Massive Data Usage - Any way to Check what did it?

So I have searched the forums, and my problem seems to be very specific.

I tend to use 700-800 MB a month (at least following the past 2.5 years) and nothing has changed. This morning I woke up to a text message that I had reached my limit. But wait, my cycle started on the 2nd and I have the 2GB plan. Something is up.

I check online and I'm at 4806/2048 MB. Holy ****! I call up Customer Service and they go over with me that Monday, this past Monday, at 12am I used 2.5 GB in a transfer. Then the same day around 2pm, I used another 1.5GB.

He had me go to the Data Usage Calculator on the site and we slid up all the sliders, and that would put max at 28GB/mo. Well, if I follow this chunk random usage, I will be at a minimum of 25GB this month.

I have wifi at home and at work. This weekend, I only used my phone for email and texting--so it wasn't catchup from the weekend.  And the entire day I was at work with my phone charging (lol).

WTF? Is there any way to figure out in my phone what was going on that it sent that much info? A log file somewhere of what my phone was doing?

I came from an Eternity as many of you have.

Can anyone lend me a hand?
Thank you for your time!
~mae

Actually, the only new app that I had put on was the Yahoo Mail app, but I didn't think that was it. I think I'll get rid of it just in case.

The guy on customer service put a 'free unlimited' month on for me so I can figure out the problem and get it taken care of. So I have no overage charges for the month, but I'm keeping a darn good log of everything that does anything!


Thank you for the info. But do you know if there is a log that I could check what apps were sending things out?

~mae

Please let the Forum know if you find the answer.
jp

I dont see how the auto sync could use that much data.  I have mine on and I use mostly WiFi and I've only used 114 MB so far this month.  Its got to be something else unless you have TONZ of apps that are always checking for updates.

True.  But from reading the original post it seems they use mostly wifi also.  Seems to be more along the lines of a glitchy app but I guess they could be running TONZ of apps as well that constantly check...