Q: what to do if your phone says no service

Try asking in the right forum.

Go and post in the iPhone forum and not the iWeb forum and next time - look before you post!!

Call your carrier to see if your account is configured properly.

Read: If you can't connect to a cellular network or cellular data - Apple Support

Hi

Ask your network provider for a simcard update / new simcard

Are your payments up to date?

Cheers

Brian ( UK )