You want a phone that can do it all? Internet, music, photos, films, documents, texting, instant messaging, diary, contacts and ... err ... phone calls?

Then a smartphone is right for you. But as the market for high-end mobiles gets ever more crowded, which should you pick?

The global market leader, Symbian, makes the software that runs most of Nokia's smart phones (and a few others).

Research in Motion with its e-mail friendly Blackberry devices has cornered the corporate market and is pushing into the consumer space.

Apple is minting it with its sleek but expensive iPhone. And only a few months ago internet search giant Google entered the field with its Linux-based Android software, designed to power internet-savvy mobile phones.

Oh, and then there is Microsoft. For years the giant of desktop computing has tried to push into the mobile phone market - not without success, but ultimately remaining a niche player... More at BBC.