I have the same problem. I brought an iPhone 6 Plus and an iPhone 6S Plus unlocked from Verizon. With Verizon cell service, WIFI calling worked well. Now with Xfinity, we cannot call each other on WIFI calling reliably even thoug we are in the same house with full strength xfinity WIFI. This is made worse because we live rural and have between zero and 1 bar of cell signal. We are very close to going back with Verizon and paying the $110 monthly bill again. Your free cell service with xfinity internet is useless at this point. Help soon or we will be gone... Robert Edens
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