HT202340: iPhone: Understanding SIM cards
Learn about iPhone: Understanding SIM cards
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Helpful answers
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Jun 27, 2012 6:50 PM in response to Woodysavedby sagarpachorkar,The SIM card might not be resting properly in the tray which causes the issue. Remove pop out the SIM card, turn off the phone, make sure it's resting properly and firmly into the tray, pop it back in, and turn on your phone!
This should solve your question