Alright so i want to get the droid, and im wondering if this will work. Im 16 and on a family plan, i do not have data for my dare. Buuuuuut, i can pay the $30 a month for the data, how much will it cost me if i get it around christmas, it would be one year at that point, and can i do that? Add a data package to one line in a family plan? Thank you in advance!