HT202340: iPhone: Understanding SIM cards
Learn about iPhone: Understanding SIM cards
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Helpful answers
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Oct 2, 2012 12:19 PM in response to lizapataby ChrisJ4203,Sounds as if you have a phone that was not carrier unlocked and now is locked again to the original carrier. If that is the case, the only way to fix that is to contact the carrier the phone is locked to and see if you can get an unlock.