How do I update my iPhone iOS?

The iPhone 7 Plus can update only as far as iOS 15.8.3

You probably already have this update. Check Settings > General > Software Update to confirm.

The iPhone 7 Plus is not able to run iOS 16 or iOS 17, if that might be what you are asking about.

The iPhone 7 has reached the end-of-life support for Software Update to the latest iOS operating system.

You are invited to visit an Apple retail store to discuss your iPhone upgrade options.

Learn about the ⇢ iPhone Upgrade Program. 📲

Good luck! 👋🏼😉