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On Sunday, AT&T let go of its SIM-locked hold on iPhone users, allowing them to unlock their handsets for use with other wireless carriers.
To unlock an AT&T iPhone, the device needs to be off-contract. For most users, that means owning the phone for more than two years, but you can also get out of an existing contract by paying an early termination fee. Also, your account must be in good standing with AT&T to be eligible for an unlock.
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Unlocking an iPhone allows you to use SIM cards from local wireless carriers when traveling abroad, which are usually cheaper than paying for international coverage from AT&T. You can also use the phone on other GSM carriers in the United States, such as T-Mobile, although data speeds will be slower, and you can’t use an unlocked AT&T iPhone on Verizon Wireless or Sprint.
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