PC gamers know about the advantages of using a second monitor. From to watch the chat in real time in case of streaming, have a series of background while we play, etcetera. On PlayStation 4 you can do something similar, but with your mobile. The method to turn the smartphone into a second screen for PS4 is very simple. The first step to consider will be to connect both the console and the mobile device to the same network. In 'Settings' for PlayStation 4, select 'Connection settings for PlayStation App'. Remember that this is the mobile application for the console, so you will need to have it installed. Pair each device and you're done. Now you can send messages to your friends, for example, while you are in the middle of the game.
