[samos]

Can anyone help me.
I have a Blackberrry Torch, and visiting the US from Canada and have a ATT SIM card and am on a "GoPhone" account ... meaning for $2 a day i get unlimited phone calls within the US. (I have no data plan)
But when I check my account online I am getting charged seven or eight cents several times a day for something called GPRS .. its only seven or eight cents each time, but I dont know why its happening at all.
What is GPRS ... why am I being charged?

Is it anything to do with Wi_fi? I thought being in Wi-fi range meant there was no charge for anything?

Hope someone can clear up this confusion for me. ATT wasnt much help.
thanks