While I can see merits in your idea, my experience of Web nased listings is they are a tool used by dubious space salesmento phone you.
Very little customer activity.
Because I am receiving about 10 calls a day from telesales people I am reluctantant to divert my phone to mobile.
It also appears that if they get your number from Marketing Data, how do you prove otherwise you are not covered even if you have blocked the number with TPS. As you have given permission to be contacted.