I found the guys that make Apple's USB cables: Cheng Uei Precision Industry Co., Ltd. (Foxlink) http://www.foxlink.com/web/en/portfolio-item/usb-cable/#1474...
iPhone boxes!? Brilliant International Group Ltd http://www.brilliant-group.com/products_electronic/
Sim card trays: Chengdu Homin Technology Co., Ltd. http://www.cnhomin.com/
Watch/Camera glass: Biel Crystal Manufactory Ltd http://www.bielcrystal.com/
iPhone Haptics/Speakers module: AAC Technologies Holdings Inc. https://www.aactechnologies.com/index.php?m=content&c=index&...
Then you come across something truly extraordinary: Catcher http://www.catcher.com.tw/technology.aspx
Catcher has a market cap of 7 Billion USD. They own and operate 18,000 CNC machines, the largest fleet of CNC machines in the world. This is probably where iPhone case and Macbook Unibody is manufactured.
Edit: I found a video of Catcher: https://www.youtube.com/watch?v=UknhWoL6GWQ Edit: Tons of information on Catcher