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Helpful answers
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Jan 16, 2014 1:19 PM in response to martha02324by KiltedTim,Remove and re-install the SIM. If that doesn't fix it, try a replacement SIM from your carrier.
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Jan 16, 2014 1:19 PM in response to martha02324by ChrisJ4203,Try this support document http://support.apple.com/kb/TS4148