The password is what you set it to on your SoftPhone account.

ENGADGET: How-To: Use a Pocket PC PDA as a WiFiphone

Your account is your Vonage SoftPhone phone number.

ENGADGET: How-To: Use a Pocket PC PDA as a WiFiphone

We named ours Vonage SoftPhone.

ENGADGET: How-To: Use a Pocket PC PDA as a WiFiphone