How to update my iPhone 7 to latest version of iOS ?

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. To install 15.8.2, use a computer or the Software Update function in Settings.

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Marysam244- Said:

"Update a iPhone 7: How do I update my phone"

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Updating an iPhone:

Have a computer around? If so, use a computer to perform this. If any updates are amiable, they'll install, sure enough  Update your iPhone Using a Computer - User Tip