To block Caller ID on a per-call basis: From the dial pad, enter #31# + the 10-digit number, and then tap Call. (Example: #31#9995554444) Note: Alternately, *67 may be available in some markets. Enter *67 + the 10-digit number, and then tap Call. (Example: *679995554444)
To unblock Caller ID on a per-call basis: From the dial pad, enter *82 + the 10-digit number, and then tap Call. (Example: *829995554444)