I have just experienced the same problem with My AT&T Bill as Jogston.
Exactly 1.5 years after switching to AT&T and this month the data usage
has suddenly exploded and I am now over my limit and being charged 20 bucks
for additional mb's. In all the previous months I had not had any usage shown
for INT/MD. Methings AT&T is gouging the customers. What I did do to curtail
ANY auto usage of data is went to my phone and disabled the various functions
under connections, data usage, function (various) to prevent updating of Mobile
data UNLESS by use of my (or any other) WI-FI connection.