Something interesting regarding unlocked BB (from Orange for example) with the carrier (like China Mobile) who doesn't support BB service.
the BB device could be used as a normal phone only, can make phone call and SMS, but not able to use GPRS at all. From the data flow above, I can understand why no GPRS.
However one can use this BB as a dial-up GPRS modem, it works perfectly with no issue.
I am just wondering if the Carrier didn't provide BB service, and BB can't browse sites at all by its browser, why GPRS modem works? How Modem skips Policy?