The indexing program doesn't run on mobile devices. For a short time a few years ago there was a mobile app for indexing that was being tested on Android and iOS, but it was discontinued because its features were minimal and it didn't produce quality results. FamilySearch is in the process of creating a new, browser-based indexing experience that will work on any device with a modern browser, but it's not available yet except for internal testing and a beta that uses test data.
Samuel Bradshaw • If you desire to serve God, you are called to the work.