IVOISS for iPhone. This software will allow you to make free calls (also Video Calls) and sms to other IVOISS users (PC and Smartphones) and will also allow you to make very cheap calls and sms to users of other networks worldwide, Works with WI-FI, 4G, 3G, EDGE and GPRS and GSM, IVOISSS very competitive international rates, will make you save up to 80% in your calls.