Sony Ericsson's first Android-based smartphone, the Xperia X10, comes with a unique user interface that's designed to improve handling and organization of communications and multimedia content. But one analyst said the interface still needs work, particularly when it comes to speed and responsiveness, before the phone hits the market.

The X10 will be the flagship model in a family of phones coming to market during the first half of next year, Sony Ericsson said, without providing details of other models in the lineup.