My phone will not update the latest updates. I need help
iPhone 7, iOS 15
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See this Apple article: If you see No Service or Searching on your iPhone or iPad
https://support.apple.com/en-us/HT201415
If the iPhone still 'No Service' after you have optimize the range of the mobile network, see also ->iPhone 7 Repair Program for "No Service" Issues
https://support.apple.com/iphone-7-no-service