I would like to ask actually, have you tried importing music into the phone? What format would you be using?
Depends what method you use to transfer them. If you use memory card reader it would be .mp4 format but if you using usb data cable it can transfer .mp3 from windows media player. For more info visit http://www.howardforums.com/forumdisplay.php/418-Japanese-Phones/page2?order=desc
what's the battery life like? i.e. how long do you usually get on 1 charge?
24 hrs if you on GPRS/GSM mode. Longer battery life if you put on 3G.