S22 Ultra No internet connection

I had the same problem with S22 Ultra. Other forums (not T-Mobile, or other S22, S21 or S23 models, etc.) had different suggestions: reset mobile network settings, factory reset, replace phone (via Samsung, their carrier, or store), physically open phone (to change antenna flex and/or change usb-C assembly), etc. Some were successful, others where not.

Since my phone is more that 2 years old and out of warrantee, and thinking that Samsung parts are quite sturdy, and after watching a couple of Youtube videos (how to replace S22 Ultra antenna flex https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://m.youtube.com/watch%3Fv%3DQHZeoFpikeI&ved=2ahUKEwixgPDG7beHAxVsxQIHHXQDBpwQwqsBegQIExAG&usg=AOvVaw2f04dMX5bqflTFGTJUwLLR and S22 Ultra teardown https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.youtube.com/watch%3Fv%3DaC30DHRWB1A&ved=2ahUKEwixgPDG7beHAxVsxQIHHXQDBpwQwqsBegQIGhAG&usg=AOvVaw1L9zvldetK1Nxqw8_WCjlE), I decided to simply open the unit's back cover using a hairdryer (30-45 seconds) and Isoproply alcohol (after every 1-2 mm of little gap), and remove the 12 screws. Then, to remove the two smaller covers inside (as the videos indicate - over the battery, and above it, but without removing the cameras), you'll need to remove one or two Lego-like connectors.

At this point, the three band cables now have their Lego-like connectors exposed. I detached each of them (3 x 2 = 6 total) and placed them firmly back. I did not buy or change any physical part or circuit, just lift and push back ("re-sit") the Lego-like connectors.

With this "resitting" of the connectors (rather than "resetting" software, which I also tried with no success), the unit now connects well to 5G, and works good as new.

Hope this helps! You may also show this to your phone repair shop, if you're not confident with opening your unit. Anyway they don't have to buy anything for this solution.