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, 2010

OR

Commission File Number 001-33963

Iridium Communications Inc.

(Exact name of registrant as specified in its charter)

703-287-7400

(Registrant’s telephone number, including area code)

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, and (2) has been subject to such filing requirements for the past 90 days.    Yes   x    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 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” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

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

The number of shares of the registrant’s common stock, par value $0.001 per share, outstanding as of November 5, 2010 was 70,251,001.

EXPLANATORY NOTE

This Amendment No. 1 (“Amendment No. 1”) amends the Quarterly Report on Form 10-Q of Iridium Communications Inc. (the “Company”) for the quarter ended September 30, 2010, originally filed with the Securities and Exchange Commission (the “SEC”) on November 9, 2010 (the “Quarterly Report”). The Company is filing this Amendment No. 1 solely to update Exhibits 10.1, 10.3 and 10.5 to the Quarterly Report (the “Exhibits”). The Company sought confidential treatment for portions of the Exhibits and, following correspondence with the SEC, has restored certain portions of the Exhibits that were previously redacted.

Except for the foregoing, this Amendment No. 1 does not amend the Quarterly Report in any way and does not modify or update any disclosures contained in the Quarterly Report, which continues to speak as of the original date of the Quarterly Report. Accordingly, this Amendment No. 1 should be read in conjunction with the Quarterly Report and the Company’s other filings made with the SEC subsequent to the Quarterly Report.

In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Amendment No. 1 includes updated certifications from the Registrant’s Chief Executive Officer and Chief Financial Officer.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Amendment No. 1 to Quarterly Report on Form 10-Q to be signed on its behalf by the undersigned thereunto duly authorized.

Date: January 14, 2011

1

EXHIBIT INDEX

1