Do I have to have a memory chip to put music on my Blackjack II?

your handset supports windows media player 10 and has an internal (inside the phone) memory of 155 MB, but I would still use a memory card. It ensures that if something happens to your phone, or you upgrade you can put your memory card into another phone usually without any problems. As far as music I'm not sure what formats, if your phone is Windows Media player, then I'm guessing WMA files and MP3 for sure. You can find more info on your phone and other phones at www.phonescoop.com.