Apple has sent out iOS 6.1.2 with a fix for a Microsoft Exchange-related issue that could cause iPhone user’s battery to drain quickly.  Apple said it fixes exchange calendar bug which could result in increased network activity and reduced battery life.  iOS users now can get update for it by going to the Setting–> General–> Software Update and then tap on Download and Install anytime.  You also can go to iTunes on your Mac/PC to get this update too.