How to turn off 3g on iphone5?

I have an iphone 5. And i'm at the airport going to vegas but i do not want to get charged while i'm over there i just want to use Wi-Fi. So how to i turn off 3g so i will not get charged?

You are not charged for this feature-it's free with iphone5s.

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You aren't charged for 3G but you are best to turn your data roaming off If it's on while travelling. Go to settings - mobile and ensure data roaming is off

Once you connect to Wi-Fi, your data connection cuts out in favor of the wireless network you connect to.

Go to setting to find it

Make sure Cellular Data is turned off. That will ensure data won't be used while you are there. When you're ready to turn it back on, turn on Cellular Data.
Then, connect to a Wi-Fi access point at your own will.