A:AnswerYou can cast video from android phone or tablet as if it was a chromecast. You don't need an special app for it; once you click cast on your phone or table, Roku will appear as an option.
A:AnswerThis is how I've been using mine since January with no issues. Mine is powered by a USB port on my TV that turns off and on with the TV. If there's a problem with this, I've not encountered it
A:AnswerYou have to provide a credit card to Sling when you register for the free trial. They won’t charge you if you cancel before the trial ends. When you go to Sling website they explain the packages and prices that will apply after the 30 day trial and you can choose which one you want. I tried for 21 days and didn’t think it was for me, so I canceled and was not charged