Huawei U8520 Duplex official Pictures. Huawei U8520 Duplex is a Smartphone of huawei. The Huawei U8520 Duplex Android Smartphone. Announced Oct 2011. Features 3.2″ Display, Snapdragon S1 Chipset, 3.15 MP Primary Camera, 1500 MAh Battery, 256 MB RAM. Huawei U8520 Duplex price starts.