You can make anonymous calls (CLIR = Calling Line Identification Restriction). Your phone number will not be displayed when making outgoing calls. You are calling anonymously.
Prerequisite: Anonymous calls are only possible via VoIP connections through providers that support the "anonymous calling" function. You may have to ask your VoIP provider/platform to activate this function.
Making an anonymous call
-> Select Services -> Withhold Number
Then proceed as normal
Enter the phone number.
Lift the receiver
The number is dialled. Your number is not transferred.