Workers assembling iPhones, iPads and other devices often labor in harsh conditions, according to employees inside plants, worker advocates and documents published by companies themselves. Problems are as varied as onerous work environments and serious - sometimes deadly - safety problems.

Employees work excessive overtime, in some cases seven days a week, and live in crowded dorms. Some say they stand so long that their legs swell until they can hardly walk. Under-age workers have helped build Apple's products, and the company's suppliers have improperly disposed of hazardous waste and falsified records, according to company reports and advocacy groups that, within China, are often considered reliable, independent monitors.

More troubling, the groups say, is some suppliers' disregard for workers' health. Two years ago, 137 workers at an Apple supplier in eastern China were injured after they were ordered to use a poisonous chemical to clean iPhone screens.

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