hi guys... I was fighting with the same issues (iPhone XS/iOS 14.2/ Switzerland / no calls/mobile date possible/ NO SERVICE message): I requested a new SIM card from my mobile provider and now I am back to normal "ops" . everything runs smoothly.

Hi folks . Same here iPhone XS / Switzerland located/one week after updating to ios14.2 suddenly NO SERVICE . 3G was working for one day and that’s it . Apple chat support is saying to hand in the iPhone for repair as a software fault could not be the reason (funny). Tried all the things out which I found here . Hope the Apple guys will find a solution pretty ASAP. My mobile provider is also trying to help but no results so far . Will try a new SIM card and then hope for 14.3