On your iOS app add a function that displays the percent of data used on the app icon on the home screen.
@ Gavin, to be honest we are looking at likely discontinuing the app. There are few users and decrease every day since we introduces shock-free-data plans. Now, people no longer check their usage as often since we send them notifications and pause their use once all the data is used up. Most of our customers now use our mobile friendly website which is just as easy as the app and comes with tons more functionality. You can look up your tab balance, change plans etc. Maintaining an app costs hundreds of thousands dollars a year and if there is little benefit to have 2 different ecosystems we would likely want to simplify things. Both for us and customers. Still appreciate the suggestion! :-)