Every February mobile phone manufacturers, networks, suppliers and retailers descend on Barcelona for the Mobile World Congress, and with the industry developing at an astonishing rate I kept a close eye on this year's event.

The men from Sony had a few neat tricks, but the company is struggling to differentiate itself from its competitors these days. It's understandable – there is only so much you can add to a four-inch glass slab running someone else's software. The company's latest unique design feature, though, to cycle a rainbow of colours through a large plastic aperture at the bottom of the handset, is just plain gaudy.

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