The claim, if true, could pose a threat to many wireless carriers who have used essentially the same security on their networks for years, The Wall Streel Journal reported.

The hacker, Karsten Nohl said in Bangalore on Wednesday that he and a small team broke the encryption code for networks on GSM technology, which makes up more than 80 per cent of the world's cellular networks, to show how vulnerable they are and to make carriers more serious about security.

The hacker is expected to demonstrate Wednesday.

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