800-285-5903

Overview
This number seems to be associated with "Great Fun!", a site owned by Trilegiant.

Encounters
Apparently many people have received erroneous credit card charges from an entity whose description includes this phone number and some variation of "great fun":
 * 2006-06-29 Cheaptickets.com - TLG*GREATFN - GREAT FUN at ripoffreport.com
 * 2006-06-21 Tlg*greatfn17992564jun at complaints.com
 * 2006-06-13 TLG*GREATFN57829630MAY 800-285-5903 CT at complaints.com
 * 2005-11-05 GREAT FUN NOV 800-285-5903 CT
 * 2005-08-21 Buy.com and Great Fun Are Inept
 * 2005-04-13 Scam - "TLG*GREATFN" transactions on Credit Card statement
 * 2005-03-07 trilegiant tlg

It may be that this is something that is technically legal, perhaps buried in fine print during the check-out process from one of the affiliated vendors, but if so it is apparently confusing enough that many people did not realize they were signing up for it.