I want to update the iOS on my iPhone

Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

suraju160 Said:

"Update my apple iOS"

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Updating an iPhone:

A. What to Update:

Update Installed Apps along with the iOS.

B. Determining if an iOS Update will Install:

How to do so...

I. Verify Compatibility:

Identify your iPhone model. The first thing that comes to mind in incompatibility being the culprit. So, confirm the model of your iPhone. If iPhone model is incompatible with iOS15 or iOS16 then it is because you iPhone does not meet the hardware requirements for this iOS version(s).

II. 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

Follow these steps, testing after each step:

• Software Update.
• Update iOS on iPhone.
• If your iPhone won't update.

Need more help?

• Chat now or call 1-800-APLCARE.
• International Support.

Click ▶︎ iPhone User Guide. 📖