Cat S31 official Pictures. Cat S31 is a Smartphone of cat. The Cat S31 Android Smartphone. Announced Sep 2017. Features 4.7″ Display, Snapdragon 210 Chipset, 8 MP Primary Camera, 2 MP Front Camera, 4000 MAh Battery, 16 GB Storage, 2 GB RAM, MIL-STD-810G Compliant, Corning Gorilla Glass 3. Cat S31 price starts.