When people started calling my personal mobile number with questions about a voluntary organisation I'm involved with, I was confused: we weren't sharing that number. It turns out that Google had decided to take the number I used to verify my identity for Google Business some years prior and start putting it in Google Search results. WTF, Google?
Wait, I suspect that we don’t live in the same country.
In Italy keeping the number unlisted was free (you just needed to declare it when you were signing the contract) and I have no memory of something like the 411.