Once you've downloaded and installed the app, open it, and you will be taken to a screen where you need to fill in your PSN account information. To make sure that it's the correct app that you need, simply check that the developer's name is PlayStation Mobile Inc.
This will take you to a screen where you can download the app. So the first thing you want to do is head over to the App Store and search for an app called PS4 Remote Play. We will be using an iPhone 7 Plus to take you through the process of setting everything up. In this guide, we'll show you how to connect your PlayStation 4 controller to your iOS device and use it as a portable device to play your PS4 games. Namely, with iOS 13, users can now pair their DualShock 4 controllers with their iOS devices, and stream and play PS4 games via the Remote Play app that was introduced with the iOS 6.50 firmware update. The update has introduced a variety of new things that significantly enhance the user experience, including some neat gaming features for PlayStation 4 players. Apple have recently deployed the iOS 13 update to its newer devices, including iPhone 6s and later models.