AT&T expected to push Android 7.0 Nougat to Galaxy S7 edge units in "early Spring"
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On top of that, the South Korean company only made it available in those countries where the beta program was enabled, which means Galaxy S7/S7 edge owners in China and the UK are the only ones that can download Android 7.0 Nougat on their smartphones.
The information has been recently confirmed by an AT&T rep, who said that the carrier is already testing the beta and estimates that a final build could be rolled out in March or even April.
Obviously, AT&T's plans can change anytime and Galaxy S7/S7 edge owners could receive the update much earlier, but based on past experiences, the carrier doesn't usually releases major Android updates until after the market launch of the next Galaxy S flagship, or around that time.
Things that are NOT allowed: