How do I install iOS 16 on my iPhone 7?

The iPhone 7 cannot handle the demands of iOS 16.

If you want to run iOS 16, you will need an iPhone 8, iPhone 8 Plus, or iPhone X.

But since you will be looking for a new phone, it would make sense to buy a model that can run up to date iOS versions like iOS 18. An iPhone 15 or iPhone 16 would be recommended.

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.

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