How to update iPhone 6
How to update a iPhone 6 that’s stuck on 12.5.7
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iOS 12.5.7 is as far as the iPhone 6 can go. Why? The iPhone 6 lacks the horsepower needed to run newer versions of iOS.
If you want to run iOS 16, you will need an iPhone 8 or higher. If your carrier offers the new much faster 5G service, you will need an iPhone 12 or higher.