This service enables you to conceal your phone number from the person you are calling, i.e. on their mobile phone's display.

• You can activate and deactivate this service permanently, in your mobile phone's menu.
•  You can activate the CLIR service on a one-time basis (for a single call) by entering #31# before the number of the person you are calling (e.g.: #31#0981234567).

When you are sending an SMS, the sender's phone number is always displayed, whether the CLIR service is activated or not.