We started looking into health insurance through the "marketplace", since we can't afford Cobra right now. All the web sites referred for us require a phone number before you can look at pricing, so I put in my FAX number.
Turns out to have been a smart thing to do - I've had at least 100 calls come in on the FAX line since yesterday.
I picked up a couple before the machine could try to connect - dead silence even after I said "Hello". For the couple that did connect me to a human, I told them this was a FAX line, and please don't call back.
There must be a whole lot of potential profit for the insurers in getting someone to sign up for them to be so persistent...