Sprint's Galaxy S6 got Marshmallow in March. Verizon's did the same at the start of this month. Over a week later, T-Mobile had followed suit. But what about AT&T?
Read MoreSprint's Galaxy S6 got Marshmallow in March. Verizon's did the same at the start of this month. Over a week later, T-Mobile had followed suit. But what about AT&T?
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