HT202340: iPhone: Understanding SIM cards
Learn about iPhone: Understanding SIM cards
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Helpful answers
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Jul 23, 2012 11:11 AM in response to bekkenhuis04by ChrisJ4203,What have you done to the phone prior to this happening? Did you do any software updates? If not, have you tried any of the user troubleshooting steps, power phone off/on, reset, restore from backup, restore as new?