First post but this topic is right up my street. The national telephone company is Australia wont allow mobiles to be switched on in their call centres as headset users have actually lost eardrums and had permanent damage to their sense of balance due to high pitched tones from the network. These tones are possibly generated by interference from mobiles and if you are in an industry which wears headphones (as you are) you should be very wary of people using mobiles in your vicinity. Imagine spending all the money and time achieving your enviable career only to have it destroyed by someones mobile phone screwing up your sense of balance. It can happen one of my colleagues has to walk up six flights of steps every day because she can't even stand riding in a lift and actually has to be sedated to go on holiday in a plane.
Edited for spelling mistakes
[ 05 November 2001: Message edited by: gunner b 1 2 ]