How can I update my iPhone 7 Plus?
Steps in updating my phone
[Re-Titled by Moderator]
iPhone 6s
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Steps in updating my phone
[Re-Titled by Moderator]
iPhone 6s
Your subject line says you are asking about an iPhone 7 Plus; your tag line says you have an iPhone 6s. Either of those can run the latest version of iOS 15, but no higher.
Update your iPhone or iPad - Apple Support
iPhone 7plus
New update
iPhone 7 Plus cannot run iOS 16 or iOS 17, if that is what you are asking about.
How can I update my iPhone 7 Plus?