How to successfully put an AT&T sim card in an unlocked Verizon iPhone 4S?
Acquired an unlocked previously verizon 4s, would like to put my at&t iphone 3gs sim card in it
be wary i have researched and spent countless hours learning all about the specifics of GSM/CDMA, unlocking, and foreign country roaming policies. So please do not stray off topic and give specific answers/reasonings.
If your iPhone is unlocked you can use it with any sim card and carrier.
Verizon only unlocks phones for use outside of the US.AT&T or other US SIMs don't work. If it is in fact fully unlocked though then there isn't a problem and it should just go right in.
Using any method to unlock the phone otherwise without Verizon's permission is against the law now, so if it's not fully unlocked now then you can't legally do so yourself.
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