How to use Wi-Fi only on my iPone 4S?

I'm travelling our of my country and i want to bring my iPhone for music and Wi-Fi access.
I don't want to get charged for roaming by recieving calls/texts/data.
How can i do that? How do i set my phone to be able to use Wi-Fi and not cellular stuff?
Also, would i still be able to use iMessage without being charged?

Turn on Airplane mode. And just turn Wi-Fi on. That should work!

Go to settings and turn on Airplane Mode first. Once it's on turn on Wi-Fi and you will be good to go. You will also be able to use iMessage (be able to text message other iPhone users) and FaceTime as long as you have Wi-Fi with no charges.

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