Read the info at this link, for helpful advice:
http://www.craigslist.org/about/scams

Unfortunately, it seems some folks neglect to read even the first warning:
"DEAL LOCALLY WITH FOLKS YOU CAN MEET IN PERSON?follow this one rule and avoid 99% of scam attempts."

More information about that scam (and others) is at
http://phonehelp.2truth.com/facts.html

That site also shows how other 800notes visitors have reduced the number of telephone scams and telemarketing calls they receive.  (That site also has a link to Amazon's phone blocker devices and apps, as well as a page showing various government sites that accept complaints or warn about scams.)

Selling car on craigs list and received a call from Puerto Rico.  Checking to see if numbrr is linked to a scam