D4U

D4U là một ứng dụng di động cho các cuộc gọi VoIP Android cung cấp.

D4U 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.

For End Users:

You will be prompted for the following while starting the app:

1. User Name – User name is provided to end user by VoIP service Provider.

2. Password – Password is provided to end user by VoIP service Provider.