Our iPhones have become the home of our digital lives over the last few years. If you're anything like me, then the chances are you spend more time fiddling around on your iPhone than you do using an actual computer these days. One of the main draws of smartphones is their 'always-on' nature - if you're not sat at home connected to a WiFi network then there's always the 3G signal when you're out and about. The problem is 3G isn't cheap, and with unlimited data plans fast becoming a thing of the past we all need a proper way of monitoring the amount of data we're using, and the measuring built into iOS just won't cut it.
