Uverse TV app

I am considering signing up for Uverse TV. There is one area I want to understand and that is what Uverse TV app can do on different devices. I can call AT&T and ask support, but I know better not to do that. 1) Is there an Uverse Roku channel? If yes, does it support live broadcast and on demand? 2) Is there an Uvese app for Samsung smart TV? If yes, does it support live broadcast and on demand? 3) Does Uverse apk support output to hdmi devices (like an Android TV box)? 4) Does Uvsere app support live broadcast while on the road ( non AT&T home wifi) 5) Can you cast, mirror Uverse programing from Android cell phone or tablet? Thank you.