You can try our mVoip app made by Y Union Korea Co.,Ltd. The brief features of Y ANGEL PHONE are as follows.
▶ Push Notification for incoming calls for improved battery life.
▶ Support for usage on WiFi, 3G and 4G networks
▶ Background support with status bar notification, check your e-mail or other tasks while still available for calls on the Y ANGEL PHONE
▶ Call recorder and player, seamlessly integrated into the call history
▶ Bluetooth headset support
▶ Support video calls between users
▶ Support audio codec Lists : G.729, G.722, G.711 u, G.729 a, Opus Wideband, Opus Narrowband, iLBC
▶ Support audio codec Lists : VP8, H263, H264