My wife's iPhone 11 is running iOS 14.4. Issues started when phone was replaced under AppleCare+ ~ mid-December/20. We ran a few of the suggested steps but after about a week, the issue disappeared. All was fine until a couple of days ago. Call to Apple resulted in a recommendation to call provider after phone settings reviewed remotely. Call to provider (Bell Canada) identified "an outage in your area" (son on same provider in same house is working). After call, I reset to Network settings and this worked all evening but issue returned by this morning and same process doesn't resolve it. No VPN software has ever been used. Plan to attempt a clean install and restore shortly. One thing I noticed though - in Settings - General - About, "Modem Firmware" is blank. I assume that should show a version, even if there is no SIM, antenna issues, carrier outage, etc. This firmware should enumerate when the phone powers up. I'm curious if anyone else is missing this info as well. That means that either the code that scans the modem is corrupted or (more likely) this is a hardware problem.