UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

(Amendment No. 1)

(Mark One)

For the fiscal year ended December 31, 2010

OR

For the transition period from             to             

Commission File Number 001-33963

Iridium Communications Inc.

(Exact name of registrant as specified in its charter)

1750 Tysons Boulevard, Suite 1400, McLean, Virginia 22102

(Address of principal executive offices, including zip code)

703-287-7400

(Registrant’s telephone number, including area code)

Securities Registered Pursuant to Section 12(b) of the Act:

Securities Registered Pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ¨    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

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.    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 (§ 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 if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

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 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 aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold as of June 30, 2010 was approximately $343.9 million.

The number of shares of the registrant’s common stock, par value $0.001 per share, outstanding as of March 4, 2011 was 70,253,601.

DOCUMENTS INCORPORATED BY REFERENCE

None.

EXPLANATORY NOTE

This Amendment No. 1 (“Amendment No. 1”) amends the Annual Report on Form 10-K of Iridium Communications Inc. (the “Company”) for the fiscal year ended December 31, 2010, originally filed with the Securities and Exchange Commission (the “SEC”) on March 7, 2011 (the “Annual Report”). The Company is filing this Amendment No. 1 solely to update Exhibit 10.1 to the Annual Report (the “Exhibit”). The Company sought confidential treatment for portions of the Exhibit and, following correspondence with the SEC, has restored certain portions of the Exhibit that were previously redacted.

Except for the foregoing, this Amendment No. 1 does not amend the Annual Report in any way and does not modify or update any disclosures contained in the Annual Report, which continues to speak as of the original date of the Annual Report. Accordingly, this Amendment No. 1 should be read in conjunction with the Annual Report and the Company’s other filings made with the SEC subsequent to the Annual 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 Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this Amendment No. 1 to the Annual Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

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EXHIBIT INDEX

(d) Exhibits