Interfacing with Nokia 6680- Software need it?

Hi
I've got an Arduino Mega and I would like to connect it inside my robot and control it by this cel phone:

Which software do I need to make the phone talk with Arduino?
This cel doesn't have wifi just BT.
is it better connect them by usb or BT?
thanks

Google RX TX FBUS & Good Luck!

http://www.insidegadgets.com/2013/01/12/how-to-use-nokia-f-bus-to-send-an-sms-message/

thanks
i am scared about your good luck!
I am going to check