Promax can register and make VOIP calls through this app is a mobile app for Android and other smartphones, offering a range of functionalities like VoIP Calls from data enabled mobile phones (3G/4G or WiFi). For using this app, end users will need an Operator Code, which they can obtain from a VoIP Service Provider. ★VoIP Calls & SMSs via Wifi, 3G / 4G, edge or UMTS. ★Easy Sign Up with Mobile Number as user ID & automatic Buddy List creation with facility to invite phonebook contacts to inst