Unknown data usage on iPhone 4S?

My family and I all have smartphones (all iPhones except one) and on our phone bill, it says that we're already at 6.7 GB, in 15 days… Looking further into it, I noticed that on each phone, data was being used every hour. Like anywhere between 1 and 19, 000 KB being used exactly every hour. Like 3 KB at 1:49, 15 KB at 2:49, 7 KB at 3:49 in the morning. KB's aren't a lot, but when you have 6 devices using KB's every hour, it really adds up.

If you download the AT&T app onto your phone, you can see the data usage, minutes, etc. You can individually turn off each cell phone if you feel like your child (for example) is going over the limit and should be shut off. It will turn off the cell phones internet, but he/she will still be able to call and text.

Franky above, from 11-26-2012, did you solve this problem? Find a solution? This same thing is happening to my iphone 4 currently… AT&T has no answers, but the usage is definitely not mine, sites viewed that I have never in my life visited.