I just got the blackberry pearl with AT&T. I always had the unlimited messaging plan for 20$ extra a month. Well, now in order to set up my e-mail I heard I have to get the Blackberry servise... I heard it's 30$ a month. What all does it include? Does text messaging come with that 30$ a month? Because if so, I already pay 20$ a month for that.

Please answer with best detail as possible. I'm not that good with cell phones.