Warchalking, the technique of highlighting areas where wireless networks can be accessed freely, has been blasted as theft. And the practitioners of warchalking are being slammed as bandwidth thieves in an advisory issued by mobile and wireless vendor Nokia.

Over the last few months, geeks have been drawing chalk symbols on walls and pavements in cities to mark points where signals from nearby office wireless networks can be tapped into to access the internet.

The initial hysteria was over security, when it emerged that warchalkers may also be freely browsing corporate networks and accessing private company information. Now Nokia has raised the stakes.

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