I have an AT&T Galaxy S5 that I bought unlocked from Pure Talk to use with my free Safelink account and it upgraded itself to 6.01 the day I got it. I've never to AT&T but it seems to still get updates from them.
Since then I've gotten several security updates.
For what it's worth it's a nice phone. I replaced my Nexus 5 with it because I needed better battery life. The Nexus 5 was a plain vanilla Android phone, which I much prefer, but this has been good and reliable and gave me what I needed.
With it's AMOLED screen it's also quite a bit nicer for reading. I've been reading quite a bit on it.
Barry
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