No. I am also having problems making voice calls. It appears to happen at specific times, this morning it was 6:30 am and even though I had bars, my call would not ring. I used my husbands 4G iphone 5 with no problem. I suspect is has to do with my iphone 4 being on 3G. But I am definitely experiencing problems at specific times of the day occasionally early morning and definitely between 5:30 - 6:30 with placing calls and or sending text messages. I have also had people that tried to call me tell me that my phone would not ring.
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