GuruPlus is a great way to stay in contact with your friends & family, no matter where they are. Call your friends, family, business contacts, etc. anywhere in the world for free using GuruPlus app-to-app app to GSM feature just like you would a regular phone call over Wifi and 2G/3G/4G.
Operator code is assigned automatically to an operator when he registers with Mobile Dialer. During the registration, the service provider used to provide information like switch IP, port number, and IVR extension. And this information has been stored against the operator code. And end users will need to input operator code instead of all technical information. End users will need to input this operator code only for the first run of dialer.