To use this service, one will first have to create an account on Nimbuzz, which will enable them to use the Spectranet hello ip dialer for international calling by buying calling credit through credit card. This service will actually work like the way Skype calling cards work for making international calls.
Spectranet hello ip is only an outbound calling service and thus this service will not support domestic calling within India.
The service will work with all data networks and Wi-Fi. The company also says to have set up 24×7 call and email support to assist users.