Forget about the Kyocera 7135 software in downloading MP3 files. It just plain sucks. Buy a card reader (very cheap) and download files to a card. Even then, the player software on the phone is not that great. One out of every five songs just won't play or skip.
With MP3 files from EMusic, loaded using Kyocera's loading program under XP, the MP3 player provides sound that is kind of jerky, dropping in and out. The same files work fine using RealPlayer 10 on my laptop. Suggestions???