unlocked blackberry storm problems please help me people!?

I purchased an unlocked verizon blackberry storm from craiglist, to use with my current ATT services. Upon buying it I noticed that all worked well except for the blackberry internet and I couldnt set up the email through blackberry as it said I didnt have service. I looked in the mobile connections and the person I bought it made it possible to surf the web through att regular internet. But it runs slow because the blackberry internet service. The guy I bought it from told me to activate a smartphone plan to the blackberry and it should work.. but before adding a 25 a dollar a month plan to my phone I need to know if this will even work.. What im trying to say is....HELP REALLY!
 
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