I think this is an AT&T capacity issue. When their towers have more traffic than they can handle, some of them are not dispatched but sent to voicemail. This happens occasionally due to tower congestion. I have it sometimes with my 4S and my wife gets it with her 3GS. The only remedy I know is to switch to Verizon.
By the way, are you in a huricane Sandy affected area? This would likely exacerbate the problem.
Marc
Wellington, FL
--- In apple-iphone@yahoogroups.com, "strandbiker1" <strandbiker1@...> wrote:
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> I am on my second iPhone 5 with AT&T. Some of my telephone calls are going to voicemail and the phone does not ring. Yes, the vibrate switch is switched off. I do get an audiable voicemail notification and when I look at the screen, I see a recent call. The signal strength is -103 dBm. Any ideas anyone? What signal level does one have to have before the system goes directly to voicemail?
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> Skip
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