BBC News - Hackers crack open mobile network: "Mobile calls and texts made on any GSM network can be eavesdropped upon using four cheap phones and open source software, say security researchers.

Karsten Nohl and Sylvain Munaut demonstrated their eavesdropping toolkit at the Chaos Computer Club Congress (CCC) in Berlin.

The work builds on earlier research that has found holes in many parts of the most widely used mobile technology.

The pair spent a year putting together the parts of the eavesdropping toolkit.

'Now there's a path from your telephone number to me finding you and listening to your calls,' Mr Nohl told BBC News"

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