A:AnswerThe TV's refresh rate is 60hz. But, Samsung has some clever post processing software installed that gives the illusion of 120hz called "Motion Rate 120"
A:AnswerUse the remote, that how I set it up because do have a phone compatible but I didn't want to download the app. When you first turn TV on it shows you that you can use the remote also.
A:AnswerYes, any TV should automatically worked, since that is driven by the console, and not the TV. Also note, 4k TVs will still display lower resolution sources (like cable, or blu-ray players), and usually they up-convert the content