This number keeps calling me every day! Never leaves a voicemail, so must be a scam! Although it could be connected to Craigslist. I recently sent a few emails out to available units for rent in my city so perhaps there's a correlation.
I called back this number on a WIFI calling system and it is a business lifeline scam, where you can get a 5 figure monthly income. One of those ones that goes on and on without telling you anything.