This wasn’t so much a smartphone as it was a media transformer. As companies started to stuff better specs in smaller devices, some wild and crazy ideas started to spring out of OEM labs. This week’s Guess the Phone in particular was never content to just be something you used to communicate; it wanted to be the only device you used for everything. Why not perform multiple duties instead of requiring many different work stations? And what about that curious sensor on the back?

During its time, this device was heralded for a number of reasons. It had the looks, the function, and the horsepower to fit into anyone’s gadget arsenal. That being said, that doesn’t mean it was a top seller. In fact, the handset was bogged down by plenty of issues that really kept it from being truly great, though looking back on it now, it’s easy to recognize it for its great ideas and terrific foresight.

Much of what made this handset stand out—aside from the rear sensor—is the handful of accessories users could buy to extend the functionality; it was never just another smartphone. This device was something you could use in your pocket, on your desk and even with your TV. Back in those days, when smartphones were still finding their footing, the ideas were certainly novel, if not a little unnecessary.

The lasting memory will be that little area on the rear right at the top. I’m not saying what it is, but chances are high you already know. For its day, this device had a lot to offer, and showed signs that the company that made it is capable of thinking outside of the box. Considering its most recent device, which is assembled here in the U.S., I’d say the company matured quite well since this mystery handset hit. I just wonder if they’ll add what is now its most recognizable feature into future devices.

Last week’s Guess the Phone was Sony’s Xperia Play.