For sale: Systems that can track where cellphone users go around the globe(washingtonpost.com)

   Verint, which also has substantial operations in Israel, declined to comment 
   for this story. It says in the marketing brochure that it does not use 
   SkyLock against U.S. or Israeli phones, which could violate national laws. 
   But several similar systems, marketed in recent years by companies based in 
   Switzerland, Ukraine and elsewhere, likely are free of such limitations.
   
   At The Post’s request, telecommunications security researcher Tobias Engel 
   used the techniques described by the marketing documents to determine the 
   location of a Post employee who used an AT&T phone and consented to the 
   tracking. Based only on her phone number, Engel found the Post employee’s 
   location, in downtown Washington, to within a city block — a typical level 
   of precision when such systems are used in urban areas.