Manhattan, New York City, USA: A businesswoman with short dark hair, talking on a mobile phone while walking along a busy sidewalk.

A businessman with grey hair talking on a mobile phone in Manhattan, New York City, USA.

London, England. Sequence showing various traders dressed in brightly-coloured jackets communicating with one another through hand signals ('open outcry') in the busy trading floor of the London International Financial Futures and Options Exchange (LIFFE). One male trader celebrates an achievement by throwing his hands up and punching the air.

Manhattan, New York City, USA: Feet of an unidentifiable businessman carrying a briefcase and umbrella while walking along a sidewalk.

Manhattan, New York City, USA: An unidentifiable businessman using a Blackberry handset.

Manhattan, New York City, USA: A man in a baseball cap and raincoat talking on a mobile phone while walking along a busy street.

Manhattan, New York City, USA: A businessman carrying a laptop computer shoulder case talking on a mobile phone while crossing a busy road.

Medium view of a male trader pointing at a computer screen in a busy stock trading office in London, England. Zoom out to a wide shot showing other traders talking on phones and working at computer terminals.

Manhattan, New York City, USA: Tracking shot following an unidentifiable man talking on a mobile phone while walking along a busy street carrying a backpack.

Two businessmen dressed in raincoats using mobile phones while standing on a busy street in Manhattan, New York City, USA. Crowds of pedestrians pass by in the background.

Manhattan, New York City, USA: A tall, bald-headed, well-dressed businessman wearing a suit, yellow tie and sunglasses talks on a mobile phone while walking along a busy sidewalk.

Hands of an unidentifiable man holding a Blackberry handset while he walks along a busy street in Manhattan, New York City, USA.

Manhattan, New York City, USA: Two businessmen talking on mobile phones. One man wears glasses.

Brightly-lit internet caf�ƒ© with people typing away at computer terminals. People sitting in rows, many wearing winter jackets. London, England.

An unidentifiable businessman dressed in a blue shirt using a Blackberry handset while walking along a busy street in Manhattan, New York City, USA.

A businessman wearing a raincoat using a mobile phone while standing on a busy street in Manhattan, New York City, USA.

An unidentifiable businessman using a Blackberry handset as a mobile phone on a busy street in Manhattan, New York City, USA.

Close-up view of a frustrated-looking, unidentifiable male trader speaking on the telephone in a busy stock trading office in London, England. Zoom out to a wide shot showing other traders working at computer terminals.

London, England. The busy trading floor of the London International Financial Futures and Options Exchange (LIFFE) prior to it becoming Euronext.liffe. Crowds of traders wearing brightly-coloured jackets shout and gesticulate to one another.

London, England. Unidentifiable male office worker in a blue shirt speaking on telephone in a modern office environment. He sits leaning back on his chair and strokes his own hair in a relaxed manner.

Moving shot of camera screen on mobile phone held up to camera as it is carried along through park, camera screen shows trees in park

A man wearing a leather jacket dialling a number on a mobile phone and putting it to his ear as he walks along a busy street in Manhattan, New York City, USA.

A trader passes a message to a colleague speaking on the telephone in the busy trading room of the London Metal Exchange in London, England.

Pan across the busy trading room of the London Metal Exchange in London, England. Traders shout and gesticulate frantically ('open outcry') at one another.

Manhattan, New York City, USA. Close-up of a holstered mobile phone attached to the back of an unidentifiable businessman's suit trousers.

Manhattan, New York City, USA. Close-up of the hands of an unidentifiable businessman as he types keys on a Blackberry handset to send an email.

Low angle view of a trader speaking on a telephone on the trading floor of the American Stock Exchange in New York City, USA.

Manhattan, New York City, USA: An unidentifiable businessman walking while talking on a mobile phone.

Manhattan, New York City, USA: Hands of an unidentifiable woman typing a text message into a mobile phone.

London, England. Sequence showing various traders dressed in brightly-coloured jackets communicating with one another through frantic and sometimes aggressive hand signals ('open outcry') in the busy trading floor of the London International Financial Futures and Options Exchange (LIFFE).

Close view looking down at male hand using thumb to text message on silver mobile camera phone against green grass background

An unidentifiable businessman wearing a suit and a red tie walking along a busy street in Manhattan, New York City, USA. The man types keys on a Blackberry handset to send an email while walking.

London, England. Sequence showing various traders dressed in brightly-coloured jackets communicating with one another through frantic and sometimes aggressive hand signals ('open outcry') in the busy trading floor of the London International Financial Futures and Options Exchange (LIFFE).

Manhattan, New York City, USA: A well-dressed businessman talks on a mobile phone while entering a parked taxi.

London, England. Sequence showing various traders dressed in brightly-coloured jackets communicating with one another through hand signals ('open outcry') in the busy trading floor of the London International Financial Futures and Options Exchange (LIFFE) prior to it becoming Euronext.liffe.

Sequence showing various male and female traders communicating through hand signals ('open outcry') in the busy trading room of the London Metal Exchange in London, England.

Manhattan, New York City, USA: Tracking shot following a businessman walking along a busy street while talking on a mobile phone.

Manhattan, New York City, USA: Two businessmen dressed in suits, one young, one older, talking on mobile phones while crossing a busy street. The younger man also carries a Blackberry handset.

Manhattan, New York City, USA: Close-up of an unidentifiable businessman wearing a Bluetooth mobile phone headset over his ear.