8320 - 64mb memory, no video recording, 4gb max external media card support no streaming video, WiFi no GPS, GSM, and UMA (VoIP)
8330 - 96mb memory, video recording, 8gb max external media card support, streaming video, no WiFi, GPS, CDMA


unlocking a CDMA device is near impossible and your 8330 wont work overseas in most places. there is no SIM card, so you would have to purchase a local SIM overseas, this means no UMA (VoIP) so you would be charged minutes. You need a Tmo branded phone and Tmo plan, or Orange branded phone and an Orange plan, or Rogers/Fido branded phone and a Rogers/Fido plan (all these plans must have the unlimited VoIP calls) for you to be able to get the free international calling via WiFi. Simply having the device wont allow this