IPhone 5s AT&T Data Usage Problem?

I bought my iPhone 5s about 2 months ago. Since I had it, my data has spiked up so much. I was on the 2 Gb of data plan for AT&T until I got my iPhone and they switched me to the family plan. When I had my 2GB plan, I almost never went over with my Galaxy S3. Now with the iPhone, I used 13.6 GB! My bill is now up to an extra $200! What do I do about this?
PS: Last month I used 7 GB

You have apps using data, remove the apps, or block them from using data. Or stop using the web so much!

  • Under settings on my iPhone, does the data usage include Wi-Fi usage? Because its stating a ridiculous amount and I've had my data off… And my Wi-Fi on. Does the total of data include the amount of Internet I'm using when on Wi-Fi? I'm so confused
  • Memory Usage Problem With iPhone? I have a tethered jailbroken iPhone 4(GSM 2012), i only have 3 apps from the app store downloaded, and a few more from cydia, yet my iphone says i've used up around 6.1gb out of the 8gb i have, i can't download any apps cause of this, yet i also don't know what's taking up the space, is it the cydia sources?
  • IPhone: settings cell usage vs AT&T's data usage number? AT&T has a number, by calling it will send you a text message telling you how much usage you have used on your data. But also in the iPhone there's a cellular usage count in the settings app which also tells how much data you have used. Both of my cellular usage counts are different. Which is right?
  • IPhone 5 data usage. How much data will I need for certain apps? If I'm sending around 15-20 tweets a day, refreshing my twitter feed frequently about once every 10-15 mins & refreshing an Instagram feed around once an hour will 250MB's data be enough for a month? I won't be posting any photo's on Instagram or Twitter when I'm away from Wi-Fi. I'll also be receiving about about 10 emails a day without attachments?