It seems fairly obvious that when you put your house up for sale that your agent will put a "for sale" sign in the front yard. The sign will identify the agent’s company, the agent, and have a phone number so prospective buyers can call and get information.
Signs are great at generating phone calls, even if very few actually purchase the home they call about. However, you might be one of the lucky ones. For that reason, you should determine what happens when someone calls the number on the sign. Does a live person answer the phone or does the call go to a voicemail or recorder?
You want someone to answer the phone while the caller is "hot." When buyers call the number on the sign, the call should go to a live person who can answer questions immediately. A potential buyer may be on the street outside your home, placing the call using a cell phone.