I recently made some self-produced ringtones available for iPhone and Android SmartPhones via Tuunes.co/Artists/MaBo
The process was very easy using SnipSell.com as aggregator, and their tech support has been very quick and helpful to answer my questions. I am not advertising SnipSell for any reason other than the comfortable process of submitting my ringtones.
I have been told a few times that people were unable to preview my ringtones; this is why I would like to clarify this process here.
Markus' bilinguale Website - manche Sachen auf Englisch, some in German 