As we see on this Apple's official page, GSM models of iPhone 5 are built to support LTE bands 1, 3, 4, 5, and 17. I called a local Apple Store to have a clarification on which LTE bands are supported on an Apple-unlocked GSM iPhone 5. I was told that the Apple-unlocked iPhone 5 sold in the U.S. supports only those LTE bands used by official domestic GSM carriers, that is, AT&T as of December 8, 2012. This means that the Apple-unlocked iPhone 5 does NOT support LTE bands 1, 3, and 5 used by carriers outside of the U.S. As I stated earlier, GSM models of iPhone 5 are built to support LTE bands 1, 3, 4, 5, and 17. So, if I was to purchase a GSM iPhone 5 that is carrier-locked to AT&T at a FULL price to avoid a 2-yr contract and have this AT&T iPhone 5 IMEI-unlocked by a 3rd-party vendor, would this unlocked iPhone 5 support ALL of the LTE bands 1, 3, 4, 5, and 17?