Sp plus is amobile application, which allows users to make VoIP calls from mobile phones. For using this app, end users will need an Operator Code, which they can obtain from VoIP Service Provider.
Integration with mobile phonebook
Balance information: You can check their account balance on the mobile phone screen or alternatively, they can hear account balance information through IVR (Interactive Voice Response).
Grape Dialer Plus supports 3G/4G, and Wi-Fi for internet connectivity.