There have been many updates recently for iOS 6.1 to fix different bugs. Developers have been given access to the beta 2 pre-release version of iOS 6.1.3 that offers improvements for iPhone 3GS, 4, 4S, 5, iPad 2/3/4 and iPod touch 4th gen and later.
Most importantly, the update fixes the lock screen security flaw.There is a security fault that allows other to access phone contacts and other information from the lock screen by canceling emergency dialing and tapping the power button.
Other features include enhancements for maps in Japan. Once a beta test update has been installed, you can not go back to a previous version.
Some believe that update will also cut out certain jailbreaks. From the last beta release to the release to the public took about a week. Hopefully this will come out soon.
On February 19, Apple released the iOS 6.1.2 update to fix the Exchange calendar bug.
One January 28, Apple released iOS 6.1 for iPhone 3GS and later(4, 4S 5) , iPad mini, iPad 2, iPad 3rd generation and iPad 4, as well as iPod Touch 4th generation and after. The iOS 6.1 update added LTE in some markets, fixed bugs, added Siri ticket buying as well as other features.
To check for updates Go to Settings > General > Software Update. iOS will automatically check for available updates.