If you decide to upgrade your smartphone someday, don't throw away your Verizon XV6800. It can be used as a standalone GPS device, even if the phone isn't activated or connected to any service plans. Therefore, you could make a TomTom or Garmin out of your Windows Mobile XV6800 and have it as a backup GPS.
Have GPS devices really improved the safety of driving? This is somewhat controversial because some may argue that people are getting into more accidents as they tap on the screen and lose focus on the road. Others may say that people are safer because they're more confident about their driving and they aren't slowing down erratically or making unsafe turns.