Modern warafer 2 online gaming question?

Ok i play mw2 on my ps3 online on brodband and my isp is vodafone. I have a brodband plan on 5 gb per month now i was wondering that when i play mw2 online i suppose it doesnt use up my gb because i am not uploading or downloading anything i'm just connecting to thier servers and playing the game online or am i wrong and does it still use internet?
 
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