AT&T Smart Limits - beware.

One thing to know if you use, or plan to use AT&T's Smart Limits to clamp data usage on the iPhone is that the "Web Browsing" limit means just *web browsing*. I called them when one of my devices sailed through the "limit" I set. AT&T support told me that while this "sounds weird" they have no way of limiting the data usage of the device beyond bowser usage.

Activities like following links from texts, or moving data via apps will still be allowed and will accumulate the devices's data total for the billing period. After tracing the times of data use and the direction it went it looks like the Facebook app was most responsible for putting my kid through his data allotment.

While they were quick to point out, repeatedly, that WI-FI is not counted - this service is a false sense of security for this function. In the long run it would be best to teach whomever the user is to monitor their usage and manually turn it off when they are approaching the limit - or just got to he next higher data plan.