When I completed my 12th standard my dad gift me lumia 540 which is based on microsoft windows operating system. For me, I think windows based phones are worst moblie phones. There is nothing to do on these mobile. No great apps. Mostly good apps are paid app. Not even use hacked version of those paid apps. The app like whatsapp, instagram these all app are outdated, windows store gets late updated than Android phone. Lumia 540, doesn’t have good quality of camera, not even have filters to edit the pics. As microsoft has purchased nokia which was known for there battery power, but Lumia 540 have worst battery backup. Needs to charge after 4 hours. Standby battery backup is also very low.