Cellular Connection

Thanks for showing interest in my problem. Running iOS 16.3.1. I went to Settings > General > About, but there were no instructions, or options, for updating carrier settings. More often than getting the "Could not activate cellular data network" message, the phone is just been unable to join the internet (WiFi and cellular) after overnight charging. Went to Apple Store at they performed an exhaustive diagnosis routine (no problems indicated) and refreshed/reflashed the entire system. I re-built the phone from scratch (royal pain), not from a Cloud or macOS backup. The very next day, the system was unable to get internet.

Since the problem, in my mind, had something to do with the charging cycle, I switched from charging from a wall plug that had integrated USB ports to using a charging brick I got with my iPad. The next morning the system worked perfectly! Unfortunately, the very next day, the system refused to get on the internet again.

The failure to get internet in the morning started as a once a week occurrence and has gradulally become a near daily issue. Always, an on/off cycle solved the problem. It has never happed other that after an overnight charge.

MikeL.