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.
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