Apple has shipped iOS 6.1.4.0 for iPhone 5 users. The update is for the iPhone 5 only, so owners of iPods, iPads and earlier iPhones wont be getting anything. Make sure voice dialling is turned off, since the bypass trick only works if it is turned on. The primary purpose of the update seems to be to improve speakerphone voice quality, so theres one more reason to turn voice dialled off! The update will only be available to owners of earlier iPhones and iPods.”]
Source: https://nakedsecurity.sophos.com/2013/05/03/apple-ships-jolly-uninteresting-update-to-ios-6-1-4/