How to update iPhone 7 Plus to iOS 15?
Update iOS 13.3 to 15
[Re-Titled by Moderator]
iPhone 7 Plus, iOS 13
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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
Update iOS 13.3 to 15
[Re-Titled by Moderator]
iPhone 7 Plus, iOS 13
Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support
And: If your iPhone, iPad, or iPod touch won't update - Apple Support
If the above Apple articles do not help, please post back with relevant information.
Make sure that you have a good strong Wi-Fi Internet connection and that the battery is fully charged.
Tap Settings > General > Software Update.
How to update iPhone 7 Plus to iOS 15?