Can you use it on a iPhone six

Update your iPhone, iPad, or iPod touch

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.7

• If you have an iPhone 6S through 7, you can update to 15.7.3

• If you have an iPhone 8 or higher, you can update to 16.3

Go to Settings > General > Software Update.

This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone or iPad - Apple Support Update your iPhone or iPad - Apple Support

This link will show you how to update using your computer -

Update iOS on iPhone - Apple Support Update iOS on iPhone - Apple Support

Your iPhone is too old and would not be compatible with the newer software updates.

Click ▶︎ iPhone compatibility with iOS 16 for the complete list.

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keiota Said:

"Can you use it on a iPhone six: ios update should be on iPhone six"

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For reference...

Updating an iPhone:

Use a Computer to Update:

Use my User Tip:  Update your iPhone Using a Computer - User Tip. If any updates are available, they'll install, sure enough.

Find out by tapping Settings > General > Software update.