A lot of people today have shifted their interest from using their cellular service calling to VoIP calling services. If you are also one of those who wish to save their green over the bills, it’s time to ditch the cellular calling. Using VoIP app for making calls is what needs to be done now. Using VoIP is not a difficult thing, especially when we have smartphones today. The services are either low-cost or free, depending on the VoIP app and its features. However, there comes a hurdle when one may want a VoIP app for their smartphone, but it is not available on their smartphone’s operating system.