I bought a samsung brand smarphone model number samsung z2 on Oct.’16. It is the best, chipest and the most compatible 4G smartphone avaiblable at a low price of Rs.4200. But actually the OS comes with Tizen 2.4. Also it has bad camera feature. But video call with Jio sim is very bright. And some android useful apps are uninstallable to this device. Sometimes the device hanged. The whatsapp app is pre-installed in this device but not upgradable. And the whatsapp doesn’t support the latest video calling feature. Hope you guys very useful on these comments.