Phone service

[Fonksters]

Samsung S22 ultra with Canada Us and Mexico plan.

I'm visiting in the Us and text and email are working but I can't receive or make calls.

[Fonksters]

Hey, thanks for your help. I've tried thAt with no success.

I went to an AT&T store today and they couldn't solve the issue.

They told me that I would have to call tech support.

I appreciate you trying to help.

Thanks.

[slusagm]

@Fonksters try Reset Network Settings first and see if the voice calls are better

Or after Reset Network Settings, see if you can disable automatic operator 

[Fonksters]

 it won't allow me to turn it off of automatic.

[slusagm]

@Fonksters you should be able to 
 go to Connections, select Mobile networks, and then tap Network operators. Turn off the "Select automatically" option, which will prompt your phone to search for available networks.

or post a screenshot

And currently with Automatic, which US provide it uses?

[Fonksters]

I do believe that is the issue but when I go to network operators it's in automatic network selection and I can't disable it to choose manually.

[slusagm]

it's a VoLTE issue.  I was able to use S22 and received call in US before so VoLTE is certainly working

Reboot your phone, and try AT&T, T-Mobile and Verizon, at least one of them should work