Us cellular Ring times/bluetooth

alright soo i got a Nokia 6255i with us cellular...and i think it only takes polyphonic ring tones witch sucks..but i have bluetooth on it. and when i conncet to another phone via bluetooth and downloand and attempt to use it as a ringtime it says it isnt in the right format.....when i record a sound i cant use it as a ringtone either...is their anyway i can get these files in the right format.. and or is there any way i can download ring tones. other than uscellulars internet (easyedge) ..? help plz its really pissing me off i have been on the net for like 4 hours trying to search this....