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I had trouble with Wi-Fi calling turning off. T-Mobile was not able to help me. After much research, I figured out it was a SIM problem. I have an android phone, Samsung Galaxy S9 so not sure this will work for your Apple. But if you go into the app that are installed on on your phone, there should be a listing for a SIM tool kit. Click on SIM tool kit clear all cache and data and reboot phone. My Wi-Fi calling came backup and has it gone down since. If
Thanks whatthe?? Interesting that you found to be a SIM problem. I
stopped by the T-Mobile store today and chatted with them. They offered to
replace the SIM card, though they didn’t think it would help. Guess what
.... it DID!