I wached that last night and he cheated, buying the board whole. Loads of people have been doing this to for years. My first old iPhone 5, had about 6 screens and 2 replacment batteries. And a new back.
The only part of the phone that was original was the logic board. IPhone are the easiest phones to tear down and reassemble.
Now if he was to build the logo and board and install the OS, even just install an OS on a blank logic board, then I’d of been impressed.
A phone is actually way simpler than building a pc. The logic board is the pc, all he done was the equivalent of plugging a monitor in and blogging it into the wall (battery).
The film was shot well I’ll give home points for that. Also the location looked so good, a geeks dream shopping trip.