Metal detector. No, I'm not joking. One of my high-school classmates works as R&D there. They ask you to pass through a metal detector gate, take away your pho

Metal detector. No, I'm not joking. One of my high-school classmates works as R&D there. They ask you to pass through a metal detector gate, take away your phone if found, then give your a company phone for emergency call only. It's that strict (at least for R&D. Probably not for management and others).