iPhone 5 Data Consumption.

I've had my iPhone 5 with AT&T for nearly a week now and my data consumption has went off the roof, a little over a gig (1024 mb/1g) was used already. It doesn't seem right, I'm really worried because it's only been a week, I called AT&T and I wasn't getting anywhere with the late night people that were working, one was even an egotisical "I know it all" kind of guy who wasn't the friendliest. I understand, it's my data my problem, but I've had iPhones for years and I just signed onto AT&T because I hear good things, it's egotisical jrks like this that make any impulsive person to just be quick to cut their contract and phone lines and move on to another carrier, but this has only happened once, other times I've had great people, at any rate, nothing was really explained as to why my data consumption was this high in only a weeks time. It doesn't make any sense because I've used iPhones for years, nothing out of the ordinary as far as my usage goes and I'm almost always hooked onto WiFi at home. Is anyone else experiencing the same issues with the iPhone 5?

I hope there's a solution other than the inconvenience of having to shut off my apps completely. This is ridiculous. I'm not saying that I'm not happy with my iPhone 5, because I love it, it's extremely fast and a great piece of technology it's just this issue with AT&T. 

Let me know if you've been experiencing the same issues. Maybe you'll know a solution.

Thanks.