iPhone 13 Pro Max stuck in SOS only mode

On June 20th in the morning of. Out of no where, my iPhone goes into SOS only mode. After discovering that it wasn’t a cell phone carrier outage, and after numerous recommended trouble shooting attempts to clear the SOS only mode, I went ahead to contact my carrier to see if there is a fix. My carrier also couldn’t fix it thinking it is a network error and have escalated this situation further. I then decided to contact apple customer care to rectify the situation since nothing has worked to fix this problem.

after speaking with customer care it was recommended to see what solution my service provider will come up with to fix the issue. If that doesn’t work, then last ditch effort would be to factory reset the device. I have been without a connection for 5 days now and it’s a major inconvenience since I use this phone for work and to keep in contact with family and friends. Has anyone had any success after a factory reset with this conundrum?