Mp3 Ringtones Ntelos

Mp3 files and LG 380?

So, I recently got my new LG 380 cellphone through the service of nTelos. I love it so far. But, the only thing that I can’t figure out is how to set my mp3′s as ringtones. I bought a micro SD card to fit inside, and coppied the music that I wanted to both ‘music’ files and the ‘other sounds’ file. When I try to set is as a ringtone, it says that I need to copy the song to the phone memory. My phone has insufficient memory to hold the songs…
Is there any possible way to set my mp3′s as ringtones, or is this phone just incapable of such a deal?

Using an audio editing software (online) cut the song to a smaller length and file size and then copy it to the card to move in to the phone memory and that should work but if it still doesn;t then try converting the song to .mid format and see if it works.