According to Apple LTE compatibility website (https://www.apple.com/iphone/LTE/), Model A1586 is a truly global phone as it supports all 20 LTE bands (FDD and TDD bands) I see that in Hong Kong, it is selling unlocked version of A1586. Is that factory unloced? What if I bought unlocked A1586 iPhone 6 from Hong Kong, will it work in US? I don't really care for Sprint as it is listed as supported network. I know for a fact that Sprint will not allow to bring that phone in as it is their company policy. However I do want to use the phone in other GSM/UMTS/LTE network in US like on AT&T or T-Mobile. Basically I'm looking for a phone that is truly factory unlocked and A1586 seems to be the best one to get as it support CDMA, GSM/UMTS and LTE (TDD/FDD). Any help is appreciated.