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Help Massive data used by Phone application

My dad has a Atrix 2 and uses the My data manager application to monitor my data usage. All of a sudden, the "phone" application (which I presume to be similar to the dialer application, yet different from the contacts application) used 160 MB within 24 hours. It is really random, and on a 200MB plan, it is kind of a pain that something used 160MB with still half the month to go. Has anyone had any similar issue? I need help explaining this, I have no idea what caused this, and as usual, AT&T is useless.
 
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