Document:

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                                                                 EXHIBIT 10.30.1

                                                                  August 1, 2001

LEAP WIRELESS INTERNATIONAL, INC.
10307 Pacific Center Court
San Diego, California 92121
Attention:  General Counsel

                  Re:      Loan Agreement dated as of January 22, 2001 (as the
                           same may from time to time be amended, modified,
                           supplemented or restated, the "Loan Agreement"), by
                           and among LEAP WIRELESS INTERNATIONAL, INC.
                           ("Borrower"), QUALCOMM INCORPORATED ("QUALCOMM") and
                           the other lenders from time to time party thereto,
                           and CITIBANK, N.A., as administrative agent for the
                           Lenders (the "Administrative Agent") and as
                           collateral agent for the Lenders.

Ladies and Gentlemen:

                  This Letter Agreement is a First Amendment to the Loan
Agreement (this "First Amendment"). The terms defined therein are used herein as
therein defined. The Closing Date occurred on March 9, 2001, and a Cash Loan is
currently outstanding in an amount equal to the Commitment Fee plus interest
accrued thereon.

                  Pursuant to Section 2.4(e) of the Loan Agreement, QUALCOMM
hereby requests that the Borrower return, assign and transfer the ADV that has
been assigned to the Borrower by QUALCOMM pursuant to the ADV Assignment and
Acceptance, dated as of March 9, 2001, between QUALCOMM and the Borrower and
that Borrower duly execute and deliver the ADV Assignment and Acceptance, dated
as of the date of this First Amendment (the "ADV Return Instrument").

                  In accordance with Section 2.4(e) of the Loan Agreement and
subject to the due execution and delivery by LEAP of the ADV Return Instrument
and confirmation by the FCC of the assignment of the ADV to QUALCOMM, QUALCOMM
hereby confirms its commitment to make Cash Loans, upon the terms and subject to
the conditions of the Loan Agreement, in an aggregate amount not to exceed the
amount of the ADV transferred to QUALCOMM pursuant to the ADV Return Instrument
and on such terms as if no ADV Loan had ever been made under the Loan Agreement
(including with respect to Borrower's compliance with Sections 7.5 and 10.3(c)
of the Loan Agreement) but without limiting the facts that the Closing Date
occurred on March 9, 2001 and that the Commitment Fee has been paid and a Cash
Loan and Promissory Note remain outstanding and payable with respect thereto
pursuant to the terms of the Loan Agreement;

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provided that QUALCOMM may, at any time and from time to time, but subject to
Applicable Law and the consent of the FCC, if and to the extent required by
Applicable Law, in exchange for or satisfaction of such commitment or any
portion thereof, transfer to the Borrower all or a portion of the ADV in the
same amount as such commitment or portion thereof (in which event an ADV Loan
shall be deemed to have been made in such amount under the Loan Agreement) so
long as Borrower has requested a Loan and can use the ADV for its intended
purposes.

                  Upon the effectiveness of the ADV Return Instrument, QUALCOMM
may (notwithstanding anything in the Loan Agreement to the contrary) freely use,
sell, assign, convey, encumber or otherwise transfer or dispose of all or any
portion of the ADV.

                  The Borrower and QUALCOMM each shall take, or cause to be
taken, all actions, and shall do or cause to be done, all things reasonably
necessary, proper and advisable (and requested by the other party) in order to
facilitate and consummate the transactions contemplated hereby and by the ADV
Return Instrument. Without limiting the foregoing, QUALCOMM agrees to notify the
FCC of the assignment to QUALCOMM by the Borrower of the ADV within one (1)
Business Day of the execution and delivery by the parties of this First
Amendment and of the ADV Return Instrument and to seek the confirmation by the
FCC of the assignment to QUALCOMM by LEAP of the Assigned Interest in a
commercially reasonably diligent manner.

                  This First Amendment shall be governed by and construed in
accordance with the laws of the State of New York.

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                  Your signature below confirms your acknowledgement of and
agreement to the foregoing:

                                       QUALCOMM INCORPORATED

                                       By: /s/ PAUL FISKNESS
                                           -------------------------------------
                                       Name:  Paul Fiskness
                                       Title:  Senior Vice President

                                       ACCEPTED AND AGREED AS OF THE DATE
                                       SET FORTH ABOVE:

                                       LEAP WIRELESS INTERNATIONAL, INC.

                                       By: /s/ TOM WILLARDSON
                                           -------------------------------------
                                       Name:  Tom Willardson
                                       Title:  Senior Vice President, Finance

ACKNOWLEDGED:

CITIBANK, N.A., as Administrative Agent

By: /s/ JANET WALLACE
    -------------------------
Name: Janet Wallace
Title:  Attorney-in-Fact

                                       3<PAGE>   1

                                                                 EXHIBIT 10.30.2

                          ADV ASSIGNMENT AND ACCEPTANCE

        THIS ADV ASSIGNMENT AND ACCEPTANCE (this "ADV Assignment and
Acceptance") dated as of August 1, 2001, between LEAP WIRELESS INTERNATIONAL,
INC. ("LEAP") and QUALCOMM INCORPORATED ("QUALCOMM").

        A. QUALCOMM and LEAP executed and delivered the ADV Assignment and
Acceptance (the "Original ADV Assignment") on March 9, 2001, in accordance with
and with reference to Section 2.4(a) of that certain Loan Agreement dated as of
January 22, 2001 (as from time to time amended, modified, supplemented or
restated, the "Loan Agreement"), by and among LEAP (as Borrower), QUALCOMM (as a
Lender), and the other lenders from time to time party thereto (the other
lenders and QUALCOMM, collectively, the "Lenders"), and Citibank, N.A. as
administrative agent for the Lenders (the "Administrative Agent") and as
collateral agent for the Lenders. All capitalized terms used, but not defined
herein, shall have the respective meanings assigned to such terms in the Loan
Agreement.

        B. Pursuant to the Original ADV Assignment, QUALCOMM assigned the ADV in
the amount of $125,273,878 to LEAP on March 9, 2001.

        C. This ADV Assignment and Acceptance is being executed and delivered in
accordance with and with reference to Section 2.4(e) of the Loan Agreement
pursuant to which LEAP is obligated to return the ADV to QUALCOMM at the request
of QUALCOMM in exchange for QUALCOMM'S commitment to make Cash Loans in the
amount of the ADV, which commitment is confirmed in that certain letter
agreement between LEAP and QUALCOMM dated as of the date of this ADV Assignment
and Acceptance (the "Letter Agreement").

        D. On the terms and subject to the conditions set forth in the Loan
Agreement and herein, LEAP desires to transfer and assign to QUALCOMM, and
QUALCOMM desires to accept such transfer and assignment of, and assume from
LEAP, an interest (the "Assigned Interest") in LEAP's rights and obligations in,
to and under the ADV in the amount of $125,273,878.

        NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which consideration are hereby acknowledged, LEAP and QUALCOMM
hereby agree as follows:

        1. LEAP hereby transfers and assigns to QUALCOMM WITHOUT RECOURSE, but
subject to LEAP's representations and warranties set forth in Section 3 of this
ADV Assignment and Acceptance, and QUALCOMM hereby accepts such transfer and
assignment and assumes from LEAP, the Assigned Interest; provided that the
effectiveness of the foregoing

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transfer, assignment, acceptance and assumption is conditioned upon confirmation
by the FCC of the assignment to QUALCOMM by LEAP of the Assigned Interest.

        2. After the execution and delivery of this ADV Assignment and
Acceptance by QUALCOMM, LEAP will, upon request of QUALCOMM, promptly provide to
QUALCOMM copies of all documents related to the ADV, to the extent QUALCOMM
deems such documents to be necessary for using the Assigned Interest and to the
extent that QUALCOMM does not have access to such documents.

        3. LEAP represents and warrants to QUALCOMM, as of the execution of this
ADV Assignment and Acceptance and immediately prior to the transfer and
assignment of the ADV to QUALCOMM pursuant to Section 1 above, that (a) it has
good title to the ADV, free and clear of all Liens, other than restrictions
imposed on the ownership and use of the ADV by the FCC pursuant to the Order and
the FCC Letters and (b) it has not used any portion of the ADV, nor sold,
assigned, conveyed, encumbered or otherwise transferred or disposed of the ADV
or any interest therein, in whole or in part, nor has it entered into any
agreement, understanding or arrangement with respect to the foregoing, other
than under the Loan Agreement, this ADV Assignment and Acceptance and the Letter
Agreement.

        4. Except as provided in Section 3 of this ADV Assignment and
Acceptance, LEAP makes no representations or warranty and assumes no
responsibility with respect to any statements, warranties or representations
made in connection with the ADV or as to the execution, legality, validity,
enforceability, genuineness, sufficiency or value of the ADV.

        5. LEAP AND QUALCOMM agree and acknowledge hereby that (a) following the
execution of this ADV Assignment and Acceptance, it will be delivered to the
Administrative Agent for recording and (b) upon the confirmation by the FCC of
the assignment to QUALCOMM by LEAP of the Assigned Interest, QUALCOMM shall
return to LEAP the Promissory Note executed by LEAP evidencing the ADV Loan made
by QUALCOMM to LEAP as of March 9, 2001.

        This ADV Assignment and Acceptance shall be governed by, and construed
in accordance with, the laws of the State of New York.

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        In Witness Whereof, each of the parties hereto has caused this ADV
Assignment and Acceptance to be executed and delivered by a duly authorized
person on the date first set forth above.

QUALCOMM Incorporated

By: /s/ PAUL FISKNESS
    --------------------------------
Printed Name: Paul Fiskness
             -----------------------
Title: Senior Vice President
       -----------------------------

LEAP WIRELESS INTERNATIONAL, INC.

By: /s/ TOM WILLARDSON
    ---------------------------------
Printed Name: Tom Willardson
             ------------------------
Title: Senior Vice President, Finance
      -------------------------------

Recorded this   1    day of
              ------
    August                , 2001
--------------------------
CITIBANK, N.A.,
as the Administrative Agent

By:  /s/ JANET WALLACE
   ----------------------------------
Printed Name:  Janet Wallace
             ------------------------
Title:  Attorney-in-Fact
       ------------------------------

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