Gionee, a Chinese smartphone maker, has introduced what may just be the slimmest smartphone in the world, Elife S5.5 of thickness 5.5mm. The device features a 5-inch display, 1.7GHz quad-core CPU and 13MP rear shooter and a 5MP front camera. The device has been listed for pre-order on the company's China page, at about $370 (Rs. 23,000).