iphone 7 won’t connect to wi-fi; other devices - Mac; iPad no connection problems
iPhone 7 will not connect to wi-fi internet
no problems with other devices - iPad, Mac
iPhone 7
Try first to optimize the range of the mobile network, 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