For iPhone 6 Defects, Apple Has Failure Analysis Team Ready - Businessweek

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"All consumer-electronics companies try to keep an eye on complaints during their product launches to head off major problems early, but the sheer number of Apple devices produced around the clock in Chinese factories makes even small tweaks a massive enterprise. Apple’s advantage is its retail stores, Fawkes says: HP and Dell would have to coordinate similar operations with retailers such as Best Buy (BBY), but first responders in Cupertino learn directly of a defective iPhone in New York, Paris, or Tokyo as soon as a Genius Bar staffer reports it. The phone goes on the next FedEx (FDX) plane to California. Using the serial numbers in each device, Apple can trace a problem down to individual workers on an assembly line."

For iPhone 6 Defects, Apple Has Failure Analysis Team Ready - Businessweek