Updated July 21, 2017 Dial 82 before placing your phone call, if you have per line blocking. This will hide your caller ID if you want to place an anonymous call to someone. To unblock your number, dial 82 again. Dial *67 if you have selective blocking. This will block your number for that particular call you are making. To unblock your phone, simply hang up and your next call will be unblocked. Dial the number of the person you are trying to call. Your caller ID is now anonymous and cannot be traced except by law enforcement conducting investigations.
