Are there any free messaging apps that don't need Wi-Fi?

I'm going away in a few days and the place I'm staying has no Wi-Fi. But I've got to try and keep in contact with my best friend because she's reviving some news this week and she wants to tell it to me when she hears. I have an iPad and she has an iPhone, and she doesn't have any credit so we can't text. Are there any free messaging apps in the app store that require no Wi-Fi!

Sorry, but that's not possible. You need an internet connection or you'll have to text. Sorry, no way out.

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