Google nexus s question?

[Nick Goli]

I have a google nexus s and I was wondering how to lower my bill I'm with wind on a super smart plan and I really what to know what data roaming is, I know the basic concept about data roaming but what I what to know is in settings there is a box for data roaming will I get charged if my data roaming is on or off. Please don't give the wrong answer I really have a low budget and I can't afford to be charged. I'm only 13 I don't get much money. Thanks in advanced