Hi @TEO77,
Your question has been translated to English as this is a global user forum. In the future, please write your question in English.
Do you want to turn on the option for hiding your number in outbound calls? Or do you experience that your number is hidden when you make a outbound calls?
You can choose what if you want to hide or show your number in the phone settings by going to: Settings > Call > Additional settings > Caller ID.
Let me know if that helps and I'm sorry if I misunderstood your question. 
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