I'm looking to get an s5 for use in north america. My sim card is using AT&T towers. I want a bootloader that allows unlocking using "fastboot oem unlock" or a similar command; no workarounds like loki. I will be buying outright, not carrier subsidizing for 2 years. Given these criteria, which model numbers should I be considering?
I've heard that the t-mobile one has the unlockable bootloader. Does it support all the bands to use AT&T towers?
I've seen more than one model number for international units. Are all the bootloaders unlockable? What's the deal with the region-locking? Will some of them work better for me than the others?