How to use my iphone in Mexico with out extra charges?

I'm going to spend a day in Mexico next week, how can I keep any calls or messages coming in so that I won't get charged? I would still like to use Wi-Fi if it is available somewhere. Is this possible? I tried it on airplane mode at my house (where there's Wi-Fi) and I wasn't able to go on the Internet. So is there any way I can do that or will I just not use Internet on my Iphone?

Free txt and call app

Mug a Mexican and use his

I have a friend in canada.
i spent a day there to visit him and used a text messaging/call app to contact family in the US and my grandma who was in mexico for a couple months.
phone bill came and no extra charges.

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