I am unable to update my phone thanks

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

Jaitwon22 Said:

"I am unable to update my phone thanks: Trying to update my phone"

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Determining if an Update will Install:

How to do so...

A. Verify Compatibility:

Confirm the model of your iPhone. If iPhone model is incompatible with iOS15, then it is because you iPhone does not meet the hardware requirements for this iOS version(s).

B. If Compatible...

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:

Use my User Tip:  Update your iPhone Using a Computer - User Tip