Document:

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                                                                 EXHIBIT 10.18.4

                                   AMENDMENT AND WAIVER dated as of
                    October 27, 2000, to the Parent Agreement dated as of
                    November 24, 1999 (as amended, the "Parent Agreement"),
                    among Leap Wireless International, Inc. and Lucent
                    Technologies Inc., as administrative agent (in such
                    capacity, the "Administrative Agent") for the lenders from
                    time to time party to the Credit Agreement dated as of
                    September 20, 1999, as amended and restated as of October
                    20, 2000 (the "Credit Agreement"), among Cricket
                    Communications Holdings, Inc., Cricket Communications, Inc.,
                    such lenders and the Administrative Agent. Capitalized terms
                    used herein and not defined herein shall have the meanings
                    assigned to such terms in the Credit Agreement

     WHEREAS the Parent and the Borrower have requested that certain provisions
of the Parent Agreement be amended and waived in certain respects, and the
Lenders and the Administrative Agent are willing to amend and waive such
provisions on the terms and subject to the conditions set forth herein.

     NOW, THEREFORE, for and in consideration of the mutual agreements contained
in this Amendment and Waiver and other good and valuable consideration, the
sufficiency and receipt of which are hereby acknowledged, the parties hereto
hereby agree as follows:

     SECTION 1.  Amendment.  Section 8(b) of the Parent Agreement is hereby
amended and restated in its entirety as follows:

     (b)      The Parent and its subsidiaries (other than the Borrower and the
     Subsidiary Loan Parties) will cause all assets owned by the Parent and its
     subsidiaries (i) that are used predominantly in the business of the
     Borrower and the Subsidiary Loan Parties or (ii) for which the parent or
     its subsidiaries have (A) ordered equipment for deployment or (B) commenced
     site acquisition, in each case, for the market in which such assets are to
     be located, to be owned by the Borrower and the Subsidiary Loan Parties.

     SECTION 2.  Waivers.  (a)  The provisions of Section 8(b) of the Parent
Agreement are hereby waived with respect to FCC telecommunications licenses
owned by Parent or any of its subsidiaries for each of the Salem, Oregon,
Spokane, Washington, and Boise, Idaho, markets (each, an "Existing Licensed
Market") from the date hereof until the earlier of (i) sixty (60) days from the
date hereof and (ii) the date that ownership of the FCC License with respect
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to such Existing Licensed Market has been transferred from the Parent or any
Affiliate of the Parent to the License Subsidiary for such Existing Licensed
Market; provided that, as a condition to the continued effectiveness of such
waiver, the Parent shall take all reasonable steps to effect such transfer
promptly after the date hereof.

     (b)      The provisions of Section 8(b) of the Parent Agreement are hereby
waived with respect to FCC telecommunications licenses owned by Parent or any of
its subsidiaries for each of the Omaha, Nebraska, Macon, Georgia, Columbus,
Georgia, Greeley, Colorado, Fort Collins, Colorado, and Eugene, Oregon, markets
(each, a "Future Licensed Market") during the period from the date of
acquisition by the Parent or an Affiliate of the Parent of the FCC License with
respect to such Future Licensed Market until the earlier of (i) sixty (60) days
from the date of such acquisition and (ii) the date that ownership of the FCC
License with respect to such Future Licensed Market has been transferred from
the Parent or any Affiliate of the Parent to the License Subsidiary for such
Future Licensed Market; provided that, as a condition to the continued
effectiveness of such waiver, the Parent shall take all reasonable steps to
effect such transfer promptly after the date of acquisition of such FCC License
by the Parent or an Affiliate of the Parent.

     SECTION 3.  Applicable Law.  THIS AMENDMENT AND WAIVER SHALL BE CONSTRUED
IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

     SECTION 4.  Parent Agreement.  Except as expressly amended and waived
hereby, the Parent Agreement shall continue in full force and effect in
accordance with the provisions thereof.

     SECTION 5.  Expenses.  The Parent agrees to reimburse the Administrative
Agent for its out-of-pocket expenses in connection with this Amendment and
Waiver, including the fees, charges and disbursements of Cravath, Swaine &
Moore, counsel for the Administrative Agent.

     SECTION 6.  Counterparts.  This Amendment and Waiver may be executed in two
or more counterparts, each of which shall constitute an original but all of
which when taken together shall constitute but one contract.  Delivery of an
executed counterpart of a signature page by facsimile transmission shall be
effective as delivery of a manually executed counterpart of this Amendment and
Waiver.
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     IN WITNESS WHEREOF, the parties hereto have caused this Amendment and
Waiver to be duly executed by their respective authorized officers as of the day
and year first written above.

                                 LEAP WIRELESS INTERNATIONAL, INC.

                                 By: /s/ ROBERT J. IRVING, JR.
                                    -----------------------------
                                   Name: Robert J. Irving, Jr.
                                   Title: Assistant Secretary

                                 CRICKET COMMUNICATIONS HOLDINGS,
                                 INC.

                                 By: /s/ ROBERT J. IRVING, JR.
                                    -----------------------------
                                   Name: Robert J. Irving, Jr.
                                   Title: Assistant Secretary

                                 CRICKET COMMUNICATIONS, INC.

                                 By: /s/ ROBERT J. IRVING, JR.
                                    -----------------------------
                                   Name: Robert J. Irving, Jr.
                                   Title: Assistant Secretary

                                 LUCENT TECHNOLOGIES, INC.,
                                 individually and as
                                 Administrative Agent

                                 By: /s/ SUSAN M. COLROSS
                                    -----------------------------
                                   Name: Susan M. Colross
                                   Title:

                                 SOCIETE GENERALE

                                 By: /s/ ROBERT G. ROBIN
                                    -----------------------------
                                   Name: Robert G. Robin
                                   Title: Vice President<PAGE>
                                                                 EXHIBIT 10.18.5

     THIRD AMENDMENT (this "Amendment"), dated as of March 18, 2002, to that
certain Parent Agreement, dated as of September 17, 1999 (the "Parent
Agreement"), between LEAP WIRELESS INTERNATIONAL, INC., a Delaware corporation
(the "Parent") and LUCENT TECHNOLOGIES, INC., as Administrative Agent (in such
capacity, the "Administrative Agent") for the Lenders (as defined in the Credit
Agreement referred to below).

     WHEREAS, Cricket Communications Holdings, Inc., Cricket Communications,
Inc. (the "Borrower"), the Lenders party thereto and the Administrative Agent
have entered into that certain Credit Agreement dated as of September 20, 1999,
as Amended and Restated as of October 20, 2000 (as amended, supplemented or
otherwise modified from time to time, the "Credit Agreement"). Capitalized terms
used herein and not defined herein shall have the meanings assigned to such
terms in the Credit Agreement.

     WHEREAS, Borrower, the Required Lenders and the Administrative Agent have
agreed to amend certain provisions of the Credit Agreement on the terms and
subject to the conditions set forth in that Second Amendment to the Credit
Agreement dated as of March 18, 2002 (the "Second Credit Agreement Amendment").

     WHEREAS, in connection with the Second Credit Agreement Amendment, Parent
and the Administrative Agent have agreed to amend certain provisions of the
Parent Agreement on the terms and subject to the conditions set forth herein.

     NOW, THEREFORE, for and in consideration of the mutual agreements contained
in this Amendment and other good and valuable consideration, the sufficiency and
receipt of which are hereby acknowledged, the parties hereto hereby agree as
follows:

     Section 1.     Amendment.  Section 8 of the Parent Agreement is hereby
amended by inserting the following paragraph at the end thereof:

     (c)  The Parent will (i) perform or cause to be performed each action
required or contemplated to be performed by Parent under Sections 5.18, 5.19 and
5.20 of the Credit Agreement as and when contemplated thereunder and (ii) invest
as equity in Holdings, and cause Holdings to invest as equity in Borrower, the
cash proceeds of any dividend paid by a License Subsidiary pursuant to clause
(i) of Section 6.06 of the Credit Agreement.

     Section 2.         Conditions to Effectiveness.  This Amendment shall
become effective upon (a) execution by the parties hereto and (b)  the
effectiveness of the Second Credit Agreement Amendment.

     Section 3.          Applicable Law.  THIS AMENDMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH AND GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

     Section 4.         Parent Agreement.  Except as expressly amended hereby,
the Parent Agreement shall continue in full force and effect in accordance with
the provisions thereof.  Any reference in the Parent Agreement, the Credit
Agreement or any documents or instruments required thereunder or any annexes or
schedules thereto, to the Parent Agreement shall be deemed to refer to the
Parent Agreement as amended by this Amendment.
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     Section 5.         Counterparts.  This Amendment may be executed in two or
more counterparts, each of which shall constitute an original but all of which
when taken together shall constitute but one contract.  Delivery of an executed
counterpart of a signature page by facsimile transmission shall be effective as
delivery of a manually executed counterpart of this Amendment.

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed by their respective authorized officers as of the day and year
first written above.

LEAP WIRELESS INTERNATIONAL, INC.

By:     /s/ S. G. SWENSON
        -----------------
Name:   S. G. Swenson
        -------------
Title:  President and COO
        -----------------

LUCENT TECHNOLOGIES INC., as
Administrative Agent

By:     /s/ FRANK A. DELCORE
        --------------------
Name:   Frank A. DelCore
        ----------------
Title:  Director
        --------

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