UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Amendment No. 1)

(Mark One)

For the quarterly period ended September 30, 2009

or 

For the transition period from              to             

Commission File Number: 001-33735

Virgin Mobile USA, Inc.

(Exact name of registrant as specified in its charter)

(908) 607-4000

(Registrant’s telephone number, including area code)

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    x  Yes    ¨  No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    ¨  Yes    ¨  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” “non-accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    ¨  Yes    x  No

EXPLANATORY NOTE

Virgin Mobile USA, Inc. (the Company) is filing this Amendment No. 1 on Form 10-Q/A (the Amendment) to its Quarterly Report on Form 10-Q for the period ended September 30, 2009 (the Original Filing), which was originally filed with the Securities and Exchange Commission (the Commission) on November 6, 2009, solely for the purpose of filing Exhibit 10.4 as listed in the Exhibit Index of the Original Amendment. This Amendment does not reflect events occurring after the date of the Original Filing or modify or update any of the other disclosure contained therein in any way.

See Exhibit Index.

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 thereunto duly authorized.

EXHIBIT INDEX