Does TM Video calling default to using wifi?  Is there an advantage over using Duo?

miket

       Since TM's video calling is limited to calling other TM numbers, we have used the Duo app for the a few video calls we make.  (Most people we video call are on TM.)   Does TM video calling default to using Wi-Fi when available or are calls routed  via TM so that the calls burn up data?

       What would be the advantage of using TM video calling over DUO?

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