In answer to the original question, If your Phone has an SD card inside it, then the B&M system will not connect your phone via USB. Reason being is that it see's it as 2 USB drives like your PC would (internal and external SD storage), and cannot decide which to access and catalog for playback.
Even without an SD card inserted in your phone, compatibility is a bit flakey.
Best just to pop your tunes on a USB stick and play them from that.