A BlackBerry data plan is required to get all the data functionality of the BlackBerry. There are some features (for example, BlackBerry Messenger) that will only work if you have a BlackBerry data plan, that will include all the required configurations (service books) to get your BlackBerry to have all its features activated.
I can't tell you what your data plan will cost, I guess you could just go in and ask them to tell you the data plans that they have for the BlackBerry, and then you can decide which one fits your budget (if you have a choice)
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