Recently, Apple released iOS 6.1 to the world and it was a huge success with an amazing amount of adoption rates within 24 hours of its release. But as with any piece of software, this one too isn't without bugs. Quite an amount of iPhone 4S users have reported that iOS 6.1 is messing with their 3G reception and Apple even confirmed it to an Indian, themselves. Vodafone even appealed to its users to refrain the update until Apple fixes the issue and as usual, Apple has quickly come up with the solution through iOS 6.1.1, an update for iPhone 4S users only.
As it can be seen, the update weighs at 23 MB only via OTA but if you insist on updating through your computer, then you can either use iTunes for the process or click here to directly download the IPSW file for the new iOS 6.1.1. As Apple has acknowledged and promised to resolve, this update deals only with the 3G reception issue of the iPhone 4S that many reported to crop up when they updated to iOS 6.1.
There is a good news for jailbreakers. You can safely update to this version as evasi0n, the iOS 6 untethered jailbreak tool, supports this version as well which means Apple din't have time to patch up the security holes.