If I had found something in the discussions, I wouldn't have post a new message.
So, I need to explain my confusion:
1) I intend tu use blackberry for the communication. So I not only need to know if the blackberry can be a modem, I need to know if it handles parameters (for example phone number to call) and ppp procedure.
2) blackberry can be used as a gprs modem, but I want a gsm (csd_ not gprs) communication (because it's cheaper).