How to update to iOS 15

First, go to Settings/General/About and see what it says for model name. If it says iPhone 6 you can only update to iOS 12.5.5.

If it says iPhone 6S or later, go to Settings/General/Software Update and follow the instructions to update. Report back if you have any issues.

Update it from a computer or through the Software Update function in Settings.

(212530)