3G doesn’t work

[Mickyp3]

My 3G doesn't work on iPhone 13 pro max. 4G and 5G are fine, but it doesn't work on 3G even when my phone has full bars on 3G. It happens in multiple different areas. I've reset my net work settings, deleted the profile and reinstalled the net work settings and had a new sim sent.  I've complain numerous times, but nobody calls me back and I can't be put through o the department to help as they do t take incoming calls!!!!!!! Getting very annoyed now. 

[Wil+B]

Mines the same. iPhone 13 mini. Works fine on 4g & 5g but nothing on 3G. No incoming calls nothing

[Mickyp3]

I ended up complaining and they let me out of my sim contract. It's fine now on Vodafone.