The MMS attachment (an .amr file) can be found in a folder in ~/.local/share/commhistory/data. But it cannot be played. The error message is: Unsupported codec Adaptive Multi-Rate (AMR). Clearly, SFOS doesn’t have a codec to play an .amr file…
I was only able to manually open it in VLC (an Android media player) where it was played back just fine.I’ve uploaded a sample .amr MMS attachment here:
Sample .amr file that SFOS can’t play, extracted from MMS message: