If you have to call someone you don't like, or someone you don't want to have your phone number, you can make a restricted phone call. With a restriction, your call goes through, but the other party cannot see who is calling in caller ID. Using this feature at the right time will help you avoid the costly and complicated process of having to change your phone number in the future.
Initiate your call. Press 67. The 67 code is called a "call display block." It hides your phone number from other parties.
Dial the phone number as usual. When the call goes through, the other party will see your call come up as "private."
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On your cellphone, go to "Settings" and then "Call Settings" (or similar). If you see an option for making all of your outbound calls private, select that option.
Call your cellphone service provider and ask to set a call restriction on your line. With this restriction, every outbound call you make will come up as "private" or "unavailable" on the other person's phone.