Need Help with MMS and Internet on KP500 Cookie (NY)

If someone could please help....i recently purchased an unlocked phone from Ebay the LG KP500. I am located in Syracuse NY. Although AT&T makes no promises as to the ability of phones to accept and send MMS messages or connection to the internet, i was hoping someone may have previous experience with this phone in the USA who IS able to figure it out. Please help, not tech saavy so small steps will be helpful.

Thank You everyone!

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Do you have AT&T Cingular? What state, country?