you can download an app called “Unity Remote 5” it’s (on the App Store, the App itself is by Unity Technologies) and you can plug your iOS device (iPhone iPad into it) and... there are detailed forums on how to set it up but it’s super easy I do it all the time since I don’t have Apple dev, but basically you press play I the editor and the game starts playing on your iPhone/iPad. Not e you so have to have the build set to iOS, but that is easy.