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Hvordan gjør jeg det. På xz2 compact
How do I do that. On the xz2 compact
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Hi @Borka09, welcome to our forum!
Your question has been translated to English as this is an International forum.
Your operator may have a code that you can type in before typing the number you want to dial and your number will not be shown for the counterpart, so you can have a look with them.
You can also open up the Phone application > tap the 3 dots in the top right corner > Settings > Calls > Choose the SIM card you want to change this on > Additional settings > Caller ID > Hide number.
I hope that helps! 
@Jonasshowed you howto do it permenantly.
Hide your number once
Type #31# followed by the phone number.
Should work everywhere
This and other codes can be retrieved on the internet.