I downloaded the free data usage app to track my usage. I was wondering if anyone has used the data usage pro? I would like to track by app. The reason is recently my usage has tripled. I cancelled my unlimited data plan on my 875u Sierra Aircard for the 5 gb hotspot on my iPhone. I never used more than 1.5 go on the Aircard with the laptop on ad less than 500 mb on iPhone. I am already at 2.2 gb usage in 16 days. I realize I added an iPad to the equation, but I don't have 4g service available and I use it instead of the iPhone. I turned off all syncing functions. All mail is downloaded manually, imessaging has been turned off, every night I close all programs from the background. I am trying to determine what app is causing the problem so I can remove it if possible.