I'm Lance Somoza, a professional IT Consultant with over 15 years of industry experience and an obsession for technology. This is my tech soapbox.

I would love for Apple Pencil to work on the bigger iPhone, especially with iOS 11’s quick notes feature. Like Jason says though, it would probably need to be a shorter version. Writing on an iPhone with the current Apple Pencil would be kind of comical. iPhone would also need the special screen layer found in iPad Pro to track it properly. We’ll see.