UPDATE: The iOS beta just appeared for me, and after agreeing to some terms, the I accessed an Apple page on my iPhone and installed a configuration file. After a quick restart, the iOS 8.3 beta showed up in the Software Update section in my Settings, just like any other update. If you're not yet seeing the iOS Beta option on the Apple Beta Software Program page, keep checking.
Well, that didn’t take long. Shortly after Apple began pushing iOS 8.3 beta 3 to registered developers, it’s opened up its iOS beta program to the public as well.
The Apple Beta Software Program will now let anyone register and try out a beta version of iOS 8.3. If you’d like to try the update, you can enroll in the program and then sign up for the iOS public beta. It’s worth noting that the iOS beta program is slowly rolling out, so you may not see the iOS option quite yet.
Once you’re enrolled, Apple tells you that you should back up your iOS device. That’s probably a good idea. You’ll then download a configuration profile that’ll make the beta update appear in Software Update. If you install the iOS 8.3 beta but then decide that you’d like to roll back to the public release, you can erase the beta, reinstall the public software, then restore from a backup.
The update to iOS 8.3 includes diversified emoji, wireless CarPlay support, Google two-step verification, new Siri languages, and Apple Pay support for China UnionPay. It’s worth noting that since this is a beta, you may run into some glitches and other bugginess. If you’re one that likes to be on the cutting edge and have things before the general public, though, at least you can now try an iOS beta without having to shell out $99 to enroll in Apple’s developer program.