Why is my BBM not working on my Blackberry?

Faith

New member
Almost a month ago, i got a phone from AT&T with unlimited web. it wasn't a smart phone. Now i changed the sim card and put it in my BB(blackberry). from that day everything but email and bbm work. twitter.. web... all work. i know that when switching the normal phone's unlimited to BB i only get 200 mb a month, and i was told to come back in 35 days for them to change the web for BB. but i'm just wondering how come?
 
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