I can't update my iPhone to iOS 15.7.5

Need more information, what did your iPad show during the updates?

Hello ~ Take a look here by clicking on below…

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

The link above contains something of the reasons you may not be able to update and their remedy. Post back if necessary with more details.

~Katana-San~

What happens when you attempt to update?

What is the existing version of iOS?

Please I want to update my I phone 7 to from iOS 15.3 to 16 or 15.7

cant update my iphone to 15ios version

Just FYI, you are responding to a post that is over a year old.