Truetones, or Realtones, are short music or voice clips from published music. To play Truetones, your phone must support their larger files and media types. Before buying a Truetone, check that your phone can download MP3, AMR, AWB, or WAV files.
Polytones (polyphonic ringtones) use a tone generator on the phone. They are electronic reproductions of the actual music. Most phones come with several Polytones to use as ringtones.