engadget :
Every GSM phone needs a SIM card, and you'd think such a ubiquitous standard would be immune to any hijack attempts. Evidently not, as Karsten Nohl of Security Research Labs -- who found a hole in GSM call encryption several years ago -- has uncovered a flaw that allows some SIM cards to be hacked with only a couple of text messages. By cloaking an SMS so it appears to have come from a carrier, Nohl said that in around a quarter of cases, he receives an error message back containing the necessary info to work out the SIM's digital key. With that knowledge, another text can be sent that opens it up so one can listen in on calls, send messages, make mobile purchases and steal all manner of data.
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