Recommended File Size: No limitation. Depends on memory available
Available Sound Properties
Follow technical specifications outlined above.
Design Guidelines
Since ring tones need to be at a consistent audible level, compressing the original content to reduce the peak-to-average ratio is necessary. After the audio is compressed it is advisable to re-normalize the audio to 0db before saving the compressed MP3 file.
Note 6: Ring tones are generally between 15-20 seconds in length. Based on the recommended bit rates that would yield a file size between 75-150K per tone. It is advisable to keep file size beneath 100K to allow the end-user to download multiple tones, but there is no file size limit except for total free memory available on the device.