tl;dr version: a LOT

Considering only memory, processing, and broadband communications power, duplicating the iPhone back in 1991 would have (very roughly) cost: $1.44 million + $620,000 + $1.5 million = $3.56 million.

This doesn’t even account for the MEMS motion detectors, the camera, the iOS operating system, the brilliant display, or the endless worlds of the Internet and apps to which the iPhone connects us.

This account also ignores the crucial fact that no matter how much money one spent, it would have been impossible in 1991 to pack that much technological power into a form factor the size of the iPhone, or even a refrigerator.

via The Loop