> I still rather suspect that rather than put in a high-quality DAC and a
> low-quality DAC, they'll just not bother with the high-quality one at all.

And then your MP3s sound like phone conversations .... ummm I doubt it. 
  IIRC phone conversations are up to 3.4 kHz or something, whilst MP3s 
are usually up to 20 kHz or so.  As a very simple solution you could 
just run the same DAC at a slower clock rate for the voice calls to save 
power, but I bet there are far more sophisticated solutions actually 
used in the handsets.

>> The transmitter should be on almost zero power whilst playing music
>
> I don't know that much about GSM, but doesn't it have to periodically
> broadcast to keep in touch with the network?

Hence "almost" zero, and not actually zero.

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