any update on GSM interference issue

[arne anka]

> http://gadgets.boingboing.net/2008/08/02/kill-gsm-radio-buzz.html
> Maybe that could provide a less invasive means to getting rid of the  
> problem?

jOERG proposed using a ferrite bead on the wired headset a while ago in a  
german forum (freeyourphone.de or so).
i am still trying to find one which is capable to be put on the included  
headset non-destructive (both the bead and the headset).

ps: i was still under impression, the bead has to fit _around_ the cable  
-- the page says, it can be attached simple with tape as well.
has someone a link explaining exactly what kind of voodoo that thing does?  
has it to have a hole?