iPhone does not support true split-screen multitasking like iPad
Use Picture in Picture for supported videos or FaceTime
Open a video app or FaceTime call
Start playing the video or call
Swipe up to go to the Home Screen
The video or call will continue in a small floating window
Drag the floating window to move it
Pinch to resize it
Use Slide Over or split view only on iPad, not iPhone
Use app switching to move between apps on iPhone
Use Safari tab groups or multiple tabs for browsing tasks
Use third-party apps only if they offer their own split-view style features