I can’t speak for iOS, making a HTML5 build should work on all devices. In the armory exporter set the graphics to “mobile”.
A native android build may also be what you are after;
To export for mobile go to the
Armory Exporter > Target > Android
Build, then Publish.
You will need to download Android Studio to then make an apk for your project to work on your android phone.
In your file browser directory a build of your game will be in a new folder within your blender file’s directory. The “android-native-build” folder contains the file that Android Studio can run a build of.
While you have Android Studio running it will prompt you to download a number of updates and packages in order to make a build of your work. Plug your phone into your PC and good luck compiling.