Yeah, I'd recomend either 128kbps or 112kbps to keep file size to a minimum. I doubt you have more than about 80Mb on your phone to fill with music, so if you wanna cram as much on as your can then you will need to use lower bit rates. Obviously you lose quality the lower you go though. With 128kbps you'll probably be able to fit around 20 four minute songs into 80Mb free space on your phone.