Unlike Verizon which unlocks all its 4G devices, AT&T still locks its iPhones to its network. This means you cannot take your AT&T iPhone, drop in a T-Mobile SIM and expect it work. Before you can bring that iPhone to a new carrier domestically or overseas, you have to meet the minimum criteria and go through AT&T’s official channels to unlock the device. Want to find out if your iPhone is unlocked? And how to unlock it if it is locked? Read on for information on unlocking your iPhone on AT&T’s network.
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