From the home screen, tap Phone. Note: When in "Easy" mode, you can't see caller ID information.
From the Dial pad, tap MORE.
Tap More settings.
Tap Show my caller ID.
Tap Hide number. Note: To block your Caller ID on a per-call basis, dial #31# or *67 before the 10-digit phone number (Examples: #31#9995554444 and *679995554444). To unblock Caller ID on a per-call basis, dial *82 before the 10-digit phone number (Example: *829995554444).
To show your caller ID, tap Show my caller ID again, and tap Show number.