Hi thanks for this post. My iPhone 12 lost cellular service on 12/29/20 and I have had the device since November. I couldn’t receive or make calls Then this morning ,one bar appeared. I have Verizon service and I tried rebooting, toggling the airplane mode button, the carrier settings are up to date, I have iOS 14.3. I researched the issue and tried various cellular settings. I am trying to avoid the reset options because it seems that does not fix the issue after reading so many comments. It appears that Apple has a glitch? Has Apple responded to you? thanks!