How to update my iPhone to it's latest iOS version

Update your iPhone, iPad, or iPod touch

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.7

• If you have an iPhone 6S through 7, or SE 1st generation, you can update to 15.8.1

• If you have an iPhone 8 or X, you can update to 16.7.5

• If you have an iPhone SE (2nd generation or later), or XR through 15, you can update to 17.4

Go to Settings > General > Software Update.

This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone or iPad - Apple Support

This link will show you how to update using your computer -

Update iOS on iPhone - Apple Support

For information on how to update the version of iOS running on your iPhone, see:

Update your iPhone or iPad - Apple Support

Updating iOS: common issues and solutions - Apple Community

If your iPhone does not offer any updates, it is probably because you have already hit the current end of the line. This depends on the iPhone model. For instance, while an iPhone 11 can run the latest release of iOS 17, and an iPhone 8 can run the latest release of iOS 16, an iPhone 6 will never be able to run iOS 13 or higher.