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iPhone5: When there is incoming call displayed as "Unknown", the iPhone5 will not ring or vibrate to alert there is incoming call.  Why? How to fix it?

3412 Views 6 Replies Latest reply: Jun 26, 2013 11:45 AM by cold6543 RSS
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Dec 4, 2012 7:16 AM

iPhone5: When there is incoming call displayed as "Unknown", the iPhone5 will not ring or vibrate to alert there is incoming call.  Why? How to fix it?

iPhone 5, iOS 6.0.1

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