It should be possible to change.
But I honestly don't know how because I have not used it.
I also not sure if it can directly connect to a cellular phone because it only have SPP and DUN is not present.
BTW, I am also selling bluetooth modules that supports both SPP and DUN.
See here:
http://geekzone.freehostia.com/btserial1-bluetooth-serial-port-controller-and-wireless-uart-cable-replacement-moduleComplete project using this module is also found there for reference. I sell it P1500 a piece or P2500 one pair (2 pcs). You could use paypal as payments or any local money transfers.