What is the latest OS I can install on my iPhone 6?

An iPhone 5s, iPhone 6, or iPhone 6 Plus isn't capable of 13 or above; they require at least 2GB of RAM. To install 12.5.7, use a computer or the Software Update function in Settings.

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iOS 12.5.7 is the best that the iPhone 6 can do.

If you want to run iOS 15, you need an iPhone 7.

If you want to run iOS 16, you need an iPhone 8.

If you want to run iOS 17, you need an iPhone XS or higher model.

iPhone 6S and iPhone SE 1st Generation also works with iOS 15.