How to update your iPhone or iPad to the iOS 10 beta
One available version of iOS 10 is the developer preview. This is basically a pre-release beta testing version, but Apple calls it the developer preview beta to distinguish it from the public beta which is much more polished and became available to non-developers on 8 July.
To start the process of downloading and installing iOS 10, you'll need to sign up to the Apple Beta Software Program and then enroll your device.
It's important to back up your iPhone or iPad first (find out how to back up your iOS device by clicking here).
You'll then want to open this link using your iOS device and click the link in step two on that page to download the profile that matches your device. Once downloaded, the software update will be available by going to Settings > General > Software Update and tapping Download and Install.
How to get the iOS 10 Developer Preview
First, while iOS updates are generally free, downloading a developer preview requires a developer account, and this costs money - £79 per year.
As the very first version of iOS 10, the developer preview is likely to be riddled with bugs and glitches - that just comes with thew territory, and you can't say you weren't warned. The idea of using the developer preview is that you're testing compatibility with software you're building, not having a grand old time using the features normally. If you do install iOS 10, don't put it on your main device. Install it on a device you can cope with being temporarily crippled if the OS is buggier than expected.
More seriously, third-party developers have only just got their hands on the OS, so you can't expect apps to work with it properly. Some apps won't work with iOS 10 at all. The developers should sort out any problems ahead of iOS 10's final launch - at least, they should if they plan to continue to support their app through another OS update, which isn't guaranteed - but this may take a little while.
A final warning: you're not supposed to install iOS unless you're a software developer. It's a fairly open secret that some Apple fans pose as developers in order to get access to brand-new OS updates - and they pay Apple for the privilege, remember - but this is officially against the rules and we do not recommend it.
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