Phone now says ' no service'.
See this Apple article: If you see No Service or Searching on your iPhone or iPad
If you see No Service or Searching on your iPhone or iPad - Apple Support
If you have an iPhone 7 check -> iPhone 7 Repair Program for "No Service" Issues
iPhone 7 Repair Program for "No Service" Issues - Apple Support
Have you forgotten your passcode?,
(< iOS 15.2) See this Apple article: If you forgot your iPhone passcode
If you forgot your iPhone passcode - Apple Support
(iOS 15.2 and newer) How to reset your iPhone, iPad or iPod touch if you've forgotten your passcode
How to reset your iPhone, iPad or iPod touch if you've forgotten your passcode – Apple Support (UK)
Have you forgotten your password? -> See this Apple article: If you forgot your Apple ID password
If you forgot your Apple ID password - Apple Support
Then see this Apple article: What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support