How quickly does your cell provider update their records? I know Virgin (or Bell) you can log in and check your data usage anytime. They even have an app (for Android, but probably for iOS as well) that you can check your phone usage stats with them.
edit: oops, missed the part that you wanted to know the data usage for each app.
Last edited by Wormius; 03-06-2014 at 02:42 PM.
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