Via so-called GSM network codes many settings can be changed with your mobile phone provider. The phone app and the numeric keypad are used to enter a code, which is transmitted to the mobile network. The setting is then automatically accepted for your phone number.
So, of course, there is also a network code for the call number suppression. We'll explain how to use this network code:
Do not transfer your own number - This network code is required if the number is never to be transmitted:
- #31# Always switch off the transmission of your own telephone number
- *31# Always switch on the transmission of your own telephone number
The network code must be sent by pressing the green handset! The setting is immediately implemented, usually even a short status feedback pops up.
Suppress own phone number only for certain calls - network code
- #31#Phone number Hide only your own phone number for this call
- *31#Phone number Display your own phone number only for this call