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I got rid of fixed line and set iPhone to 'ignore calls from numbers not in my contact list'.

How did you do that??

Go into the "Do not disturb" settings, and you can find an option for that there.

Having DND enabled all the time could have unintended side effects though.

Ah. I had not considered using DND for that purpose. Thanks!

Actually there is now a silence unknown caller options if you have an up to date iOS https://support.apple.com/en-ca/HT207099