How to easily hide your number when you call someone?
Please note, that this works only for iOS Phone app, however this also works for other phones.
Usually, when you are calling someone, your contact name shows up on the screen of the person who receives the call.
To call someone without showing your Caller ID, do following:
1) Open the Phone app and go to the Keypad/Dial menu
2) Type #31#, followed by the phone number (Example: #31#016056934351 or #31#+4916056934351).
3) Perform a casual call