A:AnswerSpotify, yes - provided you have wireless internet available for it to connect to.
I stream Spotify, but not Sirius XM, so I cannot confirm/deny the later.
A:AnswerUnfortunately, OLED screens can be sensitive to pressure. For the bluish marks, you can try gently cleaning the screen with a microfiber cloth and a screen-safe cleaner. If the marks persist, it might be best to contact Samsung customer support for further assistance.
A:AnswerFor open box TVs, the warranty typically includes the manufacturer's warranty, which for Samsung TVs is 12 months for screen sizes 37 inches or more. Best Buy may also offer additional protection plans that you can purchase for extra coverage. It's best to confirm with Best Buy for the most accurate and current details regarding their open box warranty policies.
A:AnswerYes, this TV has 4 HDMI ports which would allow you to connect those devices you mention. Depending on your preference, I would recommend you get a 4K capable ROKU as well as a 4K capable cable box to be able to take full advantage of the gorgeous image quality provided by this TV.
A:AnswerI have AT&T. Have had no problem with AT&T channels nor problems with streaming services. I do not play video games. My grand kids have yet to visit and pay games.