Data plan for non-smartphone?

Hi, I have an AT&T account in California. My phone is a non-smart handset. I have a smartphone I purchased somewhere other than AT&T & want to get a data plan. When I go to "Manage Features" on the AT&T website, my only options for data plans are for non-smartphones. What does this mean? If I pay for unlimited data for non-smartphone, then use it on a Nokia C6-01, what action is AT&T likely to take? Thanks

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If AT&T Mobility determines that your replacement phone qualifies as a smartphone, you will be placed on the DataPro Data Plan which allows two gigabytes of data for $25.00. If AT&T Mobility does not classify your phone as a smartphone, they will leave your current data plan in place.