Millions of Sim cards are 'vulnerable to hack attack'
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.
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