Apple Pencil 1 will charge from iPhone with lightning port. Useful for if you don't want to unplug iPad from charging/using as a second display or if incompatible with new iPad USB-C :
You Can Charge Your Apple Pencil With iPhone - iOS Hacker
iPhone 11 Adding Apple Pencil Support? - Do we want this or 3D Touch? - YouTube
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Can You Use Apple Pencil On An iPhone? Compatibility, Explained - Screen Rant - Business Telegraph
Apple May Launch 7-Inch Foldable iPhone With Apple Pencil Support in 2023 - MacRumors
iPhone 11 Pro With Apple Pencil Tipped By Case Company - SlashGear
The Apple Pencil Doesn't Work With the iPhone, but Other Styluses Do
Apple Pencil For iPhone Scrapped At 11th Hour, Leak Claims
iphone Pencil ( New Leak ) | MacRumors Forums
Can You Charge Apple Pencil with iPhone? - WorldofTablet
Apple again rumored to be adding Pencil support to 2018 iPhones - NotebookCheck.net News
This 'iPhone 11' case manufacturer is expecting a shorter Apple Pencil | AppleInsider
Connect Apple Pencil with your iPad – Apple Support (UK)
The Apple Pencil Doesn't Work With the iPhone, but Other Styluses Do