Recent Xfinity Mobile subscriber and ported 2 numbers from AT&T with iPhone 6s.  I live in a Houston suburb HOA where Cell Towers are not allowed so very weak cell signal in my home and previously used an AT&T Microcell booster to have good reception in house.  Now with Xfinity Mobile the booster no longer works so I need to rely on WiFi calling to ensure strong coverage within my home.    The Issue:   I would say on about 25% of all incoming calls when I try to answer the call it prompts "Call Failed" and sends the incoming call to Voicemail.  This could occur repeatedly where my wife called 3 times straight all with the same issue.  No problems with me hitting the call back button and reaching her.  I have very strong wifi signal and download 70 mbps and upload 7 mbps, ping 12 ms.  Seems to be only an issue when I am using Wifi Calling as I have never had the issue outside of my home.   Question: 1) Is Comcast aware of this issue and working on a resolution? 2) I can't imagine an easy fix on my end but please advise if there are any router settings that I would need to modify?  I a Netgear AC1750 Model R6400 Router. 3) I read that Xfinity "piggybacks" on Verizon so could I buy a Verizon cell booster for my home?  Verizon said I couldn't because I don't have a Verizon number that I could register.  My brother has Verizon I don't know if I could buy a booster put it on his account and then add my Xfinity Mobile number as a "boosted number".   Please advise as I have been actually recommending Xfinity Mobile to others but getting reluctant with these consistant "Call Failed" issues.   Thanks! ... View more