I keep reading that the sprint/factory unlocked iphones support the most bands and frequencies, and will work in any supported network that an iPhone will work on in the world. So does this make them the most valuable? I would assume so no? I just sold my launch day 6 and paid retail for a 6+ unlocked phone from apple. I know about the VoLTE issue with the factory unlocked phones not working, but is there any upside to having this version? All i can see is that they are going to be worth more in resale, even more than the T-mobile ones I read. Read here.
http://www.techwalls.com/differences-between-iphone-6-6-plus-models/
http://www.techwalls.com/differences-between-iphone-6-6-plus-models/