VoxEra lets its customers to use their sim cards worldwide for sending and receiving calls/SMS without any roaming fees. User just needs to put the SiM card inside the device, connect it to Internet and leave it at his home country. VoxEra app. connects user to his home SIM. Unlike all applications VoxEra is not an app to app, as only VoxEra customer uses the app., for all others its simple GSM call.