My iphone is showing me that that I cannot activate your iphone because the activation server is temporarily unavailable. And the phone is searching
iPhone 7
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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 still don't have a 'service' after that, see -> iPhone 7 Repair Program for "No Service" Issues
iPhone 7 Repair Program for "No Service" Issues - Apple Support
Charge also the battery > 70%.
Then try again.