LG Crystal GD900
LG may not get enough credit for just how inventive it was when it came to these daring phones. In the days when manufacturers were throwing everything at the wall to see what stuck, LG was responsible for releases like the Crystal, a slider phone with a transparent numeric keypad. Did it look cool? Absolutely. Was it a success? Absolutely not – the Crystal, unfortunately, came in the late 2000s just as full touchscreen smartphones had begun to take over the market.