A:AnswerYou will need to have your phone and tv on the same network to cast to the TV. You will see like you see a chromecast for firestick on your network.
Connection is really great.
A:AnswerNope. This TV has a cheap panel and slow input. Even setting to Game mode will only eliminate a minimal amount of lag, but it's still laggy and it still makes games nearly impossible to play. I returned mine and settled for an Insignia (LG) 1080p, and I'm very happy with that for now. Low-priced 4k will not be decent for gaming for quite a while.