Garmin's great success with its Nuvi line of portable GPS devices lead the company to try and extend its market into cell phones. And with numerous smartphones encroaching into navigation, it's not surprising that Garmin is trying to fight back. After a couple of years waiting for the Nuvifone to come out, CNET's Bonnie Cha got a hold of one. We expect good performance as a navigation device, but how wil it handle the smartphone side of the equation?