Reasons Not to Install iOS 9.2.1
Before you take the plunge with iOS 9.2.1, you'll want to weigh some of the pros and cons, some of which go beyond the update's performance.
We've put together a list of reasons why you should, and maybe shouldn't, install the iOS 9.2.1 update on your iPhone 5s right now.
There are obvious reasons like the lack of an iOS 9.2.1 jailbreak but there are others that you might not be aware of.
Our advice is to go down that checklist and decide what's best for you and your device. Most of you will eventually want to install iOS 9.2.1 but you might be better off waiting a bit before doing so.