How to update iPhone XS iOS?

Update your iPhone, iPad, or iPod touch - Apple Support

You may need to use a computer to perform then update, and that update sequence is (also) included in the linked article.

If you have an add-on VPN app, remove it, restart, and try again.

You will need to use Wi-Fi or a computer, and not cellular, to perform the update.

samanta70 Said:

"How to update iPhone XS iOS?: Software updates Ios 15.1 support iPhone XS"

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Update 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