Originally Posted by
WIRunner
It seems you also can't turn on airplane mode and wifi back on to force wifi calling.
iPhone5S here on 9.0.2 - these are my T-Mo WiFi Call settings
Airplane mode - OFF
WiFi - ON (to whatever network)
Cellular - OFF
Carrier (status: T-Mobile WiFi)
and
under, Phone
WiFi Calling - ON (Make and receive calls over Wi-Fi with your T-Mobile account) ... plus E911 Update Emergency Address (done)
That's how we've been making T-Mo WiFi calls - using the cellular # under T-Mobile (not Hangouts or Talkatone, etc.) no charges or minutes deducted against any airtime, even when we're traveling abroad.
What's your setting - can it toggle the above & call ? It is a good start in the good direction for AT&T ...