Straight talk data not working?

I bought a factory unlocked iphone 4s and a straight talk sim card. I put the card in, activated it, and i can call and text- but data won't work. I bought the $45/mo unlimited talk text and data

"Could not activate cellular data service - you are not subscribed to a cellular data service"

when i put the sim in i didn't change any apn settings or anything, i just went through the activation process for the sim card.

Added (1). Under settings >general > about, my carrier is specified as at&t 14.0

Contact straight talk tech support. Hopefully you didn't buy the wrong phone

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