Samsung galaxy j2 is a good smart phone.it’s Buttery backeup.This is based on Android 5.1.1lolipop version os.the ram of samsung galaxy j2 2015 is 1GB but they in crased to 1.5GB.Network technology GSM/HSPA/LTE launch announced 2016. Dual sim.it’s good camera real camera 8MP auto focus LED flash and front camera 5MP and micro usb v.2.0