Motorola

I have a i530 first on Nextel, now Sprint/Nextel. I would like a mechanical ringtone and Spring/Nextel just bleats that they can't help me and even if I found on on a 3rd party site - which I have - it's unlikely that it would work because it can't be downloaded to the phone. I don't know much about it, but it seems there has to be a way. This phone evidently requires a polyphonic ringtone.

Any assistance, anyone? Thanks