The new version of the operating system brings an “updated audio profile for speakerphone”.
iOS 6.1.4 is not available for other iDevices, it is a 11.5 MB download, as an Over the Air (OTA) update.
The new software update is now available for download and install.
Apple is rumored to be working on the next update to the iOS.
iOS 7 is expected to be launched at the Worldwide Developers Conference in June.