RebelXSIM

X-SIM True Plug-and-Play iPhone 4S Unlock SIM Adapter without any setup, No need dial 112, no need to Cut your SIM, No cables No logs, No Apps, No JailBreak, Just insert and talk, Use any SIM card, without voiding your warranty, on any provider!.  Supports iOS 5.1 and baseband 2.0.1. Works with Sprint, AT&T, Verizon and other network that distribute Apple iPhone 4S.