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A flaw with mobile phones' Sim card technology is putting millions of people at risk of being spied on and robbed, according to a leading security expert.
Karsten Nohl has said he has found a way to discover some Sims' digital keys by sending them a special text message.
He warned criminals could potentially use the technique to listen in on calls or steal cash.
Industry organisation - the GSMA - said it was looking into the findings.
"Karsten's early disclosure to the GSMA has given us an opportunity for preliminary analysis," said a spokeswoman for the association, which represents global network operators,Report: SIM Cards Vulnerable to Hacking [bbc.co.uk]
"It would appear that a minority of Sims produced against older standards could be vulnerable."