Hello drublu - we're sorry, Firefox OS doesn't have the ability to use custom ringtones yet. But Mozilla's developers are aware that this is a much wanted & requested feature and there is already work ongoing to implement it (scheduled to land in Firefox OS 1.3). two sources on the issue: <br>http://blog.djf.net/2013/10/custom-ringtones-for-firefoxos/ <br>https://bugzilla.mozilla.org/show_bug.cgi?id=878057 For current ringer and other sound settings, see [[Change ringer, sound and vibration settings]].