Acer Iconia B1-721 official Pictures. Acer Iconia B1-721 is a Smartphone of acer. The Acer Iconia B1-721 Android Tablet. Announced Jan 2014. Features 7.0″ Display, MT8312 Chipset, 2955 MAh Battery, 16 GB Storage, 1000 MB RAM. Acer Iconia B1-721 price starts.