[en] Mobile sound formats

So I downloaded a sound clip (in .amr format) from a Nokia 6230i phone and expected to be able to play it on my pc. Great was my dissapointment when this was not the case.
Having surfed around for a free converter I found Mobile AMR converter which is able to perform amr to wav, but not to mp3. This sufficient though, as a further conversion can be performed with for instance Audacity .