you cannot use full mp3's as ringers. They must be cut down to around 30 seconds or so, and then sent to your phone.

Please check the forum as this has been covered a lot of times already.

so i got the lg fusic the other day and i like the phone but it doesn't allow me to use my own music from my computer as ringers. it lets me use the songs in the media player but not as ringers. does anyone know of a program that lets you use your music as a ringer rather than having to buy them from sprint. please hlep. thanks