Transfer it to iTunes using PC so you can control it in your headset
Unlike ANDROIDS when you download crack MP3 on it it goes to ANDROID PLAYER no need to transfer shit
I dont know how dTunes developer miss that download folder should be directed to the iPhone's iPod player instead of having their own player, may be it's hard or they tried but no luck, but I'm pretty sure it's 100% it can be done, remember dTunes for JailBroke only so it can be done Hope they Update
what generation do u have?
i think its called mewseek pro or something like that (inside cydia) which lets u download music and has a transfer, the transfer works, but not for 3G and i believe 3GS