While this top-secret prototype is hardly a consumer device, we're happy to give it a Repairability Score, especially since it may serve as an example of how simple a smartphone's construction can be.

Project Tango Repairability Score: 9 out of 10 (10 is easiest to repair).

The battery can be replaced in seconds with no tools.

Seven screws hold the entire device together.

Several modular components can be replaced independently: speakers, cameras (all three!), IR projector, and display assembly.

A few components remain soldered onto the motherboard, increasing replacement difficulty. These include the vibrator motor and USB ports.