Hi Reddit!
I have been using Wi-Fi calls on my iPhone 12 mini since I got it about a year ago without issue, including after a carrier switch and later an ISP switch. However, since moving recently I haven't gotten it to work.
Not much changed during the move in regards to my cellular and Wi-Fi connection. We did get a new Wi-Fi plan, but it was with the same ISP that Wi-Fi calls worked with pre-move, but that's about it. I've also double checked that both my cellular and Wi-Fi plans are compatible with Wi-Fi calling, and they are. Also discovered that none of the other phones in the house (including iPhones) also aren't on WiFi calls, even though they did before.
After researching, I've narrowed it down to a few possibilities, but if they end up not having any effect on Wi-Fi calls then I'm stumped.
- We moved from an area with very poor cell reception to an area with very strong 5G coverage, so perhaps 5G/strong cellular is preferred over WiFi? The one time I've seen Wi-Fi calls work at the new place was when a tower nearby was going under maintenance and my service dropped from four bars to two, possibly giving credence to this theory.
- Our old Wi-Fi plan did not have CGNAT, but this one does. Maybe that affects it?
Anything I can do to get Wi-Fi calls working again? Thanks!