When Sprint started selling the iPhone 4S, it was initially available with an unlocked SIM. However, it now appears that Sprint has decided to lock the SIM on any new iPhone 4S devices when they are ...

Sprintfeed reports that Sprint will be SIM locking their iPhone 4S SIMs starting on November 11th. Starting tomorrow, all iPhone 4S devices will have the SIM locked. The locking occurs during the ...

Sprint cleared up its policy regarding international roaming on the iPhone 4S Thursday, announcing its intent to lock the phone’s micro-SIM slot and then unlock it for good customers only by request.

China Unicom, currently the only sales agent of iPhone 4 in the China market, plans to lock iPhone 4s to its SIM cards in a bid to prevent contract-bundled purchasers' reselling iPhone 4 at high ...

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers finish ...