Replicant

Is it an option that already exists (I do not find it in the default phone application) and that you would like to be turned on by default, or is it a request for a new feature?

Inserting the same sim card in a windows ce phone and I can go to a location in the menu and set hidden caller id. Then every call from the phone will have hidden caller id. This is the option I want on replicant 6. For my part, not being able to do hidden caller id phone calls, will make me not use replicant 6. I would expect hidden caller id being important for people who else are interested in replicant 6, because it is about security and privacy. I have not found a code to put before a phone number that will make a phone call having hidden caller id.

Does hidden caller id work on lineage on the samsung i9100?

Look here
https://en.wikipedia.org/wiki/Caller_ID
Scroll down to
Disabling caller ID delivery.

Try the different prefixes.
Also those not for your country. Also both landline and mobile phone.