LG Optimus LTE SU640 official Pictures. LG Optimus LTE SU640 is a Smartphone of lg. The LG Optimus LTE SU640 Android Smartphone. Announced Oct 2011. Features 4.5″ Display, Snapdragon S3 Chipset, 8 MP Primary Camera, 1.3 MP Front Camera, 1830 MAh Battery, 4 GB Storage, 1000 MB RAM. LG Optimus LTE SU640 price starts.