Chinese migrant workers, who make the bulk of the work force in constructions sites across China, use a cell phone in Beijing Wednesday, April 11, 2007. China is the world's biggest cell phone market with 461 million phones. AP Photo logo AP Photo 34 months ago

Chinese migrant workers, who make the bulk of the work force in constructions sites across China, use a cell phone in Beijing Wednesday, April 11, 2007. China is the world's biggest cell phone market with 461 million phones.