Dejian Zeng spent 12 hours a day attaching one screw to iPhones. As part of his summer project, the NYU grad student went undercover for 6 weeks at a Pegatron factory in Shanghai. He lived on-site in a dorm with 7 other people and got to experience what really goes into making the popular mobile device. He tells us what it was like.

For more information about the project, check out Kif Leswing's full interview with Zeng.

Follow Tech Insider: On Facebook