Posted by: Brett
Apple has started rolling out a new build of iOS 5.1.1 with a new build number. The original version of iOS 5.1.1 had a build number of 9B206 and the new version has a build number of 9B208. The revised version of iOS 5.1.1 is only being pushed to owners of the GSM iPhone 4 who are not already on iOS 5.1.1 and it is unclear as to the changes the revised update entails.
You can update through iTunes or by going to Settings > General, and Software Update.