One UI Update 5.1 to S21 Ultra has messed up my cell service

[BadRandy217]

Early this week my phone did the One UI 5.1 update. Ever since then my cell service has been crazy. In areas where I know there is solid 5G (AT&T) my phone won't show 5G or even sometimes won't even show being connected and I can't use it. Sometimes when my phone is showing 5G it won't let me call, send text, or even use the internet. I've checked the service in the areas on the outage maps and they aren't showing problems. I've held my phone next to another ATT phone and theirs is working fine and mine isn't.

I've been through hours of tech support. I've done everything from clearing the Cache, restoring the phone. Using their diagnostic tools and the phone mechanically is fine. AT&T is repushing the latest update to my phone and hopefully this fixes it.... but if not what else can I try?

Forgot to add had att change out my Sim as well and it didn't fix the issue. 

[Picksomething4me]

Are you using the beta?

[BadRandy217]

No I'm not part of beta on my phone

[VerbumVeritum]

Hey there! Did AT&T try resetting your network settings, or Recovery Mode's "wipe cache partition" or "repair apps" options?

[kingbagel]

I did both of em through the recovery mode and still can't do anything that requires data.

[VerbumVeritum]

Is this only affecting carrier data/calls/texts and Wi-Fi otherwise works completely fine?

[kingbagel]

Wifi worked fine Carrier data calls and internet wouldn't.



Update. Shortly after my last comment everything started working again.

[VerbumVeritum]

So now all is fine? Just randomly?

[kingbagel]

Yeah. Shortly after my comment about wiping partition and repairing apps everything started working fine.

[VerbumVeritum]

That's great news! Hopefully this is permanent! 😀