You can download trial versions of most programs but the MOBI ones will NOT let you download to your phone, however Oxygen II Phone Manager does let you download to your phone so this is probably the best program to get, by the way i have a 6100 and Oxygen II Phone Manager does let you upload midi files to your phone
i would personally recommend u to use MOBI MB, which is far better and easy to use than any other software u want to use to transfer data to ur mobile phone!!!
the latest version is 1.2.6, but i have version 1.2.5...!!!