Sansumg Z2 Mobile Phone has a Tizen Operating System. This OS does not support most of the apps and it is difficult to download apps. Camera is not good, Hanging problem, Battery back up is not good, Phone getting heated during charging. Video Call not allowed. Battery drains quickly, Hotspot not working, Very bad touch quality, Tizen Store not having more apps, we can not install .apk, only .tpk. Big Brand but phone quality is not good. Plz dont buy this phone.