Still having troubles with wifi calling. Submitted error report. But callers are unable to be hear on outgoing calls when answering, and when called back they state they can barely hear me and can hear themselves. Go back to network settings, T-Mobile, and all calls work as needed. With volume normal and no echoing.
So today I've been using wifi calling and it's working so far. Thought I had it turned off but it's actually been better. Don't know if when I updated the carrier services app the other day it fixed it? But today so far it's not a problem.