No cord, no difficulties
For a long time a headset for different mobile devices was “attached” to the phone by means of a “cord”. Thus it caused some difficulties when talking over the phone while going in for sport, working or driving… At the very beginning of the XXI century there appeared an opportunity to get rid of these ever meddling cords – the new wireless technology Bluetooth was created. For mobile communication this was marked by the fact that it was no more necessary to hold a handset, instead handy headsets made it possible to walk off a signal source up to 10 meters and more. Bluetooth was the first universal wireless technology for telecommunication that used radiowaves of a short range and that replaced a wire for connection between mobile devices. The pluses and minuses of Bluetooth headsets are described at cell phone news site.