people get them from websites people join...wether it be job sites, or getting online quotes, etc etc......so it may be a good idea to double check what sites you visit....also its better to answer, and get OFF their calling list, that way the same # doesnt call again and again...there are also auto-dialers, that just go through a list of phone numbers, so it could be that they dont HAVE your #, but just went through a list