The first thing I noticed when I stepped into Recellular’s Ann Arbor warehouse was the flags. From the rafters, dozens of flags of the world oversee the processing of more than four million cell phones each year. Algeria and Mali keep watch as donated phones are sorted by make and model into row after row of labeled plastic trays. Brazil and Poland command dozens of test benches, where workers inspect, clean, and repair used phones for resale. Puerto Rico and Great Britain hang over the upstream holding area, where hundreds of used and refurbished phones wait in addressed boxes to be shipped out to customers. Each flag represents an employee—they add a new flag every time they hire someone from another country.