Oh no! I understand how frustrating random messages can be on your phone.
Do you use any GPS services on the phone at all?
(i.e. VZ Navigator, Google Maps, any mapping application)?
If you are not using any mapping applications, go to Settings>Location & Security>Disable Use Wireless Networks, Disable Use GPS Satellites, Disable Enable Assisted GPS
Had the same thing happen to mine. Spent over an hour on the phone with verizon and no fix. Then took it to my local store still couldn't fix it. They ended up just replacing it.