Used blackberry being put on my Sprint $29.99 a month plan?

I have a sprint plan that is $29.99 a month. My mom, who had the same plan as me, bought a blackberry and her plan increased to $59.99 a month. My friend has a new blackberry that she no longer likes and offered it to me. If i put the blackberry on my plan, will it work? Will i have to increase the price of my plan like my mom?

Any information helps. Thanks :)
i do have internet. it is some sort of discounted plan called the sero 500 plan. it gives me 500 minutes and unlimited internet and texting. would i still need to get one of those plans that you suggested?
 
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