Necessary add ons?

I want to transfer my already existing plan to a blackberry that my husband use to use. It is older though and was wondering if I need to use the blackberry data add ons. Your brochure says it's available for the curve and bold smartphones only. My phone is a pearl 8100. The lady at Walmart told me I had to have it, does anyone know for sure? What is the benefit of having it anyway?
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