No service
I been having a problem with my phone saying no service all day for some reason it will not connect to cellular data . It mentioned that I needed to update and it read error after trying
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See here......If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart - Apple Support
Also this...Update your carrier settings on your iPhone or iPad - Apple Support
And/Or...If you see No Service or Searching on your iPhone or iPad - Apple Support
This may apply to your phone...iPhone 7 Repair Program for "No Service" Issues - Apple Support