I go to my favorite urban legend webpage to look up the true/false on Internet and email stories. My favorite is Snopes.com. Here is part of what they have to say about the Do Not Call Registry for cell phones.

Claim: A directory of cell phone numbers will soon be published.

Status: Multiple:
A consortium of wireless providers is planning to create a 411 (directory assistance) service for cell phone numbers: True.

You must register your cell phone with the national "Do Not Call" directory before 1 January 2005 to prevent your number from being provided to telemarketers: False.

To read more, go to http://www.snopes.com/politics/business/cell411.asp