How can I update my iPhone 7 Plus to iOS 16?

That app you are trying to download requires iOS 16.

Your iPhone 7 Plus as stated in your tagline can only be updated to iOS 15.8.3.

You will need to purchase a newer iPhone to run that app and many more on a later iOS software.

“My iPhone update 16.0.“

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Incompatibility is the Culprit:

You need iOS 16 or later. But your iPhone model(7 Plus) is incompatible with it. This is because it does not have the hardware cable of operating it. See here: iOS 16 and iPadOS 16 are Compatible with these Devices - Apple Support

Screenshot:

An iPhone 6s, iPhone 6s Plus, iPhone 7, iPhone 7 Plus, or iPhone SE 1 isn't capable of 16 or above; they require an A11 or better CPU.

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