Video can consume LOTS of data, however youtube is mainly short video clips so you are somewhat limited that way. That being said you can still rack up loads of MBs watching those vids. Also if you also have wifi, that can help to minimize usage. I'm a heavy video user, BUT I'm on a efficient BlackBerry, and I use around 1 to 1.5 GBs a month, although I HAVE gone above that on occasion. What are your plan choices?