海外旅行中のローカルレートでのグローバル呼び出しは、連絡を取り合います！
Ringbery Dialer is a mobile app for Android and other smartphones, offering high quality VoIP Calls, from data enabled mobile phones (3G/4G or WiFi).
For using this app, end users will need an SIP account, which they can obtain from a Ringbery.
Features:
VoIP Calls Wifi, 3G / 4G, edge or UMTS.
Free calls between Ringbery users
Works in all Countries and all Networks across firewalls.
Smooth voice quality
Echo cancellation
Uses very less bandwidth.