You have to add this modem string to the modem that shows up when you plug in your 7130
Then set up a dial up account in Win XP with these settings
Passwords = CINGULAR1
Dial Number = *99***1#
That's it. I am new to blackberries but I really like the 7130c. I am a Treo 650 user for the last year and half and although I do miss the touchscreen and the full qwerty keys, I love the 7130's form factor and the push emails.
P.S. I am on the new BlackBerry personal plan $29.99