Travelling with iPhone. How not to have huuuuge bill.

[FumblesandFrolics]

I know there is a way, I just know it. But I can't remember what it is I have to turn on/off so I don't arrive home to a huge bill for 3G data. Will occasionally have access to wifi though.

Can someone point me to the right button (if that is the term?)

Settings-> General -> Network

and make sure that the 'data roaming' slider is set to OFF (By default it is)