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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
There are 3rd party stylii that work with the iPhone and certain note taking Apps if that's what you want.
Adonit is highly regarded as a maker of compatible stylii.
The dash works with iPhones.
And they suggest Apps you may want to use with it:
This is a user-to-user support forum. No one here has information about unannounced products but you can make the suggestion to Apple via Feedback - iPhone - Apple
If not, any chance that Apple will introduce an “iPhone Note” so that we can write notes with Apple Pencil or with any other stylus pens?
Can I use Apple Pencil with iPhone X ?