att wireless service question?

i am wanting to switch to att from verizon and i want to get a blackberry and i wanted to know how much the data plans are.. i know the ulimited ones are 30 but i just saw on tv that there is ones for 15.. i was wondering if u could also have no data plan and once you send in your rebates for the phoens and call and cancell the data plan service if the phone will still work.. if you could help me out that would be great
 
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