Hi @Chalo, welcome to our forum!
You can change so that your number is always hidden, but that means that you will need to change the setting again if you want to the recipient of the call to able to see your number.
To change this, open up the Phone application > tap the 3 dots in the top right corner > Settings > Calls > Additional settings > Caller ID > choose "Hide number". If you are using a Dual SIM device, you will need to choose which SIM card that you want to change this for.
I hope that answers your question! 
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