It's Relay for Reddit.
(I personally cannot stand that configuration, it has nowhere near enough articles on screen, but Relay is very attractive and has pretty good layout customisation actions.)
Oh cool. Thanks! Coming from an iPhone here and that app does not exist on iOS.
Speaking of......all I have to do when I get my 6P is take the sim out from the iPhone and put it in the 6P, right? It's that simple? This is my first unlocked phone.