Using Iphone 4S on a Blackberry 9900 Plan?

[wireless]

Hi all, I know this question has been asked many times but I can't seem to find the answer. I am currently using a blackberry Bold 9900 on a $40 plan that includes social networking, txting, minutes, and bbm. My question is if I were to get a Iphone 4s from a friend who's on the Bell network, and I...

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