Way back I created ringing tones of the Japanese Opening and Ending Themes for use with SAMSUNG cellphones. You can download them here:

Fushigi, CALL ME
Yume Ginga (Galactic Dream)

Actually these files can be uploaded to any cellphone supporting *.gsm files. The music is based upon the original music sheets by Pony Canyon, MIO.
The ringing tone for the Saber Rider and The Star Sheriffs-Theme (optimized for NOKIA and SIEMENS) can be found at Yuma City.