How will I update my phone 6s 15.8.3 to iOS 16.0

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 15.8.4, use a computer or the Software Update function in Settings.

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The iPhone 6s ran iOS 9 when Apple first introduced it in September 2015. It received six major iOS updates, but iOS 15 is the end of the line. If you need or want to run something more recent than iOS 15, it is time to buy a new iPhone to replace that nearly 10-year-old phone.

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