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Helpful answers
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Jan 27, 2014 7:18 PM in response to williamgervby ckuan,Your SIM might be faulty, ask your carrier for a new one.
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Jan 27, 2014 7:19 PM in response to williamgervby ChrisJ4203,In addition to what ckuan has provided, you might take the time to view this support document and see if anything here can help. http://support.apple.com/kb/TS4148