  employment
and consulting agreements with respect to any Significant Employee.  The Company
has provided true and correct copies of all employment agreements listed on Item
3.12(k).  Except for severance obligations to Significant Employees set forth in
Item 3.12(k) of the Company Letter, there is not due or owing and there will not
be due and owing at the Effective Time to any  Significant  Employees,  any sick
pay,  severance  pay (whether  arising out of the  termination  of a Significant
Employee prior to, on, or subsequent to the Effective Time), compensable time or
pay, including salary,  commission and bonuses, personal time or pay or vacation
time or  vacation  pay  attributable  to  service  rendered  on or  prior to the
Effective  Time.  Except as disclosed in Item 3.12(k) of the Company  Letter and
other than claims made in the ordinary  course of business  consistent with past
practice in an aggregate  amount not to exceed $500,000  neither the Company nor
any of its Subsidiaries  have any liability  arising out of claims made or suits
brought  (including  workers'  compensation  claims  and  claims  or  suits  for
contribution to, or indemnification  of, third parties,  occupational health and
safety,  environmental,  consumer  protection or equal  employment  matters) for
injury, sickness, disease, discrimination, death or termination of employment of
any Significant  Employee, or other employment matter to the extent attributable
to an event  occurring or a state of facts existing on or prior to the Effective
Time.

         (l) The Company and each of its  Subsidiaries (i) is in compliance with
all  applicable  Federal  and  state  laws,  rules  and  regulations  respecting
employment,  employment practices,  terms and conditions of employment and wages
and hours,  in each case,  with respect to Company  Employees,  except where the
failure  to be in  compliance  would  not,  singly or in the  aggregate,  have a
Material  Adverse  Effect on the  Company  or any of its  Subsidiaries  or their
financial  condition or business;  (ii) has withheld all amounts required by law
or by agreement to be withheld  from the wages,  salaries and other  payments to
Company Employees;  (iii) is not liable for any arrears of wages or any taxes or
any penalty for  failure to comply  with any of the  foregoing,  except as would
reasonably be expected to not have a Material Adverse Effect on the

                                      -20-

<PAGE>



Company;  and (iv) (other than routine  payments to be made in the normal course
of business and consistent  with past practice) is not liable for any payment to
any trust or other fund or to any governmental or administrative authority, with
respect to unemployment compensation benefits, Social Security or other benefits
for Company Employees.

         (m) Except as disclosed in Item  3.12(m) of the Company  Letter,  as of
the date of this Agreement there are no material  controversies,  strikes,  work
stoppages or disputes pending between the Company or any of its Subsidiaries and
any current or former employees, and no organizational effort by any labor union
or other  collective  bargaining unit currently is under way with respect to any
employee, which in any such case would reasonably be expected to have a Material
Adverse Effect on the Company. None of the Company or any of its Subsidiaries is
a party  to a  collective  bargaining  agreement.  Except  as set  forth in Item
3.12(m) of the Company  Letter,  there is no, and there is not  threatened,  any
labor   dispute,   grievance  or  litigation   relating  to  labor,   safety  or
discrimination  matters  involving  any Company  Employee  including  charges of
unfair  labor  practices  or  discrimination  complaints,  which,  if  adversely
determined,  would  reasonably  be  expected  to  have,  individually  or in the
aggregate,  a  Material  Adverse  Effect  on the  Company.  There  has  been  no
engagement  in any unfair  labor  practices  by the Company or its  Subsidiaries
within the meaning of the National Labor Relations Act which would reasonably be
expected to have, individually or in the aggregate, a Material Adverse Effect on
the Company.

         Section 3.13 Litigation.  Except with respect to the matters  addressed
in Annex E hereto or as disclosed  in Item 3.13 of the Company  Letter or in the
Company Filed SEC Documents, as of the date of this Agreement, there is no suit,
action,  proceeding or  investigation  pending or, to the  Company's  knowledge,
threatened, against the Company or any of its Subsidiaries that, individually or
in the aggregate, would reasonably be expected to have a Material Adverse Effect
on  the  Company  or  prevent  or  materially  delay  the  consummation  of  the
Reorganization. Except as disclosed in Item 3.13 of the Company Letter or in the
Company Filed SEC Documents,  neither the Company nor any of its Subsidiaries is
subject to any  outstanding  judgment,  order,  writ,  injunction or decree that
would,  individually  or in the  aggregate,  reasonably  be  expected  to have a
Material  Adverse  Effect on the  Company  or prevent  or  materially  delay the
consummation of the Reorganization.

         Section 3.14 Environmental Matters.  Except as set forth in the Company
Filed SEC Documents or in Item 3.14 of the Company  Letter,  neither the Company
nor  any  of  its   Subsidiaries  has  (i)  not  been  in  compliance  with  any
Environmental Laws or Environmental Permits,  except for such non-compliance as,
taken  individually  or in the  aggregate,  would not  reasonably be expected to
result in a Material  Adverse  Effect on the Company or its  Subsidiaries;  (ii)
stored,  released or disposed of any Hazardous Substances on, under or at any of
the Company's or any of its  Subsidiaries'  properties or any other  properties,
other than in a manner that would not, in all such cases taken  individually  or
in the aggregate, reasonably be expected to result in a Material Adverse

                                      -21-

<PAGE>



Effect on the Company,  (iii) any  knowledge  of the  presence of any  Hazardous
Substances  that have been released into the  environment on, under or at any of
the Company's or any of its Subsidiaries' properties other than that which would
not  reasonably  be  expected  to result  in a  Material  Adverse  Effect on the
Company,  or (iv)  received  any  written  notice  (A) of any  violation  of any
applicable  Environmental  Law that has not been  resolved  or settled  with the
relevant  Governmental  Entity and with respect to which there are no continuing
material  obligations,  (B) of the institution or pendency of any suit,  action,
claim, proceeding or investigation by any Governmental Entity or any third party
in connection with any such violation,  (C) by any Governmental Entity requiring
remediation  of Hazardous  Substances at or arising from any of the Company's or
any of its  Subsidiaries'  properties  or any  other  properties,  (D)  alleging
noncompliance  by the Company or any of its  Subsidiaries  with the terms of any
permit required under any  Environmental  Law in any manner reasonably likely to
require  material  expenditures or to result in material  liability that has not
been  resolved  or settled  and with  respect to which  there are no  continuing
material  obligations or (E) demanding payment for response to or remediation of
Hazardous  Substances  at or  arising  from any of the  Company's  or any of its
Subsidiaries'  properties or any other  properties,  except in each case for the
notices set forth in Item 3.14 of the Company Letter and except in each case for
notices that would not, individually or in the aggregate, reasonably be expected
to result in a Material Adverse Effect on the Company.

         Section  3.15  Section  203  of  DGCL.  Under  the  Company's  Restated
Certificate of  Incorporation,  Section 203 of the DGCL is  inapplicable  to the
Reorganization,  this Agreement and the Stockholder  Agreement and, accordingly,
neither  such  Section  nor,  to  the  knowledge  of  the  Company,   any  other
antitakeover or similar statute or regulation  applies to any such transactions.
To the knowledge of the Company,  no other  "control share  acquisition,"  "fair
price,"  "moratorium" or other  antitakeover  laws or regulations  enacted under
U.S.  federal or state laws applicable to the Company apply to this Agreement or
any of the transactions related thereto.

         Section 3.16  Intellectual  Property.  Item 3.16 of the Company  Letter
sets forth a complete list of all Intellectual  Property  Rights.  Except as set
forth in the Company Filed SEC Documents or in Item 3.16 of the Company  Letter,
the  Intellectual  Property Rights consist solely of items and rights which are:
(i) owned by the  Company or its  Subsidiaries,  (ii) in the public  domain,  or
(iii) rightfully used by Company or its Subsidiaries pursuant to a license, and,
with  respect  to  Intellectual  Property  Rights  owned by the  Company  or its
Subsidiaries,  the Company or its Subsidiaries  own the entire right,  title and
interest  in and to such  Intellectual  Property  Rights  free and  clear of any
Liens.  The Company  and its  Subsidiaries  have all rights in the  Intellectual
Property Rights necessary to carry out the current and anticipated future (up to
the Closing)  activities of the Company and its  Subsidiaries.  The Intellectual
Property  Rights do not  infringe on any  proprietary  right of any  Person.  No
claims (x) challenging the validity,  effectiveness, or ownership by the Company
or its  Subsidiaries of any of the Intellectual  Property Rights,  or (y) to the
effect that the Intellectual Property Rights infringe or will

                                      -22-

<PAGE>



infringe on any intellectual  property or other  proprietary right of any person
have been asserted or, to the Company's knowledge,  are threatened by any person
nor to the  Company's  knowledge  are there any valid  grounds for any bona fide
claim of any such  kind.  To the best of the  Company's  knowledge,  there is no
material  unauthorized  use,  infringement  or  misappropriation  of  any of the
Intellectual  Property Rights by any third party, employee or former employee of
the Company or its Subsidiaries.

         Section 3.17 Opinion of Financial Advisor. The Company has received the
opinion  of  Donaldson  Lufkin  &  Jenrette  Securities   Corporation  ("Company
Financial  Advisor"),  dated the date hereof, to the effect that, as of the date
hereof, the  consideration to be received in the Reorganization by the Company's
stockholders  is fair to the Company's  stockholders  from a financial  point of
view, a copy of which opinion has been delivered to Parent.

         Section  3.18  Brokers.  Except for the Company  Financial  Advisor and
Wasserstein  Perella & Company,  Inc.,  the  financial  advisor  to the  Special
Committee of the Board of  Directors  of the  Company,  the fees and expenses of
each of which will be paid by the Company (and are reflected in agreements  with
the Company, true and correct copies of which have been furnished to Parent), no
broker, investment banker, financial advisor or other person, is entitled to any
broker's,  finder's,  financial  advisor's or other similar fee or commission in
connection  with the  transactions  contemplated  by this  Agreement  based upon
arrangements made by or on behalf of the Company.

         Section  3.19 Tax Status.  To the  knowledge  of the Company  after due
investigation,  neither  the  Company  nor any of its  Affiliates  has taken any
action or failed to take any action which action or failure would jeopardize the
qualification of either the Merger or the VoiceStream Merger as a reorganization
within the meaning of Section 368(a) of the Code and/or as part of a transaction
described in Section  351(a) of the Code.  To the knowledge of the Company after
due investigation,  there are no facts or circumstances  relating to the Company
or its  Affiliates,  including  any  covenants  or  undertakings  of the Company
pursuant to this  Agreement,  that would prevent Sidley & Austin from delivering
the opinion referred to in Section 7.2(b) as of the date hereof.

         Section 3.20  Contracts.  Except as set forth in the Company  Filed SEC
Documents or in Item 3.20 of the Company Letter,  neither the Company nor any of
its Subsidiaries is a party to or bound by (i) any "material  contract" (as such
term  is  defined  in  Item  601(b)(10)  of  Regulation  S-K of the  SEC) or any
agreement,  contract or commitment the loss or termination of which would have a
Material Adverse Effect on the Company;  (ii) any  non-competition  agreement or
any other  agreement or obligation  which  materially  limits or will materially
limit the Company or any of its  Subsidiaries  from  engaging in the business of
providing  wireless   communications   services  or  from  developing   wireless
communications  technology  anywhere  in the  world;  or  (iii)  any  management
agreement,  technical  services agreement or other agreement whereby the Company
or any of its  Subsidiaries is provided or is required to provide  management or
technical services to any other Person. With such exceptions as,

                                      -23-

<PAGE>



individually  or in the  aggregate,  have not had,  and would not be  reasonably
expected to have, a Material Adverse Effect on the Company or its  Subsidiaries,
(x) each of the  contracts,  agreements  and  commitments  of the Company or its
Subsidiaries  is valid and in full force and effect and (y)  neither the Company
nor any of its  Subsidiaries  has  violated  any  provision  of, or committed or
failed to perform any act which, with or without notice, lapse of time, or both,
would constitute a default under the provisions of any such contract,  agreement
or  commitment.  To the knowledge of the Company,  no  counterparty  to any such
contract, agreement or commitment has violated any provision of, or committed or
failed to perform any act which, with or without notice,  lapse of time, or both
would  constitute  a default  or other  breach  under the  provisions  of,  such
contract,  agreement  or  commitment,  except for  defaults or  breaches  which,
individually  or in the  aggregate,  have not had,  or would not  reasonably  be
expected to have, a Material Adverse Effect on the Company or its  Subsidiaries.
Neither the Company nor any of its  Subsidiaries  is a party to, or  otherwise a
guarantor  of or liable with respect to, any  interest  rate,  currency or other
swap or derivative  transaction,  other than any such transactions which are not
material to the  business of the  Company or its  Subsidiaries.  The Company has
provided or made available to Parent a copy of each agreement  described in item
(i), (ii) and (iii) above.

         Section 3.21 Vote  Required.  The only vote of the holders of any class
or series of capital  stock of the Company  necessary to approve this  Agreement
and the transactions  contemplated hereby is the affirmative vote of the holders
of a majority of the outstanding shares of Company Common Stock.

         Section 3.22 Transactions with Affiliates.  Except as described in Item
3.22 of the Company Letter or the Company Filed SEC  Documents,  no Affiliate of
the Company nor any stockholder,  officer, director, partner, member, consultant
or employee  of any  thereof,  is at the date hereof a party to any  transaction
with  the  Company  or  any of  its  Subsidiaries,  including  any  contract  or
arrangement  providing for the  furnishing  of services to or by,  providing for
rental of real or personal  property  (including  intellectual  property)  to or
from,  or  otherwise  requiring  payments  to or from the  Company or any of its
Subsidiaries, or any Affiliate thereof.


          Article IV - Representations and Warranties of Parent and Sub

         Parent  and  Merger  Sub C  represent  and  warrant  to the  Company as
follows:

         Section 4.1 Organization.  Parent,  Sub, Merger Sub A, Merger Sub B and
each of Parent's  Subsidiaries  (collectively,  the "Parent  Subsidiaries") is a
corporation duly organized, validly existing and in good standing under the laws
of the  jurisdiction of its  organization  and has requisite  corporate or other
organizational  power  and  authority  to carry  on its  business  as now  being
conducted,  except  where the failure to be so  organized,  existing and in good
standing  or to have  such  power  and  authority  has not  had  and  would  not
reasonably be expected to have a Material Adverse Effect on Parent

                                      -24-

<PAGE>



or prevent or materially delay the consummation of the  Reorganization.  Each of
Parent and Merger Sub C is duly qualified or licensed to do business and in good
standing  in each  jurisdiction  in which  the  nature  of its  business  or the
ownership or leasing of its  properties  makes such  qualification  or licensing
necessary,  except  in  such  jurisdictions  where  the  failure  to be so  duly
qualified or licensed and in good standing  would not  reasonably be expected to
have a Material  Adverse  Effect on Parent or prevent  or  materially  delay the
consummation of the Reorganization.

         Section 4.2 Ownership of Merger Subs. All of the outstanding  shares of
capital stock of each Merger Sub have been validly issued and are fully paid and
nonassessable. All of the outstanding shares of capital stock of each Merger Sub
are owned by Holding.

         Section 4.3 Capital Structure.  The authorized capital stock of Holding
consists  of  400,000,000  shares of common  stock,  par value  $0.001 per share
("Holding Common Stock"), of which one share has been issued to VoiceStream at a
price of $2.00 as of the date hereof,  and 5,000,000  shares of preferred stock,
par value $0.001 per share, none of which are outstanding as of the date hereof.
The authorized  capital stock of VoiceStream  consists of 300,000,000  shares of
VoiceStream common stock  ("VoiceStream  Common Stock") and 50,000,000 shares of
VoiceStream preferred stock ("VoiceStream  Preferred Stock"). As of the close of
business on September 15, 1999, (i) there were outstanding  95,765,505 shares of
VoiceStream  Common Stock  (inclusive of all shares of restricted  stock granted
under  any  compensatory  plans  or  arrangements);  (ii)  7,600,000  shares  of
VoiceStream  common Stock had been authorized  pursuant to the VoiceStream stock
option plan (the  "VoiceStream  Option  Plan"),  of which  4,590,542  shares are
issued and outstanding;  (iii) 1,000,000 shares of VoiceStream  Common Stock had
been authorized  pursuant to the  VoiceStream  employee stock purchase plan (the
"VoiceStream  ESPP"),  of which  158,092  shares have been issued;  (iv) 200,000
shares of VoiceStream  Common Stock had been  authorized  under the  VoiceStream
executive  restricted stock plan (the  "VoiceStream  ERSP"),  of which no shares
have been issued; (v) no phantom shares or stock units had been issued under any
stock option,  compensation or deferred  compensation  plan or arrangement  with
respect  to  VoiceStream  Common  Stock;  and (vi)  there  were  outstanding  no
VoiceStream  warrants for VoiceStream  Common Stock and no shares of VoiceStream
Preferred Stock. Each outstanding share of VoiceStream Common Stock is, and each
share  of  VoiceStream  Common  Stock  which  may  be  issued  pursuant  to  the
VoiceStream ESPP or VoiceStream ERSP will be, when issued in accordance with the
respective  terms  thereof,  duly  authorized,  validly  issued,  fully paid and
nonassessable  and not subject to preemptive  rights.  There are no  outstanding
bonds,  debentures,  notes or other  indebtedness of Parent or any Subsidiary of
Parent  having the right to vote (or  convertible  into,  or  exchangeable  for,
securities   having  the  right  to  vote)  on  any  matter  on  which  Parent's
stockholders may vote. Except for this Agreement,  as set forth above or in Item
4.3 of the  Parent  Letter,  as of the  date of  this  Agreement,  there  are no
securities,   options,   warrants,  calls,  rights,   commitments,   agreements,
arrangements or undertakings of any kind obligating Parent or any of the

                                      -25-

<PAGE>



Parent Subsidiaries to issue,  deliver or sell or create, or cause to be issued,
delivered or sold or created, additional shares of capital stock or other voting
securities or Stock  Equivalents of Parent or of any of the Parent  Subsidiaries
or obligating Parent or any of the Parent  Subsidiaries to issue,  grant, extend
or enter into any such  security,  option,  warrant,  call,  right,  commitment,
agreement, arrangement or undertaking.

         As of the date of this Agreement,  there are no outstanding contractual
obligations of Parent or any of the Parent Subsidiaries to repurchase, redeem or
otherwise  acquire  any shares of  capital  stock of Parent or any of the Parent
Subsidiaries.

         Section 4.4 Authority.  The Board of Directors of Parent,  at a meeting
duly called and held, duly adopted  resolutions  approving this  Agreement,  the
Reorganization   and   the   Stockholder   Agreement,   determining   that   the
Reorganization,  including  the Merger,  and the  issuance  (the  "Parent  Share
Issuance")   of  shares  of  Parent   Common  Stock  in   accordance   with  the
Reorganization, is fair to, and in the best interests of, Parent's stockholders.
The Board of Directors of Merger Sub C has declared the Reorganization advisable
and  approved  this  Agreement.  Parent  and  Merger  Sub C have  the  requisite
corporate  power and  authority  to execute and deliver  this  Agreement  and to
consummate the transactions  contemplated  hereby.  The execution,  delivery and
performance of this Agreement by Parent and Merger Sub C and the consummation by
Parent  and  Merger Sub C of the  Reorganization  and of the other  transactions
contemplated  hereby have been duly authorized by all necessary corporate action
on the part of Parent and Merger  Sub C subject,  in the case of Parent,  to the
approval  of the  Reorganization  and the  Parent  Share  Issuance  by  Parent's
stockholders.  This Agreement has been duly executed and delivered by Parent and
Merger Sub C and  (assuming the valid  authorization,  execution and delivery of
this Agreement by the Company)  constitutes the valid and binding  obligation of
each of Parent and Merger Sub C  enforceable  against each of them in accordance
with  its  terms,  except  that  such  enforceability  (i)  may  be  limited  by
bankruptcy,  insolvency,  moratorium or other similar laws affecting or relating
to the enforcement of creditors' rights generally and (ii) is subject to general
principles of equity.  The Parent Share  Issuance,  the filing of a registration
statement on Form S-4 with the SEC by Parent under the  Securities  Act of 1933,
as amended,  for the purpose of registering the shares of Parent Common Stock to
be issued in connection with the Reorganization (together with any amendments or
supplements  thereto,  whether prior to or after the effective date thereof, the
"Registration  Statement")  have  been  duly  authorized  by  Parent's  Board of
Directors.

         Section 4.5 Consents and Approvals; No Violations.  Except as set forth
in Item 4.5 of the Parent Letter, except for filings,  permits,  authorizations,
consents  and  approvals  as  may  be  required  under,   and  other  applicable
requirements of, the Securities Act, the Exchange Act, the  Communications  Act,
the HSR Act, the DGCL, and under the rules,  regulations and published decisions
of the FAA, the FCC and state public  utility or service  commissions or similar
agencies,  and except as may be required in connection  with the Transfer  Taxes
described in Section 6.11, neither the execution,

                                      -26-

<PAGE>



delivery or  performance  of this  Agreement  by Parent and Merger Sub C nor the
consummation by Parent and Merger Sub C of the transactions  contemplated hereby
will  (i)  conflict  with  or  result  in any  breach  of any  provision  of the
respective  certificate  of  incorporation  or By-laws  of Parent and Sub,  (ii)
require any filing with, or permit,  authorization,  consent or approval of, any
Governmental   Entity   (except  where  the  failure  to  obtain  such  permits,
authorizations,  consents  or  approvals  or to  make  such  filings  would  not
reasonably be expected to have a Material Adverse Effect on Parent or prevent or
materially  delay the  consummation  of the  Reorganization),  (iii) result in a
violation  or breach of, or  constitute  (with or without due notice or lapse of
time or both) a default  (or give rise to any right of  termination,  amendment,
cancellation or acceleration) under, any of the terms,  conditions or provisions
of any note, bond, mortgage,  indenture,  license, lease, contract, agreement or
other  instrument or obligation to which Parent or any of its  Subsidiaries is a
party or by which any of them or any of their properties or assets may be bound,
(iv) violate any order, writ, judgment,  injunction,  decree,  statute,  rule or
regulation  applicable  to  Parent,  any of  its  Subsidiaries  or any of  their
properties or assets, or (v) result in the creation or imposition of any Lien on
any asset of the  Company  or its  Subsidiaries  except  in the case of  clauses
(iii),  (iv)  or (v)  for  violations,  breaches  or  defaults  that  would  not
reasonably be expected to have a Material Adverse Effect on Parent or prevent or
materially delay the consummation of the Reorganization.

         Section 4.6 SEC Documents and Other Reports.  Parent has filed with the
SEC all documents  required to be filed by it since  December 31, 1998 under the
Securities  Act or the Exchange Act (the  "Parent SEC  Documents").  As of their
respective  filing  dates,  the Parent SEC  Documents  complied in all  material
respects with the requirements of the Securities Act or the Exchange Act, as the
case may be, each as in effect on the date so filed,  and at the time filed with
the SEC none of the Parent SEC  Documents  contained  any untrue  statement of a
material fact or omitted to state 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.  The  financial  statements  of Parent
included in the Parent SEC Documents  comply as of their respective dates in all
material  respects  with the then  applicable  accounting  requirements  and the
published  rules and  regulations  of the SEC with  respect  thereto,  have been
prepared in accordance with generally accepted accounting  principles (except in
the case of the  unaudited  statements,  as  permitted  by Form  10-Q  under the
Exchange Act) applied on a consistent  basis during the periods involved (except
as may be  indicated  therein or in the notes  thereto)  and fairly  present the
consolidated  financial position of Parent and its consolidated  Subsidiaries as
at the dates thereof and the consolidated  results of their operations and their
consolidated  cash flows for the  periods  then ended  (subject,  in the case of
unaudited  statements,  to normal  year-end audit  adjustments  and to any other
adjustments  described  therein).  Parent and its Subsidiaries have not made any
material  misstatements  of fact,  or  omitted  to  disclose  any  fact,  to any
Government  Entity or in any report,  document or certificate  filed  therewith,
which  misstatements  or  omissions,  individually  or in the  aggregate,  could
reasonably  be expected to subject any material  licenses or  authorizations  to
revocation

                                      -27-

<PAGE>



or failure to renew,  except to the extent  that such  revocation  or failure to
renew  would not have a Material  Adverse  Effect on Parent or the  transactions
contemplated by this Agreement.

         Section 4.7 Absence of Material Adverse Change.  Except as disclosed in
Item 4.7 of the Parent Letter or in the  documents  filed by Parent with the SEC
and publicly  available  prior to the date of this  Agreement (the "Parent Filed
SEC  Documents"),  since  December  31,  1998 Parent and its  Subsidiaries  have
conducted  their  respective  businesses  in all material  respects  only in the
ordinary course,  consistent with past practices, and there has not been (i) any
Material Adverse Change with respect to Parent,  (ii) any  declaration,  setting
aside or payment  of any  dividend  or other  distribution  with  respect to its
capital stock (other than regular  quarterly cash  dividends) or any redemption,
purchase  or other  acquisition  of any of its capital  stock,  (iii) any split,
combination or  reclassification  of any of its capital stock or any issuance or
the authorization of any issuance of any other securities in respect of, in lieu
of or in  substitution  for shares of its capital  stock,  or (iv) any change in
accounting  methods,  principles  or practices by Parent  affecting  its assets,
liabilities or business, except insofar as may have been required by a change in
generally accepted accounting principles.

         Section 4.8 Information  Supplied.  None of the information supplied or
to be  supplied  by  Parent  specifically  for  inclusion  or  incorporation  by
reference in (i) the  Registration  Statement or (ii) the Joint Proxy Statement,
will,  in the  case  of the  Registration  Statement,  at the  time  it  becomes
effective,  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 not misleading,  or in the case of the Joint Proxy Statement,
at the  time of the  mailing  of the  Joint  Proxy  Statement,  the  time of the
Stockholders Meetings and at the Effective Time, 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 are made, not misleading or necessary to correct
any statement in any earlier  communication  with respect to the solicitation of
proxies for the Stockholders Meetings which has become false or misleading.  The
Registration  Statement  will comply (with  respect to Parent) as to form in all
material  respects with the  requirements  of the  Securities  Act and the Joint
Proxy  Statement will comply (with respect to Parent) as to form in all material
respects with the requirements of the Exchange Act.

         Section 4.9 Permits;  Compliance  with Laws. (a) Each of Parent and its
Subsidiaries  is  in  possession  of  all  franchises,  grants,  authorizations,
licenses,  permits,  charters,  easements,  variances,   exceptions,   consents,
certificates,  approvals  and orders of any  Governmental  Entity  necessary for
Parent or any of its Subsidiaries to own, lease and operate its properties or to
carry on its  business  as it is now being  conducted  (the  "Parent  Permits"),
except  where  the  failure  to  have  any  of the  Parent  Permits  would  not,
individually or in the aggregate, have a Material Adverse Effect on Parent, and,
as of the date of this Agreement, no suspension or cancellation of any of

                                      -28-

<PAGE>



the Parent Permits is pending or, to the knowledge of Parent, threatened, except
where the  suspension  or  cancellation  of any of the Parent  Permits would not
reasonably be expected to have,  individually  or in the  aggregate,  a Material
Adverse Effect on Parent.  The businesses of Parent and its Subsidiaries are not
being  conducted  in  violation  of any  law,  ordinance  or  regulation  of any
Governmental Entity, except for possible violations that would not reasonably be
expected to have a Material  Adverse  Effect on Parent or prevent or  materially
delay the consummation of the Reorganization.

                  (b)(i)  Parent  and  each of its  Subsidiaries  holds,  and is
         qualified  and  eligible to hold,  all material  licenses,  permits and
         other  authorizations  issued or to be issued by the FCC to such entity
         for the operation of their respective businesses,  all of which are set
         forth in Item 4.9(b)(i) of Parent Letter (the "Parent FCC Licenses").

                  (ii)  Parent  FCC  Licenses  are valid  and in full  force and
         effect and neither  Parent nor any of its  Subsidiaries  is or has been
         delinquent in payment on or in default under any installment obligation
         owed to the  United  States  Treasury  in  connection  with  Parent FCC
         Licenses.  As used herein,  the term "full force and effect" means that
         (i) the orders  issuing the Parent FCC Licenses have become  effective,
         (ii) no stay of  effectiveness  of such  orders has been  issued by the
         FCC, and (iii) the Parent FCC Licenses have not been invalidated by any
         subsequent published FCC action.

                  (iii) All material  reports and  applications  required by the
         Communications  Act or  required  to be filed with the FCC by Parent or
         any of its  Subsidiaries  have been filed and are accurate and complete
         in all material respects.

                  (iv)  Parent  and its  Subsidiaries  are,  and have  been,  in
         compliance   in  all   material   respects   with,   and  the  wireless
         communications systems operated pursuant to Parent FCC Licenses are and
         have been  operated in compliance in all material  respects  with,  the
         Communications Act.

                  (v)  There  is  not   pending  as  of  the  date   hereof  any
         application,  petition,  objection, pleading or proceeding with the FCC
         or any public service commission or similar body having jurisdiction or
         authority  over the  communications  operations of Parent or any of its
         Subsidiaries which questions the validity of or contests any Parent FCC
         License or which  presents a  substantial  risk that,  if  accepted  or
         granted,  or concluded  adversely,  could result in (as applicable) the
         revocation,   cancellation,   suspension,   dismissal,  denial  or  any
         materially adverse modification of any Parent FCC License or imposition
         of any  substantial  fine or  forfeiture  against  Parent or any of its
         Subsidiaries except as set forth in Item 4.9(b)(v) of Parent Letter.

                  (vi) No facts are known to Parent or its Subsidiaries which if
         known by a Governmental Entity of competent  jurisdiction would present
         a substantial risk

                                      -29-

<PAGE>



         that any Parent FCC License could be revoked,  cancelled,  suspended or
         materially   adversely   modified  or  that  any  substantial  fine  or
         forfeiture could be imposed against Parent or any of its Subsidiaries.

         Section  4.10 Tax  Matters.  Except  as set  forth in Item  4.10 of the
Parent  Letter or as would not have a Material  Adverse  Effect on  Parent,  (i)
Parent and each of its Subsidiaries have timely filed (after taking into account
any extensions to file) all Tax Returns required to be filed by them either on a
separate  or  combined  or  consolidated  basis;  (ii) all such Tax  Returns are
complete and accurate and disclose all Taxes required to be paid for the periods
covered  thereby;  (iii) Parent and its  Subsidiaries  have paid or caused to be
paid all Taxes  shown as due on such Tax  Returns and all Taxes for which no Tax
Return was required to be filed, and the financial  statements  contained in the
most  recent  Parent SEC  Documents  reflect an  adequate  reserve for all Taxes
payable by Parent and its  Subsidiaries  for all taxable  periods  and  portions
thereof  accrued  through the date of such  financial  statements;  (iv) none of
Parent or any  Subsidiary  has waived in writing any statute of  limitations  in
respect of Taxes;  (v) the Tax  Returns  referred  to in clause (i)  relating to
income  taxes have been  examined by the  appropriate  taxing  authority  or the
period for  assessment  of the Taxes in respect of which such Tax  Returns  were
required to be filed has expired; (vi) there is no action, suit,  investigation,
audit,  claim or assessment pending or proposed in writing with respect to Taxes
of Parent or any of its  Subsidiaries;  (vii)  there are no liens for Taxes upon
the  assets of Parent or any  Subsidiary  except for liens  relating  to current
Taxes not yet due;  (viii) all Taxes which Parent or any  Subsidiary is required
by law to  withhold  or to  collect  for  payment  have been duly  withheld  and
collected,  and  have  been  paid or  accrued  on the  books of  Parent  or such
Subsidiary; (ix) none of Parent or any Subsidiary has been a member of any group
of  corporations  filing Tax  Returns on a  consolidated,  combined,  unitary or
similar basis other than each such group of which it is currently a member;  (x)
no deduction of any amount that would  otherwise be  deductible by Parent or any
of its  Subsidiaries  with  respect to taxable  periods  ending on or before the
Effective  Time  could be  disallowed  under  Section  162(m) of the Code;  (xi)
neither  Parent nor any of its  Subsidiaries  is a "United  States real property
holding  corporation"  within the meaning of Section  897(c)(2) of the Code; and
(xii) as a result of the Reorganization,  Parent will not be obligated to make a
payment to an individual that would be a "parachute  payment" to a "disqualified
individual"  as those  terms are  defined  in Section  280G of the Code  without
regard to whether such payment is reasonable  compensation for personal services
performed or to be performed in the future.

         Section 4.11  Liabilities.  Except as set forth in the Parent Filed SEC
Documents,   to  the  knowledge  of  Parent,  neither  Parent  nor  any  of  its
Subsidiaries has any liabilities or obligations of any nature (whether  accrued,
absolute,  contingent or otherwise)  required by generally  accepted  accounting
principles  to be set forth on a  consolidated  balance  sheet of Parent and its
Subsidiaries  or in the notes thereto,  other than  liabilities  and obligations
incurred  in the  ordinary  course  of  business  since  December  31,  1998 and
liabilities  which would not,  individually  or in the aggregate,  reasonably be
expected

                                      -30-

<PAGE>



to have a Material Adverse Effect on Parent.

         Section 4.12 Litigation. Except as disclosed in Item 4.12 of the Parent
Letter or in the Parent Filed SEC Documents,  as of the date of this  Agreement,
there is no suit,  action,  proceeding or investigation  pending or, to Parent's
knowledge,   threatened,  against  Parent  or  any  of  its  Subsidiaries  that,
individually  or in the  aggregate,  would  reasonably  be  expected  to  have a
Material   Adverse  Effect  on  Parent  or  prevent  or  materially   delay  the
consummation  of the  Reorganization.  Except as  disclosed  in Item 4.12 of the
Parent Letter or in the Parent Filed SEC  Documents,  neither  Parent nor any of
its Subsidiaries is subject to any outstanding judgment, order, writ, injunction
or decree that would,  individually or in the aggregate,  reasonably be expected
to have a Material  Adverse Effect on Parent or prevent or materially  delay the
consummation of the Reorganization.

         Section 4.13 State Takeover  Statutes.  To the knowledge of Parent,  no
state antitakeover statute or similar statute or regulation applicable to Parent
is applicable to this Agreement or the transactions  contemplated hereby. To the
knowledge  of  Parent,  no other  "control  share  acquisition,"  "fair  price,"
"moratorium"  or other  antitakeover  laws or  regulations  enacted  under  U.S.
federal or state laws applicable to Parent apply to this Agreement or any of the
transactions related thereto.

         Section 4.14 Brokers. No broker,  investment banker,  financial advisor
or other person, other than Goldman, Sachs & Co., the fees and expenses of which
will be paid by Parent (and are reflected in an agreement between Goldman, Sachs
& Co. and Parent, is entitled to any broker's,  finder's, financial advisor's or
other similar fee or commission in connection with the transactions contemplated
by this Agreement based upon arrangements made by or on behalf of Parent.

         Section  4.15  Tax  Status.  To  the  knowledge  of  Parent  after  due
investigation,  neither Parent nor any of its Affiliates has taken any action or
failed  to take  any  action  which  action  or  failure  would  jeopardize  the
qualification of either the Merger or the VoiceStream Merger as a reorganization
within the meaning of Section 368(a) of the Code and/or as part of a transaction
described in Section  351(a) of the Code.  To the  knowledge of Parent after due
investigation,  there are no facts or  circumstances  relating  to Parent or its
Affiliates,  including any covenants or undertakings of the Company  pursuant to
this  Agreement,  that would prevent Jones,  Day, Reavis & Pogue from delivering
the opinion referred to in Section 7.3(b) as of the date hereof.

         Section 4.16 Interim  Operations of Sub. Merger Sub C was formed solely
for the purpose of engaging in the transactions contemplated hereby, has engaged
in no  other  business  activities  and has  conducted  its  operations  only as
contemplated hereby.

         Section 4.17 Vote  Required.  The only vote of the holders of any class
or series of capital stock of Parent necessary to approve this Agreement and the
transactions

                                      -31-

<PAGE>



contemplated  hereby is (i) with  respect to the  transactions  contemplated  by
Sections 1.0(b) or 1.0(c),  the affirmative vote of the holders of two-thirds of
the  outstanding  shares of Parent  Common  Stock and (ii) with  respect  to the
Parent Share Issuance,  the affirmative vote of the holders of a majority of the
outstanding shares of Parent Common Stock.

         Section 4.18 Transactions with Affiliates.  Except as described in Item
4.18 of Parent  Letter or the Parent SEC  Documents,  no Affiliate of Parent nor
any stockholder,  officer, director,  partner, member, consultant or employee of
any thereof, is at the date hereof a party to any transaction with Parent or any
of its  Subsidiaries,  including any contract or  arrangement  providing for the
furnishing  of  services  to or by,  providing  for  rental of real or  personal
property  (including  intellectual  property) to or from, or otherwise requiring
payments to or from Parent or any of its Subsidiaries, or any Affiliate thereof.

         Section  4.19 Opinion of Goldman,  Sachs & Co.  Parent has received the
oral opinion of Goldman,  Sachs & Co. on the date hereof to the effect that,  as
of the date hereof, the consideration to be paid by Parent in the Reorganization
is fair to the Parent's stockholders from a financial point of view.


              Article V - Covenants Relating to Conduct of Business

         Section  5.1   Conduct  of   Business   by  the  Company   Pending  the
Reorganization.  During the  period  from the date of this  Agreement  until the
Effective Time, the Company shall,  and shall cause each of its Subsidiaries to,
in all material respects, except as contemplated by this Agreement, carry on its
business in the ordinary  course as currently  conducted.  Without  limiting the
generality  of the  foregoing,  and  except as  otherwise  contemplated  by this
Agreement  (including the Annexes hereto) or as disclosed in the Company Letter,
during  such  period,  the  Company  shall not,  and shall not permit any of its
Subsidiaries to, without the prior written consent of Parent:

         (a) (i) declare,  set aside or pay any  dividends on, or make any other
distributions  in respect of, or redeem or repurchase,  any of its capital stock
or other equity interest, except for dividends by a Subsidiary of the Company to
its parent or (ii) split,  combine or  reclassify  any of its  capital  stock or
other equity interest or issue or authorize the issuance of any other securities
in respect of, in lieu of or in substitution for shares of its capital stock;

         (b) issue,  deliver,  sell, pledge or otherwise  encumber any shares of
its capital stock or other equity interest,  any other voting  securities or any
securities convertible into, or any rights,  warrants or options to acquire, any
such  shares,  voting  securities  or  convertible  securities,  other  than the
issuance of shares of Company Common Stock under the Company Long-Term Incentive
Plan, Company Restricted Stock Plan or Tax Deferred Savings Plan in the ordinary
course or pursuant to the Investment Agreement;

                                      -32-

<PAGE>



         (c) amend its Restated Certificate of Incorporation or By-laws or other
similar organizational documents;

         (d)  acquire,  or agree to  acquire,  in a single  transaction  or in a
series  of  related  transactions,  any  business  or  assets,  other  than  (i)
transactions  that are in the  ordinary  course of business,  and which  involve
individually  or in the  aggregate a purchase  price not in excess of $5,000,000
and (ii) capital expenditures described in paragraph (e) below;

         (e)  make or  agree  to make any new  capital  expenditure  other  than
expenditures  contemplated  by the Company's  capital budget for fiscal 1999 and
expenditures  not in excess  of the  dollar  amount  included  in the  Company's
business plan for fiscal 2000;

         (f) sell, lease, license, encumber or otherwise dispose of, or agree to
sell, lease, license, encumber or otherwise dispose of, any of its assets, other
than  transactions that are in the ordinary course of business and which involve
assets having a current value not in excess of $5,000,000 individually or in the
aggregate;

         (g)  increase the salary or wages  payable or to become  payable to its
directors, officers or employees, except for increases required under employment
agreements  existing on the date hereof,  and except for  increases for officers
and employees in the ordinary course of business consistent with past practices;
or enter into any employment or severance  agreement with, or establish,  adopt,
enter into or amend,  or make any  grants or awards  under,  any  bonus,  profit
sharing, thrift, stock option, restricted stock, pension,  retirement,  deferred
compensation,  employment,  termination or severance plan, agreement,  policy or
arrangement for the benefit of, any director,  officer or employee,  except,  in
each case, in the ordinary  course of business  consistent  with past  practices
(including  those with respect to the timing and amount of, and persons entitled
to,  grants and  awards),  or as may be  required by the terms of any such plan,
agreement, policy or arrangement or to comply with applicable law;

         (h)  except  as may be  required  as a result  of a change in law or in
generally  accepted  accounting  principles,  make any  change in its  method of
accounting or its fiscal year;

         (i) enter into, modify in any material  respect,  amend in any material
respect or terminate any material  contract or agreement to which the Company or
any of its  Subsidiaries  is a party,  or waive,  release or assign any material
rights or claims,  in each case, in any manner  adverse to the Company or any of
its Subsidiaries;

         (j) amend any term of any of its outstanding securities in any material
respect;

         (k) adopt a plan or  agreement  of  complete  or  partial  liquidation,
dissolution,  merger,  consolidation,  restructuring,  recapitalization or other
material reorganization;

                                      -33-

<PAGE>



         (l) incur,  assume or guarantee  any material  Indebtedness  other than
pursuant  to  agreements  in effect on the date hereof and listed in the Company
Letter;

         (m) create,  incur,  assume or suffer to exist any Lien upon any of its
property,  assets or revenues,  whether now owned or hereafter  acquired,  other
than Liens incurred in the ordinary course of business or to secure Indebtedness
or other obligations permitted by this Agreement;

         (n) create, incur, assume or suffer to exist any obligation whereby the
Company or its Subsidiaries  guarantees any Indebtedness,  leases,  dividends or
other obligations of any third party;

         (o) make any loan, advance or capital contributions to or investment in
any  Person,  other  than  loans,   advances  or  capital  contributions  to  or
investments in its wholly owned Subsidiaries;

         (p) enter into any agreement or arrangement  that materially  limits or
otherwise  materially  restricts the Company,  any of its Subsidiaries or any of
their respective  Affiliates or any successor  thereto or that could,  after the
Effective Time, limit or restrict Parent, any of its Subsidiaries, the Surviving
Corporation  or any of  their  Affiliates,  from  engaging  in the  business  of
providing wireless communications services or developing wireless communications
technology  anywhere  in the  world or  otherwise  from  engaging  in any  other
business;

         (q)   settle,   or  propose  to  settle,   any   material   litigation,
investigation, arbitration, proceeding or other claim;

         (r) make any  material  tax  election or enter into any  settlement  or
compromise of any material tax liability;

         (s)  take  any  action,  other  than  as  expressly  permitted  by this
Agreement,  that  would  make any  representation  or  warranty  of the  Company
hereunder inaccurate in any material respect at the Effective Time; or

         (t) enter into any contract, agreement, commitment or arrangement to do
any of the foregoing.

         Section 5.2 Conduct of Business by Parent  Pending the  Reorganization.
During the period  from the date of this  Agreement  until the  Effective  Time,
except as  contemplated  by this  Agreement or the Omnipoint  Agreement,  Parent
shall not, and shall not permit any of its  Subsidiaries  to,  without the prior
written consent of the Company (which consent shall not be unreasonably withheld
or delayed):

         (a) amend its articles or certificate of incorporation, bylaws or other
applicable governing instrument;

                                      -34-

<PAGE>



         (b)  amend  any  terms of the  shares  of  Parent  Common  Stock in any
material respect;

         (c) split, combine, subdivide or reclassify any shares of Parent Common
Stock or declare,  set aside or pay any dividend or other distribution  (whether
in cash,  stock or  property  or any  combination  thereof) in respect of Parent
Common Stock,  except for (i) regular  quarterly  cash  dividends,  (ii) regular
dividends on any future series of preferred  stock pursuant to the terms of such
securities,  or (iii)  dividends paid by any Parent  Subsidiary to Parent or any
Parent Subsidiary that is, directly or indirectly, wholly owned by Parent;

         (d) take any  action  that would or would  reasonably  be  expected  to
prevent,  impair or  materially  delay the ability of Parent to  consummate  the
transactions contemplated by this Agreement;

         (e) change (i) its methods of accounting or accounting practices in any
material respect except as required by concurrent  changes in generally accepted
accounting principles or by law or (ii) its fiscal year;

         (f) enter into or acquire any new line of business that (i) is material
to Parent and (ii) is not  strategically  related  to the  current  business  or
operations of Parent;

         (g) agree or commit to do any of the foregoing;

provided,  however,  that nothing herein shall preclude or restrict  Parent from
consummating the transactions contemplated by the Omnipoint Agreement.

         Section  5.3 No  Solicitation.  (a)  From  the date  hereof  until  the
termination hereof, the Company will not, and will cause its Affiliates, and the
officers,  directors,  employees,  investment bankers,  attorneys,  accountants,
consultants or other agents or advisors of the Company and its  Affiliates,  not
to, directly or indirectly: (i) take any action to solicit, initiate, facilitate
or encourage the submission of any Acquisition Proposal;  (ii) other than in the
ordinary course of business and not related to an Acquisition  Proposal,  engage
in any discussions or negotiations with, or disclose any non-public  information
relating  to the  Company  or any of its  Subsidiaries  or afford  access to the
properties,  books or records of the Company or any of its  Subsidiaries to, any
Person who is known by the Company to be  considering  making,  or has made,  an
Acquisition Proposal; (iii) (A) approve any transaction under Section 203 of the
Delaware Law or (B) approve of any Person's becoming an "interested stockholder"
under Section 203 of Delaware Law or (iv) enter into any agreement  with respect
to an Acquisition  Proposal.  Nothing  contained in this Agreement shall prevent
the Board of Directors of the Company  from  complying  with Rule 14e-2 and Rule
14d-9 under the 1934 Act with regard to an Acquisition Proposal;  provided, that
the Board of Directors of the Company shall not recommend that the  stockholders
of the Company  tender their shares in connection  with a tender offer except to
the extent the Board of Directors of

                                      -35-

<PAGE>



the Company by a majority vote determines in its good faith judgment that such a
recommendation  is required to comply with the fiduciary  duties of the Board of
Directors of the Company to shareholders  under  applicable  Delaware Law, after
receiving the advice of outside legal counsel.

         (b) The Company will notify Parent promptly (but in no event later than
24  hours)  after  receipt  by the  Company  (or  any of  its  advisors)  of any
Acquisition  Proposal,  or of any request (other than in the ordinary  course of
business and not related to an Acquisition Proposal) for non-public  information
relating  to  the  Company  or  any of its  Subsidiaries  or for  access  to the
properties,  books or records of the Company or any of its  Subsidiaries  by any
Person  who is known to be  considering  making,  or has  made,  an  Acquisition
Proposal.  The Company shall provide such notice orally and in writing and shall
identify  [the  Person  making,  and] the  terms  and  conditions  of,  any such
Acquisition  Proposal or request.  The Company shall keep Parent fully informed,
on a prompt  basis (but in any event no later than 24 hours),  of the status and
details of any such  Acquisition  Proposal or request.  The Company  shall,  and
shall cause its  Subsidiaries  and the directors,  employees and other agents of
the Company and the Company  Subsidiaries to, cease  immediately and cause to be
terminated all activities, discussions or negotiations, if any, with any Persons
conducted prior to the date hereof with respect to any Acquisition Proposal.

         Section 5.4 Third Party Standstill Agreements. Subject to the fiduciary
responsibilities  of the Board of Directors  of the  Company,  during the period
from the date of this  Agreement  through the Effective  Time, the Company shall
enforce and shall not terminate, amend, modify or waive any standstill provision
of any  confidentiality  or standstill  agreement  between the Company and other
parties  entered  into prior to the date hereof in  connection  with the process
conducted by the Company to solicit acquisition proposals for the Company.

         Section 5.5 Disclosure of Certain Matters; Delivery of Certain Filings.
The Company shall promptly  advise Parent orally and in writing if there occurs,
to the  knowledge  of the  Company,  any  change or event  which  results in the
executive officers of the Company having a good faith belief that such change or
event has resulted in or is  reasonably  likely to result in a Material  Adverse
Effect on the Company or prevent or  materially  delay the  consummation  of the
Reorganization.  Parent shall promptly  advise the Company orally and in writing
if there occurs,  to the knowledge of Parent,  any change or event which results
in the executive  officers of Parent having a good faith belief that such change
or event has resulted in or is reasonably likely to result in a Material Adverse
Effect on Parent.  The Company shall provide to Parent, and Parent shall provide
to the Company, copies of all filings made by the Company or Parent, as the case
may be, with any  Governmental  Entity in connection with this Agreement and the
transactions contemplated hereby.

         Section  5.6 Tax  Status.  During  the  period  from  the  date of this
Agreement  through the  Effective  Time,  each of Parent,  the Company and their
respective Affiliates

                                      -36-

<PAGE>



shall use its  reasonable  best  efforts (i) to cause each of the Merger and the
VoiceStream Merger to qualify as a reorganization  within the meaning of Section
368(a) of the Code and/or as part of a transaction  described in Section  351(a)
of the Code and (ii) to obtain the  opinions  of counsel  referred to in Section
7.2(b) and Section  7.3(b),  including  the  execution  of the tax  certificates
referenced therein.


                       Article VI - Additional Agreements

         Section 6.1  Employee  Benefits.  (a) Parent  shall take all  necessary
action so that each  person  who is an  employee  of the  Company  or any of its
Subsidiaries  as of the  Effective  Time  (including  each such person who is on
vacation,  temporary layoff,  approved leave of absence, sick leave or short- or
long-term  disability) (a "Retained  Employee")  shall remain an employee of the
Company or the  Surviving  Corporation  or a Subsidiary of the Company or of the
Surviving  Corporation,  as the case may be, immediately following the Effective
Time. If any person who (a) is receiving,  as of the Effective  Time,  long-term
disability  benefits and (b) was  employed by Aerial or any of its  Subsidiaries
immediately  before becoming eligible to receive long-term  disability  benefits
ceases  to be  totally  and  permanently  disabled  and is  able  to  return  to
employment,  Parent  shall  take all  necessary  action so that,  to the  extent
required by law, such person becomes an employee of the Company or the Surviving
Corporation or a Subsidiary of the Company or of the Surviving  Corporation,  as
the case may be. Prior to the  Effective  Time,  TDS and the Company shall enter
into an Employee Benefit Plans Separation Agreement whereby certain TDS employee
benefit plans in which the Company  participates  shall be spun-off to allow the
Company to become the sole  sponsor.  The terms of the  Employee  Benefit  Plans
Separation Agreement shall provide, inter alia, for the termination (without the
establishment  of any  similar  plan)  of  the  Company's  participation  in the
Telephone and Data Systems,  Inc. Wireless Companies' Pension Plan and Telephone
and Data Systems, Inc. Supplemental  Executive Retirement Plan. Parent shall not
be subject to any liability with respect to the Telephone and Data Systems, Inc.
Wireless Companies' Pension Plan. Parent shall take all necessary action so that
each employee  benefit plan maintained by the Company or any of its Subsidiaries
immediately before the Effective Time shall be continued  immediately  following
the Effective Time.  Parent shall take all necessary action so that,  throughout
the period beginning at the Effective Time and ending on September 30, 2000, the
Company, the Surviving  Corporation and their Subsidiaries will provide for each
Retained  Employee and former  employee of the Company and its  Subsidiaries,  a
level of employee  benefits and  aggregate  compensation  that is  substantially
comparable in the aggregate with that provided by the Company  immediately prior
to the  Effective  Time.  Parent  shall take all  necessary  action so that each
Retained  Employee  shall after the Effective  Time continue to be credited with
the unused  vacation  and sick  leave  credited  to such  employee  through  the
Effective  Time under the  applicable  vacation  and sick leave  policies of the
Company and its Subsidiaries,  and Parent shall permit or cause the Company, the
Surviving  Corporation  and their  Subsidiaries  to permit such employees to use
such vacation and sick leave.

                                      -37-

<PAGE>



Parent shall take all  necessary  action so that,  for all  purposes  under each
employee  benefit plan maintained by Parent or any of its  Subsidiaries in which
employees  or  former  employees  of the  Company  and its  Subsidiaries  become
eligible to participate upon or after the Effective Time, each such person shall
be given  credit for all service with the Company and its  Subsidiaries  (or all
service  credited by the Company or its  Subsidiaries)  to the same extent as if
rendered to Parent or any of its  Subsidiaries.  As of the Effective  Time,  the
Company  will have no Company  Benefit  Plans except for those  Company  Benefit
Plans listed in Items 3.12(a) and 3.12(b) of the Company Letter.  Item 6.1(a) of
the Company Letter  contains a true and complete list of each director,  officer
and  employee of the  Company and its  Subsidiaries  holding  options  under any
Company Benefit Plan, and the dollar or share amounts thereof.

                  (b) Except as otherwise provided in this Section or in Section
6.2, nothing in this Agreement shall be interpreted as limiting the power of the
Surviving  Corporation to amend or terminate any particular Company Benefit Plan
or any other particular employee benefit plan,  program,  agreement or policy or
as  requiring  the  Surviving  Corporation  to offer to continue  (other than as
required  by its terms) any  written  employment  contract  or to  continue  the
employment of any specific person,  provided,  however, that no such termination
or amendment may take away benefits or any other payments  already accrued as of
the time of such  termination  or amendment  without the consent of such person,
except as allowed by law.

                  (c) As of the  Effective  Time and  subject to the  applicable
time limitations  contained herein, Parent shall honor or cause to be honored by
the Company,  the Surviving  Corporation and their  Subsidiaries  all employment
agreements,   bonus  agreements,   severance   agreements  and   non-competition
agreements  with the persons who are  directors,  officers and  employees of the
Company and its Subsidiaries.

                  (d)  Without   limitation   of   Parent's  or  the   Company's
obligations under any existing employment agreement, bonus agreement,  severance
agreement or non-competition  agreement,  Parent shall maintain,  or shall cause
the Company and the  Surviving  Corporation  to maintain,  the  Company's  bonus
programs  through  at least  September  30 of the  calendar  year in  which  the
Reorganization is consummated, with bonuses to be paid to each Retained Employee
still employed at such time participating  thereunder at the greater of (A) such
employee's  target level and (B) the bonus such employee would have earned under
the applicable  Company bonus program if the  transactions  contemplated by this
Agreement  had not  occurred,  in all  events  on a basis  consistent  with past
practice,  and in  either  case  prorated  on the  basis of the  portion  of the
calendar  year  elapsed  as of the time of  termination  of the  relevant  bonus
program.

                  (e) Parent shall, or shall cause the Company and the Surviving
Corporation  to,  (A)  waive  all  limitations  as  to  preexisting  conditions,
exclusions  and waiting  periods  with  respect to  participation  and  coverage
requirements  applicable to the Retained  Employees and former  employees of the
Company and its Subsidiaries

                                      -38-

<PAGE>



under any  welfare or fringe  benefit  plan in which such  employees  and former
employees may be eligible to participate  after the Effective  Time,  other than
limitations or waiting periods that are in effect with respect to such employees
and that have not been  satisfied  under  the  corresponding  welfare  or fringe
benefit plan  maintained  by the Company for the Retained  Employees  and former
employees  prior to the Effective  Time, and (B) provide each Retained  Employee
and former  employee  with credit under any welfare plans in which such employee
or former employee becomes eligible to participate  after the Effective Time for
any  co-payments  and  deductibles  paid by such  Retained  Employee  or  former
employee for the then current plan year under the  corresponding  welfare  plans
maintained by the Company prior to the Effective Time.

         Section  6.2  Options;  Restricted  Stock  Awards.  (a)  Prior  to  the
Effective  Time,  the Board of  Directors  of the Company  (or the Stock  Option
Compensation  Committee of the Board of Directors)  shall adopt such resolutions
or shall take such other  actions as may be  required,  with  respect to Company
Stock Options and Company  Restricted  Stock Units, to specifically  approve the
transactions  contemplated by this Section 6.2. The Company shall use reasonable
efforts to obtain any  necessary  consents of the holders of such Company  Stock
Options and Company Restricted Stock Units to effect this Section 6.2.

         (b)  At  the  Effective  Time,  each  Company  Stock  Option  which  is
outstanding  immediately  prior to the  Effective  Time  pursuant to any Company
Stock Plan shall become and represent an option to purchase the number of shares
of Parent Common Stock (a "Substitute  Option")  determined by  multiplying  the
number of Company Common Shares subject to such Company Stock Option immediately
prior to the Effective Time by the Conversion  Number,  at an exercise price per
share of Parent Common Stock  (increased to the nearest whole cent) equal to the
exercise  price per Company  Common Share  subject to such Company  Stock Option
immediately  prior to the Effective Time divided by the Conversion  Number.  All
other terms and conditions  applicable to the Company Stock  Options,  including
vesting,  shall remain  unchanged  with respect to the  Substitute  Options.  No
fractional  shares of Parent  Common  Stock will be issued upon the  exercise of
Substitute Options. In lieu of such issuance,  the shares of Parent Common Stock
issued  pursuant to the terms of this Agreement  shall be rounded to the closest
whole  share of  Parent  Common  Stock.  After  the  Effective  Time,  except as
otherwise  provided  in this  Section  6.2,  each  Substitute  Option  shall  be
exercisable upon the same terms and conditions as were applicable to the related
Company  Stock Option  immediately  prior to the  Effective  Time,  after giving
effect to the resolutions  and other actions  described in this Section 6.2. Not
later  than  ten  days  following  the  Effective  Time,  Parent  shall  file  a
registration  statement  on  Form  S-8  or  otherwise  included  in an  existing
registration  statement  with respect to the shares of Parent Common Stock to be
issued upon exercise of the Substitute Options and shall use its best efforts to
maintain the  effectiveness  of such  registration  statement for so long as the
Substitute Options shall remain outstanding.

         (c) Pursuant to the Company Restricted Stock Plan, as of the date of

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<PAGE>



approval by the  stockholders  of the Company of this  Agreement,  each  Company
Restricted  Stock Unit shall  become  fully  vested and each holder of a Company
Restricted Stock Unit shall be entitled to receive from the Company a payment in
an amount  equal to the Fair Market  Value (as defined by the  Restricted  Stock
Unit Plan) of such  Restricted  Stock Unit determined on such vesting date. Such
payment  shall be made in cash or Company  Common  Shares,  as determined in the
sole discretion of the Chairman of the Company.

         Section 6.3 Company Stockholders  Meeting. (a) The Company shall call a
meeting of the  holders  of Company  Common  Stock  (the  "Company  Stockholders
Meeting") to be held as promptly as  practicable  for the purpose of voting upon
the  Reorganization.  Except as provided  below,  the Board of Directors of each
party  shall  recommend   approval  and  adoption  of  this  Agreement  and  the
transactions  contemplated hereby by its respective  stockholders and Parent and
the  Company  shall  each take all  lawful  action  to  solicit  such  approval,
including  timely  mailing  of the  Proxy  Statement/Prospectus.  The  Board  of
Directors of the Company  shall be permitted to withdraw,  or modify in a manner
adverse to Parent, its  recommendation to its stockholders,  but only if (i) the
Board of Directors of the Company  determines  in good faith by majority vote of
all directors  entitled to vote on the approval of this Agreement,  on the basis
of the  advice  of the  Company's  outside  counsel  that it is  required  under
Delaware  law to take such action in order for the Board of  Directors to comply
with its fiduciary duties under applicable  Delaware Law, (ii) the Company shall
have  delivered to Parent three  Business  Days' prior written  notice  advising
Parent that it intends to take such action and the Company's  Board of Directors
has  considered  any proposed  changes to this  Agreement  (if any)  proposed by
Parent and (iii) the Company has fully and completely  complied with Section 5.3
and this Section.  Unless this Agreement is previously  terminated in accordance
with Section 8.1, the Company shall submit this Agreement to its stockholders at
the meeting required to be called and held pursuant to this Section 6.3(a), even
if the Company's Board of Directors determines at any time after the date hereof
that it is no longer advisable or recommends that its stockholders reject it.

         (b)  Parent  shall  call a meeting  of its  stockholders  (the  "Parent
Stockholder  Meeting" and, together with the Company  Stockholder  Meeting,  the
"Stockholder  Meetings"),  to be held as promptly as practicable for the purpose
of voting upon the  Reorganization  and Parent Share Issuance.  Unless waived by
the Company,  Parent shall use its  reasonable  commercial  efforts to cause the
Parent Stockholder  Meeting to be coordinated with and held at the same time and
place as the vote of the Parent Stockholders,  as defined below, with respect to
the Omnipoint Agreement. Parent shall, though its Board of Directors,  recommend
to the holders of Parent Common Stock approval of the  Reorganization and Parent
Share  Issuance.  Unless this  Agreement is previously  terminated in accordance
with  Section  8.1,  Parent  shall  submit the  Reorganization  and Parent Share
Issuance  to its  stockholders  at the  meeting  required  to be called and held
pursuant to this Section 6.3(a), even if Parent's Board of Directors  determines
at any time after the date hereof that it is no longer advisable or

                                      -40-

<PAGE>



recommends that its stockholders reject it.

         (c) The Company and Parent shall  coordinate and cooperate with respect
to the  timing of the  Stockholder  Meetings  and  shall  use  their  reasonable
commercial  efforts to hold such meetings on the same day.  Parent shall use its
reasonable  best  efforts  to cause the record  date for the Parent  Stockholder
Meeting to be set as of a date  prior to the  consummation  of the  transactions
contemplated by the Omnipoint Agreement.

         Section 6.4 Preparation of the  Registration  Statement and Joint Proxy
Statement.  The Company and Parent shall promptly  prepare and file with the SEC
the Joint Proxy  Statement  and Parent  shall  prepare and file with the SEC the
Registration Statement, in which the Joint Proxy Statement will be included as a
prospectus. Unless waived by the Company, the Company and Parent shall use their
reasonable  commercial efforts to cause the Joint Proxy Statement to be combined
with the proxy  statement  of Parent and  Omnipoint  relating  to the  Omnipoint
Agreement.  Each of the Company and Parent shall use its  reasonable  efforts to
have the Registration  Statement  declared effective under the Securities Act as
promptly as practicable after such filing. Parent shall also take any reasonable
action (other than qualifying to do business in any  jurisdiction in which it is
now not so qualified) required to be taken under any applicable state securities
laws in connection  with the issuance of Parent Common Stock in connection  with
the Reorganization and upon any exercise of the Substitute Options.  The Company
shall furnish all  information  concerning the Company and the holders of shares
of Company  Common Stock as may be reasonably  requested by Parent in connection
with any such action. Parent shall notify the Company promptly of the receipt of
any  comments  from the SEC or its  staff and of any  request  by the SEC or its
staff for amendments or supplements to the  Registration  Statement or the Joint
Proxy  Statement or for additional  information and will supply the Company with
copies of all correspondence  between Parent or any of its  representatives,  on
the one hand, and the SEC or its staff,  on the other hand,  with respect to the
Registration Statement,  the Joint Proxy Statement or the Reorganization.  If at
any time prior to the Company  Stockholders  Meeting there shall occur any event
that  should be set forth in an  amendment  or  supplement  to the  Registration
Statement  or the Joint Proxy  Statement,  each of Parent and the Company  shall
promptly  prepare and mail to the stockholders of the Company and Parent such an
amendment  or  supplement.  Parent  and  the  Company  shall  cooperate  in  the
preparation  of the  Registration  Statement,  the Joint Proxy  Statement or any
amendment or supplement thereto.

         Section  6.5 Comfort  Letters.  (a) The  Company  shall use  reasonable
efforts to cause to be delivered to Parent "comfort"  letters of Arthur Andersen
LLP, the Company's  independent public accountants,  dated the date on which the
Registration  Statement shall become effective and as of the Effective Time, and
addressed  to  Parent  and  the  Company,  in  form  and  substance   reasonably
satisfactory to Parent and as is reasonably customary in scope and substance for
letters  delivered  by  independent   public   accountants  in  connection  with
transactions such as those contemplated by this

                                      -41-

<PAGE>



Agreement.

         (b) Parent shall use reasonable efforts to cause to be delivered to the
Company "comfort" letters of Arthur Andersen LLP,  Parent's  independent  public
accountants,  dated the date on which the  Registration  Statement  shall become
effective and as of the Effective Time, and addressed to the Company and Parent,
in  form  and  substance  reasonably  satisfactory  to  the  Company  and  as is
reasonably customary in scope and substance for letters delivered by independent
public accountants in connection with transactions such as those contemplated by
this Agreement.

         Section 6.6 Access to Information.  Upon reasonable  notice and subject
to restrictions contained in confidentiality  agreements to which the Company is
subject  and  subject  to  the  terms  of  the  Reciprocal   Non-Disclosure  and
Confidentiality  Agreement dated December 28, 1998, between Series A Stockholder
on behalf of itself and its Affiliates,  including the Company,  and Parent,  as
the  same  may  be  amended,  supplemented  or  modified  (the  "Confidentiality
Agreement"), (a) the Company shall, and shall cause each of its Subsidiaries to,
afford to Parent and to the officers, employees,  accountants, counsel and other
representatives  of Parent all reasonable  access,  during normal business hours
during the period prior to the Effective Time, to all their respective  lenders,
agents  and  other  representatives,   properties,   assets,  books,  contracts,
commitments  and records and,  during such period,  the Company shall (and shall
cause each of its  subsidiaries  to) furnish  promptly to Parent all information
concerning  its  business,  properties  and  personnel as Parent may  reasonably
request,  including a copy of each report, schedule,  registration statement and
other  document  filed or  received  by it during  such  period  pursuant to the
requirements of the federal or state securities laws or the federal Tax laws and
(b) Parent  shall,  and shall cause each of its  Subsidiaries  to, afford to the
Company  and  to  the  officers,  employees,   accountants,  counsel  and  other
representatives  of the Company all reasonable  access,  during normal  business
hours during the period prior to the  Effective  Time,  to all their  respective
properties,  books, contracts,  commitments and records and, during such period,
Parent shall (and shall cause each of its  Subsidiaries  to) furnish promptly to
the Company all information concerning its business, properties and personnel as
the Company may reasonably request,  including a copy of each report,  schedule,
registration  statement and other  document  filed or received by it during such
period pursuant to the  requirements of the federal or state  securities laws or
the federal Tax laws.

         Section  6.7  Compliance  with the  Securities  Act.  (a) No later than
thirty days following the date of this Agreement,  the Company shall cause to be
prepared and delivered to Parent a list identifying all persons who, at the time
of the Company  Stockholders  Meeting, may be deemed to be an "affiliate" of the
Company,  as such term is used in  paragraphs  (c) and (d) of Rule 145 under the
Securities  Act (the "Rule 145  Affiliates").  The Company shall use  reasonable
efforts to cause each person who is  identified  as a Rule 145 Affiliate in such
list (except Series A Stockholder and Investor) to deliver to Parent on or prior
to the Effective Time a written agreement, in a

                                      -42-

<PAGE>



form to be approved by the parties  hereto,  that such Rule 145 Affiliate  shall
not sell,  pledge,  transfer or otherwise dispose of any shares of Parent Common
Stock issued to such Rule 145 Affiliate in connection  with the  Reorganization,
except  pursuant to an effective  registration  statement or in compliance  with
such Rule 145 or another  exemption from the  registration  requirements  of the
Securities Act.

         (b) Prior to the Effective  Time,  the Board of Directors of Parent (or
the committee of the Board of Directors of Parent composed solely of two or more
"Non- Employee  Directors," as that term is defined in Rule 16b-3(b)(3)(i) under
the  Exchange  Act,  administering  the stock plans of Parent)  shall adopt such
resolutions  or shall take such other  actions as are  required to  specifically
approve the  acquisitions  of Parent Common Stock and Substitute  Options at the
Effective  Time,  as  contemplated  by Sections  2.1(c) and 6.2,  by  directors,
officers or  employees  of the Company who may become  directors  or officers of
Parent,   such  approvals  to  be  given  for  the  purpose  of  exempting  such
acquisitions under Rule 16b-3 under the Exchange Act, it being acknowledged that
such approvals  shall not adversely  affect  Parent's  ability  subsequently  to
determine  that any such  person has not in fact become a director or officer of
Parent.

         Section  6.8 Stock  Exchange  Listings.  Parent  shall  use  reasonable
efforts to be included on Nasdaq,  upon notification of issuance,  the shares of
Parent Common Stock to be issued in connection with the  Reorganization and upon
any exercise of the Substitute Options.

         Section 6.9 Fees and  Expenses.  (a) Except as  provided  below in this
Section   6.9,  all  fees  and  expenses   incurred  in   connection   with  the
Reorganization, this Agreement and the transactions contemplated hereby shall be
paid  by the  party  incurring  such  fees  or  expenses,  whether  or  not  the
Reorganization is consummated.

         (b) In the event that  Parent  terminates  this  Agreement  pursuant to
Section 8.1(c)(i) or Section 8.1(e), the Company shall pay, or cause to be paid,
in same day funds to Parent within five (5) Business  Days of such  termination,
$40,000,000 (the "Termination Fee").

         Section 6.10 Public Announcements.  Parent and the Company will consult
with each other before issuing any press release or otherwise  making any public
statements with respect to the  transactions  contemplated by this Agreement and
shall not issue any such press release or make any such public  statement  prior
to such  consultation,  except as may be required by applicable  law,  fiduciary
duties or by  obligations  pursuant to any listing  agreement  with any national
securities exchange.

         Section 6.11 Real Estate  Transfer  Tax.  Parent and the Company  agree
that either the Surviving  Corporation or the Company  (without any liability to
any of the  Company's  stockholders)  will pay any  state or local  Tax which is
attributable to the transfer of the beneficial ownership of the Company's or its
Subsidiaries' real property,

                                      -43-

<PAGE>



if any (collectively,  the "Transfer Taxes"), and any penalties or interest with
respect to the Transfer Taxes,  payable in connection  with the  consummation of
the Reorganization. The Company agrees to cooperate with Parent in the filing of
any returns with respect to the Transfer Taxes,  including supplying in a timely
manner a complete  list of all real property  interests  held by the Company and
its  Subsidiaries  and any  information  with respect to such  property  that is
reasonably  necessary to complete such returns. The portion of the consideration
allocable  to the real  property of the Company  and its  Subsidiaries  shall be
determined by Parent in its reasonable  discretion.  To the extent  permitted by
law, the  Company's  stockholders  shall be deemed to have agreed to be bound by
the allocation  established  pursuant to this Section 6.11 in the preparation of
any return with respect to the Transfer Taxes.

         Section 6.12 State Takeover Laws. If any "fair price" or "control share
acquisition"  statute  or other  similar  statute  or  regulation  shall  become
applicable to the transactions  contemplated hereby,  Parent and the Company and
their respective Boards of Directors shall use reasonable  efforts to grant such
approvals  and take  such  actions  as are  necessary  so that the  transactions
contemplated  hereby may be  consummated as promptly as practicable on the terms
contemplated  hereby  and  otherwise  act to  minimize  the  effects of any such
statute or regulation on the transactions contemplated hereby.

         Section 6.13  Indemnification;  Directors and Officers  Insurance.  (a)
Parent shall,  or shall cause the Surviving  Company to, continue to provide all
rights to  indemnification  or  exculpation,  existing  in favor of a  director,
officer,  employee or agent (an  "Indemnified  Person") of the Company or any of
its Subsidiaries (including,  without limitation, rights relating to advancement
of  expenses  and  indemnification  rights to which such  persons  are  entitled
because  they are serving as a director,  officer,  agent or employee of another
entity at the request of the Company or any of its Subsidiaries), as provided in
the Restated  Certificate of  Incorporation  of the Company,  the By-laws of the
Company or any indemnification agreement, in each case, as in effect on the date
of this Agreement, and relating to actions or events through the Effective Time,
and such rights to  indemnification  shall survive the  Reorganization and shall
continue in full force and  effect,  without any  amendment  thereto;  provided,
however,  that neither Parent nor the Surviving Corporation shall be required to
indemnify any  Indemnified  Person in connection with any proceeding (or portion
thereof) to the extent involving any claim initiated by such Indemnified  Person
unless the initiation of such proceeding (or portion  thereof) was authorized by
the Board of Directors of the Company or unless such proceeding is brought by an
Indemnified  Person to enforce rights under this Section 6.13;  provided further
that  any  determination  required  to  be  made  with  respect  to  whether  an
Indemnified  Person's  conduct  complies  with the standards set forth under the
DGCL, the Restated  Certificate of Incorporation of the Company,  the By-laws of
the  Company  or any  such  agreement,  as the  case  may be,  shall  be made by
independent  legal counsel selected by Parent and reasonably  acceptable to such
Indemnified Person; and provided further that nothing in this Section 6.13 shall
impair any rights of any Indemnified Person.  Without limiting the generality of
the preceding sentence, in

                                      -44-

<PAGE>



the  event  that any  Indemnified  Person  becomes  involved  in any  actual  or
threatened action, suit, claim,  proceeding or investigation after the Effective
Time  relating to actions prior to the Effective  Time,  Parent shall,  or shall
cause the Surviving  Corporation to, promptly advance to such Indemnified Person
his or her legal and other expenses (including the cost of any investigation and
preparation incurred in connection therewith),  subject to the providing by such
Indemnified Person of an undertaking to reimburse all amounts so advanced in the
event of a  non-appealable  determination  of a court of competent  jurisdiction
that such Indemnified Person is not entitled thereto.

         (b) Subject to the prior written approval by Parent, which shall not be
unreasonably  withheld,  prior to the Effective Time, the Company shall have the
right to obtain and pay for in full a "tail"  coverage  directors' and officers'
liability insurance policy ("D&O Insurance")  covering a period of not more than
six years  after the  Effective  Time and  providing  coverage in amounts and on
terms  consistent  with the Company's  existing D&O Insurance.  In the event the
Company  does not  obtain  such  insurance,  Parent  shall  cause the  Surviving
Corporation  to continue to provide D&O Insurance  relating to actions or events
through the  Effective  Time (through  Series A Stockholder  or directly with an
insurance carrier),  for a period of not more than six years after the Effective
Time; provided,  that the Surviving Corporation may substitute therefor policies
of  substantially   similar  coverage  and  amounts  containing  terms  no  less
advantageous to such former directors or officers;  provided further that if the
existing D&O Insurance expires or is cancelled during such period, Parent or the
Surviving  Corporation  shall  make  reasonable  commercial  efforts  to  obtain
substantially similar D&O Insurance; and provided further that the Company shall
not be  required  to  expend,  in order to  maintain  or  procure  an annual D&O
Insurance  policy,  an amount in excess of 200% of the last annual  premium paid
prior to the date hereof,  but in such case shall  purchase as much  coverage as
possible for such amount.

         (c) The  provisions  of this  Section  6.13 are  intended to be for the
benefit of, and shall be enforceable  by, each  Indemnified  Person,  his or her
heirs and his or her  personal  representatives  and shall be  binding  upon the
successors and assigns of Parent, the Company and the Surviving Company.

         Section 6.14 Best Efforts.  (a) Subject to the provisions hereof,  each
of the Company, Parent and Merger Sub C agrees to use best efforts to consummate
and  make  effective,   in  the  most  expeditious   manner   practicable,   the
Reorganization  and the  other  transactions  contemplated  by  this  Agreement;
provided,  however,  that neither  Parent nor any of its  Subsidiaries  shall be
required,  nor,  without  the  consent  of  Parent,  shall  the  Company  or its
Subsidiaries  be  permitted,  to divest or hold  separate or  otherwise  take or
commit to take any action that limits its freedom of action with  respect to the
Company,  Parent or any of their  Subsidiaries  or any  material  portion of the
assets  of  the  Company,  Parent  or any of  their  Subsidiaries  or any of the
business,  product  lines,  or  assets  of the  Company,  Parent or any of their
Subsidiaries.  Without limiting the foregoing,  (i) each of the Company,  Parent
and Merger Sub C agrees to use best efforts to take,  or cause to be taken,  all
actions necessary to comply promptly with

                                      -45-

<PAGE>



all legal  requirements  that may be  imposed  on  itself  with  respect  to the
Reorganization  (which actions shall include furnishing all information required
under the HSR Act and all actions  required in connection  with  approvals of or
filings with the FCC,  state public  utility or service  commissions  or similar
agencies and any other  Governmental  Entity) and shall promptly  cooperate with
and furnish  information to each other in connection with any such  requirements
imposed upon any of them or any of their  Subsidiaries  in  connection  with the
Reorganization and (ii) each of the Company,  Parent and Merger Sub C shall, and
shall cause its Subsidiaries to, use best efforts to obtain (and shall cooperate
with each other in obtaining) any consent, authorization,  order or approval of,
or any exemption by, the FCC,  state public  utility or service  commissions  or
similar  agencies and any other  Governmental  Entity or other public or private
third party  required to be obtained or made by Parent,  Sub, the Company or any
of their Subsidiaries in connection with the Reorganization or the taking of any
action contemplated  thereby or by this Agreement.  Notwithstanding  anything to
the  contrary  contained in this  Agreement,  in  connection  with any filing or
submission  required or action to be taken by Parent,  the Company or any of its
respective   Subsidiaries  to  consummate  the   Reorganization   or  the  other
transactions  contemplated  in this  Agreement,  the Company shall not,  without
Parent's  prior  written  consent,  commit  to  any  divestiture  of  assets  or
businesses of the Company and its  Subsidiaries  if such divested  assets and/or
businesses  are material to the assets or  profitability  of the Company and its
Subsidiaries taken as a whole.

         (b) As promptly as practicable after the execution and delivery of this
Agreement, Parent and the Company shall prepare all appropriate applications for
FCC approval,  and such other documents as may be required,  with respect to the
transfer of control of the Company and Parent to Holding Company  (collectively,
the "FCC  Applications").  Not  later  than the  tenth  Business  Day  following
execution and delivery of this  Agreement,  the Company and Parent will exchange
with each other their respective completed portions of the FCC Applications. Not
later than the  fifteenth  Business Day  following the execution and delivery of
this Agreement, the Company and Parent shall file, or cause to be filed, the FCC
Applications.  If the  Effective  Time  shall not have  occurred  for any reason
within any applicable initial  consummation  period, and neither the Company nor
Parent shall have terminated this Agreement  pursuant to Section 8.1, Parent and
the Company shall  jointly  request one or more  extensions of the  consummation
period of such grant. No party hereto shall knowingly take, or fail to take, any
action if the intent or  reasonably  anticipated  consequence  of such action or
failure  to act is, or would be, to cause the FCC not to grant  approval  of the
FCC  Applications  or delay  either  such  approval or the  consummation  of the
transfer  of  control of the  Company.  Parent  and the  Company  shall each pay
one-half (1/2) of any FCC fees, if applicable,  in connection with the filing or
granting  of approval  of the FCC  Applications.  Each of Parent and the Company
shall bear its own expenses in connection  with the  preparation and prosecution
of the FCC Applications.  Parent and the Company shall each use all commercially
reasonable  efforts to prosecute the FCC Applications in good faith and with due
diligence  before the FCC and in connection  therewith shall take such action or
actions as may be necessary or reasonably required

                                      -46-

<PAGE>



in connection  with the FCC  Applications,  including  furnishing to the FCC any
documents,  materials  or  other  information  requested  by the FCC in order to
obtain such FCC approval as expeditiously as practicable.

         (c) Promptly  after the date hereof,  Parent and the Company (as may be
required  pursuant to the HSR Act) will  complete all  documents  required to be
filed with the Federal Trade  Commission  and the Department of Justice in order
to comply with the HSR Act and,  not later than 20 Business  Days after the date
hereof,  together  with the  Persons who are  required to join in such  filings,
shall file the same with the appropriate  Governmental Entities.  Parent and the
Company  shall  each  pay  one-half  (1/2) of any fees  that may be  payable  in
connection with the filing pursuant to the HSR Act. Parent and the Company shall
promptly  furnish all materials  thereafter  required by any of the Governmental
Entities having  jurisdiction  over such filings.  and shall take all reasonable
actions and shall file and use all reasonable efforts to have declared effective
or approved all documents and notifications with any such Governmental Entities,
as may be required  under the HSR Act or other  federal  antitrust  laws for the
consummation of the Transactions and any other transactions contemplated hereby.

         (d) Each of the Company and Parent shall promptly notify the other of:

                  (i) any notice or other communication from any Person alleging
         that the consent of such  Person is or may be  required  in  connection
         with the transactions contemplated by this Agreement;

                  (ii) any notice or other  communication  from any Governmental
         Entity  in  connection  with  the  transactions  contemplated  by  this
         Agreement;

                  (iii)  the  occurrence,  or  non-occurrence,  of any event the
         occurrence or  non-occurrence  of which would be reasonably be expected
         to cause any representation or warranty made by it and contained herein
         to be untrue or inaccurate  in any material  respect at any time during
         the period  commencing  on the date hereof and ending at the  Effective
         Time;

                  (iv) any  failure of such party to comply  with or satisfy any
         covenant, condition or agreement to be complied with or satisfied by it
         hereunder;  provided, however, that the delivery of any notice pursuant
         to this  Section  6.14(d)  shall  not  limit or  otherwise  affect  the
         remedies available hereunder to the party receiving such notice;

                  (v) any actions, suits, claims,  investigations or proceedings
         commenced or, to its knowledge  threatened against such party which, if
         pending on the date of this Agreement, would have been required to have
         been disclosed pursuant to Section 3.13, in the case of the Company, or
         Section  4.12,  in  the  case  of  Parent,   or  which  relate  to  the
         consummation of the Transactions; and


                                      -47-

<PAGE>



                  (vi) any event, condition or state of facts which could have a
         Material Adverse Effect on such party.

         Section 6.15 Certain  Litigation.  The Company agrees that it shall not
settle any litigation commenced after the date hereof against the Company or any
of  its  directors  by  any   stockholder   of  the  Company   relating  to  the
Reorganization,  this Agreement or the Stockholder  Agreement  without the prior
written consent of Parent,  which consent shall not be unreasonably  withheld or
delayed.

         Section 6.16 Transition Services Agreement.  Parent, Company and Series
A Stockholder  shall enter into the  Transition  Services  Agreement in the form
attached hereto as Annex C on or prior to the Effective Time.

         Section  6.17  Registration  Rights  Agreement.  Parent  and  Series  A
Stockholder  shall  enter into the  Registration  Rights  Agreement  in the form
attached  hereto as Exhibit A to the  Stockholder  Agreement  on or prior to the
Effective Time.

         Section 6.18 Investor  Claim.  Matters  relating to the  investment and
claim by the Investor are set forth on Annex E hereto.

         Section 6.19  Intercompany  Service  Agreements.  Each of the following
agreements  ("Intercompany  Service  Agreements") and, except as provided in the
Transition Services Agreement or in this Agreement, all other agreements between
the Company and its Subsidiaries,  on the one hand, and Series A Stockholder and
its  Subsidiaries  (other than the Company  and its  Subsidiaries)  on the other
hand,  shall be terminated as of the Effective  Time and, as provided in Section
6.23, all amounts due from one party to another  thereunder  shall be settled in
cash on or prior to the Effective Time:

                           (i)        Cash Management Agreement;

                           (ii)       Insurance Cost Sharing Agreement;

                           (iii)      Intercompany Agreement;

                           (iv)       Exchange Agreement;

                           (v)        Employee Benefit Plan Agreement; and

                           (vi)       Company Registration Rights Agreement.

         Following  such  termination,  except  as  otherwise  provided  in this
Agreement  or the  Transition  Services  Agreement,  the  Company  and  Series A
Stockholder  shall  release each other with  respect to any Loss  relating to or
arising from the  foregoing  agreements  and all amounts due  thereunder  on and
after the Effective Time.

                                      -48-

<PAGE>



         Section 6.20 Revolving Credit Agreement. On the date of this Agreement,
the Company, Operating Company, Series A Stockholder and Parent shall enter into
the Debt/Equity Replacement Agreement attached hereto as Annex F.

         Section 6.21 Series A and B Notes.  Prior to the Effective Time, Parent
shall, with the assistance of the Company, acquire all of the Series A Notes and
Series B Notes.  Any  investment  banking firm engaged in  connection  with such
acquisition shall be selected by the Series A Stockholder subject to the consent
of Parent  (including such investment  banking firm's fees and expenses),  which
shall not be unreasonably withheld.  Unless otherwise determined pursuant to the
preceding  sentence,  the parties  hereto agree that Credit  Suisse First Boston
Corporation ("CSFB") shall be engaged to assist Parent in acquiring the Series A
Notes and Series B Notes.  Parent  shall bear the fees and expenses of acquiring
the  Series A Notes  and  Series  B Notes  (including  the  fees and  reasonable
expenses  of  counsel  and of CSFB or other  investment  banking  firm  selected
pursuant to this Section),  and shall be responsible  for and pay any make-whole
premium (the "Make-Whole  Premium"),  to the extent the amount of the Make-Whole
Premium is less than or equal to the difference  (the "Parent Cost") between the
Redemption  Present Value and accreted value of the Notes on the date such Notes
are  acquired.  The  Redemption  Present Value of the Notes shall be computed by
CSFB in accordance  with standard market  practice,  and shall equal the present
value  of the  redemption  price of such  Notes  corresponding  to the  earliest
Optional  Redemption Date, as defined in the Series A Indenture and the Series B
Indenture  (November  1, 2001 in the case of the Series A Notes and  February 1,
2003 in the case of the Series B Notes),  discounted  from such date to the date
of acquisition,  using a discount rate equal to a comparable  Treasury rate with
respect  to such  Note  plus 50  basis  points.  Series A  Stockholder  shall be
responsible for and shall pay the amount of any Make-Whole  Premium in excess of
the Parent Cost.  Following the  acquisition  of the Series A Notes and Series B
Notes, on or prior to the Effective Time, Series A Stockholder shall be released
and  discharged in full from the Series A Guaranty and the Series B Guaranty and
such guarantees shall be terminated.

         Section 6.22 Nokia Credit  Agreement.  At the  Effective  Time,  Parent
shall cause all obligations,  including accrued interest, under the Nokia Credit
Agreement  to be  repaid in full and the Nokia  Credit  Agreement  and the Nokia
Guaranty shall be  terminated,  or Parent shall obtain an amendment to the Nokia
Credit Agreement  (including the substitution of Parent as guarantor  thereunder
and the release and discharge in full of the Series A Stockholder's  obligations
under the  Nokia  Guaranty),  to  permit  the  Reorganization  to occur  without
resulting in a default under the Nokia Credit  Agreement.  Parent shall bear the
expense  of  refinancing  all  borrowings  under  the  Nokia  Credit  Agreement.
Following such action,  on or prior to the Effective Time,  Series A Stockholder
shall be released and discharged in full from the Nokia Guaranty.

         Section 6.23 Intercompany  Accounts. All intercompany accounts payable,
receivables,  loans,  including accrued interest and any penalties,  accrued but
unpaid guarantee fees and other intercompany accounts ("Intercompany  Accounts")
between

                                      -49-

<PAGE>



the Company and its Subsidiaries,  on the one hand, and Series A Stockholder and
its  Subsidiaries  (other than the Company and its  Subsidiaries),  on the other
hand,  including  amounts due from one party to another  under the  Intercompany
Service  Agreements,  shall  be  settled  and  paid in cash on or  prior  to the
Effective  Time.  To the extent  necessary  Parent  shall  advance  funds to the
Company on or prior to the  Effective  Time to permit the  Company to settle all
Intercompany  Accounts with Series A Stockholder.  The parties  acknowledge  and
agree that the preparation of financial statements and accounts will necessarily
require  the parties to estimate  the amounts of certain  Intercompany  Accounts
and,  accordingly,  except as  otherwise  provided  in the  Transition  Services
Agreement,  the parties agree that they will cooperate  after the Effective Time
to true-up such estimates  considering actual experience or information  learned
after the Effective  Time.  The parties  hereto agree to true-up and settle such
estimates in cash within 30 days after notice from the other party specifying in
reasonable detail the final amount of any such Intercompany  Account.  Following
such settlement,  the Company and Series A Stockholder  shall release each other
with  respect  to any Loss  relating  to or arising  from any such  intercompany
accounts on and after the Effective Time.

         Section 6.24 Tax Allocation Agreement and Tax Settlement Agreement. The
Tax Allocation  Agreement  shall  terminate as of the Effective Time and none of
the parties  thereto  shall have any  liability  to any other  party  thereunder
following the Effective Time. The Tax Settlement  Agreement shall remain in full
force and effect in accordance  with its terms following the Effective Time, and
the Company shall withdraw its  contention,  made in a letter dated June 8, 1999
from the Company to the Series A Stockholder,  that an error in the  application
of the federal income tax law was made in the tax  settlement  model referred to
in Section 2 of the Tax Settlement Agreement.

         Section 6.25 Parent  Stockholder  Voting Agreement.  Hellman & Friedman
Investors,  L.P., H & F Orchard  Partners,  L.P., H & F International  Partners,
L.P., John W. Stanton,  Theresa E. Gillespie,  PNCellular,  Inc., Stanton Family
Trust,  Stanton  Communications  Corporation,  GS Capital  Partners,  L.P.,  The
Goldman  Sachs Group,  Inc.,  Bridge Street Fund 1992,  L.P.,  Stone Street Fund
1992,  L.P.,  Providence  Media Partners,  L.P.,  Hutchinson  Telecommunications
Holdings  (USA)  Limited and  Hutchinson  Telecommunications  PCS (USA)  Limited
("Parent  Stockholders"),  who hold 46% of the fully diluted voting power of the
Parent Company Stock on the date hereof, shall enter into the Parent Stockholder
Voting  Agreement  with the  Company  in the  form  attached  hereto  as Annex G
pursuant  to which  such  stockholders  of  Parent  shall  agree to vote for the
Reorganization and Parent Share Issuance.

         Section 6.26  Agreements Regarding Taxes.

         (a) Series A Stockholder  Liability for Taxes. The Series A Stockholder
shall  be  liable  for  and  shall  indemnify  Parent  and the  Company  and its
Subsidiaries  for all Taxes  (including  any  obligation  to  contribute  to the
payment of a Tax  determined on a  consolidated,  combined or unitary basis with
respect to a group of corporations that

                                      -50-

<PAGE>



includes or included the Company or any of its  Subsidiaries and Taxes resulting
from the  Company  and its  Subsidiaries  ceasing to be a member of the Series A
Stockholder's  Group),  (i) imposed on the Series A  Stockholder's  Group or any
member  thereof  (other than the Company and its  Subsidiaries)  for any taxable
year,  (ii) imposed on the Company or any of its  Subsidiaries  or for which the
Company or any of its  Subsidiaries may otherwise be liable for any taxable year
or period  that ends on or before the date on which the  Effective  Time  occurs
(the "Effective Date"), and with respect to any taxable year or period beginning
before and ending  after the  Effective  Date,  the portion of such taxable year
ending on and including  the  Effective  Date, or (iii) imposed on Parent or the
Company or any of its  Subsidiaries  as a result of the  receipt of any  payment
made to it pursuant to the provisions of this Section 6.26.  Except as set forth
in Section 6.26(d),  the Series A Stockholder shall be entitled to any refund of
Taxes of the Company and its Subsidiaries received for such periods.

         (b)  Parent  Liability  for  Taxes.  Parent  shall  be  liable  for and
indemnify the Series A  Stockholder  for (i) the Taxes of the Company and any of
its  Subsidiaries for any taxable year or period that begins after the Effective
Date and, with respect to any taxable year or period beginning before and ending
after the Effective  Date, the portion of such taxable year beginning  after the
Effective Date and (ii) Taxes imposed on the Series A Stockholder as a result of
any payment made to it pursuant to the  provisions of this Section 6.26.  Parent
shall  be  entitled  to any  refund  of  Taxes  of the  Company  and  any of its
Subsidiaries received for such periods.

         (c) Taxes for Short  Taxable Year.  For purposes of paragraphs  (a) and
(b),  whenever it is  necessary  to  determine  the  liability  for Taxes of the
Company or any of its  Subsidiaries  for a portion  of a taxable  year or period
that begins before and ends after the Effective Date, the  determination  of the
Taxes of such  entity for the  portion of the year or period  ending on, and the
portion  of the year or period  beginning  after,  the  Effective  Date shall be
determined  by assuming that the entity had a taxable year or period which ended
at the close of the  Effective  Date,  except  that  exemptions,  allowances  or
deductions  that are  calculated on an annual  basis,  such as the deduction for
depreciation, shall be apportioned on a time basis.

         (d)  Refunds  from  Carrybacks.  If the  Series A  Stockholder  becomes
entitled  to a refund or credit of Taxes for any  period  for which it is liable
under Section 6.26(a) to indemnify Parent and such Taxes are attributable solely
to the  carryback  of losses,  credits or similar  items from a taxable  year or
period that begins after the Effective Date and  attributable  to the Company or
any of its  Subsidiaries,  the Series A Stockholder shall promptly pay to Parent
the amount of such refund or credit together with any interest  thereon.  In the
event  that any  refund or credit of Taxes for which a payment  has been made is
subsequently reduced or disallowed, Parent shall indemnify and hold harmless the
Series A Stockholder  for any Tax liability,  including  interest and penalties,
assessed  against  the  Series A  Stockholder  by  reason  of the  reduction  or
disallowance.

         (e) Tax  Returns.  The Series A  Stockholder  shall file or cause to be
filed

                                      -51-

<PAGE>



when due all Tax Returns  with respect to Taxes that are required to be filed by
or with respect to the Company and any of its  Subsidiaries for taxable years or
periods  ending on or before the  Effective  Date and shall pay any Taxes due in
respect of such Tax Returns, and Parent shall file or cause to be filed when due
all Tax Returns  with  respect to Taxes that are required to be filed by or with
respect to the Company and any of its  Subsidiaries for taxable years or periods
ending after the Effective Date and shall remit any Taxes due in respect of such
Tax Returns.  The Series A Stockholder  shall pay Parent the Taxes for which the
Series A Stockholder is liable pursuant to Section 6.26(a) but which are payable
with Tax Returns to be filed by Parent pursuant to the previous  sentence within
10 days prior to the due date for the filing of such Tax Returns.

         (f)  Contest  Provisions.  Parent  shall  promptly  notify the Series A
Stockholder  in writing upon  receipt by Parent,  any of its  Affiliates  or the
Company  or any of its  Subsidiaries  of notice  of any  pending  or  threatened
federal,  state,  local or foreign  income or franchise  tax audit or assessment
which may materially  affect the Taxes of the Company or any of its Subsidiaries
for which  the  Series A  Stockholder  would be  required  to  indemnify  Parent
pursuant to Section 6.26(a), provided that failure to comply with this provision
shall not  affect  Parent's  right to  indemnification  hereunder.  The Series A
Stockholder  shall  have  the  sole  right  to  represent  the  Company  and its
Subsidiaries'  interests in any tax audit or  administrative or court proceeding
relating  to taxable  periods  ending on or before the  Effective  Date,  and to
employ counsel of its choice at its expense.  Notwithstanding the foregoing, the
Series A Stockholder shall not be entitled to settle, either administratively or
after the commencement of litigation,  any claim for Taxes which would adversely
affect the  liability for Taxes of Parent or the Company or any of the Company's
Subsidiaries  for any period after the Effective  Date to any extent  (including
the imposition of income tax deficiencies,  the reduction of asset basis or cost
adjustments,  the lengthening of any amortization or depreciation  periods,  the
denial of amortization or depreciation  deductions,  or the reduction of loss or
credit carryforwards)  without the prior written consent of Parent. Such consent
shall not be  unreasonably  withheld,  and shall not be  necessary to the extent
that the Series A Stockholder has indemnified  Parent against the effects of any
such settlement.

         (g) Assistance  and  Cooperation.  After the Closing Date,  each of the
Series A Stockholder and Parent shall:

                  (i) assist (and cause their  respective  Affiliates to assist)
         the other  party in  preparing  any Tax  Returns or reports  which such
         other party is responsible  for preparing and filing in accordance with
         this Section 6.26;

                  (ii)  cooperate  fully in  preparing  for any  audits  of,  or
         disputes  with  taxing  authorities  regarding,  any Tax Returns of the
         Company or any of its Subsidiaries;

                  (iii)  make  available  to the other  party and to any  taxing
authority as

                                      -52-

<PAGE>



         reasonably  requested all information,  records, and documents relating
         to Taxes of the Company and its Subsidiaries;

                  (iv)  provide  timely  notice to the other in  writing  of any
         pending or threatened  tax audits or  assessments of the Company or any
         of its  Subsidiaries  for taxable periods for which the other party may
         have a liability under this Section 6.26; and

                  (v) furnish the other party with copies of all  correspondence
         received from any taxing  authority in connection with any tax audit or
         information request with respect to any such taxable period.

         (h) Payment. Any indemnity payment required to be made pursuant to this
Section  6.26 shall be paid  within 15 days after the  indemnified  party  makes
written  demand upon the  indemnifying  party,  but in no case earlier than five
Business  Days prior to the date on which the relevant  Taxes are required to be
paid to the relevant taxing authority (including estimated Tax payments).

         (i) Adjustment to Purchase  Price.  Parent and the Series A Stockholder
agree to report any  indemnification  payment  made by the Series A  Stockholder
under this Section 6.26 as an  adjustment  to purchase  price,  contribution  to
capital,  or other  non-taxable  amount to the extent that there is  substantial
authority for such reporting  position under applicable law, it being understood
that if such  reporting  position is disallowed in any  administrative  or court
proceeding,  the Series A  Stockholder  shall  indemnify  Parent  under  Section
6.26(a) for the effects of such disallowance.

         (j) Survival of  Obligations.  The obligations of the parties set forth
in this  Section  6.26 shall be  unconditional  and absolute and shall remain in
effect without limitation as to time.

                       Article VII - Conditions Precedent

         Section  7.1  Conditions  to Each  Party's  Obligation  to  Effect  the
Reorganization.  The  respective  obligations of each party hereto to effect the
Reorganization  shall be subject to the fulfillment at or prior to the Effective
Time of the following conditions:

         (a)  Stockholder  Approval.  The  Reorganization  shall  have been duly
approved by the requisite vote of the  stockholders of the Company in accordance
with applicable law and the Restated Certificate of Incorporation and By-laws of
the Company and the Parent Share  Issuance  shall have been duly approved by the
requisite vote of the  stockholders  of Parent in accordance with applicable law
and the Certificate of Incorporation and Bylaws of Parent.

         (b) No Injunction or Restraint. No statute, rule, regulation, executive
order, decree,  temporary restraining order, preliminary or permanent injunction
or other order

                                      -53-

<PAGE>



issued by any  court of  competent  jurisdiction  or other  Governmental  Entity
preventing the consummation of the  Reorganization  or which could reasonably be
expected to have a Material  Adverse  Effect on the Company  shall be in effect;
provided,  however,  that each of the parties shall have used their commercially
reasonable efforts to prevent the entry of any such temporary restraining order,
injunction or other order, including, without limitation,  taking such action as
is required to comply with Section  6.14,  and to appeal as promptly as possible
any injunction or other order that may be entered.

         (c) Stock Exchange Listings. The shares of Parent Common Stock issuable
in  accordance  with the  Reorganization  and pursuant to Section 6.2 shall have
been  authorized  for  listing  on the  Nasdaq,  subject to  official  notice of
issuance.

         (d) HSR. Any waiting  period (and any extension  thereof) under the HSR
Act applicable to the Reorganization shall have expired or been terminated.

         (e)  Registration  Statement.  The  Registration  Statement  shall have
become  effective in accordance  with the provisions of the  Securities  Act. No
stop order suspending the effectiveness of the Registration Statement shall have
been  issued by the SEC and no  proceedings  for that  purpose  shall  have been
initiated or, to the knowledge of Parent or the Company,  threatened by the SEC.
All  necessary  state  securities   authorizations   (including  state  takeover
approvals)  shall  have been  received  unless the  failure to receive  any such
authorization  would not have a Material Adverse Effect on the Company or Parent
or the transactions contemplated by this Agreement.

         (f) Governmental  Approvals.  All necessary  consents or authorizations
from  Governmental  Entities  which  may be  required  in  connection  with  the
transactions contemplated hereby, including but not limited to the FCC and state
public  utility or service  commissions  or  similar  agencies,  shall have been
received and, in the case of the FCC, shall have become Final Orders, unless the
failure to receive any such consent or  authorization  would not have a Material
Adverse Effect on the Company or Parent or the transactions contemplated by this
Agreement,  and such consents or authorizations shall not contain any conditions
which would  reasonably  be expected  to have a Material  Adverse  Effect on the
Company or Parent or the transactions contemplated by this Agreement.

         (g) Investor Agreement.  Parent and the Series A Stockholder shall have
executed and delivered the Investor Agreement attached hereto as Exhibit H.

         (h) Omnipoint Agreement. The transactions contemplated by the Omnipoint
Agreement  shall  have  been  consummated  or  terminated,  provided  that  this
condition  shall be deemed to have been  satisfied on the  Omnipoint End Date if
the  transactions  contemplated  by the Omnipoint  Agreement shall have not been
consummated or terminated by such date.

         (i) Public  Announcement.  In the event the Omnipoint  Agreement  shall
have

                                      -54-

<PAGE>



been  terminated  or the condition  specified in Section  7.1(h) shall have been
deemed to be satisfied  pursuant to the proviso  thereof,  twenty  business days
shall have elapsed following public announcement of such event.

         Section  7.2  Conditions  to  Obligation  of the  Company to Effect the
Reorganization. The obligation of the Company to effect the Reorganization shall
be subject to the fulfillment at or prior to the Effective Time of the following
additional conditions:

         (a) Performance of Obligations; Representations and Warranties. Each of
Parent and Merger Sub C shall have performed each of its agreements contained in
this Agreement  required to be performed at or prior to the Effective  Time, and
each of the  representations and warranties of Parent and Merger Sub C contained
in this Agreement  (disregarding  all  qualifications  and exceptions  contained
therein  relating to  materiality  or a Material  Adverse  Effect or any similar
standard or qualification)  shall be true and correct at and as of the Effective
Time  as if  made  at and as of the  Effective  Time  in  each  case  except  as
contemplated   or  permitted  by  this   Agreement  and  except  as  would  not,
individually  or in the  aggregate,  reasonably  be  expected to have a Material
Adverse Effect on the Company or Parent or the transactions contemplated by this
Agreement; and the Company shall have received a certificate signed on behalf of
Parent by its Chief Executive  Officer and its Chief  Financial  Officer to such
effect.

         (b) Tax Opinion. The Company shall have received an opinion of Sidley &
Austin, in form and substance reasonably  satisfactory to the Company, dated the
Effective  Time,  substantially  to the  effect  that,  on the  basis of  facts,
representations  and  assumptions set forth in such opinion which are consistent
with the state of facts  existing as of the Effective  Time,  for federal income
tax purposes:

                  (i) The Merger will constitute  either (A) a  "reorganization"
         within the meaning of Section 368(a) of the Code, to which the Company,
         Merger Sub C and  Parent  will each be a party,  within the  meaning of
         Section  368(b) of the Code or (B) part of a  transaction  described in
         Section 351(a) of the Code;

                  (ii) No gain or loss will be recognized by Parent,  Merger Sub
         C or the Company as a result of the Merger;

                  (iii) A  stockholder  of the  Company  that  does not elect to
         receive any cash pursuant to the Merger will  recognize no gain or loss
         solely as a result of the  conversion of shares of Company Common Stock
         into shares of Parent Common Stock pursuant to the Merger,  except with
         respect  to cash,  if any,  received  in lieu of  fractional  shares of
         Parent Common Stock;

                  (iv) A stockholder  of the Company that elects to receive cash
         pursuant to the Merger will  recognize any gain (but not loss) realized
         as a result of the  Merger in an amount  equal to the lesser of (A) the
         difference between (x) the fair

                                      -55-

<PAGE>



         market  value of Parent  Common Stock  received  pursuant to the Merger
         plus cash  received  pursuant  to the  Merger and (y) the basis of such
         stockholder's Company Common Stock surrendered in the Merger or (B) the
         amount of cash received pursuant to the election to receive cash;

                  (v) The  aggregate  tax basis of the  shares of Parent  Common
         Stock  received in exchange for shares of Company Common Stock pursuant
         to the Merger  (including  fractional shares of Parent Common Stock for
         which cash is received)  will be the same as the aggregate tax basis of
         such shares of Company  Common  Stock,  (A)  decreased by the amount of
         cash received in exchange for shares of Company  Common Stock  pursuant
         to an election to receive cash and (B)  increased by the amount of gain
         recognized (determined under clause (iv) above);

                  (vi) The  holding  period  for shares of Parent  Common  Stock
         received in exchange for shares of Company Common Stock pursuant to the
         Merger will include the period that such shares of Company Common Stock
         were held by the  stockholder,  provided such shares of Company  Common
         Stock were held as capital assets by such  stockholder at the Effective
         Time; and

                  (vii) A  stockholder  of the Company who receives cash in lieu
         of a fractional  share of Parent  Common stock will  recognize  gain or
         loss equal to the difference,  if any, between such stockholder's basis
         in such  fractional  share (as  described  in clause (v) above) and the
         amount of cash received.

In  rendering  such  opinion,   Sidley  &  Austin  may  receive  and  rely  upon
representations  from  others,  including  representations  from the Company and
Holding  contained in certificates  substantially in the form of the Company Tax
Certificate and the Tax Matters Certificate attached hereto as Annex M and Annex
M-2,  representations  from Holding contained in a certificate  substantially in
the  form of the  Parent  Tax  Certificate  attached  hereto  as  Annex  N,  and
representations  in a certificate  substantially  in the form of the Tax Matters
Certificate  attached  hereto as Annex O from certain persons who own, as of the
Effective  Time,  five percent (5%) or more of the total number of shares of the
Company or of VoiceStream (or, in such counsel's discretion, of Omnipoint).

         (c) Consents Under  Agreements.  Parent shall have obtained the consent
or  approval  of each  person  whose  consent or  approval  shall be required in
connection  with the  transactions  contemplated  hereby  under  any  indenture,
mortgage,  evidence of  indebtedness,  lease or other agreement or instrument to
which Parent or one of its Subsidiaries is a party,  except where the failure to
obtain  the same  would  not  reasonably  be  expected,  individually  or in the
aggregate,  to have a Material  Adverse  Effect on Parent or the Company or upon
the transactions contemplated by this Agreement.

         (d)  Intercompany Services Agreements.  The Intercompany Services

                                      -56-

<PAGE>



Agreements shall have been terminated.

         (e) Debt/Equity Replacement Agreement. The transactions contemplated by
the Debt/Equity Replacement Agreement shall have been consummated.

         (f) Series A and B Notes.  The Series A Notes and Series B Notes  shall
have been acquired by Parent and/or Parent shall have obtained consents from the
requisite  number  of  holders  of  Series  A Notes  and  Series  B Notes to the
amendment  of the Series A  Indenture  and  Series B  Indenture  (including  the
substitution  of Parent as guarantor  thereunder and the  elimination of Section
3.8 in such indentures), and Parent shall have taken such other action as may be
necessary to permit the  Reorganization  to occur without resulting in a default
under the Series A Indenture  or the Series B  Indenture,  to cause the Series A
Stockholder  to be released and  discharged  in full from the Series A Guarantee
and the Series B Guarantee and to terminate  such  guarantees on or prior to the
Effective Time.

         (g) Nokia Credit  Agreement.  Parent shall have caused all  obligations
under  the Nokia  Credit  Agreement  to be  repaid in full and the Nokia  Credit
Agreement and Nokia  Guaranty shall have been  terminated;  or Parent shall have
obtained an amendment to the Nokia Credit Agreement  (including the substitution
of Parent as guarantor  thereunder  and the release and discharge in full of the
Nokia Guaranty),  to permit the  Reorganization  to occur without resulting in a
default under the Nokia Credit;  and, in either event,  the Series A Stockholder
shall have been released and  discharged  in full from the Nokia  Guaranty on or
prior to the Effective Time.

         (h) Intercompany  Accounts.  All Intercompany  Accounts shall have been
settled  and  paid in cash  based  on  financial  information  available  at the
Effective Time.

         (i) Tax Allocation  Agreement.  The Tax Allocation Agreement shall have
been terminated.

         (j) Parent Stockholder  Agreement.  The Parent  Stockholders shall have
executed and delivered the Parent Stockholder Voting Agreement.

         (k)  Omnipoint  Agreement.  There shall have been no  amendments to the
Omnipoint  Agreement  or  the  transactions   contemplated  thereby  except  for
amendments  which would not,  individually or in the aggregate,  have a Material
Adverse Effect on Parent or on the transactions contemplated by this Agreement.

         (l)  Registration  Rights  Agreement.  Parent  shall have  executed and
delivered the Registration Rights Agreement.

         (m) FCC  Opinion.  The  Company  shall have  received an opinion of FCC
counsel to Parent, dated the Effective Time,  substantially in the form attached
hereto as Annex I.

                                      -57-

<PAGE>



         (n)  Corporate  Opinion.  The Company shall have received an opinion of
corporate and state regulatory  counsel to Parent,  dated the Effective Time, in
substantially the form attached hereto as Annex J.

         (o) Nasdaq. The shares of Parent Company Stock to be issued pursuant to
Section 2.1(c) shall have been listed on the Nasdaq National Market.

         (p) Year  2000.  There  shall not have  occurred  and be  continuing  a
Material  Adverse Effect with respect to Parent relating to the Year 2000 Issue,
provided, however, that for purposes of this condition,  clauses (i) and (ii) of
the definition of Material Adverse Effect shall be disregarded.

         Notwithstanding anything contained to the contrary in Section 7.2(a) or
anywhere  else  in  this  Agreement,   Parent  may  enter  into  any  Subsequent
Transaction,  and no  changes  of  any  representation  or  warranty  of  Parent
contained in this  Agreement  as a result of any  Subsequent  Transaction  shall
result in a failure of the conditions set forth in Section 7.2(a);  provided, in
each case, that any such Subsequent  Transaction  would not, or would reasonably
not be  expected  to  prevent,  impair or  materially  delay the  ability of the
Company or Parent to consummate the transactions contemplated by this Agreement.

         Section 7.3  Conditions  to  Obligations  of Parent and Merger Sub C to
Effect the  Reorganization.  The obligation of Parent and Merger Sub C to effect
the  Reorganization  shall  be  subject  to the  fulfillment  at or prior to the
Effective Time of the following additional conditions:

         (a) Performance of  Obligations;  Representations  and Warranties.  The
Company shall have performed each of its agreements  contained in this Agreement
required to be  performed  at or prior to the  Effective  Time,  and each of the
representations  and  warranties  of  the  Company  contained in this  Agreement
(disregarding all  qualifications  and exceptions  contained therein relating to
materiality  or  a  Material   Adverse   Effect  or  any  similar   standard  or
qualification)  shall be true and correct at and as of the Effective  Time as if
made at and as of the  Effective  Time, in each case except as  contemplated  or
permitted  by this  Agreement  and except as would not,  individually  or in the
aggregate,  reasonably  be  expected  to have a Material  Adverse  Effect on the
Company or Parent or the transactions contemplated by this Agreement; and Parent
shall have received a  certificate  signed on behalf of the Company by its Chief
Executive Officer and its Chief Financial Officer to such effect.

         (b) Tax Opinion.  Parent shall have received an opinion of Jones,  Day,
Reavis & Pogue, in form and substance  reasonably  satisfactory to Parent, dated
the  Effective  Time,  substantially  to the effect that, on the basis of facts,
representations  and  assumptions set forth in such opinion which are consistent
with the state of facts existing as of the Effective Time,


                                      -58-

<PAGE>



         (i) for federal income tax purposes, no gain or loss will be recognized
by  Holding,   Merger  Sub  C  or  the  Company   solely  as  a  result  of  the
Reorganization; and

         (ii) in the case of the  VoiceStream  Merger,  (x) such  merger will be
treated for federal income tax purposes as a reorganization described in section
368(a) of the  Code,  and each of  VoiceStream,  Holding  and,  in the case of a
reorganization described in section 368(a)(2)(E) of the Code, Merger Sub A, will
be a party to the  reorganization  within the  meaning of section  368(b) of the
Code,  or (y) such  merger  will be  treated as a transfer  of  property  by the
VoiceStream  stockholders,  other than holders of dissenting  shares, to Holding
described in section 351(a) of the Code.

In rendering such opinion,  Jones, Day, Reavis & Pogue may receive and rely upon
representations  from  others,  including  representations  from the Company and
VoiceStream  contained in certificates  substantially in the form of the Company
Tax  Certificate,  the VoiceStream  Certificate and the Tax Matters  Certificate
attached  hereto  as Annex M,  Annex  M-1 and Annex  M-2,  representations  from
Holding  contained in certificates  substantially  in the form of the Parent Tax
Certificate and the VoiceStream  Wireless Holding Certificate attached hereto as
Annex N and Annex N-1, and representations  substantially in the form of the Tax
Matters Certificate  attached hereto as Annex O from certain persons who own, as
of the Effective  Time,  five percent (5%) or more of the total number of shares
of  the  Company  or of  VoiceStream  (or,  in  such  counsel's  discretion,  of
Omnipoint).

         (c) FCC Opinion.  Parent shall have  received an opinion of FCC counsel
of the Company,  dated the  Effective  Time  substantially  in the form attached
hereto as Annex K.

         (d)  Corporate  Opinion.  Parent  shall  have  received  an  opinion of
corporate  and state  regulatory  counsel to the  Company in form and  substance
reasonably  acceptable to Parent  substantially  in the form attached  hereto as
Annex L.

         (e) Consents  Under  Agreements.  The Company  shall have  obtained the
consent or approval of each person whose  consent or approval  shall be required
in connection  with the  transactions  contemplated  hereby under any indenture,
mortgage,  evidence of  indebtedness,  lease or other agreement or instrument to
which  the  Company  or one of its  Subsidiaries  is a party,  except  where the
failure to obtain the same would not reasonably be expected,  individually or in
the  aggregate,  to have a Material  Adverse  Effect on the Company or Parent or
upon the transactions contemplated by this Agreement.

         (f)  Indemnity  Agreement.  The  Indemnity  Agreement  shall  have been
authorized, executed and delivered by the parties thereto.

         (g) Year  2000.  There  shall not have  occurred  and be  continuing  a
Material  Adverse  Effect with respect to the Company  relating to the Year 2000
Issue, provided,

                                      -59-

<PAGE>



however,  that  for  purposes  of this  condition,  clauses  (i) and (ii) of the
definition of Material Adverse Effect shall be disregarded.

         (h) Dissenting  Shares.  No more than 7.5% of the shares of VoiceStream
Common  Stock  outstanding  immediately  prior to the  Effective  Time  shall be
Dissenting Shares.

         (i)  Parent  shall  have  received  from  the  Company,  the  Series  A
Stockholder  and the  Investor,  a  Certificate,  dated the  Effective  Date, in
substantially  the same form as Annex O (in the case of the Series A Stockholder
and the Investor) or Annex M-2 (in the case of the Company).

         (j) Parent shall have received a written fairness opinion from Goldman,
Sachs & Co.  confirming its oral fairness  opinion  referred to in Section 4.19,
within 5 Business Days of the execution of this Agreement.

                    Article VIII - Termination and Amendment

         Section 8.1  Termination.  This Agreement may be terminated at any time
prior to the  Effective  Time,  whether  before  or after  any  approval  by the
stockholders  of Parent or the Company of the matters  presented  in  connection
with the Reorganization:

         (a)  by mutual written consent of Parent, Merger Sub C and the Company;

         (b) by either Parent or the Company:

                  (i) if the Reorganization has not been effected on or prior to
         the close of business on September 17, 2000 (the  "Termination  Date");
         provided,  however, that if the Reorganization has not occurred by such
         date due to the fact that the condition set forth in Section 7.1(f) has
         not been satisfied but all other conditions  hereto have been satisfied
         or  waived  or are  then  capable  of  promptly  being  satisfied,  the
         Termination Date shall be December 17, 2000;  provided,  further,  that
         the  right  to  terminate  this  Agreement  pursuant  to  this  Section
         8.1(b)(i)  shall not be available to any party whose failure to fulfill
         any obligation of this Agreement has been the cause of, or resulted in,
         the failure of the  Reorganization to have occurred on or prior to such
         date; or

                  (ii) if any  Governmental  Entity  shall have issued an order,
         decree  or ruling or taken  any  other  action  permanently  enjoining,
         restraining or otherwise  prohibiting the transactions  contemplated by
         this  Agreement and such order,  decree or ruling or other action shall
         have become final and nonappealable;  provided, however, that the right
         to terminate this Agreement  pursuant to this Section  8.1(b)(ii) shall
         not be  available  to any  party who has not used its best  efforts  to
         cause such  order to be lifted or  otherwise  taken  such  action as is
         required to comply with Section 6.14;

                                      -60-

<PAGE>



         (c) by Parent if (i) the  Company  shall have failed to comply with any
of its  covenants  or  agreements  contained  in this  Agreement  required to be
complied  with  prior  to the date of such  termination,  except  as  would  not
reasonably  be  expected  to have a Material  Adverse  Effect on the  Company or
Parent or the  transactions  contemplated  by this  Agreement,  which failure to
comply  cannot be or has not been  cured  within 30 days  after  receipt  by the
Company of written notice of such failure to comply or (ii) the  stockholders of
the Company  shall not approve the  Reorganization  at the Company  Stockholders
Meeting or any adjournment thereof;

         (d) by the  Company if (i) Parent or Merger Sub C shall have  failed to
comply with any of its  respective  covenants  or  agreements  contained in this
Agreement  required to be complied  with prior to the date of such  termination,
except as would not reasonably be expected to have a Material  Adverse Effect on
the Company or Parent or the transactions contemplated by this Agreement,  which
failure to comply  cannot be or has not been cured within 30 days after  receipt
by Parent of written  notice of such failure to comply or (ii) the  stockholders
of Parent shall not approve the Parent Share Issuance at the Parent Stockholders
Meeting or any adjournment thereof; or

         (e) by either  Parent or the  Company if there has been a breach by the
other  (or  Merger  Sub C if  the  Company  is  the  terminating  party)  of any
representation  or warranty  (disregarding  all  qualifications  and  exceptions
contained  therein  relating to materiality or a Material  Adverse Effect or any
similar standard or  qualification)  except any breach that would not reasonably
be  expected to have a Material  Adverse  Effect on the Company or Parent or the
transactions contemplated by this Agreement, in each case which breach cannot be
or has not been cured  within 30 days after  receipt by the  breaching  party of
written notice of the breach.

         Section 8.2 Effect of  Termination.  In the event of a  termination  of
this  Agreement by either the Company or Parent as provided in Section 8.1, this
Agreement  shall  forthwith  become  void and  there  shall be no  liability  or
obligation  on the  part  of  Parent,  Merger  Sub C or  the  Company  or  their
respective  officers or directors,  except with respect to Section 3.18, Section
4.14,  Section 6.9, this Section 8.2 and Article IX);  provided,  however,  that
nothing in this  Article  VIII shall  relieve  any party for  liability  for any
breach of this Agreement;  provided, further, that the parties hereto agree that
any damages for a breach of this  Agreement  by the Company  shall be reduced by
the amount of any payment to Parent pursuant to Section 6.9(b)(ii).

         Section 8.3  Amendment.  This  Agreement  may be amended by the parties
hereto,  by or pursuant to action taken by their respective Boards of Directors,
at any time  before or after  approval  by the  stockholders  of Parent  and the
Company of the matters presented to them in connection with the  Reorganization;
provided,  however,  that after any such approval, no amendment shall be made if
applicable law would require further approval by such stockholders,  unless such
further approval shall be obtained.  This Agreement may not be amended except by
an instrument in writing signed on behalf of each of the parties hereto.

                                      -61-

<PAGE>



         Section 8.4 Extension; Waiver. At any time prior to the Effective Time,
the parties hereto,  by action taken or authorized by their  respective Board of
Directors,  may,  to the  extent  legally  allowed,  (i) extend the time for the
performance of any of the obligations or other acts of the other parties hereto,
(ii) waive any  inaccuracies  in the  representations  and warranties  contained
herein or in any document  delivered  pursuant hereto or (iii) waive  compliance
with any of the agreements or conditions  contained herein. Any agreement on the
part of a party  hereto to any such  extension  or waiver shall be valid only if
set forth in a written instrument signed on behalf of such party. The failure of
any party to this  Agreement to assert any of its rights under this Agreement or
otherwise shall not constitute a waiver of those rights.


                         Article IX - General Provisions

         Section  9.1  Non-Survival  of   Representations   and  Warranties  and
Agreements.  None of the  representations and warranties in this Agreement or in
any instrument  delivered pursuant to this Agreement shall survive the Effective
Time or,  except as set forth in Section 8.2  hereof,  the  termination  of this
Agreement  pursuant to the terms  hereof.  This  Section 9.1 shall not limit any
covenant or agreement of the parties which by its terms contemplates performance
after the Effective Time of the Reorganization.

         Section 9.2  Notices.  All notices and other  communications  hereunder
shall be in writing and shall be deemed given if delivered  personally,  sent by
overnight   courier   (providing  proof  of  delivery)  or  telecopied  (with  a
confirmatory  copy sent by  overnight  courier) to the parties at the  following
addresses  (or at such other  address for a party as shall be  specified by like
notice):

         (a)  if to Parent or Sub, to:

                           VoiceStream Wireless Corporation
                           3650 131st Avenue SE, Suite 400
                           Bellevue, WA  98006
                           Attn:  General Counsel
                           Telecopy No.:   425-586-8080

         with a copy to:

                           Preston Gates & Ellis LLP
                           5000 Columbia Center
                           701 Fifth Avenue
                           Seattle, WA  98104
                           Attn:  Richard B. Dodd, Esq.
                           Telecopy No:    206-623-7022


                                      -62-

<PAGE>



         (b)  if to the Company, to:

                           Aerial Communications, Inc.
                           8410 West Bryn Mawr, Suite 1100
                           Chicago, Illinois  60631
                           Attn:  President
                           Telecopy No.:  773-399-4147

         with a copy to:

                           Aerial Communications, Inc.
                           c/o Telephone and Data Systems, Inc.
                           30 North LaSalle, Suite 4000
                           Chicago, Illinois  60602
                           Attn:  Chairman
                           Telecopy No.:  312-853-9299

         with a copy to:

                           Sidley & Austin
                           One First National Plaza
                           Chicago, Illinois  60603
                           Attn:  Michael G. Hron, Esq.
                           Telecopy No.:  312-853-7036

         Section 9.3  Interpretation;  Definitions.  When a reference is made in
this  Agreement  to an  Article,  Section,  Schedule,  Annex  or  Exhibit,  such
reference shall be to an Article,  Section,  Schedule,  Annex or Exhibit of this
Agreement unless otherwise  indicated or unless the context otherwise  requires.
The table of contents and headings contained in this Agreement are for reference
purposes only and shall not affect in any way the meaning or  interpretation  of
this Agreement. Whenever the words "include," "includes" or "including" are used
in this  Agreement,  they shall be deemed to be followed  by the words  "without
limitation."  References  to a Person are also  references  to its  assigns  and
successors  in  interest  (by means of merger,  consolidation  or sale of all or
substantially  all the assets of such Person or otherwise,  as the case may be).
References to a document are to such  document as amended,  waived and otherwise
modified  from time to time and  references  to a statute or other  governmental
rule are to such statute or rule as amended and otherwise  modified from time to
time (and  references to any provision  thereof shall include  references to any
successor  provision).  The definitions set forth herein are equally  applicable
both to the  singular and plural forms and the  feminine,  masculine  and neuter
forms of the terms  defined.  The term  "hereof" and similar terms refer to this
Agreement as a whole.  As used in this  Agreement,  the phrase "made  available"
shall mean that the information referred to has been made available if requested
by the party to whom such information is to be made available.

                                      -63-

<PAGE>



         As used in this  Agreement,  the  following  terms  have  the  meanings
specified or referred to in this Section 9.3.

         "Acquisition  Proposal"  means  any  offer  or  proposal  for,  or  any
indication of interest in (i) a merger, consolidation,  share exchange, business
combination, reorganization, recapitalization, liquidation, dissolution or other
similar transaction  involving the Company or any of its Subsidiaries;  (ii) the
acquisition,  directly  or  indirectly,  in a single  transaction  or  series of
related transactions, of (A) an equity interest representing greater than 15% of
the  voting  power of the  Company  or any of its  Subsidiaries  or (B)  assets,
securities  or ownership  interests  representing  an amount equal to or greater
than 15% of the  consolidated  assets or earning  power of the  Company  and its
Subsidiaries,  other than the  transactions  contemplated by this Agreement;  or
(iii) the  consummation  of any other  transaction  or the entering  into of any
other  agreement  or  arrangement  with respect to any other  transactions,  the
effect of which would have the same result as the occurrence of (i) or (ii).

         "Action" shall mean any action, suit, arbitration,  inquiry, proceeding
or investigation by or before any court, any governmental or other regulatory or
administrative agency or commission or any arbitration tribunal.

         "Adjusted  Fully  Diluted  Shares"  shall have the meaning set forth in
Section 2.1(e).

         "Affiliate"  shall mean with  respect to any Person,  any other  Person
directly or indirectly controlling,  controlled by, or under common control with
such  Person  provided  that,  for  purposes  of  this   definition,   "control"
(including,  with  correlative  meanings,  the terms  "controlled by" and "under
common  control  with"),  as used with  respect  to any  Person,  shall mean the
possession,  directly  or  indirectly,  of the  power to  direct  or  cause  the
direction of the  management  and policies of such Person,  whether  through the
ownership of voting securities or by contract or otherwise.

         "Agreement" shall mean this Agreement and Plan of Reorganization  dated
the date hereof among Parent, Merger Sub C and the Company and shall include the
Schedules, Annexes, Exhibits and disclosure letters attached or related thereto.

         "Business  Day" means a day other than a Saturday,  Sunday or other day
on which  commercial  banks in New York  City,  Chicago,  Illinois  or  Seattle,
Washington are authorized or required by law to close.

         "Cash  Consideration  Fund" shall have the meaning set forth in Section
2.2(a).

         "Cash Election" shall have the meaning set forth in Section 2.1(c).

         "Cash Election Form" shall have the meaning set forth in Section 2.1(d)


                                      -64-

<PAGE>



         "Cash Management  Agreement" shall mean the Cash Management  Agreement,
dated April 15, 1996, between Series A Stockholder and the Company, as amended.

         "Certificate of Merger" shall have the meaning set forth in Section 1.3

         "Closing" shall have the meaning set forth in Section 1.2.

         "Closing Date" shall have the meaning set forth in Section 1.2.

         "Closing  Date Market  Price" means with respect to one share of Parent
Common Stock,  the average of the Mean Price  (calculated on a weighted  average
based  upon the volume of shares  traded on each day) for such share  during the
period of the 15 most recent  trading  days ending on the  Business Day prior to
the Effective Time.

         "Code" shall mean the Internal Revenue Code of 1986, as amended.

         "Communications  Act" shall  mean the  Communications  Act of 1934,  as
amended, and the Telecommunications  Act of 1996, as amended,  together with the
rules, regulations and published decisions of the FCC promulgated thereunder.

         "Company"  shall  have  the  meaning  set  forth  in  the  introductory
paragraph of this Agreement.

         "Company Benefit Plan" shall mean any bonus,  pension,  profit sharing,
deferred compensation,  incentive compensation, stock ownership, stock purchase,
stock option, phantom stock, retirement,  vacation, severance, disability, death
benefit,  hospitalization,  medical, life insurance,  supplemental  unemployment
benefits, employee stock purchase, stock appreciation, restricted stock or other
employee benefit plan, policy or arrangement  providing  benefits to any current
or  former  employee,  officer  or  director  of  the  Company  or  any  of  its
Subsidiaries.

         "Company  Certificates"  shall  have the  meaning  set forth in Section
2.2(a).

         "Company  Common  Shares" shall have the meaning set forth in the first
recital of this Agreement.

         "Company  Common Stock" shall have the meaning set forth in the recital
provision of this Agreement.

         "Company Employee" shall mean any employee of the Company or any of its
Subsidiaries.

         "Company  Filed SEC  Documents"  shall  have the  meaning  set forth in
Section 3.7.


                                      -65-

<PAGE>



         "Company Financial Advisor" shall have the meaning set forth in Section
3.17.

         "Company Letter" shall mean the letter from the Company to Parent dated
the date  hereof,  which  letter  relates to this  Agreement  and is  designated
therein as the Company Letter.

         "Company Permits" shall have the meaning set forth in Section 3.9.

         "Company  Preferred  Stock" shall have the meaning set forth in Section
3.3.

         "Company  Registration  Rights  Agreement"  shall mean the Registration
Rights  Agreement,  dated April 15, 1996,  between Series A Stockholder  and the
Company, as amended.

         "Company  Restricted  Stock  Units" shall mean  restricted  stock units
granted under the Company Restricted Stock Unit Plan.

         "Company  SEC  Documents"  shall have the  meaning set forth in Section
3.6.

         "Company  Series A Common  Shares"  shall have the meaning set forth in
the first recital of this Agreement.

         "Company  Stockholders  Meeting"  shall have the  meaning  set forth in
Section 6.3.

         "Company  Stock  Options"  shall have the  meaning set forth in Section
3.3.

         "Company Subsidiaries" shall have the meaning set forth in Section 3.1.

         "Confidentiality Agreement" shall have the meaning set forth in Section
6.6.

         "Constituent  Corporations"  shall  have the  meaning  set forth in the
introductory paragraph of this Agreement.

         "Conversion Number" shall have the meaning set forth in Section 2.1(c).

         "D&O Insurance" shall have the meaning set forth in Section 6.13(b).

         "Debt/Equity   Replacement   Agreement"   shall  mean  the  Debt/Equity
Replacement Agreement in the form attached hereto as Annex F.

         "DGCL" shall mean the General Corporation Law of the State of Delaware.

         "Dissenting  Shares"  shall  have the  meaning  set  forth  in  Section
1.0(c)(vii).


                                      -66-

<PAGE>



         "Effective Date" shall have the meaning set forth in Section 6.26(a).

         "Effective Time" shall have the meaning set forth in Section 1.3.

         "Election Deadline" shall have the meaning set forth in Section 2.1(e).

         "Employee  Benefit  Plans  Agreement"  shall mean the Employee  Benefit
Plans  Agreement,  dated April 15, 1996,  between  Series A Stockholder  and the
Company, as amended.

         "Employee  Benefit Plans Separation  Agreement" shall mean the Employee
Benefit Plans Separation Agreement in the form attached hereto as Annex D.

         "Environmental Laws" shall mean any applicable statute, law, ordinance,
regulation,  rule, judgment, decree or order of any Governmental Entity relating
to or regulating  or imposing  liability or standards of conduct with respect to
pollution,  protection of the environment or environmental regulation or control
or regarding Hazardous Substances or occupational health or safety.

         "Environmental  Permits"  shall mean,  with respect to any Person,  all
permits,  licenses,  franchises,   certificates,  approvals  and  other  similar
authorizations   of  any   Governmental   Entity  relating  to  or  required  by
Environmental  Laws and  affecting,  or relating in any way to, the  business of
such Person or any of its Subsidiaries as currently conducted.

         "ERISA" shall mean the Employee Retirement Income Security Act of 1974,
as amended, together with the rules and regulations promulgated thereunder.

         "ERISA  Affiliate" shall mean (i) any corporation  which is a member of
the same controlled group of corporations  (within the meaning of Section 414(b)
of the Code) as the Company; (ii) any partnership, trade or business (whether or
not  incorporated)  which on the day before the  Closing  Date was under  common
control (within the meaning of Section 414(c) of the Code) with the Company; and
(iii) any entity which is a member of the same affiliated  service group (within
the meaning of Section 414(m) of the Code as either the Company, any corporation
described  in clause (i) or any  partnership,  trade or  business  described  in
clause (ii).

         "ERISA Benefit Plan" shall mean a Company Benefit Plan maintained as of
the date of this Agreement which is also an "employee  pension benefit plan" (as
defined in Section 3(2) of ERISA) or which is also an "employee  welfare benefit
plan" (as defined in Section 3(1) of ERISA).

         "Exchange  Act"  shall mean the  Securities  Exchange  Act of 1934,  as
amended, together with the rules and regulations promulgated thereunder.


                                      -67-

<PAGE>



         "Exchange Agent" shall have the meaning set forth in Section 2.2(a).

         "Exchange Agreement" shall mean the Exchange Agreement, dated April 15,
1996, between Series A Stockholder and the Company, as amended.

         "Exchange Fund" shall have the meaning set forth in Section 2.2(a).

         "Exchange  Rate" shall mean the  "Exchange  Rate  Applicable  to Aerial
Common Shares" as defined in Section 7.2 of the Investment Agreement as adjusted
pursuant to Section 7.3 of the Investment Agreement, as specified in Item 3.2 of
the "Company Letter."

         "FAA" shall mean the Federal Aviation  Administration and any successor
agency or body.

         "FCC"  shall  mean  the  Federal  Communications   Commission  and  any
successor agency or body.

         "Final Order" shall mean action by the applicable  regulatory authority
(the  "Agency")  which is in full  force and  effect,  with  respect to which no
petition or other request for Agency or court stay, reconsideration or review of
any kind is pending,  and as to which all time periods have expired within which
the Agency or a court may be asked to stay,  reconsider  or review the action or
may stay, reconsider or review the action sua sponte.

         "Governmental Entity" shall mean any federal, state or local government
or  any  court,   tribunal,   administrative   agency  or  commission  or  other
governmental  or other  regulatory  authority  or agency,  domestic,  foreign or
supranational,  including  the FAA, FCC and any state public  utility or service
commission or similar agency.

         "Hazardous  Substance"  shall  mean any  material  defined  as toxic or
hazardous,  including any petroleum and petroleum products, under any applicable
Environmental Law.

         "Holding" shall have the meaning set forth in the recitals hereto.

         "Holding Common Stock" shall have the meaning set forth in Section 4.3.

         "HSR Act" shall mean the Hart-Scott-Rodino  Antitrust  Improvements Act
of 1976, as amended.

         "Indebtedness"   of  any   Person  at  any  date  shall  mean  (a)  all
indebtedness  of such Person for  borrowed  money or for the  deferred  purchase
price of property or services (other than current trade liabilities  incurred in
the  ordinary  course of  business  and  payable in  accordance  with  customary
practices), (b) any other indebtedness of

         -68-

<PAGE>



such Person which is evidenced by a note, bond, debenture or similar instrument,
(c) all obligations of such Person under financing  leases,  (d) all obligations
of such  Person in respect of  acceptances  issued or created for the account of
such  Person and with  respect to unpaid  reimbursement  obligations  related to
letters of credit issued for the account of such Person and (e) all  liabilities
secured by any Lien on any property owned by such Person even though such Person
has not assumed or otherwise become liable for the payment thereof.

         "Indemnified  Person"  shall  have the  meaning  set  forth in  Section
6.13(a).

         "Insurance  Cost  Sharing  Agreement"  shall  mean the  Insurance  Cost
Sharing  Agreement,  dated April 15, 1996,  between Series A Stockholder and the
Company, as amended.

         "Intellectual  Property  Rights"  shall  mean  any  right  to use,  all
patents,  patent rights,  trademarks,  trade names, trade dress, logos,  service
marks,  copyrights,  know how and other proprietary intellectual property rights
and computer programs held or used by the Company or any of its Subsidiaries.

         "Intercompany  Accounts"  shall have the  meaning  set forth in Section
6.23.

         "Intercompany  Agreement" shall mean the Intercompany Agreement,  dated
April 15, 1996, by and between the Company and Series A Stockholder, as amended.

         "Intercompany  Service  Agreements" shall have the meaning set forth in
Section 6.19.

         "Investment Agreement" shall mean the Investment Agreement, dated as of
September 8, 1998,  by and among the Company,  Series A  Stockholder,  Operating
Company and Investor, as amended.

         "Investment Entity" shall mean an entity in which the Company or any of
its Subsidiaries has an Investment Interest.

         "Investment  Interest" shall mean a direct or indirect ownership of (i)
capital stock, bonds,  debentures,  partnership,  membership  interests or other
ownership  interests or other securities of any Person; (ii) any deposit with or
advance,  loan or other extension of credit  (including the purchase of property
from another  Person  subject to an  understanding  or agreement,  contingent or
otherwise  to resell such  property to such other  Person) to any other  Person;
(iii) any revenue or profit  interests  pursuant to any  agreement or license or
(iv) any agreement, commitment, right, understanding or arrangement with respect
to any of the items referred to in (i), (ii) or (iii) of this definition.

         "Investor"  shall  mean  Sonera,  Ltd.,  a  Finnish  limited  liability
company, which holds an investment in Operating Company.

                                      -69-

<PAGE>



         "Joint  Proxy  Statement"  shall have the  meaning set forth in Section
3.8.

         "Joint Venture  Agreement" shall mean the Joint Venture Agreement dated
as of September 8, 1998, by and among the Company,  Operating Company and Sonera
Corporation U.S.

         "knowledge"  shall mean the actual knowledge of the executive  officers
of the Company or its Subsidiaries or the executive  officers of Parent,  as the
case may be who have  exercised  reasonable  due  diligence  with respect to the
representation and warranty to which such knowledge statement is made.

         "Liabilities"   shall   mean  any  and  all  debts,   liabilities   and
obligations,  absolute  or  contingent,  matured  or  unmatured,  liquidated  or
unliquidated, accrued or unaccrued, whenever arising (unless otherwise specified
in this  Agreement),  including  all costs and expenses  relating  thereto,  and
including,  without limitation, those debts, liabilities and obligations arising
under any law, rule,  regulation,  Action,  threatened Action,  order or consent
decree of any  governmental  entity or any award of any  arbitrator of any kind,
and those arising under any contract, commitment or undertaking.

         "Liens" shall mean any pledges,  claims, liens,  charges,  encumbrances
and security interests of any kind or nature whatsoever.

         "Long-Term Incentive Plan" shall mean the Company's 1996 Long-Term
Incentive Plan.

         "Losses" shall mean losses,  Liabilities,  claims,  damages,  payments,
absolute  or  contingent,  matured or  unmatured,  liquidated  or  unliquidated,
accrued or unaccrued, known or unknown (including, without limitation, the costs
and expenses of any and all Actions,  threatened Actions, demands,  assessments,
judgments,  settlements and compromises relating thereto and attorneys' fees and
any and all expenses whatsoever reasonably incurred in investigating,  preparing
or defending against any such Actions or threatened Actions.

         "Management Side Letter" shall mean the letter dated September 8, 1998,
among Series A Stockholder, the Company and Investor.

         "Material Adverse Change" or "Material Adverse Effect" shall mean, when
used in connection with the Company or Parent, as the case may be, any change or
effect (or any  development  that,  insofar as can  reasonably  be foreseen,  is
likely  to  result  in any  change  or  effect)  or  fact or  condition  that is
materially adverse to the business,  properties,  assets, financial condition or
results of operations of the Company and its  Subsidiaries  taken as a whole, or
Parent  and its  Subsidiaries  taken as a whole,  as the case may be,  provided,
however,  that (i) any adverse change,  effect or development  that is primarily
caused by  conditions  affecting  the United  States  economy  generally  or the
economy of any nation or region in which the Company or Parent, as the case may

                                      -70-

<PAGE>



be, or its  Subsidiaries  conducts  business that is material to the business of
the  Company or Parent,  as the case may be,  and its  Subsidiaries,  taken as a
whole, shall not be taken into account in determining whether there has been (or
whether  there could  reasonably  be  foreseen) a "Material  Adverse  Change" or
"Material Adverse Effect" with respect to the Company or Parent, as the case may
be, (ii) any adverse change,  effect or development  that is primarily caused by
conditions generally affecting the industries in which the Company or Parent, as
the case may be,  conducts  its  business  shall not be taken  into  account  in
determining  whether  there  has been (or  whether  there  could  reasonably  be
foreseen) a "Material  Adverse Change" or "Material Adverse Effect" with respect
to the  Company or Parent,  as the case may be,  and (iii) any  adverse  change,
effect or development  that is primarily  caused by the announcement or pendency
of this Agreement,  the Reorganization or the transactions  contemplated  hereby
shall  not be taken  into  account  in  determining  whether  there has been (or
whether  there could  reasonably  be  foreseen) a "Material  Adverse  Change" or
"Material Adverse Effect" with respect to the Company or Parent, as the case may
be;  and  a  "Material   Adverse  Effect"  with  respect  to  the   transactions
contemplated  by this Agreement  shall mean any event,  fact or condition  which
would  reasonably be expected to materially  delay,  interfere  with,  impair or
prevent the transactions  contemplated by this agreement in a manner which would
have a material adverse effect on such transactions taken as a whole considering
the intentions and expectations of the parties hereto;  provided,  however, that
for the purpose of Section 7.1(b), clause (iii) above shall not be excluded.

         "Mean  Price"  means,  on any day in which shares are traded on Nasdaq,
the  average  of the high and low  trading  prices for which one share of Parent
Common Stock is traded on Nasdaq as reported by The Wall Street Journal.

         "Merger"  shall  have the  meaning  set forth in the  recitals  to this
Agreement.

         "Merger Documents" shall have the meaning set forth in Section 1.0.

         "Merger Sub A" shall have the meaning set forth in the recitals to this
Agreement.

         "Merger Sub B" shall have the meaning set forth in the recitals to this
Agreement.

         "Merger Sub C" shall have the meaning set forth in the recitals to this
Agreement.

         "Nasdaq" shall have the meaning set forth in Section 2.2(e).

         "Nokia"   shall  mean  Nokia   Telecommunications,   Inc.,  a  Delaware
corporation.

         "Nokia Credit  Agreement"  shall mean the Credit  Agreement dated as of
June 30,

                                      -71-

<PAGE>



1998 among the Company,  Nokia and the financial  institutions named therein, as
amended.

         "Nokia  Guaranty"  shall mean the  Guaranty,  dated June 30,  1998,  by
Series A Stockholder of the  obligations of the Company to Nokia under the Nokia
Credit Agreement.

         "Omnipoint  Agreement" shall mean the transactions  contemplated by the
Agreement  and Plan or  Reorganization  dated as of June 23,  1999 by and  among
Parent, VoiceStream Wireless Holding Corporation and Omnipoint Corporation.

         "Omnipoint  Merger" shall have the meaning set forth in the recitals to
this Agreement.

         "Omnipoint  Reorganization"  shall  have the  meaning  set forth in the
recitals hereto.

         "Omnipoint  End Date"  shall  mean the "End  Date",  as  defined in the
Omnipoint  Agreement,  provided  that such date  shall be no later than June 30,
2000.

         "Operating  Company"  shall mean  Aerial  Operating  Company,  Inc.,  a
Delaware corporation and Subsidiary of the Company.

         "Operating Company Shares" shall mean shares of common stock, $.001 par
value, of Operating Company.

         "Parent" shall have the meaning set forth in Section 1.0.

         "Parent  Certificates"  shall  have the  meaning  set forth in  Section
2.2(a).

         "Parent  Common Stock" shall have the meaning set forth in the recitals
of this Agreement.

         "Parent  Filed  SEC  Documents"  shall  have the  meaning  set forth in
Section 4.7.

         "Parent  Letter" shall mean the letter from Parent to the Company dated
the date  hereof,  which  letter  relates to this  Agreement  and is  designated
therein as the Parent Letter.

         "Parent Permits"  shall have the meaning set forth in Section 4.9.

         "Parent SEC Documents" shall have the meaning set forth in Section 4.6.

         "Parent  Share  Issuance"  shall have the  meaning set forth in Section
4.4.


                                      -72-

<PAGE>



         "Parent Stockholders" shall have the meaning set forth in Section 6.25.

         "Parent  Stockholder  Meeting"  shall  have the  meaning  set  forth in
Section 6.3(b).

         "Parent Subsidiaries" shall have the meaning set forth in Section 4.1.

         "Per Share Cash  Consideration"  shall  have the  meaning  set forth in
Section 2.1(c).

         "Per Share Cash  Value"  shall  have the  meaning  set forth in Section
2.1(c).

         "Per Share  Stock  Consideration"  shall have the  meaning set forth in
Section 2.1(d).

         "Person" shall mean an individual,  corporation,  partnership,  limited
liability   company,   joint   venture,   association,   joint  stock   company,
unincorporated syndicate, unincorporated organization, trust, trustee, executor,
administrator or other legal representative,  governmental  authority or agency,
political subdivision, or any group of Persons acting in concert.

         "Public Holders" shall have the meaning set forth in Section 2.1(d).

         "Registration  Rights  Agreement"  shall mean the  Registration  Rights
Agreement  attached to the  Stockholder  Agreement  to be entered  into  between
Series A Stockholder and Parent.

         "Registration  Statement"  shall have the  meaning set forth in Section
4.4.

         "Reorganization"  shall have the meaning  set forth in the  recitals to
this Agreement.

         "Restricted Stock Plan" shall mean the Company's  Retention  Restricted
Stock Unit Plan.

         "Retained Employee" shall have the meaning set forth in Section 6.1(a).

         "Revolving Credit Agreement" shall mean the Revolving Credit Agreement,
dated August 31, 1998,  between Series A Stockholder and Operating  Company,  as
amended.

         "Revolving  Credit  Agreement  Guaranty"  shall mean the Guaranty dated
August 31, 1998 by the Company of the obligations of Operating Company to Series
A Stockholder under the Revolving Credit Agreement,  as reaffirmed in connection
with any amendment to the Revolving Credit Agreement.

         "Rule 145 Affiliates" shall have the meaning set forth in Section 6.7.

                                      -73-

<PAGE>



         "SEC" shall mean the Securities and Exchange Commission.

         "Securities  Act" shall mean the  Securities  Act of 1933,  as amended,
together with the rules and regulations promulgated thereunder.

         "Series A Guaranty" shall mean the Guaranty by the Series A Stockholder
of the obligations of the Company under the Series A Notes.

         "Series A Indenture"  shall mean the Indenture  dated as of November 4,
1996,  among the Company,  Series A Stockholder  and The First  National Bank of
Chicago, as supplemented, relating to the Series A Notes.

         "Series A Notes" shall mean the Series A Zero Coupon Notes due 2006, of
the Company.

         "Series A Stockholder"  shall mean Telephone and Data Systems,  Inc., a
Delaware corporation, the parent of the Company.

         "Series A Stockholder's  Group" shall mean any  "affiliated  group" (as
defined in Section 1504 of the Code without regard to the limitations  contained
in Section  1504(b) of the Code) that includes the Series A  Stockholder  or any
predecessor  of or  successor  to the  Series A  Stockholder  (or  another  such
predecessor or successor).

         "Series B Guaranty" shall mean the Guaranty by the Series A Stockholder
of the obligations of the Company under the Series B Notes.

         "Series B Indenture"  shall mean the Indenture  dated as of February 5,
1998 among the Company,  Series A  Stockholder  and The First  National  Bank of
Chicago, as supplemented, relating to the Series B Notes.

         "Series B Notes" shall mean the Series B Zero Coupon Notes due 2008, of
the Company.

         "Significant Employee" shall mean any Employee of the Company or any of
its  Subsidiaries  who  (i)  is  an  officer  of  the  Company  or  any  of  its
Subsidiaries,  (ii) has a written employment contract with the Company or any of
its Subsidiaries  which calls for annual  compensation in excess of $90,000,  or
(iii) is compensated by the Company  and/or its  Subsidiaries  at an annual rate
greater than $90,000.

         "Stock  Consideration Fund" shall have the meaning set forth in Section
2.2(a).

         "Stock Equivalents" shall have the meaning set forth in Section 3.3.

         "Stockholder  Agreement"  shall mean the  Stockholder  Agreement  to be
entered into between Series A Stockholder and Parent attached hereto as Annex D.

                                      -74-

<PAGE>



         "Subsequent  Transaction"  shall mean any  transaction,  including  the
Omnipoint  Transaction,  whereby  (i)  Parent or any of its  Subsidiaries  would
acquire (by merger, consolidation,  acquisition of stock or assets or otherwise)
any  corporation,   limited  liability  company,  partnership,   other  business
organization  or  assets  or  division  thereof,  which  is in the  business  of
providing  wireless   communication   services,   (ii)  Parent  or  any  of  its
Subsidiaries would acquire an Investment Interest in any of the foregoing, (iii)
Parent or any of its  Subsidiaries  would issue any equity interest or incur any
Indebtedness  whether in  connection  with any item  described in (i) or (ii) or
otherwise,  (iv) Parent or any of its  Subsidiaries  enters into or engages in a
strategic alliance or other commercial  relationship or (v) Parent or any of its
Subsidiaries  is acting in the ordinary  course  consistent  with past practice;
provided,  however,  in connection  with a Subsequent  Transaction  described in
items  (i),  (ii),  (iii) or (iv) of this  definition,  Parent  must  receive an
opinion  from a  nationally  recognized  investment  bank,  acting as  financial
advisor to Parent,  to the effect  that,  from a financial  point of view,  such
Subsequent  Transaction  is fair to the  holders of Parent  Common  Stock or, if
applicable, Parent.

         "Subsidiary"  or  "subsidiary"  shall  mean a person,  an amount of the
voting  securities,  other voting ownership or voting  partnership  interests of
which is  sufficient  to elect at least a majority of its Board of  Directors or
other governing body (or, if there are no such voting interests,  50% or more of
the  equity  interests  of which) is owned  directly  or  indirectly  by another
Person.

         "Substitute Options" shall have the meaning set forth in Section 6.2(b)

         "Supplemental  Agreement" shall mean the Supplemental Agreement,  dated
as of  September  8,  1998,  by and among the  Company,  Operating  Company  and
Investor.

         "Surviving Corporation" shall have the meaning set forth in Section 1.1

         "Tag-Along Right" shall have the meaning set forth in Section 2.1(c).

         "Tax" and "Taxes" shall mean any federal,  state,  local or foreign net
income,  gross income,  gross receipts,  windfall profit,  severance,  property,
production,  sales,  use,  license,  excise,  franchise,   employment,  payroll,
withholding,  alternative  or add-on  minimum  or any other tax,  custom,  duty,
governmental  fee or other  like  assessment  or charge of any kind  whatsoever,
together  with any  interest or penalty,  addition to Tax or  additional  amount
imposed by any Governmental Entity.

         "Tax  Allocation  Agreement"  shall mean the Tax Allocation  Agreement,
dated  September 8, 1998,  between  Series A  Stockholder  and the  Company,  as
amended.

         "Tax Deferred  Savings Plan" shall mean the Telephone and Data Systems,
Inc. Tax Deferred Savings Plan.


                                      -75-

<PAGE>



         "Tax  Return"  shall  mean any  return,  report  or  similar  statement
required to be filed with respect to any Tax including,  without limitation, any
information return, claim for refund, amended return or declaration of estimated
tax.

         "Tax  Settlement  Agreement"  shall mean the Tax  Settlement  Agreement
dated  March 12, 1999 among  Series A  Stockholder,  the  Company and  Operating
Company, as amended.

         "Termination Fee" shall have the meaning set forth in Section 6.9(b).

         "Transfer Taxes" shall have the meaning set forth in Section 6.11.

         "Transition  Services  Agreement"  shall mean the  Transition  Services
Agreement in the form attached hereto as Annex C.

         "VoiceStream  Common Stock" shall have the meaning set forth in Section
4.3.

         "VoiceStream ESPP" shall have the meaning set forth in Section 4.3.

         "VoiceStream ERSP" shall have the meaning set forth in Section 4.3.

         "VoiceStream  Merger"  shall have the meaning set forth in the recitals
to this Agreement.

         "VoiceStream  Option  Plan" shall have the meaning set forth in Section
4.3.

         "VoiceStream  Preferred  Stock"  shall  have the  meaning  set forth in
Section 4.3.

         "Year 2000 Issue" means a failure of a system to recognize and properly
process date-sensitive functions involving dates prior to, on and after December
31, 1999 (including, but not limited to calculation,  comparison and sequencing,
and including, without limitation, leap year calculations).

         Section  9.4   Counterparts.   This   Agreement   may  be  executed  in
counterparts,  all of which shall be considered one and the same agreement,  and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other  parties,  it being  understood  that all
parties need not sign the same counterpart.

         Section 9.5 Entire Agreement; No Third-Party Beneficiaries.  Except for
the Confidentiality  Agreement,  this Agreement constitutes the entire agreement
and supersedes all prior agreements and  understandings,  both written and oral,
among the parties with respect to the subject  matter  hereof.  This  Agreement,
except for the  provisions of Sections 6.1,  6.13, and 6.19 through 6.24, is not
intended to confer upon any person  other than the parties  hereto any rights or
remedies hereunder.

                                      -76-

<PAGE>



         SECTION 9.6  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 APPLICABLE PRINCIPLES OF CONFLICTS OF
LAWS.

         Section 9.7  Assignment.  Neither this Agreement nor any of the rights,
interests  or  obligations  hereunder  shall be  assigned  by any of the parties
hereto without the prior written  consent of the other  parties.  Subject to the
preceding  sentence,  this Agreement shall be binding upon, inure to the benefit
of, and be  enforceable  by, the parties  and their  respective  successors  and
assigns.

         Section  9.8  Severability.  If any  term or  other  provision  of this
Agreement is invalid, illegal or incapable of being enforced by any rule of law,
or public policy,  all other  conditions and provisions of this Agreement  shall
nevertheless  remain in full force and effect so long as the  economic and legal
substance of the transactions contemplated hereby are not affected in any manner
materially  adverse to any party. Upon such determination that any term or other
provision is invalid,  illegal or incapable of being enforced, the parties shall
negotiate  in good faith to modify this  Agreement  so as to effect the original
intent of the parties as closely as possible in a mutually  acceptable manner in
order that the transactions contemplated by this Agreement may be consummated as
originally contemplated to the fullest extent possible.

         Section 9.9  Enforcement  of this  Agreement.  The parties hereto agree
that  irreparable  damage would occur in the event that any of the provisions of
this  Agreement  were not performed in accordance  with their  specific terms or
were otherwise  breached in any material respect.  It is accordingly agreed that
the  parties  shall be  entitled  to an  injunction  or  injunctions  to prevent
breaches of this  Agreement and to enforce  specifically  the material terms and
provisions  hereof  in any  court  of the  United  States  or any  state  having
jurisdiction,  such remedy  being in  addition to any other  remedy to which any
party is entitled at law or in equity.

         Section 9.10  Obligations  of  Subsidiaries.  Whenever  this  Agreement
requires any Subsidiary of Parent  (including Sub) or of the Company to take any
action,  such requirement  shall be deemed to include an undertaking on the part
of Parent or the Company,  as the case may be, to cause such  Subsidiary to take
such action.

         Section  9.11   Reliance  on   Representations.   Notwithstanding   any
investigation, knowledge or review made at any time by or on behalf of any party
hereto,  the  parties   acknowledge  and  agree  that  all  representations  and
warranties  contained in this Agreement,  the Annexes,  the Company Letter,  the
Parent Letter or in any of the documents,  certification or agreements delivered
in connection therewith, are being relied upon as a material inducement to enter
into this Agreement and the transactions contemplated hereby.


                                      -77-

<PAGE>



         In Witness  Whereof,  Parent,  Merger Sub C and the Company have caused
this  Agreement  to be  signed  by  their  respective  officers  thereunto  duly
authorized all as of the date first written above.
                                            VOICESTREAM WIRELESS CORPORATION

                                            By:  /s/ Cregg B. Baumbaugh
                                               ------------------------------
                                            Name:    Cregg B. Baumbaugh
                                            Title:   Executive Vice President -
                                                     Strategy, Finance and
                                                     Development

                                            VOICESTREAM WIRELESS HOLDING
                                            CORPORATION

                                            By:  /s/ Cregg B. Baumbaugh
                                               ------------------------------
                                            Name:    Cregg B. Baumbaugh
                                            Title:   Executive Vice President -
                                                     Strategy, Finance and
                                                     Development

                                            VOICESTREAM SUBSIDIARY III
                                            CORPORATION

                                            By:  /s/ Cregg B. Baumbaugh
                                               ------------------------------
                                            Name:    Cregg B. Baumbaugh
                                            Title:   Executive Vice President -
                                                     Strategy, Finance and
                                                     Development

                                            AERIAL COMMUNICATIONS, INC.

                                            By:      /s/ LeRoy T. Carlson, Jr.
                                               --------------------------------
                                            Name:    LeRoy T. Carlson, Jr.
                                            Title:   Chairman

In addition, this Agreement is signed by the undersigned solely for the purposes
of Sections 6.16, 6.17, 6.18, 6.19, 6.20, 6.21, 6.23, 6.24, and 6.26.

                                            TELEPHONE AND DATA SYSTEMS, INC.

                                            By:      /s/ LeRoy T. Carlson
                                                  ----------------------------
                                            Name:    LeRoy T. Carlson
                                            Title:   Chairman

             SIGNATURE PAGE TO AGREEMENT AND PLAN OF REORGANIZATION

                                      -78-

<PAGE>




                                                                    Exhibit 99.3


                              STOCKHOLDER AGREEMENT

                  STOCKHOLDER  AGREEMENT,  dated as of September  17, 1999 (this
"Agreement")  by and  between  Telephone  and Data  Systems,  Inc.,  a  Delaware
corporation and stockholder (the "Stockholder") of Aerial Communications,  Inc.,
a Delaware corporation (the "Company"),  and VoiceStream Wireless Corporation, a
Washington corporation, and VoiceStream Wireless Holding Corporation, a Delaware
corporation (collectively, "Parent").

                                    RECITALS

                  WHEREAS,  the  Company,  Parent,  VoiceStream  Subsidiary  III
Corporation,  a Delaware  corporation  and a  wholly-owned  subsidiary of Parent
("Sub"),   and   Stockholder   are  entering  into  an  Agreement  and  Plan  of
Reorganization, dated as of September 17, 1999 (the "Reorganization Agreement"),
providing for,  among other things,  the merger of Sub with and into the Company
and the  conversion  of shares of Company  Common  Stock  into  shares of Parent
Common Stock;

                  WHEREAS,  the  Stockholder  owns  beneficially  and of  record
40,000,000  Company Series A Common Shares and 19,086,000  Company Common Shares
(such shares of Company Common Stock,  together with any other shares of capital
stock of the Company of which such  Stockholder  acquires  beneficial  ownership
after the date hereof and during the term of this Agreement,  being collectively
referred to herein as the "Subject Shares");

                  WHEREAS,  as a condition to its  willingness to enter into the
Reorganization Agreement, Parent has required that the Stockholder agree, and in
order  to  induce  Parent  to  enter  into  the  Reorganization  Agreement,  the
Stockholder has agreed, to enter into this Agreement; and

                  WHEREAS,  a condition  of its  willingness  to enter into this
Agreement,  Stockholder  has required that Parent agree,  and in order to induce
Stockholder  to enter  this  Agreement,  Parent  has  agreed,  to enter into the
Registration Rights Agreement attached hereto as Exhibit A.

                  NOW,  THEREFORE,  in  consideration  of the  foregoing and the
mutual  covenants and agreements  set forth herein,  the parties hereto agree as
follows:

                  1. Capitalized Terms. Capitalized terms used in this Agreement
that are not  defined  herein  shall  have  such  meanings  as set  forth in the
Reorganization Agreement.


                                        1

<PAGE>



                  2.  Covenants of  Stockholder.  Until the  termination of this
Agreement in accordance with Section 6, Stockholder agrees as follows:

                           (a)  At   any   stockholders   meeting   (or  at  any
         adjournment  thereof) or in any other  circumstances upon which a vote,
         consent or other  approval  with respect to the  Reorganization  or the
         Reorganization  Agreement  is sought,  the  Stockholder  shall vote (or
         cause to be voted) the Subject  Shares in favor of the  Reorganization,
         the  approval  and  adoption of the  Reorganization  Agreement  and the
         approval  of the  terms  thereof  and  each of the  other  transactions
         contemplated by the Reorganization Agreement.

                           (b) At any meeting of stockholders of the Company (or
         at any adjournment  thereof) or in any other circumstances upon which a
         vote,  consent or other approval is sought,  other than with respect to
         the Reorganization or Reorganization  Agreement,  the Stockholder shall
         vote (or cause to be voted)  the  Subject  Shares  against  any  merger
         agreement or merger, consolidation, sale of all or substantially all of
         the  assets   of  the  Company,  or  reorganization,  recapitalization,
         dissolution,  liquidation  or  winding  up of or by the  Company or any
         Subsidiary  of the  Company  or any  other  Acquisition  Proposal.  The
         Stockholder  further  agrees  not to commit or agree to take any action
         inconsistent with the foregoing.

                           (c) The Stockholder agrees not to (i) sell, transfer,
         pledge,  encumber,  assign or otherwise  dispose of (including by gift)
         (collectively, "Transfer"), or enter into any contract, option or other
         arrangement (including any profit-sharing  arrangement) with respect to
         any Transfer of the Subject Shares to any person (other than Parent) or
         (ii)  enter  into any  voting  arrangement,  whether  by proxy,  voting
         agreement or otherwise (collectively,  "Voting Agreement"), in relation
         to the Subject Shares, and agrees not to commit or agree to take any of
         the foregoing actions.

                           (d)  The   Stockholder   shall  not,  nor  shall  the
         Stockholder  authorize  any  affiliate,  director,  officer,  employee,
         investment  banker,  attorney or other advisor or representative of the
         Stockholder  to,  (i)  directly  or  indirectly  solicit,  initiate  or
         encourage the submission of, any Acquisition Proposal or, (ii) directly
         or indirectly participate in any discussions or negotiations regarding,
         or furnish to any person any  information  with respect to, or take any
         other action to facilitate  any inquiries or the making of any proposal
         that  constitutes  or may  reasonably  be  expected  to  lead  to,  any
         Acquisition   Proposal  or  (iii)   directly  or  indirectly   take  or
         participate   in  any   actions   set  forth  in  Section  5.3  of  the
         Reorganization Agreement.

                           (e) The  Stockholder  shall not  convert  any Company
         Series A Common Shares into Company Common Shares.

                                        2

<PAGE>



                           (f) The Stockholder shall use all reasonable  efforts
         to take, or cause to be taken,  all actions,  and to do, or cause to be
         done,  and to assist and  cooperate  with  Parent in doing,  all things
         necessary, proper or advisable to consummate and make effective, in the
         most expeditious manner  practicable,  the Reorganization and the other
         transactions contemplated by the Reorganization Agreement.

                           (g) Stockholder  hereby irrevocably waives any rights
         of  appraisal  or  rights  to  dissent  from  the  Reorganization  that
         Stockholder may have.

                           (h) At or prior to the  Effective  Time,  Stockholder
         shall take the following  actions  contemplated  by the  Reorganization
         Agreement:

                                    (i)  execute  and  deliver  the   Transition
         Services Agreement;

                                    (ii)  execute  and  deliver  the   agreement
         attached as Annex E to the Reorganization Agreement;

                                    (iii)  agree  to  the   termination  of  the
         Intercompany Service Agreements;

                                    (iv)  execute  and  deliver  the   agreement
         attached as Annex F to the Reorganization Agreement;

                                    (v) agree to the action set forth in Section
         6.21 of the Reorganization Agreement relating to the Series A Notes and
         Series B Notes,  subject to the  release and  discharge  in full of the
         Series A Guaranty and the Series B Guaranty;

                                    (vi)  agree  to  the  action  set  forth  in
         Section 6.22 of the  Reorganization  Agreement,  subject to the release
         and discharge in full of the Nokia Guaranty;

                                    (vii)  settle all  Intercompany  Accounts in
         cash on or prior to the Effective Time; and

                                    (viii)  execute  and  deliver  the  Investor
         Agreement attached as Annex H to the Reorganization Agreement; and

                                    (ix)  agree  to the  termination  of the Tax
         Allocation Agreement on or prior to the Effective Time.

              (i)  In the event the Company is required to pay the Termination

                                        3

<PAGE>



         Fee to Parent pursuant to Section 6.9 of the Reorganization  Agreement,
         Series A  Stockholder  agrees to  increase  the  amount  available  for
         borrowing  under the  Revolving  Credit  Agreement  to the  extent  the
         Company has insufficient funds to make such payment.

                  Notwithstanding  anything  to  the  contrary  herein,  nothing
herein shall limit or restrict the exercise of the fiduciary  obligations of the
Company's  Board of Directors  or the actions  which the Company is permitted to
take  under  the  terms  of the  Reorganization  Agreement,  provided,  however,
Stockholder shall continue to be bound by the terms of this Agreement.

                  3. Covenant of Parent.  On or prior to the Effective  Time (as
defined  in  the  Reorganization   Agreement),   Parent  shall  enter  into  the
Registration  Rights  Agreement with  Stockholder in the form attached hereto as
Exhibit A.

                  4.   Representations   and  Warranties  of  Stockholder.   The
Stockholder  represents and warrants (which  representations  shall continue for
the term of this Agreement) to Parent as follows:

                           (a)  Stockholder  has the legal  capacity,  power and
         authority  to enter into and perform all of  Stockholder's  obligations
         under this Agreement.  The execution,  delivery and performance of this
         Agreement by  Stockholder  has been duly  authorized  by all  requisite
         corporate action and does not violate Stockholder's charter,  bylaws or
         any other  instrument  or  agreement  or any law,  regulation  or order
         applicable to Stockholder or its assets, including, without limitation,
         any voting  agreement,  stockholders  agreement or voting  trust.  This
         Agreement  has  been  duly  and  validly   executed  and  delivered  by
         Stockholder   and   constitutes  a  valid  and  binding   agreement  of
         Stockholder,  enforceable  against  Stockholder in accordance  with its
         terms.

                           (b) (i) the  Stockholder is the record and beneficial
         owner of, and has good and  marketable  title to, the  Subject  Shares,
         (ii) the  Stockholder  does not own,  of  record or  beneficially,  any
         shares of capital  stock of the Company  other than the Subject  Shares
         and (iii) the Stockholder has the sole right to vote, the sole power of
         disposition  with  respect  to, and the sole power to demand  appraisal
         rights with  respect to, the  Subject  Shares,  and none of the Subject
         Shares  is  subject  to any  voting  trust,  proxy or other  agreement,
         arrangement or restriction with respect to the voting or disposition of
         such Subject Shares, except as contemplated by this Agreement.

                           (c)  The   Subject   Shares   and  the   certificates
         representing  such Shares are now held by Stockholder,  or by a nominee
         or custodian for the benefit of such Stockholder, free and clear of all
         liens, claims, security interests or other encumbrances.

                                        4

<PAGE>



               5.  Representations  and Warranties of Parent.  Parent represents
and warrants to Stockholder as follows:

                           (a)  Parent  has  the  legal   capacity,   power  and
         authority to enter into and perform all of Parents's  obligations under
         this  Agreement.  The  execution,  delivery  and  performance  of  this
         Agreement by Parent has been duly authorized by all requisite corporate
         action  and does not  violate  Parent's  charter,  bylaws  or any other
         instrument or agreement or any law,  regulation or order  applicable to
         Parent or its assets. This Agreement has been duly and validly executed
         and delivered by Parent and  constitutes a valid and binding  agreement
         of Parent, enforceable against Parent in accordance with its terms.

                           (b)  Parent  has  the  legal   capacity,   power  and
         authority to enter into and perform all of Parents's  obligations under
         the  Registration  Rights  Agreement.   The  execution,   delivery  and
         performance  of the  Registration  Rights  Agreement by Parent has been
         duly authorized by all requisite  corporate action and does not violate
         Parent's  charter,  bylaws or any other  instrument or agreement or any
         law,  regulation or order applicable to Parent or its assets.  Upon the
         due  and  valid  execution  and  delivery  of the  Registration  Rights
         Agreement by the parties  thereto,  the  Registration  Rights Agreement
         shall constitute a valid and binding  agreement of Parent,  enforceable
         against Parent in accordance with its terms.

                  6. Termination. This Agreement shall terminate as follows:

                           (a)   By   Stockholder.   The   obligations   of  the
         Stockholder  hereunder  shall  terminate  upon the  earlier  of (i) the
         Effective Time or (ii) the termination of the Reorganization  Agreement
         pursuant to Section 8.1 thereof.

                           (b) By Parent.  The  obligations of Parent  hereunder
         shall terminate in the event of the  termination of the  Reorganization
         Agreement pursuant to Section 8.1.

                  7. Further Assurances.  Stockholder and Parent will, from time
to time,  execute and  deliver,  or cause to be  executed  and  delivered,  such
additional or further consents,  proxies, documents and other instruments as the
other may  reasonably  request for the purpose of  effectively  carrying out the
transactions contemplated by this Agreement.

                  8. Successors,  Assigns and Transferees  Bound. This Agreement
shall be binding upon the  successors,  assigns and  transferees  of the parties
hereto,  and the  parties  hereto  shall take any and all actions  necessary  to
obtain the written confirmation from any such successor,  assignee or transferee
that it is bound by the

                                        5

<PAGE>



terms hereof.

                  9. Remedies. Each party hereto acknowledges that money damages
would be both  incalculable  and an  insufficient  remedy for any breach of this
Agreement  by it,  and  that  any  such  breach  would  cause  the  other  party
irreparable harm. Accordingly, each party agrees that in the event of any breach
or  threatened  breach of this  Agreement,  the other party,  in addition to any
other remedies at law or in equity it may have,  shall be entitled,  without the
requirement of posting a bond or other security, to equitable relief,  including
injunctive relief and specific performance.

                  10.  Submission  to  Jurisdiction.  Each party  hereto  hereby
irrevocably  submits in any suit, action or proceeding arising out of or related
to this Agreement or any of the transactions  contemplated  hereby or thereby to
the exclusive  jurisdiction of the United States District Court for the District
of Delaware  and the  jurisdiction  of the courts of the State of  Delaware  and
waive any and all objections to  jurisdiction  that they may have under the laws
of the State of Delaware or the United  States and any claim or  objection  that
any such court is an inconvenient forum.

                  11.  Severability.  The invalidity or  unenforceability of any
provision of this Agreement in any jurisdiction shall not affect the validity or
enforceability of any other provision of this Agreement in such jurisdiction, or
the validity or  enforceability  of any provision of this Agreement in any other
jurisdiction.

                  12. Amendment.  This Agreement may be amended only by means of
a written  instrument  executed  and  delivered by each of the  Stockholder  and
Parent.

                  13.      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 APPLICABLE PRINCIPLES OF CONFLICTS OF LAWS.

                  14.  Counterparts.  For the  convenience of the parties,  this
Agreement  may be  executed  in  counterparts,  each of which shall be deemed an
original,  but  all  of  which  together  shall  constitute  one  and  the  same
instrument.

                  15. Notices.  All notices and other  communications  hereunder
shall be in writing and shall be deemed given if delivered  personally,  sent by
overnight   courier   (providing  proof  of  delivery)  or  telecopied  (with  a
confirmatory  copy sent by  overnight  courier) to the parties at the  following
addresses  (or at such other  address for a party as shall be  specified by like
notice):


                                        6

<PAGE>



                  (a)  if to Parent, to

                           VoiceStream Wireless Corporation
                           3650 131st Avenue SE, Suite 400
                           Bellevue, WA  98006
                           Attn:  General Counsel
                           Telecopy No.:   425-586-8080

         with a copy to:

                           Preston Gates, & Ellis LLP
                           5000 Columbia Center
                           701 Fifth Avenue
                           Seattle, WA  98104
                           Attn:  Richard B. Dodd, Esq.
                           Telecopy No:    206-623-7022

         (b)  if to the Stockholder, to:

                           Telephone and Data Systems, Inc.
                           30 North LaSalle, Suite 4000
                           Chicago, Illinois  60602
                           Attn:  Chairman
                           Telecopy No.:  312-853-9299

                  with a copy to:

                           Sidley & Austin
                           One First National Plaza
                           Chicago, Illinois  60603
                           Attention: Michael G. Hron, Esq.
                           Facsimile No.:  312-853-7036

                                   * * * * * *

                                        7

<PAGE>




                  IN WITNESS WHEREOF,  the parties have signed this Agreement as
of the date noted above.



                                               TELEPHONE AND DATA SYSTEMS, INC.


                                               By:  /s/  LeRoy T.  Carlson,  Jr.
                                                   -----------------------------
                                               Name:   LeRoy  T.  Carlson,   Jr.
                                               Title: President




                                               VOICESTREAM WIRELESS CORPORATION


                                               By: /s/ Cregg B. Baumbaugh
                                                  -----------------------------
                                               Name:   Cregg   B.    Baumbaugh
                                               Title:  Executive Vice President
                                               Strategy, Finance and Development



                                               VOICESTREAM    WIRELESS   HOLDING
                                               CORPORATION


                                               By: /s/ Cregg B. Baumbaugh
                                                  ----------------------------
                                               Name: Cregg B. Baumbaugh
                                               Title: Executive Vice President -
                                               Strategy, Finance and Development









                     SIGNATURE PAGE TO STOCKHOLDER AGREEMENT

                                        8

<PAGE>




                                                                    Exhibit 99.4




                              INDEMNITY AGREEMENT


                  This  INDEMNITY  AGREEMENT (the  "Agreement"),  is dated as of
September  17,  1999,  among  VOICESTREAM  WIRELESS  CORPORATION,  a  Washington
corporation   ("VoiceStream"),   VOICESTREAM  WIRELESS  HOLDING  CORPORATION,  a
Delaware  corporation  ("Holding"),  (VoiceStream  and Holding  are  hereinafter
referred to collectively as "Parent"),  AERIAL COMMUNICATIONS,  INC., a Delaware
corporation  (the  "Company"),   AERIAL  OPERATING  COMPANY,  INC.,  a  Delaware
corporation  ("Operating  Company"),  and TELEPHONE  AND DATA  SYSTEMS,  INC., a
Delaware corporation ("TDS").


                              W I T N E S S E T H:

                  WHEREAS,  the Company,  Parent and VoiceStream  Subsidiary III
Corporation,  a Delaware  corporation  and a  wholly-owned  subsidiary of Parent
("Sub"),  are parties to that certain Agreement and Plan of Reorganization dated
the date hereof (the  "Reorganization  Agreement"),  providing  for, among other
things,  the merger (the  "Merger") of Sub with and into the  Company,  with the
Company  surviving  as  a  wholly-owned  subsidiary  of  Parent  (as  such,  the
"Surviving Corporation");

                  WHEREAS,  on June 1, 1998,  TDS,  the  Company  and  Operating
Company entered into a Purchase Agreement (the "Purchase Agreement") with Sonera
Ltd., a limited  liability  company  organized under the laws of the Republic of
Finland ("Investor"), pursuant to which Investor agreed to purchase an aggregate
of  2,410,482  shares  (the  "Purchased  Shares") of common  stock of  Operating
Company  ("Operating  Company  Shares")  for  an  aggregate  purchase  price  of
$200,000,000 (the "Purchase Price");

                  WHEREAS, on August 31, 1998, in anticipation of the closing of
the Purchase  Agreement,  (1) TDS and Operating Company entered into a Revolving
Credit  Agreement  (the  "Revolving  Credit  Agreement");  and (2)  the  Company
executed a Guaranty,  dated as of August 31, 1998 (the "Company  Guaranty"),  in
favor of TDS;

                  WHEREAS,  on September 8, 1998 (the "Investor  Closing Date"),
the parties  consummated  the closing of the  Purchase  Agreement  by taking the
following  actions:  (1) Investor  purchased the Purchased Shares from Operating
Company in  consideration  for the transfer by Investor to Operating  Company of
the Purchase Price; (2) Investor, TDS, the Company and Operating Company entered
into an Investment Agreement (the "Investment Agreement");  (3) Investor and the
Company entered into a Registration Rights

                                        1

<PAGE>



Agreement (the "Investor Registration Rights Agreement");  (4) Investor, TDS and
the Company  entered  into a side letter (the  "Management  Side  Letter");  (5)
Sonera Corporation U.S., a Delaware  corporation and wholly-owned  subsidiary of
Investor ("Sonera U.S."), the Company and Operating Company entered into a Joint
Venture Agreement (the "Joint Venture Agreement"); (6) Investor, the Company and
Operating  Company  entered into a  Supplemental  Agreement  (the  "Supplemental
Agreement");  and (7) TDS, the Company and Operating  Company entered into a Tax
Allocation  Agreement (the "Tax Allocation  Agreement") (the Purchase Agreement,
Investment Agreement,  Investor  Registration Rights Agreement,  Management Side
Letter,  Joint  Venture  Agreement,   Supplemental  Agreement,   Tax  Allocation
Agreement,  Revolving  Credit  Agreement and Company  Guaranty  being  hereafter
collectively referred to as the "Investor Arrangements");

                  WHEREAS,   following  the  Investor  Closing  Date,   Investor
asserted that the Company and TDS  misrepresented and failed to disclose certain
material facts to Investor,  thereby  inducing it to pay an excessive  price for
the Operating Company Shares,  and has requested that certain  provisions of the
Investor  Arrangements  be  renegotiated,  including the Purchase  Price for the
Operating  Company  Shares,  and has raised the  possibility  of  litigation  in
connection therewith;

                  WHEREAS, under the Purchase Agreement, the number of Operating
Company  Shares  purchased  by Investor is subject to  reduction  if the average
price of the Company Common Shares exceeds certain threshold prices;

                  WHEREAS,  as of July 7, 1999, the average price of the Company
Common  Shares  exceeded all of the  threshold  prices set forth in the Purchase
Agreement  and,  pursuant to the Purchase  Agreement,  the Company has requested
that  Investor  surrender  for  cancellation  an aggregate of 634,216  Operating
Company Shares (the "Cancelled Shares");

                  WHEREAS,  Investor  has  refused to  surrender  the  Cancelled
Shares and has objected to the  application  of such  adjustments  in connection
with the assertions that it has made;

                  WHEREAS,  TDS, the Company,  and Operating  Company  expressly
deny that they have any liability to Investor in connection  with the assertions
made by Investor with respect to the Investor  Arrangements  or  otherwise,  and
deny that Investor has any right to refuse to surrender the Cancelled Shares;

                  WHEREAS,  as a condition of entering  into the  Reorganization
Agreement, Parent has required that Parent and its Affiliates be indemnified and
held harmless with respect to any Claims by Investor; and

                  WHEREAS, TDS has agreed to indemnify Parent and its Affiliates
pursuant to the terms of this Agreement;

                                        2

<PAGE>



                  NOW,  THEREFORE,  in  consideration of the mutual promises and
covenants herein contained, the parties hereto agree as follows:

Section 1.  Definitions.

                  "Affiliate"  when used with  respect  to a  specified  Person,
shall mean another  Person that  controls,  is controlled by, or is under common
control with the Person  specified.  As used in this Agreement,  "control" means
the  possession,  directly  or  indirectly,  of the power to direct or cause the
direction of the  management  and policies of such Person,  whether  through the
ownership of voting securities or other interests, by contract or otherwise.

                  "Claim" shall mean any demand,  action,  claim,  counterclaim,
cross-claim, cause of action, or lawsuit existing now or in the future, asserted
by an Investor Group Member against any Potential Party, whether currently known
or unknown,  accrued or  unaccrued,  foreseen or  unforeseen,  arising out of or
resulting  from  any  alleged  act or  failure  to act  occurring  prior  to the
Effective Time.  Notwithstanding anything to the contrary in this Agreement, the
definition of "Claim": (a) is intended to include any Claim by an Investor Group
Member with respect to (i) any asserted right of an Investor Group Member to the
Cancelled  Shares,  or (ii) in  connection  with the  exercise of the  tag-along
rights  pursuant to Section 10.6 of the  Investment  Agreement  (the  "Tag-Along
Rights") with respect to the Operating  Company  Shares owned by Investor on the
date hereof, any asserted right of an Investor Group Member to receive shares of
Company Common Stock in excess of the number of shares  indicated in the Company
Letter to which  Investor is entitled upon the exercise of the Tag-Along  Rights
with  respect to such  Operating  Company  Shares;  and (b) is not  intended  to
include  any Claim by an Investor  Group  Member  with  respect to the  Investor
Agreement  to be  executed  among  Investor,  Holding  and  Wireless,  the Stock
Subscription  Agreement  to be  executed  between  Investor  and  Holding or the
Registration  Rights Agreement to be executed  between Investor and Holding,  in
each case to be dated on or about the date hereof.

                  "Dispute" shall have the meaning set forth in Section 4.1.

                  "Indemnity Claim"   shall  have  the   meaning  set  forth  in
Section 2.2.

                  "Indemnity  Claim  Notice" shall have the meaning set forth in
Section 2.2.

                  "Indemnity  Claim  Notice  Termination  Date"  shall  have the
meaning set forth in Section 2.3(a).

                  "Investor  Arrangements"  shall have the  meaning set forth in
the recitals to this Agreement.

                  "Investor  Group Member" shall mean Investor,  Sonera U.S. and
their parents,

                                        3

<PAGE>



Subsidiaries  and  Affiliates,  and their  respective  successors  and permitted
assigns.

                  "Loss" or "Losses" shall mean any loss,  liability,  judgment,
settlement payment, damage, fee, cost or expense (including interest, penalties,
and the reasonable fees,  disbursements  and expenses of attorneys,  accountants
and other professional  advisors) imposed on or incurred by a Parent Indemnitee,
resulting  from or arising  out of either:  (i) a Claim  asserted by an Investor
Group Member  against  such Parent  Indemnitee;  or (ii) a claim  asserted by an
officer, director,  employee or agent of a Parent Indemnitee against such Parent
Indemnitee for  indemnification  with respect to a Claim asserted by an Investor
Group Member against such officer, director,  employee or agent, but only to the
extent that such Parent Indemnitee determines in good faith that indemnification
of such officer, director, employee or agent with respect thereto is required by
the  applicable  indemnification  provisions  set  forth in the  certificate  or
articles  of  incorporation  or  bylaws  of  such  Parent  Indemnitee  or by the
applicable  corporation  law of the state in which  such  Parent  Indemnitee  is
incorporated.  Notwithstanding  anything to the contrary in this Agreement,  the
definition of "Loss": (a) is intended to include any Loss imposed on or incurred
by a Parent  Indemnitee  with respect to (i) any  asserted  right of an Investor
Group Member to the Cancelled Shares, or (ii) in connection with the exercise of
the Tag-Along  Rights pursuant to Section 10.6 of the Investment  Agreement with
respect to the  Operating  Company  Shares owned by Investor on the date hereof,
any  asserted  right of an Investor  Group  Member to receive  shares of Company
Common Stock in excess of the number of shares  indicated in the Company  Letter
to which  Investor is entitled  upon the exercise of the  Tag-Along  Rights with
respect to such Operating Company Shares; and (b) is not intended to include any
Loss imposed on or incurred by a Parent  Indemnitee with respect to the Investor
Agreement  to be  executed  among  Investor,  Holding  and  Wireless,  the Stock
Subscription  Agreement  to be  executed  between  Investor  and  Holding or the
Registration  Rights Agreement to be executed  between Investor and Holding,  in
each case to be dated on or about the date hereof.

                  "Parent  Indemnitees"  shall  have the  meaning  set  forth in
Section 2.1.

                  "Potential  Party"  or  "Potential  Parties"  shall  mean  the
Company,   Operating  Company,   Parent,   each  of  their  respective  parents,
Subsidiaries and Affiliates,  each of their respective  successors and permitted
assigns, and each of their respective officers, directors, employees and agents.

                  All other  capitalized  terms used but not  otherwise  defined
herein shall have the meanings set forth in the Reorganization Agreement.

Section 2.  Indemnification of Parent

         2.1  Indemnification.  Except as otherwise  provided herein,  TDS shall
defend,  indemnify,  hold harmless,  and reimburse Parent and its  Subsidiaries,
including  the  Company  and its  Subsidiaries,  and  each of  their  respective
Affiliates, successors and

                                        4

<PAGE>



permitted assigns (collectively, the "Parent Indemnitees"), from and against any
Claim or Loss  imposed  on or  incurred  by  Parent  Indemnitees  in the  manner
provided in this Agreement.


         2.2      Notice and Payment of Indemnity Claim by TDS.

                  (a) Parent  shall give prompt  written  notice (an  "Indemnity
         Claim  Notice")  to TDS on  behalf  of any  Parent  Indemnitee  seeking
         indemnification  hereunder  of any Claim or Loss with  respect to which
         the Parent Indemnitee seeks to be indemnified (the "Indemnity  Claim").
         Such  Indemnity  Claim Notice  shall state the nature of the  Indemnity
         Claim and the amount of any Claim,  if known,  or Loss. With respect to
         an Indemnity Claim Notice  delivered to TDS in connection with a Claim,
         TDS shall, subject to paragraph (b) hereof,  assume the defense thereof
         pursuant to Section  3.1.  With  respect to an  Indemnity  Claim Notice
         delivered  to TDS in  connection  with a Loss,  TDS  shall,  subject to
         paragraph (b) hereof,  promptly  reimburse  Parent with respect to such
         Loss.

                  (b) If TDS  does  not  agree  that the  Parent  Indemnitee  is
         entitled  to  indemnification  with  respect  to any such Claim or Loss
         hereunder,  TDS shall give  prompt  notice to Parent  and such  dispute
         shall be  resolved  in the manner  described  in Section 4 hereof.  TDS
         shall be  required to give such notice to Parent no later than the date
         (the "TDS Response Date")  occurring ten (10) days prior to the date on
         which any action is required to be taken by any Parent  Indemnitee with
         respect  to any  Claim or Loss,  provided  that  each of the  following
         conditions  is  satisfied:  (1)  the  Indemnity  Claim  Notice  clearly
         identifies  such  TDS  Response  Date;  and  (2)  Parent  provides  the
         Indemnity  Claim  Notice  to TDS  sufficiently  in  advance  of the TDS
         Response Date to enable TDS to adequately  assess the Claim or Loss and
         reach a  determination  regarding the  obligations  of TDS with respect
         thereto,  taking into account the time at which Parent  became aware of
         the Claim or Loss.

         2.3      Limitations.  Notwithstanding anything to the contrary herein:

                  (a) TDS shall not have any liability to any Parent  Indemnitee
         under this  Agreement  or  otherwise  for any Claim or Loss thirty (30)
         days after the expiration of all statutes of limitations  applicable to
         such Claim or Loss (the  "Indemnity  Claim Notice  Termination  Date"),
         except to the  extent  that such Claim or Loss  results  from a lawsuit
         filed or arbitration  proceeding  commenced by an Investor Group Member
         against a  Potential  Party of which TDS  receives an  Indemnity  Claim
         Notice  pursuant to Section  2.2 prior to the  Indemnity  Claim  Notice
         Termination Date.

                  (b) This  Agreement  shall  serve  as the  sole and  exclusive
         remedy,  and  shall be in lieu of any  other  right or  remedy,  of any
         Parent  Indemnitee for Claims or Losses and for any other claims by any
         Parent Indemnitee  against TDS and its  Subsidiaries,  and any of their
         respective  Affiliates,   officers,   directors,   employees,   agents,
         successors and permitted assigns, in any way relating to the Investor

                                        5

<PAGE>



         Arrangements.

Section 3.  Responsibilities and Duties of Parties.

         3.1 Control of Litigation or Settlement of Claim.

                  (a) Subject to the  provisions  in Sections  3.1(b) and 3.1(c)
         hereof,  TDS shall have the sole right and  obligation  to conduct  and
         control, on behalf of any and all Potential Parties,  the litigation or
         settlement  of any  Claim,  including  the  assumption  of the  defense
         thereof,  the  choosing  and hiring of counsel  and the  payment of all
         associated fees and expenses.

                  (b) Parent, on behalf of the Potential Parties, shall have the
         right to employ  separate  counsel and to monitor (but not control) the
         litigation of any Claim,  but the fees and expenses of monitoring  such
         litigation,  including the fees and expenses of such separate  counsel,
         shall be at the expense of Parent; provided, however, that Parent shall
         be  entitled  to be  indemnified  by TDS for its fees and  expenses  of
         counsel if each of the following  conditions is satisfied:  (1) TDS has
         given notice pursuant to Section 2.2 hereof asserting that TDS does not
         agree that a Parent  Indemnitee  is  entitled to  indemnification;  (2)
         Parent has promptly  submitted such dispute for resolution  pursuant to
         Section  4  hereof,  provided  that  Parent  shall  be  deemed  to have
         satisfied  this condition by giving notice of a dispute to TDS; and (3)
         it is  ultimately  determined  pursuant  to Section 4 hereof  that such
         Parent  Indemnitee  is  entitled to  indemnification  by TDS under this
         Agreement.

                  (c) Notwithstanding anything to the contrary in the Agreement,
         in the event that an action or  proceeding  is  brought by an  Investor
         Group Member against a Potential Party which includes both a Claim and,
         separately  or as a part  of the  Claim,  a  cause  of  action,  claim,
         counterclaim  or cross-claim  against a Potential  Party which is not a
         Claim as defined herein (an "Unindemnified Cause"), then TDS shall have
         the right,  but not the obligation,  to conduct and control the defense
         of such action or proceeding in its entirety on behalf of the Potential
         Parties.  In the event  that TDS  elects to  conduct  and  control  the
         defense  of such  action  or  proceeding  on  behalf  of the  Potential
         Parties,  TDS shall be solely  responsible  for the payment of the fees
         and expenses of the litigation  counsel or any experts retained for the
         litigation  together with other litigation costs. In the event that TDS
         elects  not to  conduct  and  control  the  defense  of such  action or
         proceeding on behalf of the Potential  Parties,  then Parent shall have
         the  obligation  to conduct  and  control  the defense of the action or
         proceeding  on  behalf  of the  Potential  Parties  and shall be solely
         responsible  for  payment of the fees and  expenses  of the  litigation
         counsel or any experts retained for the litigation  together with other
         litigation  costs.  Regardless  of whether  TDS  elects to conduct  and
         control  on behalf of  Potential  Parties  the  defense of an action or
         proceeding that is subject to this Section 3.1(c), TDS and Parent agree
         that the responsibility for any damages award, other

                                        6

<PAGE>



         monetary  judgment  or  settlement  obligation  incurred  by  a  Parent
         Indemnitee as a result of such an action or proceeding  subject to this
         Section  3.1(c)  shall be  allocated  between TDS and Parent  either by
         agreement of the parties or, in the absence of such agreement, pursuant
         to the  arbitration  provisions  set  forth  in  Section  4.4  of  this
         Agreement,  based on an assessment and  determination  of the amount of
         the damages  award,  other monetary  judgment or settlement  obligation
         incurred by a Parent  Indemnitee  attributable to the Claim compared to
         the amount of the damages award,  other monetary judgment or settlement
         obligation  incurred  by  the  Parent  Indemnitee  attributable  to  an
         Unindemnified Cause.

                  (d)    Anything   in   this    Agreement   to   the   contrary
         notwithstanding,  TDS  shall  have the sole  right,  without  the prior
         consent of any Potential  Party,  to settle or compromise  any Claim or
         consent to the entry of any  judgment  with respect to any Claim unless
         such  settlement,  compromise or judgment imposes a criminal penalty or
         equitable  remedy on or with  respect  to such  Potential  Party,  or a
         non-monetary condition or obligation which could reasonably be expected
         to have a material adverse effect on the ongoing business operations of
         a Potential  Party.  No Potential  Party shall settle or compromise any
         Claim  without the prior written  consent of TDS,  which consent may be
         withheld at the sole  discretion  of TDS;  provided  that, in the event
         that such Claim is the subject of a dispute regarding the obligation of
         TDS to provide indemnification pursuant to Section 2.2(b) hereof and it
         is ultimately  determined  pursuant to Section 4 hereof that TDS is not
         obligated to provide such indemnification, then such consent may not be
         unreasonably withheld by TDS.

                  (e) Each  Potential  Party shall  reasonably  cooperate in all
         respects  with  TDS in  all  matters  relating  to  the  litigation  or
         settlement of any Claim, including without limitation, making documents
         and  witnesses  reasonably  available  to  TDS,  entering  into a joint
         defense  agreement,  and  taking  all  such  other  actions  as TDS may
         reasonably  request to enable it to prepare for,  conduct,  and control
         any litigation or potential litigation relating to such Claim.

                  (f)   Notwithstanding   anything  to  the   contrary  in  this
         Agreement,  but subject to the provisions of Section 3.1(b) hereof,  if
         for any reason TDS is prevented by any Potential  Party,  or any Person
         purporting  to  act on  behalf  of any of  them,  from  conducting  and
         controlling  in a material  manner the defense of any Claim,  including
         without  limitation  the failure of a Potential  Party to fully  comply
         with Section 3.1(e) hereof,  TDS shall,  at its sole election,  have no
         obligations  under this  Agreement  to any party  with  respect to such
         Claim or any Loss incurred in connection therewith. The right of TDS to
         make the election  provided for in this Section  3.1(f) with respect to
         such  Claim  or  Loss  shall  be  subject  to  the  dispute  resolution
         provisions of Section 4 hereof.

                  3.2  Authority  of  TDS.  Not in  limitation  of  the  general
authority granted to TDS

                                        7

<PAGE>



pursuant  to  Section  3.1  but  subject  to all  limitations  included  in this
Agreement,  TDS shall have full power and  authority on behalf of all  Potential
Parties (i) to take all actions  which TDS  considers  necessary or desirable in
connection  with the defense,  pursuit or settlement of any Claim,  including to
arbitrate, sue, defend, claim,  counterclaim,  cross-claim,  negotiate,  settle,
compromise  and  otherwise  handle any such  dispute  or claim,  and to amend or
terminate any of the Investor Arrangements, (ii) to engage and employ agents and
representatives  (including accountants,  legal counsel and other professionals)
and to incur  such  other  expenses  as it shall  deem  necessary  or prudent in
connection with the administration of the foregoing, and (iii) to take all other
actions and exercise all other rights which TDS in its sole discretion considers
necessary or  appropriate in connection  with the  foregoing.  All decisions and
acts by TDS  within  the  scope of  Section  3.1 and this  Section  3.2 shall be
binding upon all of the Potential Parties.

         3.3 No Admission. Neither this Agreement nor any of the negotiations in
connection  herewith or any prior negotiations or discussions shall be construed
as or deemed to be an admission of the truth of any  allegation  or the validity
of any claim by any Investor Group Member against TDS or any Potential  Party or
by TDS or any Potential  Party against any other  Potential Party or TDS or used
in any  other  proceeding  except  one  brought  to  enforce  the  terms of this
Agreement.

Section 4.  Resolution of Disputes Relating to this Agreement.

         4.1 Informal Dispute  Resolution.  Subject to Section 4.5, any dispute,
controversy,  claim or disagreement between TDS, on the one hand, and any Parent
Indemnitee,  on the other hand, arising from,  relating to or in connection with
this Agreement,  including questions  regarding the  interpretation,  meaning or
performance  of the  Agreement,  and including  claims based on contract,  tort,
common law, equity, statute, regulation, order or otherwise ("Dispute") shall be
resolved in accordance with this Section 4.

         4.2 Level 1 Review.  Upon written request of either TDS or Parent, each
of TDS, on its own behalf, and Parent, on behalf of itself and each other Parent
Indemnitee,  shall appoint a designated  representative whose task it will be to
meet within twenty days for the purpose of  endeavoring  to resolve such Dispute
("Level 1 Review").  The designated  representatives  shall meet as often as the
parties  reasonably  deem necessary to discuss the Dispute and negotiate in good
faith in an effort to resolve the Dispute  without the  necessity  of any formal
proceeding.

         4.3  Mediation.  If the Dispute  cannot be resolved  within thirty days
after the first Level 1 Review  meeting  ("Level 1 Termination  Date"),  TDS and
Parent shall submit the Dispute to mediation in accordance  with the  Commercial
Mediation Rules of the American  Arbitration  Association ("AAA") and shall bear
equally  the costs of the  mediation.  TDS and Parent  will act in good faith to
jointly  appoint a mutually  acceptable  mediator,  seeking  assistance  in such
regard from the AAA within thirty days of the Level 1 Termination Date.

                                        8

<PAGE>



TDS  and  Parent  agree  to  participate  in good  faith  in the  mediation  and
negotiations  related  thereto for a period of thirty  calendar days  commencing
with the  selection of the mediator and any extension of such period as mutually
agreed to by TDS and Parent.


         4.4      Arbitration.

                  (a) If TDS and Parent cannot agree to a mediator within thirty
         calendar days after the Level 1  Termination  Date or if the Dispute is
         not resolved  within  thirty  calendar  days after the beginning of the
         mediation  and any  extension of such periods as mutually  agreed to by
         TDS and  Parent,  the  Dispute  shall  be  submitted  to,  and  finally
         determined  by, binding  arbitration  in accordance  with the following
         provisions of this Section 4.4, regardless of the amount in controversy
         or whether such Dispute would  otherwise be considered  justiciable  or
         ripe for resolution by a court or arbitration panel.

                  (b) Any  such  arbitration  shall be  conducted  by the AAA in
         accordance with its current  Commercial Rules ("AAA Rules"),  except to
         the extent  that the AAA Rules  conflict  with the  provisions  of this
         Agreement,  in which  event  the  provisions  of this  Agreement  shall
         control.

                  (c) The arbitration panel (the "Panel") shall consist of three
         neutral arbitrators ("Arbitrators"),  each of whom shall be an attorney
         having  ten or  more  years  experience,  and  shall  be  appointed  in
         accordance with the AAA Rules (the "Basic Qualifications").

                  (d) Should an  Arbitrator  refuse or be unable to proceed with
         arbitration  proceedings as called for by this Agreement,  a substitute
         Arbitrator  possessing the Basic  Qualifications  shall be appointed by
         the AAA. If an Arbitrator is replaced after the arbitration hearing has
         commenced,  then a rehearing  shall take place in  accordance  with the
         provisions of this Agreement and the AAA Rules.

                  (e) The arbitration shall be conducted in Denver, Colorado, or
         in such  other  location  as TDS and  Parent  may  designate  by mutual
         written  consent;  provided,  that  the  Panel  may  from  time to time
         convene,  carry on hearings,  inspect  property or  documents  and take
         evidence at any location which the Panel deems appropriate.

                  (f) The Panel may in its discretion  order a  pre-exchange  of
         information including production of documents, exchange of summaries of
         testimony or exchange of  statements  of position,  and shall  schedule
         promptly all discovery and other  procedural steps and otherwise assume
         case  management  initiative  and  control to effect an  efficient  and
         expeditious resolution of the Dispute.


                                        9

<PAGE>



                  (g) At any oral  hearing of  evidence in  connection  with any
         arbitration  conducted  pursuant  to  this  Agreement,  each of TDS and
         Parent  and their  respective  legal  counsel  shall  have the right to
         examine their own witnesses and to  cross-examine  the witnesses of the
         other party.  No testimony of any witness shall be presented in written
         form  unless  the  opposing   party  shall  have  the   opportunity  to
         cross-examine such witness, except as TDS and Parent otherwise agree in
         writing and except  under  extraordinary  circumstances  where,  in the
         opinion of the Panel,  the  interests  of justice  require a  different
         procedure.

                  (h)  Within  thirty  calendar  days  after the  closing of the
         arbitration  hearing, the Panel shall prepare and distribute to TDS and
         Parent a written award,  setting forth the Panel's findings of fact and
         conclusions  of law relating to the Dispute,  including the reasons for
         the giving or denial of any requested remedy or relief. The Panel shall
         have the  authority  to award  any  remedy  or  relief  that a court of
         competent  jurisdiction  could order or grant, and shall award interest
         on any  monetary  award  from the date  that  the loss or  expense  was
         incurred by the successful party. In addition, the Panel shall have the
         authority to decide issues relating to the  interpretation,  meaning or
         performance  of this  Agreement  or the  relationships  of the  parties
         hereunder,  even if such decision would  constitute an advisory opinion
         in a court  proceeding or if the issues would otherwise not be ripe for
         resolution in a court proceeding,  and any such decision shall bind the
         parties in their  performance  of this  Agreement.  The decision of the
         arbitrators as to the validity and amount of any Indemnity  Claim shall
         be binding and conclusive.

                  (i) Except as necessary in court  proceedings  to enforce this
         arbitration  provision  or an award  rendered  hereunder,  or to obtain
         interim relief, or as provided in Section 4.5, or as otherwise required
         by law  (including  the  federal  securities  laws and the rules of any
         applicable securities  exchange),  neither any party nor any arbitrator
         shall  disclose the  existence,  content or results of any  arbitration
         conducted  hereunder  without  the prior  written  consent of the other
         parties.

                  (j) To the  extent  that the  relief or remedy  granted  in an
         award  rendered  by the  Panel is  relief  or a remedy on which a court
         could enter  judgment,  a judgment upon the award rendered by the Panel
         may be entered in any court having jurisdiction thereof. Otherwise, the
         award  shall  be  binding  on the  parties  in  connection  with  their
         obligations  under this Agreement and in any subsequent  arbitration or
         judicial proceedings among any of the parties.

                  (k) The prevailing party in any arbitration  shall be entitled
         to an award of reasonable  attorneys' fees and costs,  and all costs of
         arbitration shall be paid by the losing party,  subject in each case to
         a determination  by the Panel as to which party is the prevailing party
         and the amount of such fees and costs to be  allocated  to such  party,
         taking  into   consideration  the  relative  merits  of  the  positions
         advocated by each party in such arbitration proceeding.

                                       10

<PAGE>



                  (l)  Notwithstanding  the choice of law provision set forth in
         Section 6.4, The Federal  Arbitration  Act, 9 U.S.C.  Sections 1 to 14,
         except  as  modified  hereby,   shall  govern  the  interpretation  and
         enforcement of this Agreement.

         4.5 Recourse to Courts and Other Remedies.  Notwithstanding the Dispute
resolution procedures contained in Sections 4.1, 4.2, 4.3 and 4.4, any party may
apply  to any  court  having  jurisdiction  (i) to  enforce  this  agreement  to
negotiate,  mediate and arbitrate, (ii) to seek provisional injunctive relief so
as to  maintain  the status quo until the  arbitration  award is rendered or the
Dispute is otherwise  resolved,  (iii) to avoid the expiration of any applicable
limitation  period,  (iv) to preserve a superior  position with respect to other
creditors or (v) to challenge or vacate any final judgment, award or decision of
the Panel that does not comport with the express provisions of this Agreement.

         4.6  Expenses.  Each of TDS and Parent  shall be  responsible  for such
party's costs and expenses related to such Dispute,  including  attorneys' fees,
except as otherwise set forth herein.


Section 5. Representations and Warranties. Each of the parties hereto represents
and warrants to each of the other parties  hereto that it is a corporation  duly
organized,  validly  existing  and in good  standing (to the extent such concept
exists)  under  the  laws  of its  jurisdiction  of  formation;  that it has the
corporate  power and  authority  to execute and deliver  this  Agreement  and to
perform its obligations hereunder; that the execution,  delivery and performance
of this  Agreement by it has been duly  authorized and approved by all necessary
corporate action;  that this Agreement  constitutes its legal, valid and binding
obligation,  enforceable  against it in accordance with its terms;  and that the
execution, delivery and performance of this Agreement by it will not result in a
breach of or loss of rights under or  constitute a default  under or a violation
of its  charter  or bylaws  or any trust  (constructive  or  other),  agreement,
judgment,  decree, order or other instrument to which it is a party or it or its
properties or assets may be bound.

Section 6.  Miscellaneous.

         6.1 Benefit; Successor and Assigns; Parties in Interest. This Agreement
shall be binding  upon and inure to the benefit of the parties  hereto and their
respective  successors and permitted  assigns but shall not be assignable by any
party hereto  without the written  consent of all of the other  parties  hereto;
provided,   however,  that  Parent  may  assign  its  rights  and  delegate  its
obligations  hereunder to any  successor  corporation  in the event of a merger,
consolidation or transfer or sale of all or substantially  all of Parent's stock
or assets. Nothing in this Agreement, expressed or implied, is intended or shall
be construed to confer upon any Person,  other than the parties hereto and their
successors and permitted assigns,  any right, remedy or claim under or by reason
of this Agreement.


                                       11

<PAGE>



         6.2      Termination.

                  (a) This Agreement shall be terminated  prior to the Effective
         Time on the occurrence of either of the following events:

                           (i)  the  mutual  written  agreement  of  each of the
                  parties hereto; or

                           (ii) the termination of the Reorganization  Agreement
                  pursuant to Section 8.1 thereof.

                  (b) This  Agreement  shall  terminate at the Effective Time if
         both of the following conditions are satisfied:

                           (i)  each  of  VoiceStream,   Holding,  the  Company,
                  Operating Company,  TDS, Investor and Sonera U.S. have entered
                  into the  Settlement  Agreement  and Release  currently  under
                  negotiation among the parties; and

                           (ii)  each  of  the  parties  thereto   executes  and
                  delivers the Bring-Down  Amendment  pursuant to Section 8.4 of
                  the Settlement Agreement and Release.

                  (c)  Following  the  Effective   Time,  this  Agreement  shall
         terminate on the occurrence of either of the following events:

                           (i)  the  mutual  written  agreement  of  each of the
                  parties hereto; or

                           (ii) the first  date on which  there has been a final
                  determination of all unresolved  Indemnity Claims set forth in
                  each  Indemnity  Claim  Notice  received  by TDS  prior to the
                  Indemnity  Claim Notice  Termination  Date and, if applicable,
                  payment thereof to Parent.

         6.3 Notices. All notices and other communications hereunder shall be in
writing and shall be deemed  given if  delivered  personally,  sent by overnight
courier  (providing proof of delivery) or telecopied  (with a confirmatory  copy
sent by overnight courier) to the parties at the following addresses (or at such
other address for a party as shall be specified by like notice):


                  If  to  any  Parent  Indemnitee  (including  the  Company  and
Operating Company after the Effective Time) to:

                  VoiceStream Wireless
                  3650 131st Avenue SE, Suite 400
                  Bellevue, WA 98006

                                       12

<PAGE>



                  Attention: General Counsel
                  Facsimile No.: (425) 586-8040

                  With copy to:

                  Preston Gates & Ellis LLP
                  5000 Columbia Center
                  701 Fifth Avenue
                  Seattle, WA 98104
                  Attention: Richard B. Dodd, Esq.
                  Facsimile No.: (206) 623-7022


                  If to  TDS  or  its  Affiliates  (including  the  Company  and
Operating Company prior to the Effective Time) to:

                  Telephone and Data Systems, Inc.
                  30 North LaSalle Street, Suite 4000
                  Chicago, IL 60602
                  Attention:  LeRoy T. Carlson, Chairman
                  Facsimile No.:  (312) 630-9299



                  With copy to:

                  Sidley & Austin
                  One First National Plaza
                  Chicago, IL  60603
                  Attention: Michael G. Hron, Esq.
                  Facsimile No.:  (312) 853-7036

or such  other  address  as any such  party  shall  designate  in writing to the
parties hereto.

         6.4 GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE  WITH  THE LAWS OF THE  STATE  OF  DELAWARE,  WITHOUT  REGARD  TO THE
PRINCIPLES OF CONFLICTS OF LAW THEREOF.

         6.5  Counterparts.  This  Agreement  may be  executed  in  two or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

         6.6 Headings.  The section headings contained in this Agreement are for
reference  purposes  only  and  shall  not  affect  in any  way the  meaning  or
interpretation of

                                       13

<PAGE>



this Agreement.

         6.7 Partial Invalidity.  Wherever possible, each provision hereof shall
be interpreted in such manner as to be effective and valid under applicable law,
but in case any one or more of the provisions  contained  herein shall,  for any
reason,  be held to be invalid,  illegal or unenforceable  in any respect,  such
provision shall be ineffective in the jurisdiction  involved to the extent,  but
only to the extent, of such invalidity,  illegality or unenforceability  without
invalidating the remainder of such invalid,  illegal or unenforceable  provision
or provisions or any other provisions  hereof,  unless such a construction would
be unreasonable.

         6.8 Entire Agreement;  Modification and Waiver. This Agreement together
with the Reorganization Agreement and the agreements contemplated thereby embody
the entire agreement and understanding  among the parties hereto with respect to
the  subject  matter  hereof  and  supersede  any and all prior  agreements  and
understandings relating to the subject matter hereof. No amendment, modification
or waiver of this Agreement shall be binding or effective for any purpose unless
it is made in a writing  signed by the party  against whom  enforcement  of such
amendment,  modification  or waiver is sought.  No course of dealing between the
parties  to this  Agreement  shall be deemed to  affect or to  modify,  amend or
discharge any provision or term of this  Agreement.  No delay by any party to or
any  beneficiary  of this  Agreement  in the  exercise  of any of its  rights or
remedies shall operate as a waiver thereof, and no single or partial exercise by
any party to or any  beneficiary  of this  Agreement of any such right or remedy
shall preclude any other or further exercise  thereof.  A waiver of any right or
remedy on any one  occasion  shall not be construed as a bar to or waiver of any
such right or remedy on any other occasion.

                                     * * * *



                                       14

<PAGE>



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

                                     TELEPHONE AND DATA SYSTEMS, INC.

                                     By:      /s/ LeRoy T. Carlson
                                           ---------------------------------
                                     Name:    LeRoy T. Carlson
                                     Title:   Chairman

                                     AERIAL COMMUNICATIONS, INC.


                                     By:      /s/ LeRoy T. Carlson, Jr.
                                        -----------------------------------
                                     Name:    LeRoy T. Carlson, Jr.
                                     Title:   Chairman

                                     AERIAL OPERATING COMPANY, INC.
                                     By:  /s/ Don W. Warkentin
                                        ----------------------------------
                                     Name:    Don W. Warkentin
                                     Title:   President

                                     VOICESTREAM WIRELESS CORPORATION

                                     By:  /s/ Cregg B. Baumbaugh
                                        --------------------------------
                                     Name:    Cregg B. Baumbaugh
                                     Title: Executive Vice President - Strategy,
                                            Finance and Development

                                     VOICESTREAM WIRELESS HOLDING
                                     CORPORATION

                                     By:  /s/ Cregg B. Baumbaugh
                                        --------------------------------------
                                     Name:    Cregg B. Baumbaugh
                                     Title:   Executive Vice President-Strategy,
                                              Finance and Development

                SIGNATURE PAGE TO INDEMNITY AGREEMENT RELATING TO
                      MERGER OF AERIAL COMMUNICATIONS INC.


                                       15

<PAGE>




                                                                    Exhibit 99.5


                        DEBT/EQUITY REPLACEMENT AGREEMENT

         THIS DEBT/EQUITY  REPLACEMENT AGREEMENT (the "Agreement"),  dated as of
September  17, 1999, is made by and among  TELEPHONE  AND DATA SYSTEMS,  INC., a
Delaware  corporation   ("TDS"),   AERIAL   COMMUNICATIONS,   INC.,  a  Delaware
corporation  (the  "Company"),   AERIAL  OPERATING  COMPANY,  INC.,  a  Delaware
corporation   ("Operating   Company"),   VOICESTREAM  WIRELESS  CORPORATION,   a
Washington  corporation   ("VoiceStream"),   and  VOICESTREAM  WIRELESS  HOLDING
CORPORATION,  a Delaware  corporation  ("Holding")  (Wireless  and Holding being
referred to herein collectively as "Parent").


                                    RECITALS:

         WHEREAS,  the  Company,  TDS,  Parent and  VoiceStream  Subsidiary  III
Corporation,  a Delaware  corporation  and a  wholly-owned  subsidiary of Parent
("Sub"),  are parties to that certain Agreement and Plan of Reorganization dated
the date hereof (the  "Reorganization  Agreement"),  providing  for, among other
things,  the merger  (the  "Merger")  of Sub with and into the  Company  and the
conversion of shares of Company Common Stock into shares of Parent Common Stock;

         WHEREAS,  TDS and Operating  Company are parties to a Revolving  Credit
Agreement  dated as of August  31,  1998,  as  amended  (the  "Revolving  Credit
Agreement");

         WHEREAS,  the obligations  ("Obligations")  of Operating Company to TDS
under  the  Revolving  Credit  Agreement  have been  fully  and  unconditionally
guaranteed  by the  Company  pursuant to a guaranty  dated  August 31, 1998 (the
"Revolving Credit Agreement Guaranty");

         WHEREAS,  as of the date  hereof,  Operating  Company  has  outstanding
indebtedness to TDS under the Revolving Credit Agreement in the principal amount
of $605,239,046;

         WHEREAS,  the  Reorganization  Agreement provides that TDS will acquire
Company  Common Shares and Company Series A Common Shares prior to the Effective
Time of the Merger in consideration  for the assignment to the Company by TDS of
a portion of the debt due by Operating Company to TDS under the Revolving Credit
Agreement (the "Debt/Equity Replacement");

         WHEREAS, pursuant to the Investment Agreement, dated as of September 8,
1998 (the "Investment Agreement"), among TDS, the Company, Operating Company and
Sonera Ltd.  ("Investor"),  the Company will acquire  Operating  Company  Shares
prior to the Effective  Time in  consideration  for the  assignment to Operating
Company by the Company

                                        1

<PAGE>



of such debt and, if applicable, cash from Investor;

         WHEREAS,  pursuant to the  Investment  Agreement,  Investor may acquire
Company  Common Shares and Operating  Company Shares prior to the Effective Time
by exercising certain subscription rights set forth therein;

         WHEREAS,  at the Effective Time, the Revolving Credit Agreement will be
amended  and  restated  as  provided   herein  and  all  remaining   Obligations
outstanding  to TDS after the  Debt/Equity  Replacement  under such  amended and
restated  Revolving Credit Agreement will mature on the first anniversary of the
Effective Time;

         WHEREAS,  such amended and restated  Revolving  Credit  Agreement  will
remain in effect until the repayment in full of such remaining  Obligations,  at
which  time  such  amended  and  restated  Revolving  Credit  Agreement  will be
terminated; and

         WHEREAS,  all capitalized  terms used but not otherwise  defined herein
shall have the meaning set forth in the Reorganization Agreement.

         NOW,  THEREFORE,  in  consideration of the foregoing and the respective
representations,  warranties,  covenants and  agreements  herein set forth,  and
subject to the conditions hereof, the parties hereto agree as follows:


Section 1.  The Transactions.


         1.1   Issuance of Company Shares in Connection with Assignment of Debt.

                  (a) On the tenth  Business  Day (as  defined in  Section  5.12
         hereof)  occurring after the execution of this  Agreement,  the Company
         shall  deliver to Investor a notice  pursuant to Section  9.1(a) of the
         Investment  Agreement (the "Section  9.1(a)  Notice"),  unless TDS, the
         Company, Operating Company and Investor shall agree in writing that the
         Section 9.1(a) Notice either may be delivered on a different date or is
         not required.

                  (b) Subject to the terms and conditions of this Agreement,  at
         and as of the First Closing (as defined herein), TDS shall acquire from
         the Company,  and the Company  shall issue and sell to TDS,  fully paid
         and   nonassessable   Company   Common   Shares   and  fully  paid  and
         nonassessable  Company Series A Common Shares (the "Company Shares") in
         exchange  for the  consideration  set  forth in  paragraph  (c) of this
         Section 1.1. The ratio of the number of Company Common Shares issued to
         TDS to the number of Company Series A Common Shares issued to TDS shall
         equal the ratio of the number of Company  Common Shares owned by TDS to
         the number of Company  Series A Common Shares owned by TDS,  determined
         as of the date of the Section 9.1(a) Notice.


                                        2

<PAGE>



                  (c) The  aggregate  purchase  price for the purchase by TDS of
         the Company Shares as contemplated in paragraph (b) of Section 1.1 (the
         "TDS Purchase  Price")  shall be determined in accordance  with Section
         1.3 hereof  and shall  represent  a purchase  price per share of $22.00
         (the "TDS Price Per Company  Share").  The TDS Purchase  Price shall be
         paid by the  assignment by TDS to the Company of  Obligations  equal to
         the  amount of the TDS  Purchase  Price (the  "Assigned  Obligations"),
         pursuant to an instrument in the form attached hereto as Exhibit 1 (the
         "First  Assignment and  Acceptance").  Effective as of such assignment,
         (1) the Assigned Obligations will cease to be evidenced and governed by
         the  Revolving  Credit  Agreement  and will  instead be  evidenced  and
         governed by a separate Credit  Agreement in the form attached hereto as
         Exhibit 2 (the "New Credit  Agreement")  and (2) the  Revolving  Credit
         Agreement  will  be  amended  pursuant  to a  Fourth  Amendment  to the
         Revolving  Credit  Agreement in the form  attached  hereto as Exhibit 3
         (the "Fourth Amendment").

                  (d) If Investor  elects to exercise  its  subscription  rights
         pursuant to Section 9.2 of the  Investment  Agreement (the "Section 9.2
         Subscription Rights"),  then the Company shall issue to Investor on the
         First  Closing Date (as defined  herein) that number of Company  Common
         Shares for which  Investor has subscribed  (the "Investor  Subscription
         Shares"),  subject to Section 4.5(c) of the Investment  Agreement,  and
         subject to the  receipt  of the  proceeds  from  Investor  as  required
         pursuant  to Section 9.2 of the  Investment  Agreement  (the  "Investor
         Proceeds").  The price per share of the  Investor  Subscription  Shares
         (the "Investor  Price Per Company Share") shall be equal to the average
         of the daily means of the high and low sales prices for Company  Common
         Shares as reported in The Wall Street  Journal (the  "Aerial  Average")
         for the five consecutive  trading day period ending on the last trading
         day prior to the date of the Section 9.1(a) Notice.

                  (e) If Investor  elects to exercise the AOC Option pursuant to
         Section 4.5 of the  Investment  Agreement  (as defined  therein),  then
         Operating  Company  shall issue to Investor on the First  Closing  Date
         that  number  of  Operating  Company  Shares  for  which  Investor  has
         subscribed (the "Investor AOC Option  Shares"),  subject to the receipt
         of the proceeds from Investor as required pursuant to Section 4.5(b) of
         the  Investment  Agreement (the  "Investor AOC Option  Proceeds").  The
         price per share of the Investor AOC Option Shares (the "Investor  Price
         Per AOC  Option  Share")  shall  be  equal  to the  product  of (1) the
         Exchange  Rate (as  determined  pursuant to the  Investment  Agreement)
         multiplied by (2) the Investor  Price Per Company Share (as  calculated
         pursuant to paragraph (d) of this Section 1.1.

                  (f)  Notwithstanding  the provisions of paragraphs (d) and (e)
         of this Section 1.1, TDS, the Company,  Operating  Company and Investor
         may agree in writing  prior to the First Closing Date that the Investor
         Price Per Company  Share,  both for purposes of  paragraph  (d) of this
         Section 1.1 and for purposes of calculating  the Investor Price Per AOC
         Option Share  pursuant to paragraph  (e) of this Section 1.1,  shall be
         equal to the TDS Price Per Company Share.

                                        3

<PAGE>




1.2      Issuance of Operating Company Shares in Connection with Assignment of
         Debt and Transfer of Investor Proceeds.

                  (a) On the First  Closing  Date,  the Company shall deliver to
         Investor  a  notice  pursuant  to  Section  4.1(d)  of  the  Investment
         Agreement  (the  "Section  4.1(d)  Notice"),  unless TDS,  the Company,
         Operating  Company and Investor shall agree in writing that the Section
         4.1(d)  Notice  either may be delivered  on a different  date or is not
         required.

                  (b) Subject to the terms and conditions of this Agreement,  at
         and as of the Second  Closing (as defined  herein),  the Company  shall
         acquire from Operating  Company,  and Operating Company shall issue and
         sell to the  Company,  that  number  of fully  paid  and  nonassessable
         Operating  Company  Shares  (the  "Company   Subscription  Shares")  as
         determined in accordance with the immediately  following  sentence,  in
         exchange  for the  consideration  set  forth in  paragraph  (c) of this
         Section 1.2. The number of Company  Subscription  Shares shall be equal
         to the  quotient  of (1) the  Company  Subscription  Price (as  defined
         herein)  divided  by (2) a price  per  share  (the  "Company  Price Per
         Operating Company Share") equal to the product of (A) the Exchange Rate
         multiplied by (B) the Aerial Average for the twenty consecutive trading
         day period  ending on the last  trading day prior to the First  Closing
         Date.

                  (c) The  aggregate  purchase  price  for the  purchase  by the
         Company of the Company Subscription Shares as contemplated in paragraph
         (b) of this Section 1.2 (the  "Company  Subscription  Price")  shall be
         equal to the sum of (1) the TDS  Purchase  Price  and (2) the  Investor
         Proceeds,  if any. The Company  Subscription Price shall be paid by (A)
         the  assignment  by the Company to  Operating  Company of the  Assigned
         Obligations  (exclusive  of  interest  accrued  thereon  for the period
         commencing  on the First  Closing  Date and  terminating  on the Second
         Closing Date (as defined  herein)),  pursuant to an  instrument  in the
         form  attached  hereto  as  Exhibit  4  (the  "Second   Assignment  and
         Acceptance")  and (B) if  applicable,  the  transfer  by the Company to
         Operating Company of immediately  available funds equal to the Investor
         Proceeds.  Effective as of such  assignment,  the New Credit  Agreement
         will terminate pursuant to the Second Assignment and Acceptance.

                  (d) If Investor  elects to exercise  its  subscription  rights
         pursuant  to  Section  4.1(c)  and  (d)  of  the  Investment  Agreement
         ("Section 4.1(c)  Subscription  Rights"),  then Operating Company shall
         issue to Investor on the Second  Closing  Date that number of Operating
         Company  Shares for which  Investor has  subscribed  as provided in the
         Investment Agreement (the "Additional Investor  Subscription  Shares"),
         subject to the  receipt  of the  proceeds  from  Investor  as  required
         pursuant  to  the  Investment   Agreement  (the  "Additional   Investor
         Proceeds"). The price per share of the Additional Investor Subscription
         Shares (the  "Investor  Price Per  Operating  Company  Share") shall be
         equal to the Company Price Per Operating  Company Share (as  calculated
         pursuant to paragraph (b) of this Section 1.2).

                                        4

<PAGE>



                  (e)  Notwithstanding  the provisions of paragraphs (b) and (d)
         of this Section 1.2, TDS, the Company,  Operating  Company and Investor
         may agree in  writing  prior to the Second  Closing  Date that both the
         Company  Price Per Operating  Company Share and the Investor  Price Per
         Operating  Company  Share  shall  be equal  to the  product  of (1) the
         Exchange Rate multiplied by (2) the TDS Price Per Company Share.

1.3  Limitation on Purchase of Shares.  Notwithstanding  any other  provision in
this  Agreement,  TDS shall  cause the  aggregate  dollar  amount of (a) the TDS
Purchase Price to not be less than  $400,000,000 and to not exceed  $450,000,000
as  determined  by TDS,  (b) the sum of the TDS  Purchase  Price,  the  Investor
Proceeds,  the Investor AOC Option Proceeds and the Additional Investor Proceeds
(the "Aggregate  Proceeds") to not exceed  $650,000,000 (the "Aggregate Proceeds
Cap"),  and (c) the  Aggregate  Proceeds to be  allocated  within the  Aggregate
Proceeds Cap between TDS and Investor as permitted by the  Investment  Agreement
or as TDS and Investor shall otherwise agree in writing; provided, however, that
in  the  event  that  the  Settlement  Agreement  and  Release  currently  under
negotiation  among the parties hereto,  Investor and Sonera  Corporation U.S. is
not executed,  then (1) the TDS Purchase Price may be less than $400,000,000 but
shall not exceed  $450,000,000 and (2) the sum of the Aggregate Proceeds and any
additional  dollar  amounts of equity  that  Investor  is  entitled  to purchase
pursuant to the Three-Year  Option or Seven-Year Option as set forth in Sections
4.2  and  4.3,  respectively,  of the  Investment  Agreement  shall  not  exceed
$650,000,000.


1.4  Payment  of Accrued  Interest  to  Company.  On the  Second  Closing  Date,
Operating  Company shall pay to the Company cash in immediately  available funds
equal  to  the  amount  of the  interest  accrued  but  unpaid  on the  Assigned
Obligations for the period  commencing on the First Closing Date and terminating
on the Second Closing Date (the "Accrued Interest  Amount"),  in full payment of
such accrued interest.


1.5  Capitalization  of  Receivables  Owed to Operating  Company.  On the Second
Closing Date, Operating Company shall contribute to each of its subsidiaries, as
a contribution to the capital of such  subsidiary,  all, or such portion thereof
as Operating Company shall determine, of the receivables owed by such subsidiary
to Operating Company. Because each such subsidiary is wholly-owned,  directly or
indirectly,  by Operating Company, no additional stock or partnership  interests
will be issued to Operating Company in exchange for such contributions.


1.6 Modification of Revolving Credit Agreement  Interest Rate and Termination of
Guaranty.  On the Second  Closing Date, the Revolving  Credit  Agreement will be
amended  pursuant to a Fifth Amendment to the Revolving  Credit Agreement in the
form attached hereto as Exhibit 5 (the "Fifth Amendment") to modify the interest
rate thereunder and to terminate the Revolving Credit Agreement Guaranty.


                                        5

<PAGE>




1.7 Amendment and Restatement of Revolving  Credit  Agreement.  At the Effective
Time, the Revolving Credit Agreement will be amended and restated pursuant to an
Amended and Restated  Credit  Agreement in the form attached hereto as Exhibit 6
(the "Amended and Restated Credit  Agreement"),  which will govern all remaining
Obligations  (including  accrued  interest)  to TDS under the  Revolving  Credit
Agreement  that  are  outstanding  as  of  the  Effective  Time  (the  "Adjusted
Obligations").  The Amended and Restated  Credit  Agreement will provide,  inter
alia,  that the  maturity  date of the Adjusted  Obligations  shall be the first
anniversary of the Effective Time and that the Adjusted Obligations shall accrue
interest at the rate of 3.50% above  one-month  LIBOR, as in effect from time to
time and as calculated  pursuant to the terms of the Amended and Restated Credit
Agreement. The Amended and Restated Credit Agreement will remain in effect until
the repayment in full of the Adjusted Obligations, at which time the Amended and
Restated Credit Agreement shall be terminated.


Section 2.  Closing of Transactions and Deliveries.

         2.1      First Closing.

                  (a)  Time  of  First   Closing.   The   consummation   of  the
         transactions  contemplated  by Section  1.1 (other than  paragraph  (a)
         thereof) (the "First  Closing")  shall occur on the thirtieth  Business
         Day occurring  after the date of delivery of the Section  9.1(a) Notice
         by the Company to Investor,  or on such other date  occurring  prior to
         the Effective Time as TDS, the Company,  Operating Company and Investor
         may agree in  writing.  (The date of the First  Closing is  referred to
         herein as the "First Closing Date").

                  (b) Place of First Closing. The First Closing shall take place
         at the  offices  of the  Company,  or at such other  place as TDS,  the
         Company, Operating Company and Investor may agree in writing.

                  (c) First Closing Deliveries. At the First Closing:

                             (i) The Company shall deliver to:

                                     (A) TDS:

                                            (1)  certificates  representing  the
                                                 Company Shares;

                                            (2)  the   First    Assignment   and
                                                 Acceptance; and

                                            (3)  The Fourth Amendment.

                                     (B) Operating Company:


                                                             6

<PAGE>



                                            (1)  the   First    Assignment   and
                                                 Acceptance;

                                            (2)  the New Credit Agreement; and

                                            (3)  The Fourth Amendment.

                             (ii) TDS shall  deliver to each of the  Company and
                  Operating  Company the First Assignment and Acceptance and the
                  Fourth Amendment.

                             (iii) Operating Company shall deliver to:

                                     (A) the Company:

                                            (1)  the   First    Assignment   and
                                                 Acceptance;

                                            (2)  the New Credit Agreement; and

                                            (3)  the Fourth Amendment.

                                     (B) TDS:

                                            (1)  the   First    Assignment   and
                                                 Acceptance; and

                                            (2)  the Fourth Amendment.

                             (iv) In the event Investor exercises:

                                     (A) the Section 9.2 Subscription Rights:

                                            (1)  Investor  shall  deliver to the
                                     Company  immediately  available funds equal
                                     to the Investor Proceeds; and

                                            (2) the  Company  shall  deliver  to
                                     Investor    one   or   more    certificates
                                     representing   the  Investor   Subscription
                                     Shares.

                                     (B) the AOC Option:

                                            (1)   Investor   shall   deliver  to
                                     Operating  Company  immediately   available
                                     funds  equal  to the  Investor  AOC  Option
                                     Proceeds; and

                                            (2) Operating  Company shall deliver
                                     to  Investor   one  or  more   certificates
                                     representing   the   Investor   AOC  Option
                                     Shares.

                             (v) Each party shall deliver to the other  parties,
                  as appropriate, such

                                        7

<PAGE>



                  other  documents as may be  reasonably  requested by the other
                  parties  that are  necessary  or  desirable to carry out their
                  respective  obligations under this Agreement and to effectuate
                  the purposes hereof.

         2.2      Second Closing.

                  (a) Time of Second  Closing;  Sequence  of  Transactions.  The
         consummation  of the  transactions  contemplated by Sections 1.2 (other
         than  paragraph (a) thereof),  1.4, 1.5 and 1.6 (the "Second  Closing")
         shall occur on the thirtieth  Business Day occurring  after the date of
         delivery of the Section 4.1(d) Notice by the Company to Investor, or on
         such other  date  occurring  prior to the  Effective  Time as TDS,  the
         Company, Operating Company and Investor may agree in writing. (The date
         of the Second  Closing is  referred  to herein as the  "Second  Closing
         Date").  The consummation of the  transactions  occurring on the Second
         Closing Date shall occur in the following sequence:

                             (1) the  transactions  contemplated by Sections 1.2
                  (other  than  paragraph  (a)  thereof),  1.4 and 1.5  shall be
                  consummated concurrently with each other; and

                             (2)  immediately  after the  consummation of all of
                  the  transactions  identified  in clause  (1) of this  Section
                  2.2(a),  the transaction  contemplated by Section 1.6 shall be
                  consummated.

                  (b) Place of Second  Closing.  The Second  Closing  shall take
         place at the offices of  Operating  Company,  or at such other place as
         TDS, the Company, Operating Company and Investor may agree in writing.

                  (c)        Second Closing Deliveries.  At the Second Closing:

                             (i)     Operating Company shall deliver to:

                                     (A) the Company:

                                            (1)  a certificate  representing the
                                                 Company Subscription Shares;

                                            (2)  the   Second   Assignment   and
                                                 Acceptance;

                                            (3)  immediately   available   funds
                                                 equal to the  Accrued  Interest
                                                 Amount; and

                                            (4)  the Fifth Amendment.

                                     (B) TDS, the Fifth Amendment.


                                        8

<PAGE>



                             (ii) The Company shall deliver to:

                                     (A)  Operating Company:

                                            (1)  the   Second   Assignment   and
                                                 Acceptance;

                                            (2)  immediately   available   funds
                                                 equal to the Investor Proceeds,
                                                 if any; and

                                            (3)  the Fifth Amendment.

                                     (B) TDS, the Fifth Amendment.

                             (iii) TDS shall  deliver to  Operating  Company and
                  the Company the Fifth Amendment.

                             (iv) In the event  Investor  exercises  the Section
                  4.1(c) Subscription Rights:

                                     (A)  Investor  shall  deliver to  Operating
                             Company  immediately  available  funds equal to the
                             Additional Investor Proceeds; and

                                     (B)  Operating  Company  shall  deliver  to
                             Investor one or more certificates  representing the
                             Additional Investor Subscription Shares.

                             (v) Operating  Company and its  subsidiaries  shall
                  take such  actions  and  deliver  such  documents  as shall be
                  necessary to effect the  transactions  contemplated by Section
                  1.5 hereof.

                             (vi) Each party shall deliver to the other parties,
                  as  appropriate,  such other  documents  as may be  reasonably
                  requested by the other parties that are necessary or desirable
                  to carry out their respective obligations under this Agreement
                  and to effectuate the purposes hereof.

         2.3      Amended and Restated Credit Agreement Closing.

                  (a) Time of Amended and Restated Credit Agreement Closing. The
         execution of the Amended and Restated Credit Agreement  contemplated by
         Section 1.7 shall occur at the Effective Time.

                  (b) Place of Amended and Restated  Credit  Agreement  Closing.
         The execution of the Amended and Restated  Credit  Agreement shall take
         place at the location of the Closing of the  transactions  contemplated
         by the Reorganization Agreement.

                  (c)  Deliveries.  In connection  with the Amended and Restated
         Credit

                                        9

<PAGE>



         Agreement closing:

                             (i) TDS shall  execute  and deliver the Amended and
                  Restated  Credit   Agreement  to  the  Company  and  Operating
                  Company.

                             (ii) The Company shall,  and Parent shall cause the
                  Company to,  execute  and  deliver  the  Amended and  Restated
                  Credit Agreement to TDS and Operating Company.

                             (iii)  Operating  Company  shall,  and Parent shall
                  cause  Operating  Company to,  execute and deliver the Amended
                  and Restated Credit Agreement to TDS and the Company.

                             (iv) Each party shall deliver to the other parties,
                  as  appropriate,  such other  documents  as may be  reasonably
                  requested by the other parties that are necessary or desirable
                  to carry out their respective obligations under this Agreement
                  and to effectuate the purposes hereof.


Section 3.  Representations and Warranties.

         3.1 Representations  and Warranties of the Company.  The Company hereby
represents and warrants as follows:

                  (a) The Company has the legal capacity, power and authority to
         enter into and  perform  all of the  Company's  obligations  under this
         Agreement. The execution, delivery and performance of this Agreement by
         the Company has been duly authorized by all requisite  corporate action
         and does  not  violate  the  Company's  charter,  bylaws  or any  other
         instrument or agreement or any law,  regulation or order  applicable to
         the Company or its  assets.  This  Agreement  has been duly and validly
         executed  and  delivered  by the  Company and  constitutes  a valid and
         binding  agreement of the Company,  enforceable  against the Company in
         accordance with its terms,  except that such  enforceability (i) may be
         limited by  bankruptcy,  insolvency,  moratorium  or other similar laws
         affecting or relating to the enforcement of creditors' rights generally
         and (ii) is subject to general principles of equity.

                  (b) Each Company Share issued  pursuant to this Agreement will
         be,  when  issued,  duly  authorized,  validly  issued,  fully paid and
         nonassessable and not subject to preemptive rights by any person.

         3.2  Representations  and  Warranties of Operating  Company.  Operating
Company hereby represents and warrants as follows:

                  (a)  Operating  Company  has the  legal  capacity,  power  and
         authority  to enter into and  perform  all of the  Operating  Company's
         obligations   under  this  Agreement.   The  execution,   delivery  and
         performance of this Agreement by Operating Company

                                       10

<PAGE>



         has been duly authorized by all requisite corporate action and does not
         violate Operating Company's charter,  bylaws or any other instrument or
         agreement  or any law,  regulation  or order  applicable  to  Operating
         Company  or its  assets.  This  Agreement  has been  duly  and  validly
         executed and delivered by Operating Company and constitutes a valid and
         binding agreement of Operating Company,  enforceable  against Operating
         Company in accordance with its terms,  except that such  enforceability
         (i) may be  limited  by  bankruptcy,  insolvency,  moratorium  or other
         similar laws  affecting or relating to the  enforcement  of  creditors'
         rights generally and (ii) is subject to general principles of equity.

                  (b) Each  Operating  Company  Share  issued  pursuant  to this
         Agreement will be, when issued, duly authorized,  validly issued, fully
         paid and  nonassessable  and not  subject to  preemptive  rights by any
         person.

         3.3 Representations and Warranties of Parent.  Parent hereby represents
and warrants as follows:

                  (a)  Parent has the legal  capacity,  power and  authority  to
         enter  into  and  perform  all  of  Parent's   obligations  under  this
         Agreement. The execution, delivery and performance of this Agreement by
         Parent has been duly authorized by all requisite  corporate  action and
         does not violate  Parent's  charter,  bylaws or any other instrument or
         agreement or any law,  regulation or order  applicable to Parent or its
         assets. This Agreement has been duly and validly executed and delivered
         by Parent and  constitutes  a valid and  binding  agreement  of Parent,
         enforceable  against Parent in accordance  with its terms,  except that
         such  enforceability  (i) may be  limited  by  bankruptcy,  insolvency,
         moratorium  or  other  similar  laws   affecting  or  relating  to  the
         enforcement  of  creditors'  rights  generally  and (ii) is  subject to
         general principles of equity.

         3.4  Representations  and Warranties of TDS. TDS hereby  represents and
warrants as follows:

                  (a) TDS has the legal  capacity,  power and authority to enter
         into and perform all of TDS's  obligations  under this  Agreement.  The
         execution,  delivery and  performance of this Agreement by TDS has been
         duly authorized by all requisite  corporate action and does not violate
         TDS's charter,  bylaws or any other instrument or agreement or any law,
         regulation or order applicable to TDS or its assets. This Agreement has
         been duly and validly  executed and delivered by TDS and  constitutes a
         valid  and  binding  agreement  of  TDS,  enforceable  against  TDS  in
         accordance with its terms,  except that such  enforceability (i) may be
         limited by  bankruptcy,  insolvency,  moratorium  or other similar laws
         affecting or relating to the enforcement of creditors' rights generally
         and (ii) is subject to general principles of equity.


Section 4.  Covenants and Agreements.

                                       11

<PAGE>



         4.1 Brokers.  Each party agrees to indemnify,  hold harmless and defend
the other  parties  from and against any fee or expense due or alleged to be due
to any broker or finder which acted or claims to have acted on such indemnifying
party's  behalf  in  connection  with  the  transactions  contemplated  by  this
Agreement.


Section 5.  Miscellaneous.

         5.1  Termination.  This Agreement  shall  terminate in the event of the
termination of the Reorganization Agreement pursuant to Section 8.1 thereof.

         5.2  Interpretation.  References to this Agreement  shall refer to this
Agreement and all exhibits, schedules and annexes hereto.

         5.3 Further  Assurances.  The parties  hereto will,  from time to time,
execute and deliver,  or cause to be executed and delivered,  such additional or
further  consents,  proxies,  documents and other  instruments  as the other may
reasonably request for the purpose of effectively  carrying out the transactions
contemplated by this Agreement.

         5.4  Successors,  Assigns and Transferees  Bound;  Parties in Interest.
This Agreement shall be binding upon the successors,  assigns and transferees of
the  parties  hereto,  and the  parties  hereto  shall take any and all  actions
necessary to obtain the written  confirmation from any such successor,  assignee
or transferee  that it is bound by the terms hereof.  Nothing in this Agreement,
express or implied, is intended or shall be construed to confer upon any Person,
other than the parties hereto and their  successors and permitted  assigns,  any
right, remedy or claim under or by reason of this Agreement.

         5.5 Remedies.  Each party hereto  acknowledges that money damages would
be both incalculable and an insufficient remedy for any breach of this Agreement
by it, and that any such breach  would cause the other party  irreparable  harm.
Accordingly,  each party  agrees  that in the event of any breach or  threatened
breach of this Agreement,  the other party, in addition to any other remedies at
law or in equity that it may have, shall be entitled, without the requirement of
posting a bond or other  security,  to equitable  relief,  including  injunctive
relief and specific performance.

         5.6 Submission to  Jurisdiction.  Each party hereto hereby  irrevocably
submits  in any suit,  action or  proceeding  arising  out of or related to this
Agreement  or any of the  transactions  contemplated  hereby or  thereby  to the
exclusive  jurisdiction of the courts of the United States and the  jurisdiction
of the  courts of the State of  Delaware  and  waive any and all  objections  to
jurisdiction  that they may have under the laws of the State of  Delaware or the
United States and any claim or objection that any such court is an  inconvenient
forum.

         5.7 Severability.  The invalidity or  unenforceability of any provision
of  this  Agreement  in any  jurisdiction  shall  not  affect  the  validity  or
enforceability of any other provision of this Agreement in such jurisdiction, or
the validity or enforceability of any

                                       12

<PAGE>



provision of this Agreement in any other jurisdiction.

         5.8 Amendment. This Agreement may be amended only by means of a written
instrument executed and delivered by each of the parties hereto.

         5.9      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
APPLICABLE PRINCIPLES OF CONFLICTS OF LAWS.

         5.10 Counterparts.  For the convenience of the parties,  this Agreement
may be executed in counterparts,  each of which shall be deemed an original, but
all of which together shall constitute one and the same instrument.

         5.11 Notices. All notices and other  communications  hereunder shall be
in writing and shall be deemed given if delivered personally,  sent by overnight
courier  (providing proof of delivery) or telecopied  (with a confirmatory  copy
sent by overnight courier) to the parties at the following addresses (or at such
other address for a party as shall be specified by like notice):

                  (a) if to the Parent,  or to the Company or Operating  Company
         after the Effective Time, to

                         VoiceStream Wireless
                         3650 131st Avenue SE, Suite 400
                         Bellevue, WA 98006
                         Attention: General Counsel
                         Facsimile No.: (425) 586-8040

                             with a copy to:

                         Preston Gates & Ellis LLP
                         5000 Columbia Center
                         701 Fifth Avenue
                         Seattle, WA 98104
                         Attention:  Richard B. Dodd, Esq.
                         Facsimile No.: (206) 623-7022

                  (b) if to TDS, or to the Company or Operating Company prior to
         the Effective Time, to

                         Telephone and Data Systems, Inc.
                         30 North LaSalle Street, Suite 4000
                         Chicago, IL 60602
                         Attention:  LeRoy T. Carlson, Chairman
                         Facsimile No.: (312) 630-9299

                                       13

<PAGE>



                             with a copy to:

                         Sidley & Austin
                         One First National Plaza
                         Chicago, Illinois 60603
                         Attention: Michael G. Hron, Esq.
                         Facsimile No.: (312) 853-7036

         5.12 Business  Days.  For purposes of this  Agreement,  "Business  Day"
shall have the meaning set forth in the Investment  Agreement.  All Business Day
intervals  set  forth in this  Agreement  shall,  to the  extent  necessary,  be
appropriately   adjusted  to  ensure   compliance   with  all  relevant   notice
requirements under the Investment Agreement and any other applicable  provisions
thereof.

                                      *****

                                       14

<PAGE>



         IN WITNESS WHEREOF, TDS, the Company, Operating Company and Parent have
executed this Agreement as of the date first above written.

                                     TELEPHONE AND DATA SYSTEMS, INC.

                                     By:      /s/ LeRoy T. Carlson
                                         ---------------------------------
                                     Name:    LeRoy T. Carlson
                                     Title:   Chairman

                                     AERIAL COMMUNICATIONS, INC.


                                     By:      /s/ LeRoy T. Carlson, Jr.
                                        ----------------------------------
                                     Name:    LeRoy T. Carlson, Jr.
                                     Title:   Chairman

                                     AERIAL OPERATING COMPANY, INC.
                                     By:  /s/ Don W. Warkentin
                                        ------------------------------
                                     Name:    Don W. Warkentin
                                     Title:   President

                                     VOICESTREAM WIRELESS CORPORATION

                                     By:  /s/ Cregg B. Baumbaugh
                                        -----------------------------
                                     Name:    Cregg B. Baumbaugh
                                     Title: Executive Vice President - Strategy,
                                            Finance and Development

                                     VOICESTREAM WIRELESS HOLDING
                                     CORPORATION

                                     By:  /s/ Cregg B. Baumbaugh
                                        -----------------------------
                                     Name:    Cregg B. Baumbaugh
                                     Title: Executive Vice President - Strategy,
                                            Finance and Development

               SIGNATURE PAGE TO DEBT/EQUITY REPLACEMENT AGREEMENT
              AMONG TDS, THE COMPANY, OPERATING COMPANY AND PARENT.




                                       15

<PAGE>




                                                                    Exhibit 99.6
                          PARENT STOCKHOLDER AGREEMENT

                  PARENT STOCKHOLDER  AGREEMENT,  dated as of September 17, 1999
(this  "Agreement")  by  and  among  Aerial  Communications,  Inc.,  a  Delaware
corporation   ("Company"),   Telephone  and  Data  Systems,   Inc.,  a  Delaware
corporation ("TDS"),  VoiceStream Wireless Corporation, a Washington corporation
("VoiceStream"),   VoiceStream   Wireless   Holding   Corporation,   a  Delaware
corporation  ("Holding")(VoiceStream and Holding are collectively referred to as
Parent as provided in Section 1(b)) and the  individuals  and entities set forth
on Schedule I hereto (each a "Parent Stockholder" and, collectively, the "Parent
Stockholders").

                                    RECITALS

                  WHEREAS,   each  Parent   Stockholder   is  a  stockholder  of
VoiceStream;

                  WHEREAS, Company, VoiceStream, Holding, VoiceStream Subsidiary
III Corporation,  a Delaware corporation and a wholly-owned subsidiary of Parent
("Sub"),  and  Telephone  and Data  Systems,  Inc.  ("TDS") are entering into an
Agreement  and Plan of  Reorganization,  dated as of  September  17,  1999  (the
"Reorganization  Agreement"),  providing for, among other things,  the merger of
Sub with and into Company and the  conversion of shares of Company  Common Stock
into shares of Parent Common Stock, par value $0.001(the "Parent Common Stock");

                  WHEREAS,  the Board of Directors of Parent,  at a meeting duly
called and held, duly adopted  resolutions  approving,  among other things,  the
Reorganization   Agreement  and  the   Reorganization,   determining   that  the
Reorganization  and the issuance  (the  "Parent  Share  Issuance")  of shares of
Parent Common Stock in accordance with the  Reorganization to be fair to, and in
the best interests of, Parent's stockholders;

                  WHEREAS,  each Parent Stockholder owns beneficially the number
of shares of Parent Common Stock set forth  opposite  such Parent  Stockholder's
name in Schedule I hereto (the "VoiceStream Scheduled Shares"); and

                  WHEREAS, as a condition to Company's willingness to enter into
the  Reorganization  Agreement and as a condition to TDS's  willingness to enter
into a stockholder  agreement (the "TDS Stockholder  Agreement") with respect to
the  Reorganization  Agreement,  each of Company and TDS has required  that each
Parent  Stockholder  agree,  and in order to induce  Company  to enter  into the
Reorganization  Agreement  and to induce TDS to enter  into the TDS  Stockholder
Agreement, each Parent Stockholder has agreed, to enter into this Agreement;

                  NOW,  THEREFORE,  in  consideration  of the  foregoing and the
mutual  covenants and agreements  set forth herein,  the parties hereto agree as
follows:


                                       -1-

<PAGE>



                  1. Defined Terms and Certain  Matters.  (a) Capitalized  terms
used in this  Agreement  that are not defined herein shall have such meanings as
set forth in the Reorganization Agreement.

                  (b) VoiceStream, Holding and Omnipoint Corporation, a Delaware
corporation   ("Omnipoint"),   have  entered  into  an  Agreement  and  Plan  of
Reorganization dated as of June 23, 1999 (the "Omnipoint  Agreement")  providing
for, among other things, the acquisition of Omnipoint.  VoiceStream shall be the
Parent for  purposes of this  Agreement  until the earlier of the closing of the
reorganization    contemplated   by   the   Omnipoint   Agreement    ("Omnipoint
Reorganization") or the Merger provided for in the Reorganization Agreement.

                  "Qualified  Designee"  shall mean an individual  who is not an
officer,  director,  management  level  employee or  Affiliate of TDS, or of any
Person in which TDS or any Affiliate of TDS has an  "attributable  interest" (as
defined by applicable FCC rules and regulations) designated by TDS provided that
Parent shall have the right to approve the designee, which approval shall not be
unreasonably withheld.

                  "Beneficially  Owned"  and  "Beneficial  Ownership"  have  the
meaning set forth in Rule 13d-3 of the rules and regulations  promulgated  under
the Exchange Act; except that no broker or dealer or any affiliate thereof shall
be deemed to Beneficially Own shares of Common Stock,  the beneficial  ownership
of which is acquired in the  ordinary  course of the  activities  of a broker or
dealer  registered  under Section 15 of the Securities  Exchange Act of 1934, as
amended,  including, but not limited to, the acquisition of beneficial ownership
of such securities as a result of any  market-making or underwriting  activities
(including any shares acquired for the investment  account of a broker or dealer
in connection with such underwriting activities),  or the exercise of investment
or  voting  discretion  authority  over  any of its  customer  accounts,  or the
acquisition in good faith of such  securities in connection with the enforcement
of payment of a debt previously contracted.


                  2.         Voting Agreement and Director Designees.

                  (a) Parent  Stockholders  are  parties to a Voting  Agreement,
dated May 3, 1999  ("VoiceStream  Voting  Agreement"),  pursuant  to which  each
Parent  Stockholder  agreed on the terms  set  forth in the  VoiceStream  Voting
Agreement to vote the shares of Parent Common Stock  Beneficially Owned by it at
the time of a vote in favor of directors designated by such Parent Stockholders.
On June  23,  1999  the  Parent  Stockholders  entered  into an  Agreement  (the
"Omnipoint  Voting  Agreement")  with certain  stockholders  of  Omnipoint  (the
"Omnipoint Stockholders") in which they agreed, among other things, to terminate
the VoiceStream  Voting Agreement and enter into a new Voting Agreement on terms
mutually satisfactory to Omnipoint  Stockholders and Parent Stockholders ("Newco
Voting Agreement") which will set forth voting  arrangements which will apply to
Holding  after the Omnipoint  Reorganization.  The Parent  Stockholders  and TDS
hereby agree as

                                       -2-

<PAGE>



follows: (i) if at the Effective Time the Omnipoint  Reorganization has not been
consummated, the Parent Stockholders and TDS shall enter into a voting agreement
("Newco Voting  Agreement II") effective on the Effective Time on terms mutually
satisfactory  to the  Parent  Stockholders  and TDS,  pursuant  to which (w) the
voting  arrangements  which existed under the VoiceStream  Voting Agreement will
apply to  Parent,  (x) the  provisions  of  Section  2(b)  below  shall  also be
effectuated,  (y) the  provisions of the letter  agreement,  dated June 23, 1999
("Hutchison  Letter"),  with  Hutchinson  will  be  effectuated,  and  (z)  upon
consummation of the Omnipoint  Reorganization,  the provisions of Section 7.4 of
the Omnipoint Agreement shall be effectuated;  (ii) if at the Effective Time the
Omnipoint  Reorganization has been consummated,  the Parent Stockholders and TDS
shall enter into, and shall use reasonable efforts to seek to have the Omnipoint
Stockholders  to  enter  into,  Newco  Voting  Agreement  II,  effective  on the
Effective Time on terms mutually  satisfactory to the Parent  Stockholders,  TDS
and the Omnipoint  Stockholders  effectuating  each of clauses (w), (x), (y) and
(z)  above.  If the  Omnipoint  Stockholders  do not  enter  into  Newco  Voting
Agreement  II  which  shall be  effective  at the  Effective  Time,  the  Parent
Stockholders and TDS shall enter into Newco Voting Agreement II effective at the
Effective Time, it being understood and agreed that the Parent  Stockholders and
the Omnipoint Stockholders will still enter into the Newco Voting Agreement.

                  (b) Pursuant to Newco  Voting  Agreement II each of the Parent
Stockholders and TDS (and the Omnipoint Stockholders if they agree to enter into
such agreement)  shall agree, on the terms set forth therein,  to vote, or cause
to be voted, all of the shares of Parent Common Stock  Beneficially  Owned by it
at the time of the  vote in  person  or by  proxy  (and  shall  take  all  other
necessary or desirable  action within TDS or such Parent  Stockholder's  control
including attendance at meetings in person or by proxy for purposes of obtaining
a quorum  and  execution  of  written  consents  in lieu of  meetings),  for the
election  and  continuation  in  office  of (i) one (1)  Qualified  Designee  as
director of Parent so long as TDS Beneficially Owns at least 4,500,000 shares of
Parent Common Stock; provided, however if TDS owns more than 9,800,000 shares of
Parent Common Stock and Sonera Ltd. and its  Affiliates  own less than 4,500,000
shares of Parent  Common  Stock,  TDS shall be permitted  to  designate  two (2)
Qualified Designees as directors of Parent; (ii) the directors designated by the
Parent Stockholders pursuant to the VoiceStream Voting Agreement (as restated in
Newco  Voting  Agreement  II),  the  Hutchison  Letter  and  Section  7.4 of the
Omnipoint Agreement.

                  (c)  By  their   execution  of  this   Agreement  each  Parent
Stockholder  severally agrees to be bound by the provisions of Sections 6(a) and
6(b) of the Investor  Agreement,  dated as of September  17, 1999,  among Sonera
Ltd.,  VoiceStream and Holding and agree that Sonera Ltd. shall be a third party
beneficiary of this sub clause (c).

                  (d) Parent agrees if necessary, to amend the Bylaws of Parent,
to increase the number of authorized directors to a number sufficient to satisfy
the obligations in the VoiceStream Voting Agreement,  Newco Voting Agreement and
Newco Voting Agreement II, as applicable.

                                       -3-

<PAGE>



                  3. Covenants of Each Parent Stockholder.  Until the earlier of
the Effective  Time or the  termination  of this  Agreement in  accordance  with
Section 5, each Parent Stockholder covenants and agrees as follows:

                  (a) Each Parent Stockholder hereby agrees to attend the Parent
Stockholders' Meeting, in person or by proxy, and to vote (or cause to be voted)
all VoiceStream Scheduled Shares owned by such Parent Stockholder at the time of
the  Parent  Stockholders'  Meeting in favor of  adoption  and  approval  of the
Reorganization Agreement, the Merger and the Parent Share Issuance and any other
matters   necessary  to  consummate  the   transactions   contemplated   in  the
Reorganization  Agreement;  such  agreement  to  vote  shall  apply  also to any
adjournment or adjournments of the Parent Stockholders' Meeting.

                  (b)  Each  of  John  W.  Stanton,  Theresa  E.  Gillespie,  PN
Cellular,  Inc.,  Stanton  Family  Trust,  Stanton  Communications  Corporation,
Hutchison    Telecommunications    Holdings    (USA)   Limited   and   Hutchison
Telecommunications  PCS  (USA)  Limited  (collectively  the  "Designated  Parent
Stockholders")  hereby  agrees  not  to  sell,  transfer,  pledge,  encumber  or
otherwise dispose of (collectively, "Transfer") any of its VoiceStream Scheduled
Shares, unless, as a condition to any such Transfer, each transferee (or, in the
case of a pledge  or  similar  transfer,  each  pledge  or  similar  conditional
transferee)  of any such shares,  prior to such  Transfer  (or, in the case of a
pledge or similar  transfer,  prior to taking title to or exercising  any rights
with respect to the applicable VoiceStream Scheduled Shares),  agrees in writing
to be bound by the  provisions of Sections 3 and 5 through 16 of this  Agreement
applicable to the Parent  Stockholders (and such transferee shall thereby become
a Parent  Stockholder  for all  purposes  of Sections 3 and 5 through 16 of this
Agreement).  Any Transfer by a Designated Parent Stockholders of such shares and
securities  without compliance with this Section 3(b) of this Agreement shall be
null and void and such  transferee  shall  have no  rights as a  stockholder  of
VoiceStream.

                  (c) To the extent  inconsistent with the foregoing  provisions
of this Section 3, each Parent  Stockholder  hereby revokes any and all previous
proxies with respect to such Parent Stockholder's VoiceStream Scheduled Shares.

                  4. Representations and Warranties of Parent Stockholder.  Each
Parent Stockholder,  severally,  as to such Parent  Stockholder,  represents and
warrants (which  representations  shall continue for the term of this Agreement)
to each of Company and TDS as follows:

                  (a) Such Parent Stockholder has the legal capacity,  power and
authority to enter into and perform all of such Parent Stockholder's obligations
under this Agreement.  To the extent such Parent  Stockholder is a legal entity,
the  execution,  delivery  and  performance  of this  Agreement  by such  Parent
Stockholder has been duly authorized by all requisite  corporate or other entity
action and does not violate such Parent Stockholder's  organizational documents.
The  execution,  delivery  and  performance  of this  Agreement  by such  Parent
Stockholder does not violate any other instrument or agreement or any law,

                                       -4-

<PAGE>



regulation  or  order  applicable  to such  Parent  Stockholder  or its  assets,
including,  without limitation, any voting agreement,  stockholders agreement or
voting trust. This Agreement has been duly and validly executed and delivered by
such Parent  Stockholder and  constitutes a valid and binding  agreement of such
Parent  Stockholder,  enforceable  against such Parent Stockholder in accordance
with its terms.

                  (b) (i) Such Parent  Stockholder is the  beneficial  owner of,
and has good and marketable title to, the VoiceStream Scheduled Shares set forth
opposite its name on Schedule I, and (ii) such Parent  Stockholder  has the sole
right to vote, the sole power of disposition with respect to, and the sole power
to demand appraisal rights with respect to, the VoiceStream Scheduled Shares set
forth opposite its name on Schedule I, and none of such shares is subject to any
voting trust, proxy or other agreement,  arrangement or restriction with respect
to the voting of such shares  which in any way limits,  restricts  or  conflicts
with this Agreement.

                  5.  Termination.  This  Agreement  shall  terminate  upon  the
earlier of (i)  termination of the  Reorganization  Agreement as provided for in
Section  8.1 of the  Reorganization  Agreement  or  (ii)  the  later  of (A) the
Effective  Time or (B) full  execution of Newco Voting  Agreement II as provided
for in Section 2(a).

                  6. Further Assurances.  Each Parent  Stockholder,  Company and
TDS will,  from time to time,  execute and deliver,  or cause to be executed and
delivered,  such additional or further  consents,  proxies,  documents and other
instruments as the other may  reasonably  request for the purpose of effectively
carrying out the transactions contemplated by this Agreement.

                  7. Successors,  Assigns and Transferees  Bound. This Agreement
shall be binding  upon the  successors,  assigns and, to the extent set forth in
Section 3(b) hereof with respect to Designated Parent Stockholders,  transferees
of the parties  hereto,  and the parties  hereto  shall take any and all actions
necessary to obtain the written  confirmation from any such successor,  assignee
and, to the extent set forth in Section 3(b) hereof with  respect to  Designated
Parent Stockholders, transferee that it is bound by the terms hereof.

                  8. Remedies. Each party hereto acknowledges that money damages
would be both  incalculable  and an  insufficient  remedy for any breach of this
Agreement  by it,  and  that  any  such  breach  would  cause  the  other  party
irreparable harm. Accordingly, each party agrees that in the event of any breach
or  threatened  breach of this  Agreement,  the other party,  in addition to any
other remedies at law or in equity it may have,  shall be entitled,  without the
requirement of posting a bond or other security, to equitable relief,  including
injunctive relief and specific performance.

                  9.  Submission  to  Jurisdiction.  Each  party  hereto  hereby
irrevocably  submits in any suit, action or proceeding arising out of or related
to this Agreement or any of the transactions  contemplated  hereby or thereby to
the exclusive  jurisdiction of the United States District Court for the District
of Delaware and the courts of the State of

                                       -5-

<PAGE>



Delaware  and waives any and all  objections  to  jurisdiction  that it may have
under the laws of the State of  Delaware  or the United  States and any claim or
objection that any such court is an inconvenient forum.

                  10.  Severability.  The invalidity or  unenforceability of any
provision of this Agreement in any jurisdiction shall not affect the validity or
enforceability of any other provision of this Agreement in such jurisdiction, or
the validity or  enforceability  of any provision of this Agreement in any other
jurisdiction.

                  11. Amendment.  This Agreement may be amended only by means of
a written instrument executed and delivered by each of the Parent  Stockholders,
Company and TDS.

                  12.        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 APPLICABLE PRINCIPLES OF CONFLICTS OF LAWS.

                  13.  Counterparts.  For the  convenience of the parties,  this
Agreement  may be  executed  in  counterparts,  each of which shall be deemed an
original,  but  all  of  which  together  shall  constitute  one  and  the  same
instrument.

                  14. Notices.  All notices and other  communications  hereunder
shall be in writing and shall be deemed given if delivered  personally,  sent by
overnight   courier   (providing  proof  of  delivery)  or  telecopied  (with  a
confirmatory  copy sent by  overnight  courier) to the parties at the  following
addresses  (or at such other  address for a party as shall be  specified by like
notice):

                  (a)  if to Company, to

                             Aerial Communications, Inc.
                             8410 West Bryn Mawr, Suite 1100
                             Chicago, Illinois  60631
                             Attn:  President
                             Telecopy No.:  773-399-4147

         with a copy to:

                             Aerial Company Communications, Inc.
                             c/o Telephone and Data Systems, Inc.
                             30 North LaSalle, Suite 4000
                             Chicago, Illinois  60602
                             Attn:  Chairman
                             Telecopy No.:  312-853-9299


                                       -6-

<PAGE>



         with a copy to:

                             Sidley & Austin
                             One First National Plaza
                             Chicago, Illinois  60603
                             Attn:  Michael G. Hron, Esq.
                             Telecopy No.:  312-853-7036

                  (b)  if to TDS, to

                             Telephone and Data Systems, Inc.
                             30 North LaSalle, Suite 4000
                             Chicago, Illinois  60602
                             Attn:  Chairman
                             Telecopy No.:  312-853-9299

                             with a copy to:

                             Sidley & Austin
                             One First National Plaza
                             Chicago, Illinois  60603
                             Attention: Michael G. Hron, Esq.
                             Telecopy No.:  312-853-7036

                  (c)        if  to   VoiceStream,   to   VoiceStream   Wireless
                             Corporation 3650 131st Avenue S.E.
                             Suite 400
                             Bellevue, WA  98006
                             Attention: General Counsel
                             Telecopy No.: 425-586-8080

                             with a copy to:

                             Friedman Kaplan & Seiler
                             875 Third Avenue
                             New York, NY  10022
                             Attn: Barry A. Adelman, Esq.
                             Telecopy No.:   212-355-6401

                             and

                             Preston Gates & Ellis LLP
                             5000 Columbia Center
                             701 Fifth Avenue

                                       -7-

<PAGE>



                             Seattle, WA  98104
                             Attn: Richard B. Dodd, Esq.
                             Telecopy No.:   206-623-7022

                  (d)        if to Holding, to
                             VoiceStream Wireless Holding Corporation 3650 131st
                             Avenue S.E.
                             Suite 400
                             Bellevue, WA  98006
                             Attention: General Counsel
                             Telecopy No.: 425-586-8080

                             with a copy to:

                             Friedman Kaplan & Seiler
                             875 Third Avenue
                             New York, NY  10022
                             Attn: Barry A. Adelman, Esq.
                             Telecopy No.:   212-335-6401

                             and

                             Preston Gates & Ellis LLP
                             5000 Columbia Center
                             701 Fifth Avenue
                             Seattle, WA  98104
                             Attn: Richard B. Dodd, Esq.
                             Telecopy No.:   206-623-7022

                  (e) if to a  Parent  Stockholder,  to it at the  corresponding
address set forth on Schedule I hereto.

                  15.  Limitation on  Liability.  No party hereto shall have any
liability hereunder for any acts or omissions of any other party hereto.

                  16.  Expenses.  Each party  hereto shall bear its own expenses
incurred in connection with this Agreement.

                                   * * * * * *



                                       -8-

<PAGE>



                  IN WITNESS WHEREOF,  the parties have signed this Agreement as
of the date noted above.


                                    AERIAL COMMUNICATIONS, INC.


                                    By:           /s/ LeRoy T. Carlson, Jr.
                                        ----------------------------------------
                                    Name:    LeRoy T. Carlson, Jr.
                                    Title:   Chairman


                                    TELEPHONE AND DATA SYSTEMS, INC.


                                    By:           /s/ LeRoy T. Carlson
                                        ----------------------------------------
                                    Name:    LeRoy T. Carlson
                                    Title:   Chairman



                                    PARENT STOCKHOLDERS:

                                    HELLMAN & FRIEDMAN CAPITAL PARTNERS II,
                                    L.P., A CALIFORNIA LIMITED PARTNERSHIP


                                    By: Hellman & Friedman Investors, L.P.,
                                         its general partner

                                    By: Hellman & Friedman Investors, Inc., its
                                         general partner

                                    By:        /s/ Mitchell Cohen
                                        ---------------------------------------
                                    Name:    Mitchell Cohen
                                    Title:   Vice President


                                    H&F ORCHARD PARTNERS, L.P., A CALIFORNIA
                                    LIMITED PARTNERSHIP


                                    By: H&F Orchard Investors, L.P.,
                                          its general partner

                                    By:      H&F Orchard Investors, Inc.,
                                                  its general partner

                                       -9-

<PAGE>





                                    By:        /s/ Mitchell Cohen
                                         --------------------------------
                                    Name:    Mitchell Cohen
                                    Title:   Vice President


                                    H&F INTERNATIONAL PARTNERS, L.P., A
                                    CALIFORNIA LIMITED PARTNERSHIP

                                    By: H&F International Investors, L.P.,
                                        its general partner


                                    By: H&F International Investors, Inc.,
                                        its general partner partner

                                       By:        /s/ Mitchell Cohen
                                           -------------------------------------
                                       Name:    Mitchell Cohen
                                       Title:   Vice President

                                                  /s/ John W. Stanton
                                            ------------------------------------
                                                     John W. Stanton

                                                 /s/ Theresa E. Gillespie
                                            ------------------------------------
                                                     Theresa E. Gillespie

                                    PN CELLULAR, INC.

                                    By:           /s/ John W. Stanton
                                        ----------------------------------------
                                    Name:    John W. Stanton
                                    Title:

                                    STANTON FAMILY TRUST

                                    By:           /s/ Theresa E. Gillespie
                                        ----------------------------------------
                                    Name:    Theresa E. Gillespi
                                    Title: Trustee

                                    STANTON COMMUNICATIONS CORPORATION

                                    By:           /s/ John W. Stanton
                                        ----------------------------------------
                                    Name:    John W. Stanton
                                    Title:


                                      -10-

<PAGE>



                                    GS CAPITAL PARTNERS, L.P.

                                    By:      GS Advisors L.P., General Partner

                                    By:      GS Advisors, Inc., General Partner

                                    By:      /s/ Eve M. Gerriets
                                        ---------------------------------------
                                    Name:    Eve M. Gerriets
                                    Title:   Vice President


                                    THE GOLDMAN SACHS GROUP, INC.


                                    By:           /s/ Joseph H. Glebermer
                                        ----------------------------------------
                                    Name:    Joseph H. Glebermer
                                    Title:   Vice President


                                    BRIDGE STREET FUND 1992, L.P.

                                    By: Stone Street Performance Corp., Managing
                                        General Partner

                                    By:           /s/ Eve M. Gerriets
                                        ---------------------------------------
                                    Name:    Eve M. Gerriets
                                    Title:   Vice President

                                    STONE STREET FUND 1992, L.P.

                                    By: Stone Street Performance Corp., General
                                        Partner

                                    By:           /s/ Eve M. Gerriets
                                        ---------------------------------------
                                    Name:    Eve M. Gerriets
                                    Title:   Vice President




                                      -11-

<PAGE>



                                  PROVIDENCE MEDIA PARTNERS L.P.

                                  By: Providence Media G.P. Limited Partnership,
                                      General Partner

                                  By: Providence Ventures L.P., General Partner


                                  By:      /s/ Jonathan M. Nelson
                                      -----------------------------------------
                                  Name:    Jonathan M. Nelson
                                  Title:   President


                                  HUTCHISON TELECOMMUNICATIONS HOLDINGS
                                  (USA) LIMITED


                                  By:   /s/ Canning Fok
                                      ----------------------------------------
                                  Name: Canning Fok
                                  Title: Director


                                  By:   /s/ Edith Shih
                                      -----------------------------------------
                                  Name: Edith Shih
                                  Title: Company Secretary



                                  HUTCHISON TELECOMMUNICATIONS PCS (USA)
                                  LIMITED


                                  By:   /s/ Canning Fok
                                      ----------------------------------------
                                  Name: Canning Fok
                                  Title: Director


                                  By:   /s/ Edith Shih
                                      ---------------------------------------
                                  Name: Edith Shih
                                  Title: Company Secretary


                                      -12-

<PAGE>




                                                                    Exhibit 99.7
                                                                  EXECUTION COPY


                        SETTLEMENT AGREEMENT AND RELEASE


                  This  SETTLEMENT  AGREEMENT AND RELEASE (this  "Agreement") is
entered  into as of the 17th day of  September  1999 by and among SONERA LTD., a
limited  liability  company  organized under the laws of the Republic of Finland
("Sonera"),  SONERA  CORPORATION  U.S., a Delaware  corporation and wholly-owned
subsidiary  of Sonera  ("Sonera  U.S."),  TELEPHONE  AND DATA  SYSTEMS,  INC., a
Delaware  corporation   ("TDS"),   AERIAL   COMMUNICATIONS,   INC.,  a  Delaware
corporation  and  majority-owned  subsidiary  of  TDS  ("Aerial"),   and  AERIAL
OPERATING COMPANY, INC., a Delaware corporation and majority-owned subsidiary of
Aerial ("AOC"). This Agreement is joined by VOICESTREAM WIRELESS CORPORATION,  a
Washington  corporation   ("VoiceStream"),   and  VOICESTREAM  WIRELESS  HOLDING
CORPORATION, a Delaware corporation ("Holding"), solely for purposes of Articles
I through II and VIII through X hereof.  (Sonera,  Sonera U.S.,  TDS, Aerial and
AOC,  and with  respect to  Articles I through II and  Articles  VIII  through X
hereof VoiceStream and Holding,  are hereafter  collectively  referred to as the
"parties")

                                R E C I T A L S:

                  WHEREAS,  on June 1, 1998, Sonera, TDS, Aerial and AOC entered
into a Purchase  Agreement (the "Purchase  Agreement")  pursuant to which Sonera
agreed

                                       -1-

<PAGE>



to purchase  Common  Shares,  par value  $0.001 per share,  of AOC ("AOC  Common
Shares") in an aggregate  amount of 2,410,482 AOC Common Shares (the  "Purchased
Shares") for an aggregate purchase price of $200,000,000 (the "Purchase Price");

                  WHEREAS,  the Purchase Agreement provides for an adjustment to
the  Purchase  Price by  requiring  that Sonera  surrender  up to 634,216 of the
Purchased  Shares for  cancellation  in the event  that,  during the first three
years after the Closing Date (as defined below),  the average of the daily means
of the high and low  sales  prices  for  Aerial  Common  Shares  for any  twenty
consecutive trading day period (the "Twenty-Day Aerial Average") exceeds certain
threshold prices (the "Threshold Prices");

                  WHEREAS, on August 31, 1998, in anticipation of the closing of
the  Purchase  Agreement,  (1) TDS  and  AOC  entered  into a  Revolving  Credit
Agreement  (the  "Revolving  Credit  Agreement");  and  (2)  Aerial  executed  a
Guaranty, dated as of August 31, 1998 (the "Aerial Guaranty"), in favor of TDS;

                  WHEREAS,  on  September  8, 1998  (the  "Closing  Date"),  the
parties  consummated  the  closing  of the  Purchase  Agreement  by  taking  the
following actions,  among others: (1) Sonera purchased the Purchased Shares from
AOC; (2) Sonera,  TDS, Aerial and AOC entered into an Investment  Agreement (the
"Investment  Agreement");  (3)  Sonera and Aerial  entered  into a  Registration
Rights Agreement (the  "Registration  Rights  Agreement");  (4) Sonera,  TDS and
Aerial entered into a side letter (the  "Management  Side  Letter");  (5) Sonera
U.S., Aerial and AOC entered into a Joint Venture Agreement (the

                                       -2-

<PAGE>



"Joint  Venture  Agreement");   (6)  Sonera,  Aerial  and  AOC  entered  into  a
Supplemental Agreement (the "Supplemental  Agreement");  and (7) TDS, Aerial and
AOC entered into a Tax  Allocation  Agreement (the "Tax  Allocation  Agreement")
(the Purchase Agreement,  Investment  Agreement,  Registration Rights Agreement,
Management Side Letter,  Joint Venture Agreement,  Supplemental  Agreement,  Tax
Allocation  Agreement,  Revolving  Credit  Agreement and Aerial  Guaranty  being
hereafter collectively referred to as the "Sonera Arrangements");

                  WHEREAS,  on December  18,  1998,  TDS  announced  that it was
withdrawing  its offer to exchange  tracking  stock for the  outstanding  Common
Shares,  par value $1.00 per share,  of Aerial ("Aerial Common Shares") and that
TDS intended to pursue a tax-free  spin-off of the Aerial Common Shares owned by
TDS (the "Spin-Off"), as well as other alternatives;

                  WHEREAS,  Sonera has  expressed  certain  concerns  to TDS and
Aerial  in  connection  with  the  Spin-Off  and the  Sonera  Arrangements,  has
requested that certain provisions of the Sonera Arrangements be renegotiated and
has raised the possibility of litigation in connection therewith;

                  WHEREAS,   on  the  basis  of  such   concerns   and  possible
litigation,  Sonera has not  surrendered any of the 634,216 Aerial Common Shares
(the "Disputed  Shares") for cancellation,  notwithstanding  that the Twenty-Day
Aerial Average has exceeded all three of the Threshold Prices;

                                       -3-

<PAGE>



WHEREAS,  Sonera,  TDS, Aerial and AOC have engaged in discussions over the last
several months toward a possible  settlement of the disputes  between Sonera and
TDS, Aerial and AOC;

WHEREAS, Aerial has engaged in discussions with VoiceStream regarding a possible
business combination between Aerial and VoiceStream;

WHEREAS, as a result of such discussions,  Aerial, TDS, VoiceStream, Holding and
VoiceStream  Subsidiary III Corporation,  a Delaware corporation  ("Sub"),  have
entered into an Agreement and Plan of Reorganization,  dated as of September 17,
1999 (the  "Reorganization  Agreement"),  providing for, among other things, the
merger of Sub with and into Aerial (the  "Merger"),  with Aerial  surviving  the
Merger  as  a   wholly-owned   subsidiary  of  either   VoiceStream  or  Holding
(collectively, "Parent"); and

WHEREAS,  the parties,  each being counseled by their respective attorneys after
extensive  negotiations,  have agreed, in connection with the Merger, to provide
for certain  adjustments to the Sonera  Arrangements and to settle,  resolve and
terminate all claims of any kind,  known or unknown,  which the parties may have
against each other arising on or prior to the date hereof;

NOW THEREFORE,  in  consideration  of the premises and of the mutual  covenants,
conditions  and  promises set forth below,  the  sufficiency  of which is hereby
acknowledged by each of the parties, the parties hereby agree as follows:

                                       -4-

<PAGE>




                                   ARTICLE I
                               BASIS OF AGREEMENT

Section  1.1Nature of Obligations.  (a) The parties agree that the  transactions
contemplated  by Article II, Section 3.1,  Article IV, Article VII,  Section 8.5
and  Articles  IX  through  X of this  Agreement  are not  contingent  upon  the
consummation of the Merger.  Accordingly,  the parties agree that the obligation
to  undertake  the  actions set forth in Article II,  Section  3.1,  Article IV,
Article VII,  Section 8.5 and  Articles IX through X hereof are  effective as of
the date hereof.

(b) The  parties  agree  that the  transactions  contemplated  by  Section  3.2,
Articles V through VI and Article  VIII of this  Agreement  (other than  Section
8.5) are contingent upon consummation of the Merger. Accordingly, in the absence
of  consummation  of the  Merger  for any  reason,  the  parties  shall  have no
obligation to take the actions  contemplated by Section 3.2,  Articles V through
VI and Article  VIII of this  Agreement  (other  than  Section  8.5);  provided,
however,  that the parties shall be required to take the actions contemplated by
Sections 3.2 and 5.1 of this Agreement  immediately prior to the consummation of
the  Merger  if all of the  conditions  required  to be  satisfied  prior to the
consummation of the Merger have been satisfied.

Section  1.2No  Additional  Obligation  to Effect the Merger.  In addition,  the
parties  hereto  acknowledge  and agree  that  this  Agreement  shall  create no
additional obligation on, or

                                       -5-

<PAGE>



additional  commitment by, any of TDS, Aerial,  AOC,  VoiceStream or Holding not
otherwise contained in the Reorganization Agreement to consummate the Merger.

Section  1.3Defined Terms. All terms not otherwise defined herein shall have the
meanings ascribed to them in the Debt/Equity Agreement.


                                   ARTICLE II
                             DEBT/EQUITY CONVERSION

                  Section 2.1 Debt/Equity  Conversion.  The parties hereby agree
that,  with respect to, and as permitted by, the  provisions of the  Debt/Equity
Replacement  Agreement,  dated  as  of  September  17,  1999  (the  "Debt/Equity
Agreement"), among TDS, Aerial, AOC, VoiceStream and Holding:

                  (a) Notices. Neither the "Section 9.1(a) Notice" (as described
in Section 1.1(a) of the Debt/Equity  Agreement) nor the "Section 4.1(d) Notice"
(as described in Section 1.2(a) of the Debt/Equity Agreement) shall be required.

                  (b)  Aggregate  Dollar  Amount,  Per Share Price and Number of
Shares.

                                       -6-

<PAGE>



The aggregate  dollar amount,  per share price and number of shares to be issued
in connection with the equity issuances  contemplated by the following  sections
of the Debt/Equity Agreement shall be as follows,  notwithstanding any provision
in the Investment Agreement or the Debt/Equity Agreement to the contrary:

                           (1)  Sections 1.1(b) and (c):
                                    (A)  TDS Purchase Price:  $420,000,000
                                    (B)  TDS Price Per Company Share: $22.00
                                    (C)  Company Shares:  19,090,909
                                         Company Common Shares:  6,166,758
                                         Company Series A Common Shares:
                                            12,924,151

                           (2)  Section 1.1(d):
                                    (A) Investor Proceeds: $75,000,000
                                    (B) Investor Price Per Company Share: $22.00
                                    (C) Investor Subscription Shares: 3,409,091

                           (3)  Section 1.1(e):
                                    (A) Investor AOC Option Proceeds:  $0
                                    (B) Investor Price Per AOC Option Share: $0
                                    (C) Investor AOC Option Shares:  0


                                       -7-

<PAGE>



                           (4)  Sections 1.2(b) and (c):
                                  (A) Company Subscription Price: $495,000,000
                                  (B) Company Price Per Operating Company Share:
                                      $148.04218
                                  (C) Company Subscription Shares:  3,343,642

                           (5)  Section 1.2(d):
                                  (A) Additional Investor Proceeds: $155,000,000
                                  (B) Investor Price Per Operating Company
                                         Share: $148.04218
                                  (C) Additional Investor Subscription Shares:
                                          1,046,999

                  (c) Closing  Dates;  Sequence;  Place of Closing.  Each of the
First Closing Date (as described in Section 2.1(a) of the Debt/Equity Agreement)
and the Second Closing Date (as described in Section  2.2(a) of the  Debt/Equity
Agreement) shall occur on November 1, 1999, or on such other date as the parties
hereto  shall agree in writing.  Each of the  transactions  contemplated  by the
First Closing shall be consummated prior to the consummation of the transactions
contemplated by the Second  Closing,  and the  transactions  contemplated by the
Second  Closing shall be  consummated  at the Second Closing in the sequence set
forth in Section 2.2(a) of the Debt/Equity Agreement.  Each of the First Closing
and the  Second  Closing  shall  take  place at the  offices  of Sidley & Austin
located in Chicago,  Illinois,  or at such other  location as the parties  shall
agree in writing.

                                       -8-

<PAGE>



                  Section 2.2 Confirmation; Agreement to Purchase. Sonera hereby
confirms  its  agreement  with and  acceptance  of the terms and  provisions  of
Sections 1.1, 1.2, 1.4 through 1.7,  2.1(b) and (c),  2.2(b) and (c), and 2.3 of
the  Debt/Equity  Agreement and agrees to purchase,  and Aerial and AOC agree to
sell to Sonera,  the Investor  Subscription  Shares and the Additional  Investor
Subscription Shares on the terms set forth in Section 2.1 hereof.

                  Section 2.3 Waiver. (a) Except as set forth in the Debt/Equity
Agreement and Sections 2.1 and 2.2 hereof,  Sonera hereby  expressly  waives its
right to  subscribe  for Aerial  Common  Shares  and  Series A Common  Shares of
Aerial, par value $1.00 per share ("Aerial Series A Common Shares" and, together
with Aerial Common Shares,  "Aerial Common Stock")  pursuant to Sections 9.1 and
9.2 of the Investment Agreement,  to subscribe for AOC Common Shares pursuant to
Section 4.1 of the  Investment  Agreement and to purchase  additional AOC Common
Shares  pursuant to the AOC Option as set forth in Section 4.5 of the Investment
Agreement,  in each  case in  connection  with the  issuances  set  forth in the
Debt/Equity  Agreement by Aerial of Aerial Common Stock to TDS and by AOC of AOC
Common  Shares to Aerial.  No notice or action  shall be required to be given or
taken pursuant to the Investment Agreement in connection with the foregoing.

                  (b) In addition,  Sonera hereby  expressly waives its right to
purchase  additional AOC Common Shares pursuant to the Three-Year Option (as set
forth in Section 4.2 of the Investment  Agreement) and the Seven-Year Option (as
set forth in

                                       -9-

<PAGE>



Section 4.3 of the Investment  Agreement) from the date hereof until the earlier
to occur of (1) the Effective Time (as defined in the Reorganization Agreement),
at which time such right will be  terminated  pursuant to Article VI hereof,  or
(2) the termination of the Reorganization Agreement.

                  Section  2.4  Covenant  of TDS,  Aerial and AOC.  Each of TDS,
Aerial and AOC hereby  covenant not to amend Sections 1.1, 1.2, 1.4 through 1.7,
2.1(b) and (c),  2.2(b) and (c),  and 2.3 of the  Debt/Equity  Agreement  in any
manner  which  would have a material  adverse  effect on the rights of Sonera or
Sonera U.S. under this Agreement.


                                   ARTICLE III
                      SURRENDER OF SHARES FOR CANCELLATION

                  Section  3.1  Initial   Surrender   of  Disputed   Shares  for
Cancellation.  (a) On the  First  Closing  Date in  connection  with  the  First
Closing,  Sonera  shall  surrender  to AOC for  cancellation  317,108 AOC Common
Shares (the "Surrendered Shares"), representing one-half of the Disputed Shares.
The parties agree that such surrender by Sonera of the Surrendered  Shares shall
under no circumstances be deemed to be an admission by either Sonera, on the one
hand, or TDS, Aerial or AOC, on the other hand, of the validity of any Claim (as
defined in Section 8.3 hereof) by any other party with  respect to the  Disputed
Shares or otherwise  prejudice any party with respect to any Claim in connection
with the Disputed Shares.

                                      -10-

<PAGE>



                  (b)  In  the  event  that  the  Reorganization   Agreement  is
terminated  and  it  is  ultimately  determined  by a  judicial  or  arbitration
tribunal, the decision of which is not appealed,  that Sonera is entitled to the
return of any of the  Surrendered  Shares,  then AOC shall promptly  return such
number of Surrendered Shares to Sonera; provided, however, that if the return of
any of such  Surrendered  Shares  to  Sonera  would  cause  AOC to no  longer be
consolidated  with Aerial for tax purposes  (the "Excess AOC  Shares"),  then in
lieu of such  Excess AOC Shares  Aerial  shall  issue to Sonera  that  number of
Aerial  Common  Shares  equal to the  product  of (1) such  number of Excess AOC
Shares  multiplied by (2) the Exchange  Rate  Applicable to Aerial Common Shares
(as defined in the Investment Agreement) then in effect;  provided further, that
in the event the  issuance to Sonera of any of such Aerial  Common  Shares would
cause Aerial to no longer be consolidated with TDS for tax purposes (the "Excess
Aerial Shares"),  then in lieu of such Excess Aerial Shares the parties agree to
negotiate an appropriate  and equitable  resolution  with respect  thereto which
will not cause either AOC or Aerial to fail to remain  consolidated  with Aerial
or TDS,  respectively,  for tax  purposes,  but which will  provide for a prompt
payment to Sonera of  consideration of equivalent value to the fair market value
of such Excess Aerial Shares determined at the time of such resolution.

                  Section  3.2  Subsequent  Surrender  of  Disputed  Shares  for
Cancellation.  Sonera shall  surrender  to AOC the  remaining  317,108  Disputed
Shares in the event that the  Tag-Along  Transaction  (as defined in Section 4.1
hereof) is consummated, such surrender to be effected pursuant to the provisions
of Section 5.1 hereof. Such

                                      -11-

<PAGE>



surrender shall be in full satisfaction of the adjustments to the Purchase Price
as  required by Section  2.3(a) of the  Purchase  Agreement  and all Claims with
respect to the Disputed Shares shall be released in accordance with Article VIII
hereof

                                   ARTICLE IV
                           EXERCISE OF TAG-ALONG RIGHT

                  Section  4.1  Exercise  of  Tag-Along  Right.   Sonera  hereby
exercises  the  tag-along  right as set forth in Section 10.6 of the  Investment
Agreement  (the  "Tag-  Along  Right")  in  connection  with  the  Merger.   The
transactions  contemplated by the Tag-Along Right (the "Tag-Along  Transaction")
shall be consummated as set forth in Article V hereof. No notice or action shall
be  required  to be given or  taken  pursuant  to the  Investment  Agreement  in
connection with such exercise,  but Aerial will provide Sonera at least four (4)
business days prior notice of the date on which the Tag-Along  Transaction  will
occur.


                                    ARTICLE V
                      CONSUMMATION OF TAG-ALONG TRANSACTION

                  Section 5.1  Exchange of AOC Common  Shares.  (a)  Immediately
prior to the Effective Time,  Sonera shall exchange all of the AOC Common Shares
then owned by Sonera or its  Affiliates (as defined in Section 10.16 hereof) for
that number of Aerial

                                      -12-

<PAGE>



Common  Shares equal to the product of: (1) the  difference of (A) the aggregate
number of AOC Common Shares set forth on the certificates then held by Sonera or
its Affiliates less (B) 317,108;  multiplied by (2) the Exchange Rate Applicable
to Aerial Common Shares then in effect.

                  (b) To effect  such  exchange,  (1)  Sonera  shall  deliver to
Aerial one or more certificates,  duly endorsed or accompanied by an appropriate
instrument of transfer,  in form  satisfactory to Aerial,  representing such AOC
Common Shares and (2) Aerial shall deliver to Sonera a certificate issued in the
name of Sonera  representing  such Aerial Common  Shares.  No fractional  Aerial
Common Shares, or scrip representing  fractional Aerial Common Shares,  shall be
issued upon such  exchange,  but in lieu  thereof  Aerial shall pay to Sonera in
cash an amount equal to the product of (1) such  fractional  Aerial Common Share
multiplied by (2) the Twenty-Day  Aerial Average ending on the third trading day
prior to the day on which the Effective Time occurs.

                  Section 5.2 Exchange of Aerial Common Shares. At the Effective
Time,  Sonera  shall:  (a) tender each of the Aerial Common Shares then owned by
Sonera or its Affiliates,  including without limitation each Aerial Common Share
obtained by Sonera  pursuant  to the  transactions  contemplated  by Section 5.1
hereof and the Debt/Equity Agreement as modified by this Agreement,  in exchange
for  the  Per  Share  Stock  Consideration  (as  defined  in the  Reorganization
Agreement);  and  (b)  execute  and  deliver  such  other  documents  as  may be
reasonably required in connection therewith,

                                      -13-

<PAGE>



including the tax certificate in the form attached hereto as Exhibit 5.2.


                                   ARTICLE VI
                   TERMINATION OF CERTAIN SONERA ARRANGEMENTS

                  Section 6.1 Termination of Certain Sonera Arrangements.  As of
the Effective Time, each of the Purchase  Agreement,  the Investment  Agreement,
the Registration Rights Agreement, the Management Side Letter, the Joint Venture
Agreement and the  Supplemental  Agreement  shall terminate and be of no further
force or effect.

                                   ARTICLE VII
                              ADDITIONAL COVENANTS

                  Section 7.1  Additional  Purchases by Sonera of Aerial Shares.
Effective  as of  September  27,  1999,  TDS,  Aerial and AOC  hereby  waive the
provisions of Section 9.5 of the  Investment  Agreement  during the term of this
Agreement.  In the event that the Reorganization  Agreement is terminated,  such
waiver shall terminate concurrently therewith.

                  Section  7.2  Suspension  of  Certain   Subscription   Rights.
Notwithstanding  the provisions of Section  4.1(b) of the Investment  Agreement,
the parties agree that all

                                      -14-

<PAGE>



of the proceeds  from the sale of Aerial  Common Stock for the period  beginning
January 1, 1999 pursuant to all stock option, employee stock purchase, 401(k) or
other  employee  benefit  programs  maintained by Aerial shall be accumulated by
Aerial and shall not be transferred to AOC unless the  Reorganization  Agreement
is  terminated.  In the event that the  Reorganization  Agreement is terminated,
Aerial shall transfer to AOC such proceeds  accumulated through the date of such
termination  in exchange for AOC Common Shares within 90 days after  termination
of the  Reorganization  Agreement and Sonera shall have the subscription  rights
with respect to such transfer as set forth in Section  4.1(c) of the  Investment
Agreement.


                                  ARTICLE VIII
                          RELEASES; COVENANT NOT TO SUE

                  Section  8.1  Release  by Sonera  and  Sonera  U.S.  As of the
Effective Time, Sonera and Sonera U.S., on behalf of each of themselves and each
of their respective  predecessors,  successors,  subsidiaries,  Affiliates,  and
assigns,  and each and every  person who may purport to assert  rights or claims
through them or on their behalf (collectively,  the "Sonera Releasing Parties"),
individually and collectively, hereby release and forever discharge each of TDS,
Aerial, AOC, VoiceStream and Holding, their respective predecessors, successors,
subsidiaries,  Affiliates,  and assigns,  the  officers,  directors,  employees,
agents, attorneys,  investment bankers, consultants, and representatives of each
of them acting in their capacity as such

                                      -15-

<PAGE>



(collectively,  the "TDS/VoiceStream Released Parties"),  from, and covenant and
agree not to sue any of the TDS/VoiceStream Released Parties with regard to, any
Claim (as defined in Section 8.3 hereof) by a Sonera  Releasing  Party against a
TDS/VoiceStream Released Party.

                  Section  8.2  Release by TDS,  Aerial,  AOC,  VoiceStream  and
Holding. As of the Effective Time, TDS, Aerial, AOC, VoiceStream and Holding, on
behalf  of  each  of  themselves  and  each of  their  respective  predecessors,
successors, subsidiaries, Affiliates, and assigns, and each and every person who
may  purport  to  assert  rights  or  claims  through  them or on  their  behalf
(collectively,  the  "TDS/VoiceStream  Releasing  Parties"),   individually  and
collectively,  hereby  release and forever  discharge  each of Sonera and Sonera
U.S., their respective predecessors,  successors, subsidiaries,  Affiliates, and
assigns,  the officers,  directors,  employees,  agents,  attorneys,  investment
bankers,  consultants,  and  representatives  of each of them  acting  in  their
capacity  as such  (collectively,  the "Sonera  Released  Parties"),  from,  and
covenant and agree not to sue any of the Sonera Released Parties with regard to,
any Claim by a TDS/VoiceStream Releasing Party against a Sonera Released Party.

                  Section  8.3 Claim.  For  purposes  of this  Article  VIII,  a
"Claim"  shall  mean  any  demand,  action,  claim,  counterclaim,  cross-claim,
liability,  obligation, debt, cause of action, or lawsuit existing now or in the
future,  whether currently known or unknown,  accrued or unaccrued,  foreseen or
unforeseen,  whether legal, equitable,  derivative, class, or of any other form,
and whether in contract, tort, statutory, or of any other

                                      -16-

<PAGE>



nature,  arising from or relating to any alleged act or failure to act occurring
at any time through the date hereof,  including without  limitation any Claim in
connection with (a) the Sonera  Arrangements,  (b) the Disputed Shares,  (c) the
Spin-Off,   (d)  the  Reorganization   Agreement  and  (e)  the  agreements  and
transactions contemplated by the Reorganization Agreement, including the Merger.

                  Section  8.4  Bring-Down  of Release to  Effective  Date.  (a)
Subject  to  paragraph  (b)  hereof,  each of the  parties  agree to  execute an
amendment  to  this  Agreement  as  of  the  Effective  Time  (the   "Bring-Down
Amendment")  to amend Section 8.3 hereof by deleting the words "through the date
hereof" and replacing them with the words "through the Effective Time".

                  (b) The  obligation  of each party to execute  the  Bring-Down
Amendment shall be contingent upon the execution of the Bring-Down  Amendment by
each other  party.  The  obligation  of Sonera and Sonera  U.S.  to execute  the
Bring-Down  Amendment  is further  conditioned  upon (a) the  delivery by TDS to
Sonera  (by   delivery  of  at  least  one  copy  to  each  of  Sonera  and  its
representative  identified  in  Section  10.4  hereof)  of the final form of the
Reorganization  Agreement and related  agreements (as referred to in Section 8.3
hereof) not less than 30 days prior to the  Effective  Time and (b) Sonera being
advised on a timely basis of material  changes or  developments  relating to the
Merger. Except as set forth in the immediately preceding two sentences,  a party
shall  not  refuse  to  execute  the  Bring-Down  Amendment  unless  each of the
following  conditions  is  satisfied:  (1)  such  party  has  made a good  faith
determination

                                      -17-

<PAGE>



that (A) such  party has a  demand,  claim or cause of  action  arising  from or
relating to any alleged  act or failure to act  occurring  after the date hereof
and prior to the Effective Time (a "Bring-Down Claim"), (B) the facts underlying
the Bring-Down  Claim provide a reasonable basis to support the Bring-Down Claim
and (c) such  party  intends to pursue  such  Bring-Down  Claim;  (2) such party
delivers  prior to the  Effective  Time to each of the  other  parties a written
certification  by an  officer  of  such  party  specifying  the  nature  of  the
Bring-Down  Claim and the party it intends to pursue;  and (3) such party  files
such  Bring-Down  Claim with a judicial or arbitration  tribunal  within 60 days
after the date of such written certification.

                  (c) The parties agree that neither the failure of any party to
execute and deliver the Bring-Down  Amendment nor any other provision  contained
in  this  Agreement  shall  affect  the  obligations  under  the  Reorganization
Agreement  of any  party  to the  Reorganization  Agreement  to  consummate  the
transactions contemplated by the Reorganization Agreement.

                  Section  8.5  Covenant  Not to Sue.  Each of the  parties,  on
behalf of itself and its  Affiliates,  hereby  expressly  agrees not to file any
lawsuit or initiate any action before any judicial or arbitration  tribunal with
respect to any Claims until the earlier to occur of: (1) the Effective  Time, at
which time all such Claims  (other than any Bring- Down Claims in the event that
the Bring-Down Amendment is not fully executed and delivered pursuant to Section
8.4  hereof)  will  be  released  pursuant  to  this  Article  VIII;  or (2) the
termination of the Reorganization Agreement, in which case all applicable

                                      -18-

<PAGE>



statutes of  limitations  periods with respect to such Claims shall be deemed to
have been  tolled  during the period  solely from the date hereof to the date of
such termination of the Reorganization Agreement.



                                   ARTICLE IX
                                   TERMINATION

                  Section 9.1  Termination.  This Agreement shall terminate upon
the earlier to occur of the following:

                  (a) the  termination  of the  Reorganization  Agreement in the
                      event that the Effective Time has not occurred; or

                  (b) the mutual written consent of the parties hereto.

                                    ARTICLE X

                                  MISCELLANEOUS

                  Section 10.1 No Admission.  Neither this  Agreement nor any of
the negotiations in connection  herewith or any prior  negotiations  between the
parties or their employees, agents or representatives,  shall be construed as or
deemed to be an

                                      -19-

<PAGE>



admission  of the truth of any  allegation  or the  validity of any Claim by any
party against another.

                  Section 10.2 Equitable Remedies. The parties hereto agree that
irreparable  damage would occur in the event that any of the  provisions of this
Agreement  were not  performed  in  accordance  with the  specific  terms of the
provisions or were otherwise breached. It is accordingly agreed that the parties
shall be entitled to an injunction or  injunctions  to prevent  breaches of this
Agreement and to enforce  specifically  the terms and  provisions  hereof in any
court  referenced in Section  10.13 hereof,  this being in addition to any other
remedy to which they are entitled at law or in equity. Each party agrees that it
will not assert, as a defense against a claim for specific  performance or other
equitable  remedy,  that the party seeking such equitable remedy has an adequate
remedy at law.

                  Section 10.3 Remedies Cumulative. Except as otherwise provided
herein, each or any of the rights and remedies in this Agreement  provided,  and
each or any of the  rights  and  remedies  allowed  at law and in equity in like
case, shall be cumulative,  and the exercise of one right or remedy shall not be
exclusive  of the right to  exercise  or  resort  to any or any other  rights or
remedies provided in this Agreement or at law or in equity.

                  Section  10.4   Notices.   All   notices,   claims  and  other
communications  hereunder  shall  be in  writing  and  shall  be  given  by hand
delivery, facsimile, or overnight

                                      -20-

<PAGE>



air courier guaranteeing next day delivery:

                  (a)      if to TDS, at:

                           Telephone and Data Systems, Inc.
                           30 North LaSalle Street
                           Suite 4000
                           Chicago, Illinois  60602
                           Attention:  Mr. LeRoy T. Carlson, Jr.
                           Phone:   (312) 630-1900
                           Fax:     (312) 630-9299

                  with a copy (which shall not constitute notice) to:

                           Aerial Communications, Inc.
                           8410 West Bryn Mawr Avenue
                           Suite 1100
                           Chicago, Illinois  60631
                           Attention:  Mr. Donald W. Warkentin
                           Phone:   (773) 399-4145
                           Fax:     (773) 399-7997

                  with a copy (which shall not constitute notice) to:

                           Sidley & Austin
                           One First National Plaza
                           42nd Floor - SW
                           Chicago, Illinois  60603
                           Attention:  Michael G. Hron, Esq.
                           Phone:   (312) 853-2030
                           Fax:     (312) 853-7036

                  (b)      if to Aerial or AOC, at:

                           Aerial Communications, Inc.
                           8410 West Bryn Mawr Avenue
                           Suite 1100
                           Chicago, Illinois  60631
                           Attention:  Mr. Donald W. Warkentin
                           Phone:   (773) 399-4145
                           Fax:     (773) 399-7997


                                      -21-

<PAGE>



                  with a copy (which shall not constitute notice) to:

                           Telephone and Data Systems, Inc.
                           30 North LaSalle Street
                           Suite 4000
                           Chicago, Illinois  60602
                           Attention:  Mr. LeRoy T. Carlson, Jr.
                           Phone:   (312) 630-1900
                           Fax:     (312) 630-9299

                  with a copy (which shall not constitute notice) to:

                           Sidley & Austin
                           One First National Plaza
                           42nd Floor - SW
                           Chicago, Illinois  60603
                           Attention:  Michael G. Hron, Esq.
                           Phone:   (312) 853-2030
                           Fax:     (312) 853-7036

                  (c)      if to Sonera or Sonera U.S., at:

                           Sonera Ltd.
                           P.O. Box 106
                           FIN-00051-TELE
                           Teollisuuskatu 15, HELSINKI
                           Attention:  Maire Laitinen, Esq.
                           Phone:   011-35-8-2040-3641
                           Fax:     011-35-8-2040-3414

                  with a copy (which shall not constitute notice) to:

                           Patton Boggs, L.L.P.
                           2550 M. Street, N.W.
                           Washington, D.C.  20037-1350
                           Attention:  Richard M. Stolbach, Esq.
                           Phone:   (202) 457-6324
                           Fax:     (202) 457-6315

                  (d)  if to VoiceStream or Holding, at
                           VoiceStream Wireless Corporation
                           3650 131st Avenue SE, Suite 400
                           Bellevue, WA  98006
                           Attn:  General Counsel

                                      -22-

<PAGE>



                           Phone:  (425) 586-8000
                           Fax:    (425) 586-8080

                  with a copy (which shall not constitute notice) to:
                           Preston Gates & Ellis LLP
                           5000 Columbia Center
                           701 Fifth Avenue
                           Seattle, WA  98104
                           Attn:  Richard B. Dodd, Esq.
                           Phone:  (206) 623-7580
                           Fax:    (206) 623-7022

or at such other address as any party may from time to time furnish to the other
parties by a notice  given in  accordance  with the  provisions  of this Section
10.4.  All such  notices  and  communications  shall be deemed to have been duly
given at the time  delivered  by hand,  if  personally  delivered;  when receipt
confirmed,  if sent by  facsimile;  and on the next  business  day after  timely
delivery  to  the  courier,   if  sent  by  an  overnight  air  courier  service
guaranteeing next day delivery.

                  Section 10.5 Entire Agreement.  This Agreement, and the Sonera
Arrangements as amended hereby, together with the schedules and exhibits annexed
hereto and thereto,  contain the entire  understanding  among the parties hereto
concerning  the subject  matter  hereof and this  Agreement  may not be changed,
modified,  altered or terminated  except by an agreement in writing  executed by
the parties hereto.

                  Section 10.6 Waivers.  No provision in this Agreement shall be
deemed waived  except by an  instrument  in writing  signed by the party waiving
such provision

                                      -23-

<PAGE>



and any waiver by any party of any of its rights under this  Agreement or of any
breach of this Agreement shall not constitute a waiver of any other rights or of
any other or future breach.

                  Section 10.7 Governing Law. This Agreement  shall be construed
in  accordance  with  and  subject  to the laws and  decisions  of the  State of
Delaware applicable to contracts made and to be performed entirely therein.

                  Section 10.8  Counterparts.  This Agreement may be executed in
several  counterparts  hereof,  and by the different  parties hereto on separate
counterparts  hereof, each of which shall be an original;  but such counterparts
shall together constitute one and the same instrument.

                  Section 10.9 Expenses.  Each party shall bear its own expenses
incident to the negotiation, preparation, authorization and consummation of this
Agreement  and the  transactions  contemplated  hereby,  including  all fees and
expenses of its counsel and  accountants,  whether or not such  transactions are
consummated.

                  Section 10.10 Successors and Assigns.  This Agreement shall be
binding upon and inure to the benefit of the parties hereto and their respective
successors and permitted assigns; provided,  however, that the assignment of the
rights or the  obligations  of any party (other than to a successor by operation
of law) shall not be permitted  without the prior  written  consent of the other
parties. Notwithstanding the

                                      -24-

<PAGE>



immediately  preceding  sentence,  Sonera may  assign  the right to acquire  the
Investor  Subscription  Shares and the Additional  Investor  Subscription Shares
referenced  in this  Agreement  and the  Debt/Equity  Agreement  to a direct  or
indirect wholly-owned subsidiary of Sonera, provided that such subsidiary agrees
to be bound by, and Sonera  guarantees the performance of such subsidiary under,
this Agreement and the Investment Agreement.

                  Section 10.11 Further Assurances.  Each party hereto shall, at
the request of any other party  hereto,  from time to time,  execute and deliver
such  other  assignments,  transfers,  conveyances  and  other  instruments  and
documents  and do and  perform  such other acts and things as may be  reasonably
necessary or desirable for effecting complete consummation of this Agreement and
the transactions herein contemplated.

                  Section  10.12  Disclosures.  (a) Each party hereto  agrees to
maintain  the  confidentiality  of the  terms of this  Agreement  and  shall not
disclose   them  to  third   parties,   except  as   necessary  to  its  agents,
representatives,  bankers,  investment  bankers,  counsel and  employees who are
informed of the requirement of confidentiality,  or as otherwise required by law
(including the  requirement of TDS,  Aerial,  VoiceStream or Holding to disclose
such  terms  under  the  federal  securities  laws or  under  the  rules  of any
securities  exchange on which its  securities  are  listed,  and  including  the
requirement  of Sonera or any of its Affiliates to disclose such terms under the
securities laws of Finland or other applicable jurisdiction).

                                      -25-

<PAGE>



                  (b) No public  announcement  with  regard to the  transactions
contemplated  hereby or the material  terms hereof (other than the press release
or releases to be issued by the parties  hereto on September  20, 1999) shall be
issued by any party hereto without the mutual prior written consent of the other
parties,  except to the extent  that the  parties are unable to agree on a press
release  and legal  counsel  for one  party is of the  opinion  that such  press
release is required by law.

                  Section 10.13 Jurisdiction; Consent to Service of Process. (a)
Each party hereby  irrevocably  consents and submits to the  jurisdiction of the
United States  District  Court for the District of Delaware and any court of the
State of Delaware,  in any action,  suit or proceeding arising out of, resulting
from or relating to this  Agreement,  and agrees that any such  action,  suit or
proceeding  shall be brought only in such courts (and waives any objection based
on forum non conveniens or any objection to venue therein);  provided,  however,
that such consent to jurisdiction is solely for the purpose  referred to in this
Section  10.13(a)  and shall not be  deemed  to be a general  submission  to the
jurisdiction  of said  courts  or the  State  of  Delaware  other  than for such
purpose.

                  (b) Each of Sonera and Sonera U.S. hereby irrevocably  appoint
The Corporation Trust Company, at its office at 1209 Orange Street,  Wilmington,
Delaware,  United States of America, its lawful agent and attorney to accept and
acknowledge  service of any process against it in any action, suit or proceeding
arising out of, resulting from or relating to this Agreement, and upon whom such
process  may be served,  with the same  effect as if it were a  resident  of the
State of Delaware, and

                                      -26-

<PAGE>



had been lawfully served with such process in such jurisdiction,  and waives all
claim of error  by  reason  of such  service,  provided  that in the case of any
service upon such agent and attorney,  TDS, Aerial, AOC, VoiceStream or Holding,
as  applicable,  shall also deliver a copy thereof to Sonera or Sonera U.S.,  as
applicable,  at the address and in the manner  specified in Section 10.4 hereof.
In the event that such agent and attorney resigns or otherwise becomes incapable
of acting as such, each of Sonera and Sonera U.S. will appoint a successor agent
and attorney in Wilmington,  Delaware,  reasonably  satisfactory to TDS, Aerial,
AOC,  VoiceStream  and Holding,  with like  powers,  or if Sonera or Sonera U.S.
fails to make such  appointment,  Sonera or Sonera U.S., as  applicable,  hereby
authorizes  each of TDS,  Aerial,  AOC,  VoiceStream and Holding to appoint such
agent for Sonera or Sonera U.S., as applicable. Sonera and Sonera U.S. shall pay
the annual fee due to The Corporation  Trust Company or such successor agent for
acting in such  capacity;  provided,  however,  that if neither Sonera or Sonera
U.S. shall make such payment,  then each of TDS,  Aerial,  AOC,  VoiceStream and
Holding shall have the right to do so.

                  Section 10.14 No Claim of Immunity.  Each of Sonera and Sonera
U.S. agrees that, to the extent that it or any of its property,  its Affiliates,
or  property  of its  Affiliates  is or  becomes  entitled  at any  time  to any
immunity,  on the grounds of sovereignty or otherwise,  based upon its status as
an agency or instrumentality of government, from any arbitration,  legal action,
suit or proceeding  or from setoff or  counterclaim  relating to this  Agreement
from the  jurisdiction  of any  arbitrator or competent  court,  from service of
process, from attachment prior to judgment, from

                                      -27-

<PAGE>



attachment  in aid of  execution  of a judgment,  from  execution  pursuant to a
judgement  or  arbitration  award,  or  from  any  other  legal  process  in any
jurisdiction,  it, for itself,  its  Affiliates,  its  property  and that of its
Affiliates,  expressly,  irrevocably and unconditionally  agrees not to plead or
claim,  any such immunity  with respect to such matters  arising with respect to
this  Agreement or the subject  matter hereof  (including any obligation for the
payment of money).

                  Section 10.15 Severability. In the event any provision of this
Agreement  is found to be  invalid  or  unenforceable  in whole or in part,  the
remaining  provisions of this  Agreement  nevertheless  shall be binding and the
invalid or unenforceable  provision shall be replaced by a valid and enforceable
provision  which comes closest to the intent or economic effect of the provision
to be replaced.

                  Section  10.16  Affiliate.  For  purposes  of this  Agreement,
"Affiliate"  shall mean,  with respect to any party hereto,  any  corporation or
other business entity which, directly or indirectly,  through stock ownership or
through any other  arrangement,  controls,  is  controlled by or is under common
control with, such party.  The term "control" shall mean the possession,  direct
or indirect,  of the power to direct or cause the direction of the management or
policies of such person, whether by reason of ownership of voting stock or other
equity interests, by contract or otherwise.
                                    * * * * *

                                      -28-

<PAGE>



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


                                             By:      /s/ Murray L. Swanson
                                                  ----------------------------
                                             Name:    Murray L. Swanson
                                             Title: Authorized Representative

                                             SONERA CORPORATION U.S.


                                             By:  /s/ Murray L. Swanson
                                                -------------------------------
                                             Name:    Murray L. Swanson
                                             Title:   Authorized Representative

                                             TELEPHONE AND DATA SYSTEMS, INC.


                                             By:      /s/ LeRoy T. Carlson
                                                  ----------------------------
                                             Name:    LeRoy T. Carlson
                                             Title:   Chairman

                                             AERIAL COMMUNICATIONS, INC.


                                             By:      /s/ LeRoy T. Carlson, Jr.
                                                  -----------------------------
                                             Name:    LeRoy T. Carlson, Jr.
                                             Title:   Chairman

                                             AERIAL OPERATING COMPANY, INC.


                                             By:  /s/ Don W. Warkentin
                                                ----------------------------
                                             Name:    Don W. Warkentin
                                             Title:   President




                                      -29-

<PAGE>


In addition,  this Agreement is signed by the undersigned solely for purposes of
Articles I through II and VIII through X hereof.

                                  VOICESTREAM WIRELESS CORPORATION


                                  By:  /s/ Cregg B. Baumbaugh
                                     ---------------------------------------
                                  Name:    Cregg B. Baumbaugh
                                  Title:   Executive Vice President - Strategy,
                                           Finance and Development

                                  VOICESTREAM WIRELESS HOLDING
                                  CORPORATION


                                  By:  /s/ Cregg B. Baumbaugh
                                     -----------------------------------------
                                  Name:    Cregg B. Baumbaugh
                                  Title:   Executive Vice President - Strategy,
                                           Finance and Development




               SIGNATURE PAGE TO SETTLEMENT AGREEMENT AND RELEASE,
                   AMONG SONERA LTD., SONERA CORPORATION U.S.,
                        TELEPHONE AND DATA SYSTEMS, INC.,
                          AERIAL COMMUNICATIONS, INC.,
                       AND AERIAL OPERATING COMPANY, INC.
                AND JOINED IN BY VOICESTREAM WIRELESS CORPORATION
                  AND VOICESTREAM WIRELESS HOLDING CORPORATION


                                      -30-

<PAGE>




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