I think you are right. My parents German landline received way more spam calls in the 1990s than now. Now it's almost non existence, despite the number being un

I think you are right. My parents German landline received way more spam calls in the 1990s than now. Now it's almost non existence, despite the number being unchanged since 40 years and in public telephone books. - Unsolicited commercial calls got outlawed. - Giving your ok to being called for ad-stuff can't be combined with other oks. - Foreign telecom networks can't pretend to have a German number. Local providers are required to strip the number, making the call look less trustworthy. - Having the minute price being said when calling an expensive number.