Gionees trying to stand out from the Huaweis and Oppos of smartphone-mad China with its new Elife S5.5, which it claims is the worlds thinnest at 5.5mm. If so, that would edge out the 5.75mm Vivo X3, the current champ (for reference, the iPhone 5s is 7.6mm thick). If battery life is the first thing that pops into mind for such a phone, Gionee claims itll last all day like its (much thicker) flagship, the Elife E7, thanks to a 2300mAh battery.