Backup Assistant is an excellent app to use to transfer your contacts to your device! As Ann154 stated, you may have to uninstall the app from the phone then activate the device to your mobile number before reinstalling the app to the phone. This will help our network identify that a new mobile number is active on the phone and a new Backup Assistant account needs to be created or transferred to this phone. If you haven't done so already then may I ask that you activate the phone so you can uninstall the app and re-download it from the market. If you come to an unexpected error message or setting then please reply to this message for additional assistance.
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I reactivated an old phone that I had previously on another number on my account. When I tried to use back up assistant I had to call a Verizon rep so they could go in and identify the old number and remove that phone from that account (that is how it was explained to me)...anyway it was an easy quick call and it was fixed promptly.
To reset go to your Media Center
Go to Browse & Download
Go into Backup Assistant
Go to Help, If Help is not an option you may need to type in the pin of the old backup assistant phone number and load their contacts. You can then delete these contacts and reopen Backup Assistant. You should then see the help option
When in Help you Hold down your phones camera button until a hidden menu is opened
Choose the option Reset signup data
When you reopen Backup Assistant it should now use your current number
Type in your pin which is usually the last 4 digits of your phone number
You are now fully operational partner