Multiple hours lost on this. Could not group text or send images, so no MMS. Just kept spinning. This is also a Note 20 Ultra 5g unlocked on AT&T. This solution did work by creating a new APN and copying the Androif settings exactly. AT&T earlier had suggested a new APN but did followed different steps and it didn't work. I'm surprised they didn't have this solution since it is their own. I made my own APN name to make it different and added the EXACT settings. The only one that I left different was the Ipv4/ipv6.