Apple has released iOS 6.1.4 for the Apple iPhone 5 and it is now available to download. iOS 6.1.4 is a minor update for the iPhone 5 which is aimed at bringing an "updated audio profile for speakerphone". It is available OTA (over-the-air) and is just 11.5MB in size, which is even smaller than most app updates.The speakerphone profile basically sets the parameters for the quality of audio produced and while 11.5MB maybe a bit bulky for such a minor change, Apple hasn't revealed any other changes this update has to offer.
If you wish you can also download the updates through the following official links and manually install it on your device using iTunes.