Some iPhones are locked to single cellular networks, especially iPhones bought in the U.S., while others are unlocked, meaning you can use them with any provider. It’s important to know which sort you’ve got (or are getting), as it could mean the difference between an enjoyable or frustrating experience when you get a new (to you) iPhone or want to switch networks. Outside the U.S. iPhones purchased from Apple or another reseller, are often unlocked by default, so
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