I can’t update my iPhone
I’m using iPhone 7plus and when I go to settings and touch software update then the phone freezes.
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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
After you have optimize the range of the mobile network & the iPhone stll ’searching’, see ->
iPhone 7 Repair Program for "No Service" Issues
iPhone 7 Repair Program for "No Service" Issues - Apple Support