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IT LOOKS like any other mobile phone. And you would probably be delighted to be given one. What you would not realise, however, is that it is not quite what it seems. Most of the time it operates exactly like any other handset. But just one call from a particular number and it can be switched on without your knowledge, with no outward sign that it is operating. Everything you say will be captured and sent across the network to the eavesdropper, yet you will have no idea that anyone is listening in.

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