My current, humble, portable rig. That's an E17 underneath the ipod. Upgrades pending! I was unable to use the FiiO straps that came with the E17 because my sammich' is too flat, and i had to find some rubberbands in the kitchen
No you can't. The samsung galaxy s3 is one of the few phones out there with a robust enough usb implementation to use external DACs that haven't been licensed or what not, like the VAMP, HP-P1, and CLAS in the case of apple products.