At&t wifi calling question

[jtmo3]

Anyone know when at&t wifi calling actually turns on on the iphone? Sometimes it's on with three bars, sometimes it's not with one bar.Anyone know the particulars on what it takes for at&t's wifi to come on? Seems to be no set way or time it's on, even though it's usually always on in settings.

 

[Rob Phillips]

According to AT&T wifi calling automatically comes on when cellular signal is weak or unavailable. There really isn't much more information aside from that. Perhaps someone else knows more.
https://m.att.com/shopmobile/wireless/features/wifi-calling.html