HT202340: iPhone: Understanding SIM cards
Learn about iPhone: Understanding SIM cards
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Helpful answers
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Jun 4, 2012 3:03 PM in response to babybigg78by brad805,Reset iPhone. If this does not work:
With iTunes open on computer, connect iPhone obtaining Recovery Mode, restore iPhone.
If this does not work:
With iTunes open on computer, connect iPhone, place iPhone into DFU Mode, restore iPhone.