These instructions will block your phone number for ONE call, you will need to do this every time you call out.
Depending on your cellphone carrier you will need to enter either #31# or *67 in front of the number you are trying to reach.
E.g., #31#519-888-4567 or *67519-888-4567
Your number will not appear to the receiver, it will either appear as Unknown Number or No Caller ID.