I can’t update my phone to IOS 16.7.2

You told us that you have an iPhone 7 Plus.

The iPhone 7 Plus can only update as far as iOS 15.8

It cannot update to any version of iOS 16.

If you want to update to iOS 16, you will need an iPhone 8 or higher model.

An iPhone 7 Plus cannot run iOS 16 or higher.

See this article.

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

If you have an iPhone 7 or iPhone 7 Plus, this thread is about that model of iPhone......and answers have already been provided.

If you do not have an iPhone 7 or iPhone 7 Plus, you need to start a new thread and provide more details.

I want to update my iPhone ios16.7.2