From an email from my dad:
A directory of cell phone numbers will soon be published for all consumers to have access to. This will open the doors for solicitors to call you on your cell phones, using up precious minutes that we pay lots of money for.
The Federal Trade Commission has set up a “do not call” list. It is called a cell phone registry. To be included on the “do not call” list, you must call from your cell phone â€“ ie – the number you wish to register.
Call 1-888-382-1222, OR go to http://www.donotcall.gov/ and add your number to the do not call list.