*67 - Most North American mobile phones; Canada landlines. #31# - AT&T North American phones; Canada mobile phones; Most European & South American phones. 1167 - Most North American rotary phones. 141 - UK phones.
Depending on your phone, you may have to tap the Dial or Keypad tab before you can dial.
The final result should look something like this: *67 (123) 456-7890
Most carrier do not charge to make your phone number private, though a few may charge a fee to make your number private. If you want to temporarily allow your caller ID information to appear when placing calls, dial “*82” before dialing a number when placing a call. [3] X Research source
Google Voice numbers are not listed publicly. However, if you have posted your Google phone number online or give it out to other people, it may still be traceable back to you. Use the following steps to hide your Google Voice number when making calls.