I just bought a Samsung Gravity T phone from Ebay....?

I have a plan with T-Mobile and was planning on just popping my sim card in and start using the Gravity T right away. But, my friend told me I would have to pay a $30/month data fee for the phone to even work. Will I have to pay $30/month or will can I just use my sim card and start using my new phone right away?
 
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