hello,
a friend pointed me to this news:
"Hackers crack Vodafone's network, can listen to all calls" http://www.tecca.com/news/2011/07/13/hackers-crack-vodafones-network-can-lis...
so I jumped to the THC blog: http://thcorg.blogspot.com/2011/07/vodafone-hacked-root-password-published.h...
and THC wiki with more information about the FemtoMod, protocolls and so on: http://wiki.thc.org/vodafone
have fun :)