Can iPhone Apps use data even if you aren't actually useing them ?

I have an iPhone 3GS, and the reason why I'm asking this question is because i have the lowest amount of data(3G) you can buy, which isn't alot, beacuse I dont use the internet that much. But for some reason my data gets useds without me knowing. Is it possible for some of the apps on my phone to use data without my knowledge ?

I believe not, apple just recently announced at their latest press conference (july 6th was it?) that the mac will have in app purchases, which would require the use of the internet. However if the game has online capabiliteis to compare scores and go online (apple games center), that can use data, but should only start once you activate it.
The only way is for you to have updated your apps which I believe is done manually by default.  What I recommend you do, is that you turn off your internet (not wifi, but from your carrier) to prevent overuse.

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