their coverage is limited,and if you register your handset within a certain area code you cant use it outside of that
area eg if you live in johannesburg you cant use the handset/s in pretoria or any where else where the telkom prefix is not 011,but you can still call any number outside your area code.the quality of the calls depends on the signal strength in your area.im not sure how their technology works or which towers they use.their service is not as reliable as any of the cellphone operators or telkom due to limited coverage.sometimes the calls do break up,so i would compare the service to voip in terms of quality and reliability.also people on the other end of the line say that a neotel user sounds a bit soft or far away at times.