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Despite selling six million more mobile phones than expected, Motorola says it missed its already lowered fourth-quarter sales target by $250m. The Chicago-based technology communications company says this will take a razor to its profit margins. These challenges, moreover, do not appear limited to Motorola. Nokia, the world’s largest cell-phone maker, warned of similar difficulties in late October. The trouble is one of geography and flooded markets. Almost everyone in the developed world alre...