How to turn off data for Iphone 4S?

So, I'm going overseas and I want to bring my Iphone but I don't want to get charged for using it. Is there a setting I can set to turn off my data or cellular data so that I don't get charged for using my phone overseas?

Go to >settings>general>cellular>cellular data to off. There you go! If you need to turn it back on do the same thing and turn it back to on. However, make sure you have airplane mode on if you don't want to be charged for international calling either. Keep airplane mode on the entire time your there if you don't want to be charged any fees.

Phone your provider and ask them to disable cellular data on your number. Or go and do it in the settings on your 4S