I want to upgrade my iOS

Marking your own post as Solved may prevent others from trying to help because they think you have fixed your problem.

Is your device compatible to update to the new version? See the article(s) below. 

iOS 16 compatible devices

IOS 15 and iPadOS 15 Compatible Devices.  *

iOS 14 and iPadOS 14 Compatible Devices.  *

iOS 13 and iPadOS are compatible with these devices - Apple Support.  *

Your iPhone is too old and would not be compatible with the newer software updates.

The time has come:

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