You can do iPhone split screen multitask to use two apps on screen at once, without a jailbreak. Maybe you want to scroll your Instagram feed at the same time as playing a YouTube video.

Split-screen was Apple's original multitasking solution for iPads, but I don't think it's the best. Stage Manager offers more window control, easier app switching, and support for up to four apps ...

Android's Split-screen mode, also known as Multi-Window, lets you run two apps simultaneously. This makes multitasking easier on your device. Here is a comprehensive guide to using this feature.