Forgive me, I don't know much about cell phone technology. I'm a longtime Verizon customer looking to get an iPhone (although I may wait until the iPhone 5 comes out). I haven't left the country in a long time, since before I had a cell phone, but I'm planning on doing A LOT of international travel in the next two years. Most international carriers use GSM, not CDMA, correct? What are the implications involving international travel with a Verizon iPhone? On AT&T don't you just get them to unlock it and then swap the SIM card? CDMA doesn't use SIM cards, correct? What about LTE, for that matter? (I'm hoping that the iPhone 5 supports LTE). Does LTE work internationally? Thanks.