The Xperia X1 is a strange fish and no mistake. Sony Ericsson has dipped a toe in the smartphone arena with this phone, and has come up with a wide screen, sliding keyboard handset with a superb physical design. All good.

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There is a very original user interface too, which is pretty much a requirement for any high end smartphone these days. But underneath that interface Sony Ericsson has chosen to use Windows Mobile, an operating system with its roots in the business community rather than with consumers.

Build quality is excellent with a good deal of metal in the casing to help with robustness as well as high-class looks. The sliding keyboard has a lovely gliding action as it slides out of a long edge, and when it is in use the screen sits at a slight angle making it easy to view when the Xperia X1 is on your desk.