Verizon Old Droid Phone?

I have the Verizon LG Decoy, currently I do not have the Unlimited Data Plan, my friend got a new phone for Christmas and he gave me his old one, his old one was the old Droid, If I were to switch to the Droid would I have to buy the data package, I know that I don't need the data package to call people so why do I need it?
 
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