> Here's an example for iPhone where they're using some complex mounting frame to connect a 35mm prime lens to the front of an iPhone. The phone becomes more like a smart camera back.

That’s... not an iPhone, though the video may have been created for a smartphone ad (I don’t know and I don’t think the video said)

In fact I didn’t see anything in that which specifically says Apple does it, and I’m pretty sure that Apple has said several times that they use an iPhone without any special lenses or attachments.