It’s quite clear from the name about what the app does. The app allows you to randomize your ringtones on your iPhone. However, you can only select those ringtones which you have added via itunes to your iPhone as it only works with them. You also have a bossprefs toggle via cydia if you want to use that utility.
NOTE: For some minutes, the package had an issue and was installing a ringtone called RandomRing into /Library/Ringtones but the application manage only ringtones installed and synced by iTunes in the ringtone section… so when you install the ringtone downloaded from the link posted before you will see 2 RandomRing : one will work as random and one not 🙁
You can delete the file manually /Library/Ringtones/Randomring.m4r (iPhone Browser can be used for this).
Search for ’RandomRing’ on cydia
Cydia brings cool apps on Jailbroken iPhone 2.x… Info here