Go to Settings > [your name] > iCloud, then turn on Notes. Your iCloud notes—and any changes you make to them—appear on your iPhone, iPad, iPod touch, and Mac where you're signed in with your Apple ID.
What does on my iPhone Notes mean?
Any notes listed under “On My iPhone” (or “On My iPad”) are stored locally on your device. To move any of these notes to iCloud, tap on “Notes”, or on another folder under “On My iPhone” containing notes you want to move.
How do I use Notes on my iPhone?
How to Write Notes on Your iPhone with the Notes App
- Tap the Notes icon on the Home screen. The Notes screen appears.
- Tap the + button in the top-right corner to start a new note. The virtual keyboard appears.
- Type the note and, when you're finished, tap the Done button in the top-right corner to save the note.
