UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934
(Amendment No. 4)*

          Leap Wireless International, Inc.

(Name of Issuer)

  Common Stock, Par Value $.0001 Per Share  

(Title of Class of Securities)

     521863308     

(CUSIP Number)

Doron Lipshitz, Esq.
O’Melveny & Myers LLP
7 Times Square
New York, New York 10036
          (212) 326-2061          
(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

 December 21, 2007 
(Date of Event which Requires Filing
of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box o.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Continued on following pages

CUSIP No.		521863308

CUSIP No.		521863308

CUSIP No.		521863308

CUSIP No.		521863308

     This Statement on Schedule 13D (this “Statement”) further amends and supplements, as Amendment No. 4, the Schedule 13D filed on August 26, 2004 (the “Original Schedule 13D”), which was amended and restated on December 19, 2007 by Amendment No. 1 to the Original Schedule 13D (“Amendment No. 1”), on December 20, 2007 by Amendment No. 2 to the Original 13D (“Amendment No. 2”) and on December 21, 2007 by Amendment No. 3 to the Original Schedule 13D ((“Amendment No. 3”) and, together with the Original Schedule 13D, Amendment No. 1 and Amendment No. 2, the “Schedule 13D”) and relates to the shares of common stock, par value $0.0001 per share (the “Common Stock”), of Leap Wireless International, Inc. (the “Issuer”).

     This Statement is being filed by the Reporting Persons to report the acquisition of additional shares of Common Stock.

Item 3. Source and Amount of Funds or Other Consideration

     Item 3 is hereby amended to add the following:

     The source of funds for the purchase reported in this Statement was the working capital of Master Account, Capital Partners (100) and Institutional Partners III.

Item 4. Purpose of Transaction

     Item 4 is hereby amended as follows:

     The fourth paragraph under the title “Item 4. Purpose of Transaction” is hereby amended to delete the phrase “(including in the coming days)” and to add the following at the end of such paragraph: “although the Reporting Persons do not have a current intention to acquire or dispose of additional securities of the Issuer through open market transactions in the coming days, which current intention is subject to change at any time.”

Item 5. Interest in Securities of the Issuer

     Item 5 is hereby amended and restated in its entirety as follows:

     The percentages set forth in this Statement are calculated based on information contained in the Issuer’s Form 10-Q for the quarterly period ended September 30, 2007, which disclosed that there were 68,207,914 shares of Common Stock outstanding as of December 7, 2007.

(a) (i) Master Account may be deemed the beneficial owner of 353,420 shares of Common Stock held for its own account (approximately 0.5% of the total number of shares of Common Stock outstanding, calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act).

          (ii) Capital Partners (100) may be deemed the beneficial owner of 42,514 shares of Common Stock held for its own account (approximately 0.06% of the total number of shares of Common Stock outstanding, calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act).

          (iii) Advisors may be deemed the beneficial owner of 395,934 shares of Common Stock (approximately 0.6% of the total number of shares of Common Stock outstanding, calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act). This number consists of (A) 353,420 shares of Common Stock held for the account of Master Account and (B) 42,514 shares of Common Stock held for the account of Capital Partners (100).

          (iv) Institutional Partners II LP may be deemed the beneficial owner of 3,340,378 shares of Common Stock held for its own account (approximately 4.9% of the total number of shares of Common Stock outstanding, calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act).

          (v) Institutional Partners IIA may be deemed the beneficial owner of 8,415,428 shares of Common Stock held for its own account (approximately 12.3% of the total number of shares of Common Stock outstanding calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act).

          (vi) Institutional Advisors II may be deemed the beneficial owner of 11,755,806 shares of Common Stock (approximately 17.2% of the total number of shares of Common Stock outstanding calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act). This number consists of (A) 3,340,378 shares of Common Stock held for the account of Institutional Partners II and (B) 8,415,428 shares of Common Stock held for the account of Institutional Partners IIA.

          (vii) Institutional Partners III may be deemed the beneficial owner of 3,386,129 shares of Common Stock held for its own account (approximately 4.96% of the total number of shares of Common Stock outstanding calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act).

          (viii) Institutional Advisors III may be deemed the beneficial owner of 3,386,129 shares of Common Stock (approximately 4.96% of the total number of shares of Common Stock outstanding calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act). This number consists of 3,386,129 shares of Common Stock held for the account of Institutional Partners III.

          (ix) Fund Management may be deemed the beneficial owner of 15,537,869 shares of Common Stock (approximately 22.8% of the total number of shares of Common Stock outstanding, calculated in accordance with Rule 13d-3(d)(1)(i) under the Exchange Act). This number consists of all of the shares of Common Stock otherwise described in this Item 5(a) by virtue of Fund Management’s investment management agreement with Master Account, Capital Partners (100), Institutional Partners II, Institutional Partners IIA and Institutional Partners III.

          (x) Dr. Rachesky may be deemed the beneficial owner of 15,581,543 shares of Common Stock (approximately 22.8% of the total number of shares of Common Stock outstanding, calculated in accordance

with Rule 13d-3(d)(1)(i) under the Exchange Act). This number consists of (A) all of the shares of Common Stock otherwise described in this Item 5(a) by virtue of Dr. Rachesky’s position as the managing member of each of Fund Management, Advisors, Institutional Advisors II and Institutional Advisors III, (B) 3,474 shares of restricted stock, and (C) 40,200 shares of Common Stock that can be obtained upon the exercise of certain non-qualified stock options.

     (b) (i) Master Account may be deemed to have (x) the sole power to direct the disposition of 353,420 shares of Common Stock which may be deemed to be beneficially owned by Master Account as described above, and (y) the sole power to direct the voting of 353,420 shares of Common Stock which may be deemed to be beneficially owned by Master Account as described above.

          (ii) Capital Partners (100) may be deemed to have (x) the sole power to direct the disposition of 42,514 shares of Common Stock which may be deemed to be beneficially owned by Capital Partners (100) as described above, and (y) the sole power to direct the voting of 42,514 shares of Common Stock which may be deemed to be beneficially owned by Capital Partners (100) as described above.

          (iii) Advisors may be deemed to have (x) the sole power to direct the disposition of 395,934 shares of Common Stock which may be deemed to be beneficially owned by Advisors as described above, and (y) the sole power to direct the voting of 395,934 shares of Common Stock which may be deemed to be beneficially owned by Advisors as described above.

          (iv) Institutional Partners II may be deemed to have (x) the sole power to direct the disposition of 3,340,378 shares of Common Stock which may be deemed to be beneficially owned by Institutional Partners II as described above, and (y) the sole power to direct the voting of 3,340,378 shares of Common Stock which may be deemed to be beneficially owned by Institutional Partners II as described above.

          (v) Institutional Partners IIA may be deemed to have (x) the sole power to direct the disposition of 8,415,428 shares of Common Stock which may be deemed to be beneficially owned by Institutional Partners IIA as described above, and (y) the sole power to direct the voting of 8,415,428 shares of Common Stock which may be deemed to be beneficially owned by Institutional Partners IIA as described above.

          (vi) Institutional Advisors II may be deemed to have (x) the sole power to direct the disposition of 11,755,806 shares of Common Stock which may be deemed to be beneficially owned by Institutional Advisors II as described above, and (y) the sole power to direct the voting of 11,755,806 shares of Common Stock which may be deemed to be beneficially owned by Institutional Advisors II as described above.

          (vii) Institutional Partners III may be deemed to have (x) the sole power to direct the disposition of 3,386,129 shares of Common Stock which may be deemed to be beneficially owned by Institutional Partners III as described above, and (y) the sole power to direct the voting of 3,386,129 shares of Common Stock which may be deemed to be beneficially owned by Institutional Partners III as described above.

          (viii) Institutional Advisors III may be deemed to have (x) the sole power to direct the disposition of 3,386,129 shares of Common Stock which may be deemed to be beneficially owned by

Institutional Advisors III as described above, and (y) the sole power to direct the voting of 3,386,129 shares of Common Stock which may be deemed to be beneficially owned by Institutional Advisors III as described above.

          (ix) Fund Management may be deemed to have (x) the sole power to direct the disposition of the 15,537,869 shares of Common Stock which may be deemed to be beneficially owned by Fund Management as described above, and (y) the sole power to direct the voting of 15,537,869 shares of Common Stock which may be deemed to be beneficially owned by Fund Management as described above.

          (x) Dr. Rachesky may be deemed to have (x) the sole power to direct the disposition of the 15,581,543 shares of Common Stock which may be deemed to be beneficially owned by Dr. Rachesky as described above, (y) the sole power to direct the voting of 15,581,543 shares of Common Stock which may be deemed to be beneficially owned by Dr. Rachesky as described above.

     (c) Except as otherwise disclosed herein, there have been no transactions with respect to the shares of Common Stock in the last 60 days by any of the Reporting Persons.

     (d) (i) The partners of Master Account, including Advisors, have the right to participate in the receipt of dividends from, or proceeds from the sale of, the securities held for the account of Master Account in accordance with their partnership interests in Master Account.

          (ii) The partners of Capital Partners (100), including Advisors, have the right to participate in the receipt of dividends from, or proceeds from the sale of, the securities held for the account of Capital Partners (100) in accordance with their partnership interests in Capital Partners (100).

          (iii) The partners of Institutional Partners II, including Institutional Advisors II, have the right to participate in the receipt of dividends from, or proceeds from the sale of, the securities held for the account of Institutional Partners II in accordance with their partnership interests in Institutional Partners II.

          (iv) The partners of Institutional Partners IIA, including Institutional Advisors II, have the right to participate in the receipt of dividends from, or proceeds from the sale of, the securities held for the account of Institutional Partners IIA in accordance with their partnership interests in Institutional Partners IIA.

          (v) The partners of Institutional Partners III, including Institutional Advisors III, have the right to participate in the receipt of dividends from, or proceeds from the sale of, the securities held for the account of Institutional Partners III in accordance with their partnership interests in Institutional Partners III.

     (e) Not applicable.

SIGNATURES

     After reasonable inquiry and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this Statement is true, complete and correct.

Date: December 21, 2007		MHR INSTITUTIONAL PARTNERS IIA LP
		By:		MHR Institutional Advisors II LLC, its General Partner
		By:		/s/ Mark Rachesky
		Name: Mark Rachesky, M.D.
		Title: Managing Member

		MHR INSTITUTIONAL ADVISORS II LLC
		By:		/s/ Mark Rachesky
		Name: Mark Rachesky, M.D.
		Title: Managing Member
		MHR FUND MANAGEMENT LLC
		By:		/s/ Mark Rachesky
		Name: Mark Rachesky, M.D.
		Title: Managing Member
		MARK H. RACHESKY, M.D.
		By:		/s/ Mark Rachesky