Make your Phone Number Private When Dialling
What happens if you need to speak to someone and you know they might not want to take your call if they knew it was you... you need to call anonymously and block your caller ID. Here is how you do it.
To make a private call in Australia, dial 1831 before you dial the number. For example, if you were going to dial (07)12341234 for a Queensland local number, you would dial 183112341234 if you are inside Queensland. If you are outside Queensland and you need to include the area code, you would dial 18310712341234.
You can test it right now - call your mobile phone number. Dial 1831-04xxxxxxxx and you will see that it says Blocked, or Anonymous, or Private on the screen depending on what your phone uses as default.
Next time you want to call a friend for an April Fool's joke and pretent to be someone else, this is the trick to use.