Font support on different platforms

Hi, I'm writing a project in which I will encounter different languages (Japanese, Chinese, Russian, etc..). Using the 3D text mesh in Unity, I saw that all characters I needed was supported by the Arial default font, and are working in editor. My question is that in the case I'm publishing the project to iOS/Android, will the Arial font still be used? does Unity save and use Arial in the project or get it from the OS? is there a way to use the current system's default font instead of a predetermined font? In short, will all the characters work on other platforms other than PC? Any help or further info on the matter is highly appreciated :)