You also need to add the following module to your Application:
In the [install-dir]/conf/[application]/Application.xml file, make the following additional modifications:
Add the following module to the end of the <Modules> container:
This will add CEA-608 captions so that iOS, and similar devices can display them.
This article describes how to enabled WebVTT captions for live streaming, which will
also display on iOS 6.0, and greater, devices
Android support for live captions is still limited, but as of 4.4 WebVTT is supposed to be supported, so the above may have a chance of working for Android as well.