How to I turn all the Internet off on my iPhone 4?

I'm going in holiday to Spain and don't want all the data charges do how do I ensure this?

If i'm not wrong, if you put it on plane mode all the connections are shut down but the Wi-Fi.

Settings > wi-fi > (turn off) AND settings > general > network > enable 3G (turn off) > cellular data (turn off) > data roaming (turn off)

Have nice holiday!

By turning off the phone

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