Update: Some people are experiencing a problem with i OS 9.3 that freezes their device if they click on links to websites in their emails. Apple has now launched i OS 9.3, its latest update to the i OS 9 software that runs on most of the world's i Phones and i Pads.
If you can't get to a computer with i Tunes you could visit an Apple Store and ask someone there to connect your device.
It may also be worth waiting a few days for Apple's servers to calm down after the initial rush of people downloading the update.
Also make sure your device has plenty of charge left in its battery, and that you're connected to a Wi-Fi network before you attempt to download and install the i OS 9.3 update wirelessly.
If your device stops responding while you're updating to i OS 9.3, try resetting your device by holding the power and home buttons down at the same time for around 10 seconds, until you see the Apple logo.
If that doesn't work, plug your device into a power socket and let it charge for around 15 minutes.
Apple has made i OS 9.3 available for free for devices running i OS 9, and the update should be waiting for you when you go to Settings Software Update.
However, what can you do if the i OS 9.3 update isn't showing on your device?
We've put together this guide covering the most common issues with i OS 9.3, and how to fix them, so if your i Phone or i Pad isn't behaving properly after the i OS 9.3 update, check out our list of issues below to see if there's a solution.
If you're experiencing a problem in i OS 9.3 that we haven't solved, let us know in the comments and we'll look into it.