Problems with 4G data usage?

On my iPhone I have 2000 MG of data. I checked to see how much data I have yesterday and it said I had 1331 MG. So I went on YouTube on my 4G for like a minute and all of a sudden I get a text saying I've used up all my data. This morning I checked my data usage and it says I'm up to 1839. Did AT&T mess up with sending that text or? Cause it says I still have data left. I'm so confused.

Dunno call customer care

  • 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?
  • 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.
  • 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
  • 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?