Both my Mum (I'm British) and Sister have a Galaxy s5 both of them struggle to get through the whole day without charging their phone and are usually in a rush when they charge it, so for Christmas I thought of getting them a 3.0 usb cable but I've read that if the plug supports 2.0 then there wouldn't be any change in the speed. The plug is the same one that was shipped with the phone. Will it be 2.0 or 3.0? Am I just wasting my money or would it work?