Want to update my iOS 15

Hello ~ Take a look here to update your iPhone to current iOS…

Update your iPhone or iPad - Apple Support

If you are having issues click on below…

If your iPhone or iPad won't update - Apple Support

~Katana-San~

If your tag line is correct and you own iPhone Xs, you can update to the most current iOS 16.6. If your tag line is also correct and you haven't updated from iOS 14, you've missed a couple years worth of updates, so you likely will need to use your computer to update to the current iOS.

This link will tell you how to do that --> Update your iPhone, iPad, or iPod touch with iTunes - Apple Support (PH)