I also cannot complete a WiFi call with my iPhone XR using Xfinity mobile and Xfinity WiFi with a 3 bar strong signal. I have Vonage using Xfinity WiFi with its only problem being I frequently have a 30-50 second point in time where one party can hear the other but not vice versa. The call does not drop and after a pause resumes. Vonage ‘works’ on your WiFi but my cell phone does not.
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