I found some stories in a web (http://mobile.aol.com/gallery/strange-c ... ries/page4) and here's one of them:
$85,000 Cell Phone Bill
No joke: A Canadian man was hit with an $85,000 cell phone bill after buying a new phone and what he thought was a $10 unlimited data plan. While Piotr Staniaszek imagined that tethering the phone to his laptop and downloading to his hearts delight was kosher, wireless carrier Bell Mobility had other ideas.
The service provider informed the oil worker that using the phone as a modem was not covered under his plan, and it proceeded to charge him on a per-kilobyte basis. As a token of "goodwill," the company eventually lowered the bill to only $3,243. Something tells us Staniaszek wasn't impressed by the evil corporate reduction.