There are so many reasons that a caller ID number or name might not show up on your phone that it almost isn't worth explaining them separately over and over again.  Just pull up the web page

http://www.sandman.com/calleridbull.html

and read it until your eyes glaze over -- especially the part under the heading "caller ID spoofing" (about 3/4 of the way down) that explains how only those phone companies in a certain "club" get to share certain caller name databases.

Recorded message calling to sell emergency response devices for seniors.  We are on the do-not-call list.

I'm sick of getting these calls. I am reporting you today.

(424)278-9119 is not Beverly Hills! Calls once a week, silent on phone.

Calling recording at least once a week