if he is using 25gb a week, whatever he is doing is probably violating ToS for AT&T as well as any ISP..
Wired connection?
AKA Cable or DSL..
I have 150gb a month usage I use 100-140gb a month regularly. Im not violating anything you tool.
Torrents + Streaming + Online gaming + Program downloads
Perfectly reasonable, don't know what your issue is.