Today, the Patently Apple website disclosed a patent from the US Patent and Trademark Office that revealed that Apple may be developing an Apple Pencil for the iPhone.
First, Apple Pencil for iPhone and MacBook Pro
Apple mentioned that some devices' touch-sensing screens can use the stylus to provide additional input. Such as mobile phones, laptops and tablets. However, Apple has publicly stated that the notebook will not be equipped with a touch screen, so the possibility of using Apple Pencil on the touchpad will be greatly increased.

Second, Apple Pencil is not only used in the "memo" application
One day, Apple Pencil will be used on iMovie and/or Final Cut Pro. Figure:

Third, can also be used in the "SMS" application

Fourth, in restricted mode for painting applications

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