I am just trying to get the "MP3" player to work using the SD card. I have the same phone and I use sandisk. My (MP3) music files are on my mini SD card but when I put it into my phone it says no music files are found.
MP3 is easy, try repluging your card in (it doesnt work sometimes when you plug it in). If that doesnt work, check to see if your MP3s are stored in the MP3 folder, otherwise the phone won't read your MP3s.