You've searched all over for the authentic sound, but come up empty. Well, now you've found it. Recorded directly from the Kim Possible TV show, here's the Kimmunicator!
I've added about 10 seconds of silence at the end of the sound, so if you use it as a phone call ringtone, it won't play repeatedly.
If your phone can't play recorded audio files, you can also download a zip file of MIDI files that imitate the Kimmunicator with different MIDI instruments.
You can download the files from here, and upload to your phone as you wish. Just choose the format you want.
Making the ringer and this web site was fun. If you have any questions or ideas, just e-mail me.