What is a good app to use to text for free internationally for the IPhone?

I'm going to Mexico in a week and I want to be able to communicate (text, calls) with family in the US while i'm there. What is a good app to download for an Iphone that would be completely free for me and the other person?

If the people you are trying to communicate with are smartphone users too, I'd say whatsapp is your best bet. If you're trying to text from a number instead then get Pinger Text Free. They give you a free number and the other person does not need to have the same app or even a smartphone. They both work on Wi-Fi so no need for a data plan. That's as far as texting options, they allow for calls too but I've never tried them. An excellent app to make free phone calls is iCall, sound quality is good and there no charges whatsoever. Bad thing is I think the limit per call is 5 minutes since they're free and the other person receives the call from a weird number, they might not recognize it's you.

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