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judgecorp writes "How many cells does it take to cover a city? In London's case, it will take 70,000 cells by 2015 for the next-generation LTE network needed for 4G mobile broadband, according to a calculation from PicoChip. A shame that's too late for 2012, when Mayor Boris Johnson warns that mobile data demands during the Olympuics may overload the current 3G network" Link to Original Source
No amount of careful planning will ever replace dumb luck.