AT&T to throttle data speeds of tablet users with a grandfathered unlimited plan18
Essentially, this means that AT&T's tablet users with a grandfathered unlimited plan have the same restrictions as do those with a new smartphone unlimited plan. The nation's second largest carrier starting offering unlimited service in February, and those subscribers are also open to having their data speeds throttled if they use more than 22GB of data during their billing month.
AT&T got the go ahead to throttle grandfathered unlimited accounts when a lawsuit filed against the carrier by the FTC in 2014 was dismissed last year. The FTC charged AT&T with using deceptive practices by not revealing to its customers that they would be open to having their data speeds reduced sharply if they went over a certain data cap.
AT&T started offering unlimited data for tablets back in 2010, following the launch of the Apple iPad. Eventually, AT&T put a data cap in place, but allowed those with unlimited plans to keep them as long as they paid for the service each month. As it turns out, grandfathered unlimited service is costing these tablet owners $29.99 a month for service.