Joint Filing Agreement

Exhibit 99.8

Joint Filing Agreement

The undersigned hereby agrees that they are filing jointly pursuant to Rule 13d-1(k)(1) of the Securities Exchange Act of 1934, as amended, with respect to the shares of common stock of Virgin Mobile USA, Inc. The undersigned further agree and acknowledge that such shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained herein, but shall not be responsible for completeness and accuracy of the information concerning the other, except to the extent that it knows or has reason to believe that such information is inaccurate.

Dated: September 11, 2008						Corvina Holdings Limited
						By:		/s/    Xxxxx Xxxxxx
						Name:		Xxxxx Xxxxxx
						Title:		Director
						Cortaire Limited
						By:		/s/    Xxxxx Xxxxxx
						Name:		Xxxxx Xxxxxx
						Title:		Director
						Gamay Holdings Limited
						By:		/s/    Xxxxx Xxxxxx
						Name:		Xxxxx Xxxxxx
						Title:		Director
						Virgin Group Holdings Limited
						By:		/s/    Xxxxx Xxxxxx
						Name:		Xxxxx Xxxxxx
						Title:		Director
						/s/    Xxx Xxxxxxx Xxxxxxx
						Xxx Xxxxxxx Xxxxxxx
						Cougar Investments Limited
						By:		/s/    Alison Xxxx Xxxxxx
						Name:		Alison Xxxx Xxxxxx
						Title:		Director
						Plough Investments Limited
						By:		/s/    Alison Xxxx Xxxxxx
						Name:		Alison Xxxx Xxxxxx
						Title:		Director
						Deutsche Bank Trustee Services (Guernsey) Limited
						By:		/s/    Alison Xxxx Xxxxxx /s/    Xxxxx Xxx Xxxxxx
						Name:		Alison Xxxx Xxxxxx
								Xxxxx Xxx Xxxxxx
						Title:		Authorized Signatories
						RBC Trustees (CI) Limited
						By:		/s/    Xxxxx Xxxxxx
						Name:		Xxxxx Xxxxxx
						Title:		Authorized Signatory