Although the dimensions of the 16:9 is considered the standard for television, only that there is more content 21:9 is entirely appropriate for new Xperia that Sony launched this year such as the Xperia 1 and Xperia 10 and Xperia 10 Plus.
Filmed two-thirds of the movies Netflix the original with dimensions of 21:9, and examples include modern Birdbox and Mowgli: The Legend of the Jungle. However, the submission of most of the original TV series dimensions 18:9. In the case if you are a participant in the service Amazon Prime Video instead of that, there are films like Venom and Arrival which are used to dimensions of 21:9. As for the Google Play Store, it also houses several movies used the dimensions of the 21:9 include the likes of Black Panther and Fantastic Four: The Fallen Kingdom.
Apart from that, we would like to point out that Netflix different plans for mobile devices the cost of 0.95 $ only per month in India and Malaysia. These plans are valid for one device for a week and broadcasting content in SD resolution. There are better plans to allow streaming content at higher resolutions available with 1.8$ 2.3$ 2.8$ per week.
By the way, you can check out the list of movies that used the dimensions of the 21:9 sorted by rating IMDB from here with the knowledge that the list is a Google document Sheets.