http://videos.howstuffworks.com/science-channel/30366-its-all-geek-to-me-cell-phone-tricks-video.htm
* for Verizon and Cingular, # for T-Mobile, and 1 for Sprint.
If you call somone just spam all 3 and hopefully it'll work.
Don't use your built in 411:
http://videos.howstuffworks.com/science-channel/30207-its-all-geek-to-me-secret-cell-phone-key-strokes-video.htm
Also 1-800-GOOG-411 (4664) automated
1-800-FREE-411 (3733) small ad
and text query to GOOGL (46645)