Yet another Verizon Wireless announcement today is the introduction of City ID, an enhanced mobile caller ID that displays the city and state of incoming calls. It'll be available first on all LG Voyager phones, but Verizon hopes to roll it out to more of its phones soon. 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.