The RIM BlackBerry 8830 World Edition is available only in the US and Canada, but can be used for international roaming.
The RIM BlackBerry 8830 ($300 after a two-year activation with Sprint and an ongoing instant rebate) is the first PDA phone that's compatible both with Sprint's CDMA network and with GSM networks for international use. The inclusion of GSM - even if it's only for overseas - is a huge bonus for mobile workers who need a phone that can work wherever they are. The 8830 comes close to fitting that bill - it will work on 900MHz and 1800MHz GSM networks outside of the United States (and that covers Europe, the Middle East, Africa, and most of Asia).
The SIM card slot for GSM use is located in the battery compartment, next to the mini-SD Card slot. Sprint says the SIM card is unlocked for both voice and data use, which means that you can either use the Sprint-supplied SIM card that ships with the phone, or buy a local SIM card while traveling abroad.
The Sprint SIM card is not unlocked for use on a domestic GSM network. The company makes a point of noting that the BlackBerry 8830 will operate only on the Sprint network in the United States, not over a GSM network.
In addition to the GSM card for international use, Sprint supplies an international charger. This nice touch means that, if you don't already have one, you won't have to go hunting around at your local electronics store for a power plug adaptor.