How WNP works | Technical service details | Consumer forum

In case anyone is interested in how phone number portability "works", i.e. how the phone system knows to route your call to the right service provider after you've ported your number.

The Company With the Biggest Little Black Book

Every phone call, fax and personal computer connection in North America depends on the services of a little-known company called NeuStar, based in Sterling, Va. The company manages a directory of 500 million telephone numbers in the United States and Canada...