To use external DAC with any Android smartphone, you need (1) a version of the firmware that has USB-OTG driver built into it. Most don't since USB-OTG isn't part of standard Android driver yet. Highly doubt Sony Ericsson has it since it is an older model. (2) the smartphone itself need to has the proper USB-OTG chip inside, not just software. and (3) the external DAC needs to draw minimum power as most smartphone can't supply more than 100mA~150mA.