1. Is Skype allowing VOIP calls for free? Skype is the best way to make a phone call online via VOIP and it is free and can do video call too. You can use it on a window computer, Smartphone like iPhone, Window phones and Android phones. 2. Why to use VOIP service to make a phone call online? It reduces your phone bill, especially in the case of international calls and is more versatile than traditional services. 3. What type of internet connection needed for VoIP? Broadband internet connection is needed to make a phone call online.