HTC pure, smartphone data required with purchase?

[Casey]

im thinking about buying this phone, but it says smartphone data is required with purchase. what is that? is it like a sim card/memory card? and is it expensive?
is it absolutely mandatory to buy the internet service with it, or can you just cancel it once you've got the plan?

[thatgirl33]

no its the internet for the phone and its 30 dollars a month, yes i think you can take it off after a month I did it about a year ago but if you get the i phone you can't take it off but you can with the other smartphones.