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Mobile calls and texts made on any GSM network can be eavesdropped upon using four cheap phones and open source software, say security researchers.
"Now there's a path from your telephone number to me finding you and listening to your calls," Mr Nohl told BBC News. "The whole way."
He said many of the pieces in the eavesdropping toolkit already existed thanks to work by other security researchers but there was one part the pair had to create themselves.
"The one piece that completed the chain was the ability to record data off the air," he said.