Can I upgrade my iPhone 7 on 15.8.2 to 16?

iPhones 6S through 7, and SE(gen. 1), will only update to iOS 15.8.2

hi there quick answer for your question is NO. know more about your device iPhone 7 - Technical Specifications - Apple Support (IN)

if the app that you are downloading is not supported on your currect IOS you do this How to contact an app developer - Apple Support (QA)

here are the model which supports latest iOS 17 is compatible with these devices.

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