I foolishly updated also to 14.4. After two days, no service. Always says searching and then stops and says no service. Took it to carrier, they couldn’t find a fault. I have done all troubleshooting, including resinstalling OS. Fresh copy of 14.4 and even from the setup screens, no service. I have it booked in to be looked at, but this will take days if not weeks, because I’m in New Zealand; no apple stores here.