Same thing here. Yesterday I removed Norton AV and for 1 minute I had connection but suddenly again the NO SERVICE message. I also have an old iPhone 5s and is working fine. I have a iPhone 8 Plus, IOS 14.4.1. Tried using another SIM card and same thing.
Besides the Norton AV, what other app could be bothering??.
CarinaARG
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
Buenos Aires, Argentina