I had perhaps better step in before any more misinformation goes on in this thread.
YES the Galaxy S3 can work with a USB DAC/amp combo using the external DAC. No "crazy wires", just a USB OTG adapter (which can be purchased for a couple of bucks or so). Check the Portable Sources forum in the "Android phones and USB audio" thread to see the dozens of USB DACs and DAC/amp combos that are confirmed with the S3. I personally use the Apex Glacier, RSA Intruder, Leckerton UHA-6S.MKII and HeadAmp Pico DAC/amp with mine (and previously the E7 also).
As mentioned, there is no line out on the S3 (apart from out of the desktop dock). If you just get an amp you will be double-amping the S3 (I have no opinion on whether that it is a good, bad, or indifferent thing).
Please people, a little fact checking before posting doesn't hurt - there are hundreds of posts about this here at Head-Fi.
Edited by NZtechfreak - 1/21/13 at 12:09am