S25 Ultra doesn't allow calls through 5G and 4G

[Ay25]

I just bought my S25 and when I make calls with 4G or 5G, people can hear me but I can't hear them. I've swapped Sims but same issue. 

[arianwen27]

Calls over 4 and 5g use VoLTE to make calls work. Calls for 3g and below use an older phone system.

If you've manually set your phone to 3g and calls work, here's some things to try.

Toggle VoLTE off and back on again in settings, do the same with wifi calling. Hopefully turning them off and back on again works. Also try a reboot, might as well

[Star_girl]

I was going to suggest back up all your data and do a reboot or factory reset.

[-Robot-]

3G has pretty much been turned off all over the world

I would suggest contacting you network provider first