Sorry to revive a "dead thread", but what if I was overseas? I'm just wondering from a technical side of what the unlimited international BB means. It sounds like when sprint "activates" internation roaming, it means that the card is registered and spread internationally so that the SIM card will work whereever roaming partners exist.

Then, when you travel and take your CDMA 8830 overseas, you activate the GSM section of the phone, which then access the cellular network through the now activated SIM card.

If that's the case, what's to say you can't take the now activated SIM card out of the 8830, and place it in a regular GSM unlocked BB and use it when you're overseas? Does BB/RIM/Sprint know that the SIM card is now in a phone with a different ESN/IMEI and has a different BB PIN code?