iOS 6.1.3 is available for OTA or iTunes install. If you have a jail broken phone phone it is recommended you don't download this update yet. Per an article in iClarified "Jailbreakers should not update to iOS 6.1.3 as it will likely remove the ability to jailbreak." My phone is not jail broke so I just downloaded and installed it OTA without problem. Allegedly, it contains a fix for the lockcode screen bug that allows someone to bypass the lockscreen and improvements to the Maps in Japan.