The reason for Fallout Shelter’s success is cost. This app is free. That means if you want to play it, all you have to do is click the “download” button. The only thing that isn’t free in the game is lunch boxes, which contain random items. It’s also successful thanks to Fallout’s loyal fan base.  

(Courtesy of phandroid.com)

A New Beginning? 

Since Fallout Shelter is so successful, this could lead to a potential mobile app series for Bethesda. You can expect more updates, items, and creation options as the game continues, and if they create a sequel in the future, expect even more.

With the game breaking even more boundaries, the only question is what will Bethesda do next?