Document:

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                                                                     EXHIBIT 4.1

COMMON STOCK                                                        COMMON STOCK
PAR VALUE $.001                             This Certificate is Transferrable in
                                                     New York, NY or Chicago, IL
CERTIFICATE                                                               SHARES
NUMBER

                              [AIRVANA, INC. LOGO]

                                  AIRVANA, INC.

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                                                                CUSIP 00950V 101
                                             SEE REVERSE FOR CERTAIN DEFINITIONS

THIS CERTIFIES THAT

IS THE OWNER OF

         FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF

Airvana, Inc. (hereinafter called the "Company"), transferable on the books of
the Company in person or by duly authorized attorney, upon surrender of this
Certificate properly endorsed. This Certificate and the shares represented
hereby, are issued and shall be held subject to all of the provisions of the
Certificate of Incorporation, as amended, and the By-Laws, as amended, of the
Company (copies of which are on file with the Company and with the Transfer
Agent), to all of which each holder, by acceptance hereof, assents. This
Certificate is not valid until countersigned and registered by the Transfer
Agent and Registrar.

Witness the facsimile seal of the Company and facsimile signatures of its duly
authorized officers.

                                                                Dated:

/s/ Randall S. Battat                       [Seal]
------------------------
Director, President and Chief
Executive Officer

/s/ David P. Gamache
------------------
Treasurer

                                                   COUNTERSIGNED AND REGISTERED:
                                           COMPUTERSHARE INVESTOR SERVICES, LLC.
                                                                       (Chicago)
                                                    Transfer Agent and Registrar

                                           By:
                                              ----------------------------------
                                                            Authorized Signature

AIRVANA, INC.

<PAGE>

  The following abbreviations, when used in the inscription on the face of this
     certificate, shall be construed as though they were written out in full
                  according to applicable laws or regulations:

<TABLE>
<S>      <C>                                  <C>                <C>
TEN COM  - as tenants in common               UNIF GIFT MIN ACT  -                      Custodian
                                                                        (Cust)                          (Minor)

TEN ENT  - as tenants by the entireties                           under Uniform Gifts to Minors
                                                                  Act
                                                                      (State)
JT TEN   - as joint tenants with right of
           survivorship and not as            UNIF TRF MIN ACT -                Custodian (until age  )
           tenants in common                                      (Cust)                                      (Minor)

                                                                  under Uniform Transfers to Minors Act
                                                                                                              (State)
</TABLE>

      Additional abbreviations may also be used though not in the above list.

THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH SHAREHOLDER WHO SO REQUESTS, A
SUMMARY OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING,
OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OF THE COMPANY AND THE
QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND RIGHTS, AND
THE VARIATIONS IN RIGHTS, PREFERENCES AND LIMITATIONS DETERMINED FOR EACH
SERIES, WHICH ARE FIXED BY THE CERTIFICATE OF INCORPORATION OF THE COMPANY, AS
AMENDED, AND THE RESOLUTIONS OF THE BOARD OF DIRECTORS OF THE COMPANY, AND THE
AUTHORITY OF THE BOARD OF DIRECTORS TO DETERMINE VARIATIONS FOR FUTURE SERIES.
SUCH REQUEST MAY BE MADE TO THE OFFICE OF THE SECRETARY OF THE COMPANY OR TO THE
TRANSFER AGENT. THE BOARD OF DIRECTORS MAY REQUIRE THE OWNER OF A LOST OR
DESTROYED STOCK CERTIFICATE, OR HIS LEGAL REPRESENTATIVES, TO GIVE THE COMPANY A
BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND REGISTRARS AGAINST ANY CLAIM
THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE ALLEGED LOSS OR DESTRUCTION OF
ANY SUCH CERTIFICATE.

                                                PLEASE INSERT SOCIAL SECURITY OR
                                                     OTHER IDENTIFYING NUMBER OF
                                                                        ASSIGNEE

For value received,          hereby sell, assign
and transfer unto

                  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS,
                    INCLUDING POSTAL ZIP CODE, OF ASSIGNEE)

     Shares of the capital stock represented by the within Certificate, and do
hereby irrevocably constitute and appoint Attorney to transfer the said stock on
the books of the within named Corporation with full power of substitution in the
premises.

Dated                   20,
                                    Signature(s) Guaranteed: Medallion Guarantee
                                                        Stamp
                                        THE SIGNATURE(s) SHOULD BE GUARANTEED
Signature:
          -------------------------

Signature:                               BY AN ELIGIBLE GUARANTOR INSTITUTION
          -------------------------      (Banks, Stockbrokers, Savings and Loan
        Notice: The signature to this    Associations and Credit Unions) WITH
           assignment must correspond    MEMBERSHIP IN AN APPROVED SIGNATURE
           with the name as written      GUARANTEE MEDALLION PROGRAM PURSUANT TO
           upon the face of the          S.E.C. Rule 17Ad-15
           certificate, in every
           particular, without
           alteration or enlargement,
           or any change whatever.<PAGE>

                                                                    Exhibit 10.1

                                  AIRVANA, INC.

                      2000 STOCK INCENTIVE PLAN, AS AMENDED

     1.   Purpose.

     The purpose of this 2000 Stock Incentive Plan, as amended (the "Plan") of
Airvana, Inc., a Delaware corporation (the "Company"), is to advance the
interests of the Company's stockholders by enhancing the Company's ability to
attract, retain and motivate persons who make (or are expected to make)
important contributions to the Company by providing such persons with equity
ownership opportunities and performance-based incentives and thereby better
aligning the interests of such persons with those of the Company's stockholders.
Except where the context otherwise requires, the term "Company" shall include
any of the Company's present or future subsidiary corporations as defined in
Section 424(f) of the Internal Revenue Code of 1986, as amended, and any
regulations promulgated thereunder (the "Code").

     2.   Eligibility.

     All of the Company's employees, officers, directors, consultants and
advisors are eligible to be granted options, restricted stock awards, or other
stock-based awards (each, an "Award") under the Plan. Each person who has been
granted an Award under the Plan shall be deemed a "Participant".

     3.   Administration, Delegation.

          (a) Administration by Board of Directors. The Plan will be
administered by the Board of Directors of the Company (the "Board"). The Board
shall have authority to grant Awards and to adopt, amend and repeal such
administrative rules, guidelines and practices relating to the Plan as it shall
deem advisable. The Board may correct any defect, supply any omission or
reconcile any inconsistency in the Plan or any Award in the manner and to the
extent it shall deem expedient to carry the Plan into effect and it shall be the
sole and final judge of such expediency. All decisions by the Board shall be
made in the Board's sole discretion and shall be final and binding on all
persons having or claiming any interest in the Plan or in any Award. No director
or person acting pursuant to the authority delegated by the Board shall be
liable for any action or determination relating to or under the Plan made in
good faith.

          (b) Delegation to Executive Officers. To the extent permitted by
applicable law, the Board may delegate to one or more executive officers of the
Company the power to make Awards and exercise such other powers under the Plan
as the Board may determine, provided that the Board shall fix the maximum number
of shares subject to Awards and the maximum number of shares for any one
Participant to be made by such executive officers.

          (c) Appointment of Committees. To the extent permitted by applicable
law, the Board may delegate any or all of its powers under the Plan to one or
more committees or subcommittees of the Board (a "Committee"). If and when the
common stock, $.001 par value per share, of the Company (the "Common Stock") is
registered under the Securities Exchange Act of 1934 (the "Exchange Act"), the
Board shall appoint one such Committee of not less than

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two members, each member of which shall be an "outside director" within the
meaning of Section 162(m) of the Code and a "non-employee director" as defined
in Rule 16b-3 promulgated under the Exchange Act. All references in the Plan to
the "Board" shall mean the Board or a Committee of the Board or the executive
officer referred to in Section 3(b) to the extent that the Board's powers or
authority under the Plan have been delegated to such Committee or executive
officer.

     4.   Stock Available for Awards.

          (a) Number of Shares. Subject to adjustment under Section 8, Awards
may be made under the Plan for up to 23,406,012 shares of Common Stock. If any
Award expires or is terminated, surrendered or canceled without having been
fully exercised or is forfeited in whole or in part or results in any Common
Stock not being issued, the unused Common Stock covered by such Award shall
again be available for the grant of Awards under the Plan, subject, however, in
the case of Incentive Stock Options (as hereinafter defined), to any limitation
required under the Code. Shares issued under the Plan may consist in whole or in
part of authorized but unissued shares or treasury shares.

          (b) Per-Participant Limit. Subject to adjustment under Section 8, for
Awards granted after the Common Stock is registered under the Exchange Act, the
maximum number of shares of Common Stock with respect to which Awards may be
granted to any Participant under the Plan shall be 7,876,969 per calendar year.
The per-Participant limit described in this Section 4(b) shall be construed and
applied consistently with Section 162(m) of the Code ("Section 162(m)").

     5.   Stock Options.

          (a) General. The Board may grant options to purchase Common Stock
(each, an "Option") and determine the number of shares of Common Stock to be
covered by each Option, the exercise price of each Option and the conditions and
limitations applicable to the exercise of each Option, including conditions
relating to applicable federal or state securities laws, as it considers
necessary or advisable. An Option which is not intended to be an Incentive Stock
Option (as hereinafter defined) shall be designated a "Nonstatutory Stock
Option".

          (b) Incentive Stock Options. An Option that the Board intends to be an
"incentive stock option" as defined in Section 422 of the Code (an "Incentive
Stock Option") shall only be granted to employees of the Company and shall be
subject to and shall be construed consistently with the requirements of Section
422 of the Code. The Company shall have no liability to a Participant, or any
other party, if an Option (or any part thereof) which is intended to be an
Incentive Stock Option is not an Incentive Stock Option.

          (c) Exercise Price. The Board shall establish the exercise price at
the time each Option is granted and specify it in the applicable option
agreement.

          (d) Duration of Options. Each Option shall be exercisable at such
times and subject to such terms and conditions as the Board may specify in the
applicable option agreement, provided, however, that no Option will be granted
for a term in excess of 10 years.

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          (e) Exercise of Option. Options may be exercised by delivery to the
Company of a written notice of exercise signed by the proper person or by any
other form of notice (including electronic notice) approved by the Board
together with payment in full as specified in Section 5(f) for the number of
shares for which the Option is exercised.

          (f) Payment Upon Exercise. Common Stock purchased upon the exercise of
an Option granted under the Plan shall be paid for as follows:

               (1) in cash or by check, payable to the order of the Company;

               (2) except as the Board may, in its sole discretion, otherwise
provide in an option agreement, by (i) delivery of an irrevocable and
unconditional undertaking by a creditworthy broker to deliver promptly to the
Company sufficient funds to pay the exercise price or (ii) delivery by the
Participant to the Company of a copy of irrevocable and unconditional
instructions to a creditworthy broker to deliver promptly to the Company cash or
a check sufficient to pay the exercise price;

               (3) when the Common Stock is registered under the Exchange Act,
by delivery of shares of Common Stock owned by the Participant valued at their
fair market value as determined by (or in a manner approved by) the Board in
good faith ("Fair Market Value"), provided (i) such method of payment is then
permitted under applicable law and (ii) such Common Stock was owned by the
Participant at least six months prior to such delivery;

               (4) to the extent permitted by the Board, in its sole discretion
by (i) delivery of a promissory note of the Participant to the Company on terms
determined by the Board, or (ii) payment of such other lawful consideration as
the Board may determine; or

               (5) by any combination of the above permitted forms of payment.

     6.   Restricted Stock.

          (a) Grants. The Board may grant Awards entitling recipients to acquire
shares of Common Stock, subject to the right of the Company to repurchase all or
part of such shares at their issue price or other stated or formula price (or to
require forfeiture of such shares if issued at no cost) from the recipient in
the event that conditions specified by the Board in the applicable Award are not
satisfied prior to the end of the applicable restriction period or periods
established by the Board for such Award (each, a "Restricted Stock Award").

          (b) Terms and Conditions. The Board shall determine the terms and
conditions of any such Restricted Stock Award, including the conditions for
repurchase (or forfeiture) and the issue price, if any. Any stock certificates
issued in respect of a Restricted Stock Award shall be registered in the name of
the Participant and, unless otherwise determined by the Board, deposited by the
Participant, together with a stock power endorsed in blank, with the Company (or
its designee). At the expiration of the applicable restriction periods, the
Company (or such designee) shall deliver the certificates no longer subject to
such restrictions to the Participant or if the Participant has died, to the
beneficiary designated, in a manner determined by the Board, by a Participant to
receive amounts due or exercise rights of the Participant in the event of the
Participant's death (the "Designated Beneficiary"). In the absence

                                      -3-

<PAGE>

of an effective designation by a Participant, Designated Beneficiary shall mean
the Participant's estate.

     7.   Other Stock-Based Awards.

     The Board shall have the right to grant other Awards based upon the Common
Stock having such terms and conditions as the Board may determine, including the
grant of shares based upon certain conditions, the grant of securities
convertible into Common Stock and the grant of stock appreciation rights.

     8.   Adjustments for Changes in Common Stock and Certain Other Events.

          (a) Changes in Capitalization. In the event of any stock split,
reverse stock split, stock dividend, recapitalization, combination of shares,
reclassification of shares, spin-off or other similar change in capitalization
or event, or any distribution to holders of Common Stock other than a normal
cash dividend, (i) the number and class of securities available under this Plan,
(ii) the per-Participant limit set forth in Section 4(b), (iii) the number and
class of securities and exercise price per share subject to each outstanding
Option, (iv) the repurchase price per share subject to each outstanding
Restricted Stock Award, and (v) the terms of each other outstanding Award shall
be appropriately adjusted by the Company (or substituted Awards may be made, if
applicable) to the extent the Board shall determine, in good faith, that such an
adjustment (or substitution) is necessary and appropriate. If this Section 8(a)
applies and Section 8(c) also applies to any event, Section 8(c) shall be
applicable to such event, and this Section 8(a) shall not be applicable.

          (b) Liquidation or Dissolution. In the event of a proposed liquidation
or dissolution of the Company, the Board shall upon written notice to the
Participants provide that all then unexercised Options will (i) become
exercisable in full as of a specified time at least 10 business days prior to
the effective date of such liquidation or dissolution and (ii) terminate
effective upon such liquidation or dissolution, except to the extent exercised
before such effective date. The Board may specify the effect of a liquidation or
dissolution on any Restricted Stock Award or other Award granted under the Plan
at the time of the grant of such Award.

          (c) Acquisition Events.

               (1) Definition. An "Acquisition Event" shall mean: (a) any merger
or consolidation of the Company with or into another entity as a result of which
the Common Stock is converted into or exchanged for the right to receive cash,
securities or other property or (b) any exchange of shares of the Company for
cash, securities or other property pursuant to a statutory share exchange
transaction.

          (d) Consequences of an Acquisition Event on Options. Upon the
occurrence of an Acquisition Event, or the execution by the Company of any
agreement with respect to an Acquisition Event, the Board shall provide that all
outstanding Options shall be assumed, or equivalent options shall be
substituted, by the acquiring or succeeding corporation (or an affiliate
thereof). For purposes hereof, an Option shall be considered to be assumed if,
following consummation of the Acquisition Event, the Option confers the right to
purchase, for each share of Common Stock subject to the Option immediately prior
to the consummation of the

                                      -4-

<PAGE>

Acquisition Event, the consideration (whether cash, securities or other
property) received as a result of the Acquisition Event by holders of Common
Stock for each share of Common Stock held immediately prior to the consummation
of the Acquisition Event (and if holders were offered a choice of consideration,
the type of consideration chosen by the holders of a majority of the outstanding
shares of Common Stock); provided, however, that if the consideration received
as a result of the Acquisition Event is not solely common stock of the acquiring
or succeeding corporation (or an affiliate thereof), the Company may, with the
consent of the acquiring or succeeding corporation, provide for the
consideration to be received upon the exercise of Options to consist solely of
common stock of the acquiring or succeeding corporation (or an affiliate
thereof) equivalent in fair market value to the per share consideration received
by holders of outstanding shares of Common Stock as a result of the Acquisition
Event.

          (e) Notwithstanding the foregoing, if the acquiring or succeeding
corporation (or an affiliate thereof) does not agree to assume, or substitute
for, such Options, then the Board shall, upon written notice to the
Participants, provide that all then unexercised Options will become exercisable
in full as of a specified time prior to the Acquisition Event and will terminate
immediately prior to the consummation of such Acquisition Event, except to the
extent exercised by the Participants before the consummation of such Acquisition
Event; provided, however, that in the event of an Acquisition Event under the
terms of which holders of Common Stock will receive upon consummation thereof a
cash payment for each share of Common Stock surrendered pursuant to such
Acquisition Event (the "Acquisition Price"), then the Board may instead provide
that all outstanding Options shall terminate upon consummation of such
Acquisition Event and that each Participant shall receive, in exchange therefor,
a cash payment equal to the amount (if any) by which (A) the Acquisition Price
multiplied by the number of shares of Common Stock subject to such outstanding
Options (whether or not then exercisable), exceeds (B) the aggregate exercise
price of such Options.

          (f) Consequences of an Acquisition Event on Restricted Stock Awards.
Upon the occurrence of an Acquisition Event, the repurchase and other rights of
the Company under each outstanding Restricted Stock Award shall inure to the
benefit of the Company's successor and shall apply to the cash, securities or
other property which the Common Stock was converted into or exchanged for
pursuant to such Acquisition Event in the same manner and to the same extent as
they applied to the Common Stock subject to such Restricted Stock Award.

          (g) Consequences of an Acquisition Event on Other Awards. The Board
shall specify the effect of an Acquisition Event on any other Award granted
under the Plan at the time of the grant of such Award.

     9.   General Provisions Applicable to Awards.

          (a) Transferability of Awards. Except as the Board may otherwise
determine or provide in an Award, Awards shall not be sold, assigned,
transferred, pledged or otherwise encumbered by the person to whom they are
granted, either voluntarily or by operation of law, except by will or the laws
of descent and distribution, and, during the life of the Participant, shall be
exercisable only by the Participant. References to a Participant, to the extent
relevant in the context, shall include references to authorized transferees.

                                      -5-

<PAGE>

          (b) Documentation. Each Award shall be evidenced by a written
instrument in such form as the Board shall determine. Each Award may contain
terms and conditions in addition to those set forth in the Plan.

          (c) Board Discretion. Except as otherwise provided by the Plan, each
Award may be made alone or in addition or in relation to any other Award. The
terms of each Award need not be identical, and the Board need not treat
Participants uniformly.

          (d) Termination of Status. The Board shall determine the effect on an
Award of the disability, death, retirement, authorized leave of absence or other
change in the employment or other status of a Participant and the extent to
which, and the period during which, the Participant, the Participant's legal
representative, conservator, guardian or Designated Beneficiary may exercise
rights under the Award.

          (e) Withholding. Each Participant shall pay to the Company, or make
provision satisfactory to the Board for payment of, any taxes required by law to
be withheld in connection with Awards to such Participant no later than the date
of the event creating the tax liability. Except as the Board may otherwise
provide in an Award, when the Common Stock is registered under the Exchange Act,
Participants may, to the extent then permitted under applicable law, satisfy
such tax obligations in whole or in part by delivery of shares of Common Stock,
including shares retained from the Award creating the tax obligation, valued at
their Fair Market Value. The Company may, to the extent permitted by law, deduct
any such tax obligations from any payment of any kind otherwise due to a
Participant.

          (f) Amendment of Award. The Board may amend, modify or terminate any
outstanding Award, including but not limited to, substituting therefor another
Award of the same or a different type, changing the date of exercise or
realization, and converting an Incentive Stock Option to a Nonstatutory Stock
Option, provided that the Participant's consent to such action shall be required
unless the Board determines in its sole discretion that the action, taking into
account any related action, would not materially and adversely affect the
Participant. Any such determination of the Board, made in good faith, shall be
final and conclusive.

          (g) Conditions on Delivery of Stock. The Company will not be obligated
to deliver any shares of Common Stock pursuant to the Plan or to remove
restrictions from shares previously delivered under the Plan until (i) all
conditions of the Award have been met or removed to the satisfaction of the
Company, (ii) in the opinion of the Company's counsel, all other legal matters
in connection with the issuance and delivery of such shares have been satisfied,
including any applicable securities laws and any applicable stock exchange or
stock market rules and regulations, and (iii) the Participant has executed and
delivered to the Company such representations or agreements as the Company may
consider appropriate to satisfy the requirements of any applicable laws, rules
or regulations.

          (h) Acceleration. The Board may at any time provide that any Options
shall become immediately exercisable in full or in part, that any Restricted
Stock Awards shall be free of restrictions in full or in part or that any other
Awards may become exercisable in full or in part or free of some or all
restrictions or conditions, or otherwise realizable in full or in part, as the
case may be.

                                      -6-

<PAGE>

     10.  Miscellaneous.

          (a) No Right To Employment or Other Status. No person shall have any
claim or right to be granted an Award, and the grant of an Award shall not be
construed as giving a Participant the right to continued employment or any other
relationship with the Company. The Company expressly reserves the right at any
time to dismiss or otherwise terminate its relationship with a Participant free
from any liability or claim under the Plan, except as expressly provided in the
applicable Award.

          (b) No Rights As Stockholder. Subject to the provisions of the
applicable Award, no Participant or Designated Beneficiary shall have any rights
as a stockholder with respect to any shares of Common Stock to be distributed
with respect to an Award until becoming the record holder of such shares.
Notwithstanding the foregoing, in the event the Company effects a split of the
Common Stock by means of a stock dividend and the exercise price of and the
number of shares subject to such Option are adjusted as of the date of the
distribution of the dividend (rather than as of the record date for such
dividend), then an optionee who exercises an Option between the record date and
the distribution date for such stock dividend shall be entitled to receive, on
the distribution date, the stock dividend with respect to the shares of Common
Stock acquired upon such Option exercise, notwithstanding the fact that such
shares were not outstanding as of the close of business on the record date for
such stock dividend.

          (c) Effective Date and Term of Plan. The Plan shall become effective
on the date on which it is adopted by the Board. No Awards shall be granted
under the Plan after the completion of ten years from the earlier of (i) the
date on which the Plan was adopted by the Board or (ii) the date the Plan was
approved by the Company's stockholders, but Awards previously granted may extend
beyond that date.

          (d) Amendment of Plan. The Board may amend, suspend or terminate the
Plan or any portion thereof at any time.

          (e) Governing Law. The provisions of the Plan and all Awards made
hereunder shall be governed by and interpreted in accordance with the laws of
the State of Delaware, without regard to any applicable conflicts of law.

                                      -7-

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