Exam.net can be used in what we call "browser mode" on all kinds of devices (also Android) as long as they have a modern and updated browser (for example, Google Chrome) installed.

See this page for more information about cheat protection in browser mode

The high-security mode (complete lock-down) is currently available for Chromebook, Windows, MacOS, and iOS but not for Linux or Android. It is, however, something we want to investigate in the future.