MO-Call VoIP mode uses an available Wi-Fi internet to connect your call over the internet. In VoIP mode, you can make two kinds of calls. After minimizing the application, dial an international number and MO-Call routes the call over the internet and you pay the really low VoIP rate. You can also use VoIP mode to make absolutely FREE mobile calls. Just add other users to your buddy list and call them over the internet completely free.