iPhone 5s iOS 9.2 Update: 11 Things You Need to Know

You Can't Downgrade to iOS 9.1

You can't downgrade to iOS 9.1 if you download the iOS 9.2 update. Apple's plugged up the loophole and it's gone forever. Now, when you download the iOS 9.2 update, you'll be stuck there forever. 

So, if you haven't made the move yet, you're going to want to prepare and you're going to want to dig into as much feedback as possible to ensure that this is the right move.