Verizon customers switching to the iPhone need this app
If you're already a Verizon customer and are planning to switch from your current phone to an iPhone, Verizon has an app for you for transfer of your saved contacts to the iPhone.
Before turning in your old phone and transferring your number to the iPhone, use Verizon's Backup Assistant to backup your contacts. Once you have your new iPhone, download the VZ Transfer app and follow the instructions to copy your contacts from your backup to the iPhone.
SPECIAL NOTE: Several people have noted that you need to use the app when connected to the 3G network, not WiFi. So turn WiFi off on the iPhone before you attempt the transfer of your contacts.