Apple has rolled out the iOS 6.1.2 update today. This update will fix the battery drain problem that a lot of users have experienced, particularly those who use the Microsoft Exchange calendar. The bug was causing increased network usage, leading to quicker battery drain.
It is a fairly small update – just 12.8MB, and can be downloaded over-the-air on the device. The release note on Apple’s support site simply says iOS 6.1.2 “fixes an Exchange calendar bug that could result in increased network activity and reduced battery drain.” This update is meant for “iPhone 3GS and later, iPad 2 and later, iPod touch 4th generation and later and the iPhone 5”.
What this update does not fix is the passcode bypass issue created by the iOS 6.1.1 update. The v6.1.1 update was rolled out to fix certain 3G connectivity options after the mobile operators in Europe, including Vodafone U.K., asked iPhone users to not upgrade to the then latest version of iOS. The issue was with intermittent dropping of connectivity, issues with sending and receiving texts and making calls.
Coming back to the bypass issue, the iOS 6.1.1 update opened a vulnerability that allows prying eyes to bypass the passcode protection on a device through a series of hardware key presses. It was expected that Apple would solve that with this update. But it seems we are now on to iOS 6.1.3 to fix that issue, hopefully.
Incidentally, this update comes on the day when all eyes are on the HTC One, their latest flagship phone to take on the Android rivals.
Source: Apple Support