How to Block Caller ID for One Call
Most people in 2011 have some kind of caller ID, either on their home phone or their cell phone. That means when you call someone, they will have your phone number. However, you probably do not want everyone to have your phone number. Luckily, there is a simple code you can enter in your phone to block your number from being captured by caller ID. This code works for both land line and cellular phones, but the method slightly differs.
Land Line Phones
Pick up the receiver and wait for a dial tone.
Dial "*67" on the phone and listen for a dial tone again.
Dial the number you wish to call. Your number will not be displayed on their caller ID for this one call.
Power on your phone.
Enter "*67" followed by the number you wish to call. This is entered all at once. As an example, to call 555-555-5555, you would enter "*675555555555."
Press "Send" on your cell phone. The call is placed, but your number will not be displayed on the recipient's caller ID.