Mercedes has been building SUVs by robots in Tuscaloosa, AL since mid 1990s. I witnessed the robotic production line with my own eyes during the Tuscaloosa factory tour in 1998. I saw robots putting minute things inside of the SUV with my own eyes. I can also tell you that the majority of the engineering and technical personnel that worked at that factory was German because (I guess) Americans didn't have people who knew how to build or service robots. It seems that now (20 years later) we still have no expertise on robotic production lines; hence, the comments like yours that claim that building an iPhone by robots is not possible.
I don't know if this plant was an exception or it was a general direction that the European automotive industry was taking back 20+ years ago. I know there's a BMW plant in South Carolina that I used to pass all the time. I never took a tour of that plant, so I don't know if BMWs were being built by robots or not. I can only speak for the plant that I toured, which was absolutely the fact literally 20 years ago.
Is there a YouTube video?