My iPhone 7!need to update?
My iPhone7 doesn’t have service
iPhone 7
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What do you mean by doesn't have service? Can you connect to WiFi? What do you need to update? The IOS version? More information would help.
Get help with over-the-air iOS updates
Update – Can’t or can’t restore
Have you tried using iTunes on a computer or Finder if running Catalina to do the update?
If you see an error when you update or restore your iPhone, iPad, or iPod