Apple iOS 6.1.4 for iPhone 5 With "Updated Audio Profile for Speakerphone"
Apple has released iOS 6.1.4 specifically for the iPhone 5, which. As Dan Moren from Macworld astutely points out, Apple's somewhat veiled language in describing the upgrade - "updated audio profile for speakerphone" - may or may not mean that your voice will sound louder or clearer over speakerphone. It's only 11.5 MB, though, so it's worth a shot - at least if you're a heavy speakerphone user.
Learn more about iOS 6.1.4