S21 -- wifi calling issue. Repeately dropping out of wifi calling mode.

[Rahul Lahiri]

I use T-Mobile. With the new S21, I am periodically losing the wifi calling ability. The setup is wifi calling preferred -- the cellular signal is pretty weak around my home. Wifi calling works great immediately after a reboot. Within a day or less, the wifi calling ability quietly drops -- no error messages. Wifi itself is still perfectly fine, and internet connectivity is not affected. The only way out of this state is either to stop and restart wifi connectivity, or to reboot the phone. The last 4 years I had a S7 and had no issues with it. I transferred the same sim to the S21.

Unfortunately Samsung help has not been all that helpful. They have had me clear cache from a protected mode restart, cleared the cache for the phone app, reset my network configuration, reset all configurations, ... -- but the problem keeps happening. 

I checked with T-Mobile, and all configurations at their end seem to be fine. The only thing that they suggested to achieve parity with the S7 is to select the network config without 5G, and see if I still have the problem. I switched to that config a couple of hours earlier. Waiting to see how this holds up.

Anybody else facing this problem on the S21? 

[Demondam555]

The stupidest way to fix the issue is to turn the phone on airplane mode. reconnect Wifi only. Set up Bixby routines for when you are out of the house. SMSs sending and receiving is a pain as you need to turn off Airplane mode, but at least calls are stable. 

[FredGl]

Having exactly the same problem as everyone had reported in this post. I have Samsung galaxy s21 ultra in the UK on the 3 network and previously had a note 10. Both have the same problem with wi-fi calling. It simply drops my calls for no reason when on a wi-fi call. It doesn't do it all the time. Just as I am regaining confidence in the WiFi calling it decides to ditch every call thereafter. It does seem to be forming a pattern of behaviour. It has to be a software issue that Samsung should be fixing as a priority.

[rdc1]

it is Jun 21 and I have the Ultra 21 and use Vodafone and have exactly this issue, has anyone got a fix yet.  Pls Samsung fix our very expensive phone

[rdc1]

I have an Ultra21 and use Vodafone.  Has anyone got a fix yet?  Pls Samsung fix our very expensive phones!

[darrenltw]

It's July 6 already, and it's the same thing. Keeps dropping out every few mins and reconnects..... SAMSUNG please fix this right away! 

[Members_cHIg7KC]

I am having the same issues with my s21 on 3mobile. I have complained to 3 about the signal in my area and I was told to use WiFi calling on my phone which is even worse. This is my first Samsung after having iPhone for the last 10 years and its the worst phone I've ever purchased. I can't say one unique good thing about it and samsung customer support is awful as well, their answer to everything is factory reset like that going to fix a cr@p phone. Oneplus I'm think next 

[Pottsy320]

I have this issue. Every 1-2 days I have to reboot to get WiFi calling. Any fix, other than a Pixel 7?

[Pottsy320]

Now it's 3 to 6 hours between reboots. Does it on all WiFi networks I connect to, and I have tested the SIM in another phone and it's fine.

Reset networks. No better.

Wiped phone, installed no apps, no better.

[Pottsy320]

Fixed by the December update, thank you.

[FC360]

I've just started to have this issue in the last few months although definitely got worse in January. Interestingly I did quite a bit of research and from what I've read the wifi call dropping is caused by the ISP or router however everyone who says they discovered and fixed the issue never say what the issue is and how to fix it. The closest is someone said "down to the router and asked Dyfed Telecom to change it" I'm curious if anyone might know what setting it could be?