iMessage and FaceTime question


Do you get charged for using iMessage or FaceTime? More specifically, I'm in the US and my boyfriend is in the UK. Will our texting bill go through the roof or are these things actually totally free, internationally as well as in the US? Everything I've read online said that iMessage takes up data, NOT actual texting. And FaceTime is all through wifi right? So that's free as well?

Thank you!!

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