Interesting. If you have some informative links on this please share. So what happens if you try to use an international phone on US networks that isn't tested by the carrier. Do the carriers care? Also, on a related note, not long ago I spoke to a representative of a phone manufacturer who said that some international phones, although their specs say LTE should work with a carrier, may only work temporarily as this capability can be disabled and then you will be limited to 2G. When talking to this person, I couldn't figure out if the phone shuts LTE down or if the carrier did this. Does this make sense to anyone?