This is cool, very much the hacker ethos. But I didn't see any evidence that it can make a phone call though?

Yeah, I actually left a comment to that effect on the video when I saw it last week, because I’m pretty sure the placement of the mic / earpiece is incompatible with a traditional voice call. Although arguably traditional phone calls are the least important feature of smartphones for gen z. Even if it was important I would guess Bluetooth headsets are more common than actual holding the phone up to your ear.