The bug causes increased network activity and reduced battery life
Apple has released an update to its iOS, called iOS 6.1.2 to fix the Exchange calendar bug that could result in increased network activity and reduced battery life.
The update will be available for iPhone 3GS, 4 and 4S, iPhone 5 some iPads and iPod touch devices.
Apple acknowledged that the bug related to its Exchange calendar and offered to provide a fix which used to increase excessive communication with Microsoft Exchange Server.
The increase in network activity reportedly drained the battery life of iOS devices.
Apple released iOS 6.1.1 for the iPhone 4S after telephone operators warned their customers not to upgrade to iOS 6.1, claiming that it could lead to connectivity problems.
However , the company has yet to fix a security glitch in the iOS6.x operating system passcode which allows hackers to unlock iPhones and access address books, send emails and phone calls.