800-531-5081

I received 2 calls from this number late in the evening all on one night.  Very annoying.

Three calls last night, around 11PM. Who is this? Anyone know.

Called at 3:39 AM!  Curious, I answered it - it sounded like it was a fax machine, so I triggered my fax machine on the same line - but it couldn't negotiate an answer, so maybe it wasn't a fax machine...?  

According to http://members.fortunecity.com/marcshariat/id32.htm it's a number for Southwest Airlines.  Called and got a robot operator - dialed "O" and got a fax machine.  Weird.

I do not have a fax machine.  I have received at least 2 calls from "800 Service" 800-531-5081.  I get a fax signal when I pick up the phone.