Upload Ringtones From Computer

How would I upload existing mp3s from my computer to my phone without purchasing a bluetooth usb converter? I would like to be able to do this for free. I have read a little on it and think that I may be able to do it through sms messaging. Please help me!~

P.S. - My phone is a sanyo katana

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i know a site that does this with wallpapers, there must be one for songs

if not, i'll put one up myself Hidden Content