A hands-free headset helps by keeping the phone away from your head.
Trouble is, the wires always get tangled up or snagged.
So the Swedish phone maker Ericsson has developed a wireless hands-free unit, which is connected to the phone via a microwave link. Though this once again places a transmitter at head level, the idea is not as crazy as it sounds as the microwave link has only one-thousandth the power of ordinary cellphone transmissions. The headset will be one of the first consumer devices operating to the new Bluetooth standard for wireless networking. Bluetooth allows gadgets such as palmtops, printers and cellphones to communicate over the air at 1 megabit per second. Bluetooth devices in the same room will not interfere with each other, as the system continually hops between 80 different channels.