Coding Workshop Ringtone Converter allows you to add new ringtones to your mobile phone without the need for cables The Ringtone Converter is a tool designed for both Microsoft Windows and Apple Mac systems that allows you to add new ringtones to your mobile phone without the need for cables or expensive premium rate SMS services.
The Ringtone Converter supports most makes and models of phone including
audiovox, Alcatel, Ericsson, HTC, Kyocera, Motorola, Nokia, NEC, Panasonic, Philips, Sagem, Samsung, Sony, Sendo, Sharp and Siemens handsets, with more added every month.
Limitations:
nag screen
It only converts some ringtones to a key sequence (one ringtone per phone model)
MP4 Converter
6.31 MB 
$ 18.95