I have a samsung blackjack 2 with out a data plan. i want to get a data plan but i want to know wut i should get. i looked on there website and i saw a unlimited data plan for 15 bucks a month. but then i looked and it said the phone wasnt compatible with this service so i looked under smartphone data plans and its 30 bucks so i just wanted to know if i could use the 15 doller one with my phone thanks for the help.