Update s21 5g

[Kowal4]

After update, phone refreshing sim card during the conversation, loosing signal and Internet connection, so I have to call again... I did soft reset, doesn't help, I checked sim card on another device's, and working fine. Anyone got the same problem ?

[Kowal4]

I will do it tomorrow I think, this problem is very annoying

[GalaxyA51user]

Hope your issue gets solved
Don't forget to make a backup!

[Bccrookham]

Is the problem you are referring to the fact that wifi calling is no longer available (the setting and therefore also the functionality). I am having the problem as well. The SIM card works fine in another phone, but the setting is no longer respected in my s21

[gpaolo79]

Same here, since update I can't use the phone to make phone calls any more. 

I opened this thread about it:

https://eu.community.samsung.com/t5/galaxy-s21-series/s21-update-to-android-12-sim-continuously-rese...

Any reset, including factory reset, won't help. I'll take it to service next week...

[Kowal4]

After Hard reset phone is working fine, thanks for help.

[gpaolo79]

Lucky you, didn't work with me... 🙄

[Kowal4]

Try to take out second sim card

[gpaolo79]

I tried, taking it out, disabling one or the other, swapping them... nothing. Factory reset actually made things worse, now SIMs are resetting even more often than before.

It's actually even more odd: I have noticed that I get the message of "SIM data updated" which I get every time they are reset even with the phone in airplane mode, when the SIMs are not used at all.

I guess the people who are saying that they are getting they motherboard changed because of this are right...