Nokia focused on design elegance with the Lumia 900 and the phones that share its body design. The phone is built with a polycarbonate unibody -- there's no removable back, and as a result, the Lumia 900 looks unusually smooth. Like other unibody devices, like Apple's laptops, that means there's no easily removable backplate to allow access to a swappable battery. Is it a worthy trade-off of form over function? Usually -- and in the Lumia 900's case, everything but the battery is accessible from the top of the device.
The Lumia 900 has no microSD port, but the device's SIM slot and a micro USB port for charging and transferring files are hidden behind panels on top of the phone. A headphone audio jack also sits on top of the device.
The face of the phone is dominated by its screen and a black plastic bezel surrounding it. Thanks to Nokia's "ClearBlack" technology, the black background of Windows Phone 7 blends into the plastic bezel surrounding the screen, making the phone body look like a natural extension of the display. From there, we have to turn to the Lumia 900's innards to find out what kind of hardware it's running on.