Here's a headsup on the status of the list: The FTC built the five-year expiration date into the program to account for changes, such as people who move and switch their phone number. "Just like a regular person who needs to clean out their address book every so often, the commission felt that was something that was important to do with the registry," explained Parnes. Doyle, however, points out that the list is purged each month of numbers that have been disconnected and reassigned to new customers. He called the FTC's position on the need for an expiration date "completely bogus." People can register their home and cell phone numbers or file complaints at http://www.donotcall.gov or by calling 1-888-382-1222.