WiFi calling stopped working after upgrade to Android 11

[ctrlz]

Could try disabling VoLTE/4g calling, and seeing if Wifi calling works then. I know some Android's prefer to use 4g calling over Wifi calling if both are enabled. Where i live i barely get any 4g so before i got an iPhone i had to have 4g calling disabled to get anywhere.

[pddco]

Switching the phone to Airplane mode turns off the GSM/3G/4G radio bits so that’ll check whether WiFi Calling works or not.

[s1ms]

This issue is related to BT. Got confirmation. Apparently I am not the only one with non-working WiFi calling.

Trust me, I've tried all the above things and more before I contacted BT.

[MrBelter]

You probably know this already but dial *#*#4636#*#* to see if VoLTE and VoWiFi are provisioned on the SIM.

[s1ms]

SIM is fine and everything is working if I put it in another phone. A different SIM is working on well my phone. What is not working is the BT SIM on my Note 20.

[s1ms]

What an interesting sequence of events.

Decided to get a new phone. Got Samsung S21 Ultra 5G. Same problem. Wifi calling broken!!!

Samsung Korea got in touch with BT network Engineers with a solution and we've got if fixed!!! Permanent fix should be released with a new firmware upgrade. 

Very good collaboration with the BT Engineer!

[arjanvirdi]

I had the same issue with my Ultra 5G. Weird occurrence, I let the phone die, and after charging and turning it, it said new network features, and to restart. After that Wi-Fi Calling, and VoLTE appeared, and worked! Also, have you installed the software update? 

[s1ms]

my problem had nothing to do with that. There is an issue with the phone firmware that has been confirmed by Samsung Korea software team 😉 Trust me, I have tried everything. The good thing is we have found the issue and temporarily fixed it while we wait for the new software.

[Ian73]

I have same issue as yourself. What is the way around this. 

Cheers

[s1ms · Accepted solution]

You need to add a custom APN as per below instruction:

Settings - Connections - Mobile Networks - Access Point Names - Add - 

Name: ims
APN: ims
APN type: ims (Delete "default" that was written at the beginning)
APN protocol: IPv6)

Click Save