What's the limit? Have any of you ever been warned for going over the limit? What did AT&T say, etc...? I'm in East Central Illinois and half of the time I'm roaming on Cellular One's network because AT&T have bad coverage in small towns here. I used about 50mb of data (roaming) the first day I got it, now I'm using quite a bit less, but I'm still a bit worried about what AT&T will say about it.