This is what we were up in arms about when AT&T said they will be warning, then throttling the "top 5%" of high data users. It's a floating number, not a hard one. AT&T can claim that most people in your area are only using, oh lets say 1GB of data. It's a flawed curve.
It just happened to me. I got a text warning me that I am one of the top 5% of data users. I checked the myAT&T app, and even online, and it says I used 1.5 GB of Unlimited. So why did I get warned?
I pay $30 a month for the unlimited plan I was grandfathered in since I bought the iPhone 3GS on launch day. I even "re-upped" by contract when I heard I can keep the same plan when I bought the iPhone 4 on launch day. And now they are changing the terms?
That's not the only issue I have. The other is that I'm paying $30 a month and getting warned at usage that is 500 MB below what a 2 GB capped plan costs ($25 a month). Why? That doesn't make any sense!
I called their customer service rep, and while she was friendly, all she can do is appologize and informed me it was a flawed system. She said it was set at corporate, and she cannot do anything about it. I understand the situation, and appearently, I wasn't the only person who called. As she put it, she "tries to be honest and notblow smoke". I guess you can get some honest reaction when you're super nice to them. However, it didn't solve my issue.
I always figured a reasonable self-imposed cap would be 5 GB, which was the unspoken limit when AT&T didn't have any asterisks on their "Unlimited" data plan. Even so, I try to keep around 3-4 GB of use, which is what I expect paying the extra $5 a month should afford me.
Anyone else getting warned below or at the 2 GB mark? Hit me back here in the comments section.