1. From the home screen, tap the Phone icon.
   
2. Swipe down from the status bar.
   
3. Tap Settings.
   
4. Tap Show My Number.
   
5. Tap the Allow My Number To Appear When Calling switch to toggle on/off.
   Note: To block your Caller ID on a per-call basis, dial *67 before the 10-digit phone number.