Latest IOS version
how to update the latest version
iPhone X, iOS 12
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Depending on your iPhone's present iOS.
And if you actually have and use a macOS
that'd be for another ASC area & question.
Try automatic updates?
• Update your iPhone, iPad, or iPod touch - Apple Support
https://support.apple.com/en-us/HT204204
You can see if the phone is updated to last
supported version in its System. ~ IF that's
not upgradeable to latest (iOS 14.x) it'd stick
OK for awhile at iOS 13.7. Some user's other
older devices or macOS, won't hand-off later.
• How to update to iOS 14 or iPadOS 14 - Official Apple Support
https://support.apple.com/ios/update
• About iOS 14 Updates - Apple Support
https://support.apple.com/en-us/HT211808
Take care & good luck!
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