Can I roll back to a previous OS version on the iphone 5? I updated my phone from OS 8.4 to 9.2. I don't like how my phone lags now and the battery lasts way less then it used. Can you guys please help if there is a way I can go back to OS 8.4?
iOS 8.4, no. iOS 9.1, yes. The reason your iPhone is lagging so much is because iOS 9.2 is beta software. iOS 9.1 is the latest public release of iOS 9 and is what you should downgrade to. Apple has instructions on their website on how to accomplish this.