Same issue. I have an iPhone X. After spending several hours with Apple Support, they concluded that it was simply a carrier issue because they say I have an iPhone model within the "X-series" that is known to have issues with my carrier, but none of this was an issue prior to the iOS 14 update. They also are telling me that I am the "only person" reporting problems. I reboot my phone and sometimes I can get signal. Other times, like today, I've rebooted several times and not getting any signal. I've visited my carrier and also tried a new SIM card. This is totally Apple's fault and their denial is ridiculous.
DR_Aguilar
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