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In Europe, Sony Ericsson's W-850 has buried Motorola's KRZR and LG's Chocolate models over the past two months. The old warhorse W-810 still tops prepaid sales charts in several markets.This is a major upset -- and a triumph of chunky and smart over thin and dumb. Even the new W-850 is 21 millimeters thick. That is relatively clunky compared with the sleek new bimbo phones almost half as thick, which tend to offer more limited software functionality. For the future of the mobile-telecom sector, the Walkman success is a relief -- consumers are demonstrating that they can and will purchase slightly heavier phones that deliver content over models that are cute but lack complex applications.