After a long and mostly fruitless search for a downloadable version of the Global Frequency ringtone, “hangfire snausage” was kind enough to share with me via email his MP3 of it, with the encouragement to spread it around. So for those phones that can play an MP3 ringtone, here it is:
Global Frequency ringtone (MP3, 12 kbytes)
Note: You may need to Right-Click on the link and choose Save As… to get it to download, instead of playing in your browser.
Another Note: I cannot help you install this on your phone, so hopefully you can figure that out on your own.