Interesting topic, considering there were some old phone games (maybe not i-mode/EZweb but they were Japanese only games) on a Mobile device I would like to see preserved for audio content. The one that comes to mind atm is the Armored Core Mobile series.
Unfortunately, I don't know of anyone that still has these and how likely are they to do a proper dump for those games. The other issue would be figuring out what is the preferred soundbank since each phone has their own unique bank.
Unrelated but is there a way to dump midi or some type of sequence data from most common android games? There's a few I had in mind but I just wanted to know if it's possible.