HT202340: iPhone: Understanding SIM cards
Learn about iPhone: Understanding SIM cards
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Helpful answers
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Jul 17, 2013 5:24 PM in response to irisher9by Ocean20,Try another know working SIM and see if you get service. If you do then your SIm has indeed failed and you need to get a new one from your carrier
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Jul 17, 2013 5:47 PM in response to irisher9by Ocean20,You might try taking the SIM out and reseating it