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I rarely text back, I call. Having said that, when someone calls and I can't answer, and they leave no voice message, I never call back. Ever.

I figure, if it was important they would have left a message, or sent a text so if they do not I just forget about it. My phone is for my convenience, not theirs.

To be fair, usually they are driving, so they can't really text me back and I think that is why they call. I just don't handle phone conversations well.

That's why I call rather than text.