Dail One is a mobile application for Android and other smartphones, offering VoIP Calls from data enabled mobile phones (2G/3G/4G or WiFi) to any landline or mobile devices around the world. Features: VoIP Calls via Wi-Fi, 2G / 3G / 4G. Works in all Countries and all Networks across firewalls. Smooth voice quality. Echo cancellation. Uses very less bandwidth.