If you are Nexus 4 user, we have some good news for you today. Google has officially started rolling out Android 5.1 Lollipop OTA update for the Nexus 4 users. However, the factory Image is still MIA.
Since it is an OTA update, it will be rolled out in stages. You will receive the notification for the update. But if you don’t want to wait, you can check out the setting of the phone if you are entitled for the update.