No. InnROOM movies may only be viewed when you are on a hotel property.
Movies may be viewed for 24 hours from the time of purchase. After that, movies will be logged in your history as purchased, but unable to be viewed again without a purchase.
That depends. Free is the best price, however sometimes free internet is a bit slow. Your Cellular internet may be a good choice, however you may incur fees for using large amounts of bandwidth required to watch the movie (1-6 GB).
That depends upon you and the hotel. Internet in hotels may be free or paid access. Data access used on your phone may be limited, or may be an extra charge.