https://www.polygon.com/2019/3/7/18254496/ps4-remote-play-iphone-v650-system-update

A new system software update for PlayStation 4 rolled out today, giving console owners the option to control the system from their iPhone or iPad, via Remote Play for iOS. A new app, PS4 Remote Play, is available to download for free from the Apple App Store.

PS4 Remote Play will let iOS device owners control their PS4, join voice chats using the microphone, and enter text on their console using the keyboard on their mobile device. The app requires iOS 12.1 or later, a PlayStation Network account, and a home WiFi network. PS4 Remote Play cannot be used over a mobile network and is not compatible with a DualShock 4 controller, according to the app’s release notes.