How to update my iPhone 7
How to update my iPhone 7+
iPhone 7 Plus, iOS 14
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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.
How to update my iPhone 7+
iPhone 7 Plus, iOS 14
It tells you right in your screen shot, you need a WiFi connection to perform the update.
You also need to charge your battery over 50% to do the update. Better yet, charge it and leave the power supply plugged in while updating.
You can also update using a computer.
Click on this link for instructions on how to update your phone using a computer
Update iOS on iPhone - Apple Support
How to update my iPhone 7