According to Bug 989198 and the Mozilla wiki, we can use the phone's hardware buttons to change the volume.
This works only in v2.2 and later, so I suggest we find a hack (method) to hide the volume up/volume down buttons in newer versions, but keep them for older phones.
When tackling this bug, it would make sense to also touch issue #6 (providing visual feedback for volume changes)
According to Bug 989198 and the Mozilla wiki, we can use the phone's hardware buttons to change the volume.
This works only in v2.2 and later, so I suggest we find a hack (method) to hide the volume up/volume down buttons in newer versions, but keep them for older phones.
When tackling this bug, it would make sense to also touch issue #6 (providing visual feedback for volume changes)