How much data will a BBM voice call use?

I have the BBM app on my iPhone, and just noticed it has a voice call feature. I understand it uses Internet data rather than calls (minutes), but how much data is it likely to use (e.g. Per minute)?

It varies too much to give a proper answer. Could also depend on the connection you are on at the time. If at all possible, try using it on Wi-Fi. Assuming that it would show how much it would use during the call to get an idea of the how much.

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