I had the same problem, but I had brought my IPhone over from ATT. Called numerous times, reset network, set phone to factory setting, had Apple run a check on my phone. Worked with numerous people from xfinity and Verizon. No one could fix the problem. After 6 months I finally gave up and went to T Mobile. Everything works perfectly with the same phone now. Really hated leaving as the price was great, but was too frustrating.
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