I think I can say that the latest update Fixed WIFICALLING issue for me. I still hesitate, after over a year of dealing with this. But much more stable a week after the update. Latest IOS update, after that carrier settings updated as well. Sometimes it has a hard time locking into XMWIFI after I get back home, but when it does, it never switches back and forth between regular cell signal and WIFI calling. IPHONE 7 and IPHONE XR.
... View more
Your findings are very similar to mine. I’m running Dual-Sim and the Xfinity Mobile service is on the Physical Sim and AT&T on eSIM. Xfinity is Secondary to AT&T line. AT&T is much more aggressive in switching into WiFi calling then Xfinity(AT&T’s WiFi calling also has no issues) however I thought it could possibly be a function of the fact that it was not true primary connection. I’ve been testing with WiFi calling turned on and it seems like it will all work as it should for about a week or so and then strange things like Failed Calls begin to occur and I’ll need to do the Airplane Mode / WiFi shuffle to get things working again. I have not needed to reset network settings to get things working again although I have done it to appease Technical support. In regards to placing the phone into airplane mode, XM WiFi pops up and WiFi calling works just fine, it’s when it needs to go between the towers and WiFi that something seems to get hung up at certain points and something doesn’t register or associate properly. Thanks for the post! I’m glad to hear you are not having the issue on the Samsung phone.
... View more