I currently have the 16GB iPhone 3G and will be studying abroad in Hong Kong for the fall semester (approximately Sept-Dec). If I jailbreak and unlock, I should be able to stick in a prepaid sim card bought in HK and will work flawlessly, right? What about text messaging, just buy one of those free SMS apps? I checked with AT&T and the roaming and data charges are just not worth it. Another thing, I'm eligible for an upgrade, which is weird considering I upgraded last year. Do you think I should upgrade to the 3Gs, even though I'll be gone for 4 months? I probably won't be on a data plan abroad, just WiFi, so I should still be able to benefit from the faster speeds I'm think. Any other benefits to upgrading? If I sell my current iPhone for ~300-350, then i should be up at least 100 right? Any other opinions on my situation is greatly appreciated. I really can't imagine using another phone, so I'd like to be able to use my iPhone instead of purchasing an unlocked phone.