theodp writes "What would you say if you went to join a gym and were told that it could cost you anywhere from $360 a year to $68,000 a year for the exact same usage? Don't be ridiculous, right? Well, that's really not so different from what the potential costs of streaming video on an AT&T smartphone are. According to AT&T's Data Usage Calculator, 1,440 minutes worth of streaming video consumes 2.81GB, which — if you manage to keep Netflix fired up all day and night — would result in a $360 annual bill under the grandfathered $30-monthly-unlimited-data plan, or $68,376 under the new $20-monthly-300MB plan. Still, that didn't stop a spokesman from characterizing the new AT&T data plans as 'a great value' for customers."