Big Voize is an app that uses mobile VoIP to make phone calls using internet. What can be better than this to make it cost-effective? All you need is an internet connection and an android device to connect to your friends. What makes it even more attractive is that you never have to worry about your sim balance. It is considered to be the better VoIP caller than most others because of its high quality calls. Big voizeusually works using edge/3g/4g/ WiFi connectivity. Now connect to the world with just internet and nothing more. No more recharges and top ups.