Apple has launched the iOS public beta program which allowing anyone in a trial scheme to use the new iOS. This DOES NOT require your iOS device to be jailbroken and you DO NOT need to add your iOS device’s UDID to an Apple Developer Account. Install Beta version iOS DOES NOT void the warranty, but apps and services may not work the same because it is BETA! The benefits of using Beta version iOS are you are getting latest iOS, bug fix, and improvements. You can sign up for Apple’s Beta Software program by visiting Appleseed Beta testing site. However, you may not allow to use the iOS beta because it is invite based. You will have to wait to be selected. Once you are invited, you will have to option to download a iOS Beta Software Profile. After you install the profile into your iOS device, you will see the new version update available. 
If you don’t want to signup for beta program, don’t want the long wait for the invite, want a simple step to get beta iOS, following the step below.