Is there a maximum number of devices yhat can be registered for WiFi calling?

You can deregister a device by simply turning off the Wi-Fi calling setting in Settings/Cellular. If there is a limit that is an AT&T limit; call their customer support. Apple has a limit of 5 computers and 10 devices on one iTunes account, but there are no other Apple limits. And it has nothing to do with Wi-Fi calling.

How do you “deregister” a device? I’ve signed out of my FaceTime account on each of the devices and logged back in. When I look at the list of devices on my AT&T account it shows all past devices that I don’t own anymore and logged out of iCloud before I disposed of them. I keep getting the error that I have the maximum number of devices registered and then when I try to use it now Numbersync won’t work away from WiFi, which also impacts my Apple Watch utilization. I already spent an hour with AT&T support and didn’t get it resolved.

Was anyone able to resolve the issue? I have the same thing and AT&T was unable to resolve the same. I had a previous watch which I had to unpair multiple times, which may have caused the issue. In my Wifi emergency address section, the numbersync addresses had 5 devices for me including 3 entries for apple watch. After an one hour call to AT&T this is no longer shown, but still wifi calling is not turning on with the same message of maximum device limit reached.

I'm also having this same issue. I turned off calls on other devices for each device and turned off wifi calling and waited 16 hours. I called AT&T and spoke with them for an hour but to my knowledge they didn't do anything, she only talked about bluetooth pairing, which has nothing to do with this 😠

I turned wifi calling and calls on other devices back on and after setting up one device I get the notice that I've reached the limit! So it's giving me a limit of 1....wow!

Also under the AT&T NumberSync emergency address screen I see every device I've ever owned listed but no way to remove them, and AT&T didn't know what I was referring to when I told them about that either. In the Calls on Other Devices menu in my iPhone I also see multiple entries for the same iMac -- even though it's only listed once in my iCloud settings and on my Apple ID account associated devices page.

This is really frustrating!

AT&T was able to reset the wifi calling .. so that I was unable to see other "ghost" apple watches in my numbersync .. but the problem stil persisted. However, after a few days it automatically corrected itself after the latest watchOS update. Though it reoccurs sometime when I restart my phone but most of the time it is ok now.

This is happening to me too. I’m with Verizon but they absolutely no help. Apple looked into the problem but no resolution came from it. I’ll try your recommendation.

Thanks. That still doesn't work for me to fix this issue, appreciate your help.

This didn't fix my issue.