Why is my data usage so high?

So I recently got an iPhone 4, I've only had it for at least 3 weeks. My mom got a message tuesday saying that I used 65% of my data. (we share a plan, 300mb in data.) the only apps I used were instagram, gifboom, pandora, twitter, matching w friends & temple run. After getting that message, I deleted all of the apps except temple run, pandora, & twitter. This morning I got message saying I used 90% of my data! I deleted twitter this morning as well. My friend told me that on at&t you have to use Wi-Fi for apps like twitter & instagram. What is going on! & my other question… I'm not suppose to have a twitter. So if I go up to the at&t store, will they be able to see the apps that I've downloaded?

The reason why it got so high, so fast, is because both of you are using it, and when you're loading a website with a lot of pictures, it blows your data through the roof.
Pandora, or anything large, will do that.
I personally hate data limits.

I think pandora uses a LOT of data, so that might be it.

You have twitter so it is probably that readon

  • Why is the data usage on my iPhone so high? I can't figure out what I'm doing that is causing it to be so high. I've compared to family members who seem to use the same if not more than I do. I frequently make sure I have Wi-Fi on hoping this'll reduce it?
  • Why is my email usage so high on my iPhone 4? My iPhone email is using a LOT of my data. For example, I just switched to T-Mobile and after 1 day my usage is 120 MB with 106 of that being mail. I even have it set to not load images automatically and it is still very high. Any ideas? I do have 4 email accounts on it. WIth about 2 hours left in the day I've gotten 55 emails today.
  • Why is my data usage so high after switching to At&T? When I had my iPhone 4 with Verizon, I used roughly 300MB of data per month. I recently upgraded to the iPhone 5 and switched to AT&T. Yesterday, at the end of the FIRST DAY of the billing cycle, I checked my data usage --- 500MB! I was barely on the phone at all yesterday. I probably checked Facebook 3-4 times and refreshed my twitter feed a couple times as well. I get about 50 e-mails per day. Can anyone tell me why this is happening?
  • 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