I had a message in my email resulting from an adult "casual encounters" craigslist posting I did for the Detroit, Michigan area and that number was used too.  The email user name was "lashawna chalmers"  The only web result I got on that name was from a dating website "meetme"
Her mail said, "Still looking? I had a post up way way back, no luck though.Just heading to work now, can you text? 3207746648    I'll tell you more"