If you want to get your hands on iOS 9.3 ahead of its prospective spring public launch date, there are two legitimate ways to do it: a developer license or a public beta invitation. We'll outline both ways to get iOS 9.3 below, plus we'll include some instructions on downgrading in case you run into bugs.
Both those who sign up for a developer license and those who test betas through Apple's public beta testing program should use caution when installing beta software. It's called a beta because it's unfinished, and there are often significant issues and problems that can prevent apps and features from working, especially in the early beta testing process.
iOS 9.3, though relatively stable, should not be installed on a main iOS device that's used on a daily basis. Testing should be done on an extra device that can be easily wiped should something go wrong.
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Article Link: How to Download the iOS 9.3 Beta to Your iPhone or iPad