City ID is an enhanced mobile caller ID that displays the city and state of incoming calls. An application from Cequint, City ID lets customers know a little more information about those frustrating "unknown numbers." But as with a lot of these services, it'll cost you. The City ID application will be free for 15 days for Voyager customers, but after that it's $1.99 a month per line. (Quoted from a cnet article from 9/2008)
Call Verizon CS to see if it is a feature available for the phone you have - it's not available on every phone.
