Researchers Hack GSM phones.

Researchers have shown a simple technique for eavesdropping on individual GSM mobile calls without the need to use expensive, specialized equipment. This kind of GSM snooping has been possible for a long time, but it’s always been very expensive.
During a session at the Chaos Computer Club Congress (CCC) in Berlin, Karsten Nohl and Sylvain Munaut used cheap Motorola handsets running a replacement firmware based on open source code to intercept data coming from a network base station.