We can't see exactly how any portal routes leads on a given day, but the calls you are getting are the business model working as designed. Sites like Zillow are marketing businesses, and one of the main ways they make money is selling buyer inquiries to agents who pay for leads. Request a tour or ask about a listing, and your contact information often goes out to one or more agents in that area. That is why the phone starts ringing. Two practical takeaways: - If you would rather not field a stream of calls, be deliberate about which forms you fill out and which boxes you check. - You generally get better representation by choosing your own agent up front, someone you interview and trust, rather than being routed to whichever agent happened to buy the lead. Pick your agent first, and the tour, plus every conversation after it, runs through someone who actually works for you.