The actual answer is yes and no. My T-Mobile branded Note 8 had RCS in the default messaging app but it only worked with other T-Mobile branded Samsung phones. All carrier branded Samsung phones support it, not all carriers have it enabled. And it only works on carrier branded phones within the same carrier. IE, it doesn't work T-Mobile to AT&T or any other 2 different carriers. Unlocked devices also cannot use these features because they aren't locked to any carrier.