Hello! @BobBess
Thanks for posting your data questions.
Typically if you are in an LTE area you should not have any problems streaming video. You can visit us at http://www.att.com/att/datacalculator/ to get estimates on data usage depending on your needs. If you plan to watch 4-6 hours of streaming video, it averages at about 1.50 GB on standard definition and 5.24 GB on HD per day.
Hope this helps!
Charise