Unfortunately, the iPhone 15 does not have a built-in handwriting feature. Apple's current operating system, iOS, does not have a native handwriting input method.
While you can use third-party apps to write by hand on your iPhone, there is no way to enable handwriting directly on the iPhone 15.
Here are some popular third-party apps that allow you to write by hand on your iPhone:
- Notes: Apple's Notes app allows you to add handwritten notes using the Apple Pencil.
- GoodNotes 5: A popular app for note-taking and digital handwriting.
- Notability: Another popular note-taking app with handwriting support.
- Nebo: A handwriting recognition app that allows you to convert your handwritten notes into text.
These apps are available for download on the App Store.