You just bought Nexus 4 and you don't know anything about Android operating system, so I will guide you through literally first steps on this great phone.
Let me walk you through the procedure of adding a birthday or any other annually repeated event into the calendar of your Android powered Google LG Nexus 4 smartphone.
Windows Phone 8 enables you to choose the apps you want them to display its status on the lock screen of your phone. For instance a notification that you just got a new Gmail email.