Mobile phones are changing the way that people communicate. Britons now send a billion texts each month, but the popularity of the SMS text messaging service took phone manufacturers by surprise.
As sales of mobile phones begin to drop off, manufacturers are hoping that a new generation of handset - which can take and send digital photographs - might give the industry a boost, and become the next big craze among young people.
BBC technology correspondent Rory Cellan-Jones investigates whether "picture-texting" is likely to take off.
Originally broadcast 23 November, 2001.
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