I want to update my iPhone 7 Plus
l want the latest version for my iPhone 7 Plus.
[Edited by Moderator]
An iPhone 7 Plus can update as far as iOS 15.8.1.
If you want to update to iOS 16, you will need an iPhone 8.
If you really want to update to the latest iOS 17, you will need an iPhone XR, XS or higher model.