any update on GSM interference issue

[arne anka]

> The ferrite is increasing the common mode inductance of the cable  
> because the
> ferrite has a better magnetic permeability than air. Taping the ferrite  
> to
> the cable is a bit like a half turn on a ferrite rod. It will still  
> affect
> the inductance, but not as much as if it went through a ferrite ring.

anything to pay attention to in particular (size, color,  taste or smell  
;-) or just using one that fits?