(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 ...

What does it mean if your iPhone is locked? If your iPhone is carrier-locked, it's only going to work with the cellular provider that locked it. However, if your iPhone isn't locked, you'll be able to ...

Apple appears to have reversed course in Japan on a key feature of its iPad 3G: It won’t offer a version capable of being used with different cellular carriers there. All Japanese models will be ...

Every smartphone is either locked or unlocked, depending on where you buy the device from. When you acquire a new mobile phone directly from a U.S. carrier like AT&T or Verizon, it will be locked to ...