Ask HN: How should you tag your phone number to reduce the number of robocalls?

I really don't think you can avoid spam. At the end of the day, there are only so many phone numbers, and it's trivial to enumerate them to find those that are live. Spammers can simply cycle through lists.

Now if you're worried about more "targeted" spam, I would probably say do not pick the "business phone" option.

The best and only way to avoid spam is to not pick up a number that you don't know. If it is someone important, they will leave a message. Rest are probably spam anyway.

Not sure this helps but since using Google fi I have no spam as all those calls are labeled spam