blackjack phone service

blackjack phone question?
I recently purchased a blackjack phone from AT & T, but its 3G service is too expensive and use Active Sync to surf the Internet using my home wireless network. Is it free or do not know I can do and charge me? This worries me because if they were instructed then let me just say I'm screwed. If anyone can help me do that, appreciate it. Thanks
You will be charged for the KB download. Its usually around of a cent per KB, but can add up.
blackjack 2 unboxing/review