So how do I update my iPhone 6s to iOS 15.8

TonyEl-Wonder Said:

"So how do I update my iPhone 6s to iOS 15.8: I want to download an app but I am told I can download if only I have iOS 15.0 and more ."

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Updating an iPhone 6s to iOS 15.8.

Update Using a Computer:

1. Back Up First:

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

then...

2. Proceed with the Update:

Go Here:  Update your iPhone Using a Computer - User Tip