Why can’t I update my iOS

Well, we could guess....but we would probably be wrong since there are about a dozen different reasons why an update might have problems.

Some of the most common reasons.....

Not enough space on your iPhone

Battery power too low

Phone is in Low Power Mode

Poor Wi-Fi connection

If your iPhone or iPad won't update - Apple Support

Can you post a screenshot of the message when you try to run an update?

What model phone?

What version of iOS is it currently running?

What happens when you try to update it?