How not install this update

Khurram789 Said:

"How not install this update: my mobile is not installed new update pleases update my mobile "

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Install a Cellular Update:

It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

Update the iOS Using a Computer:

• Use my User Tip:  Update your iPhone Using a Computer - User Tip
• IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

An iPhone 6S can be updated to iOS 15.7.9, no further.