So horrible to have sudden “no cellular service” when I have many important teleconferences daily. Luckily I got to a Verizon Store just before closing. One attendant had just been informed of the OS 14.4 problem. Went thru the normal reboot, then he decided to replace the SIM card which appeared to fix this issue immediately. However, reading thru other replies perhaps only needed to remove SIM card, reboot and replace same card. Anyhow, so glad was fixed and hope apple will not put out OS upgrades that render iPhone useless.
RobinQ
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