Not sure. I haven't ventured in that field yet... Is it something to do with resale rights? I want in.
what it is is you get a site with your design etc.. so instead of just having a landing page it is literally hosted thru your url not just a redirect etc.. this is very useful!!!! as it literally is just like it is your site. you usually already have to have some great convert numbers before a network will give oyu a white label.
The word you are missing from the term is 'content' White label ringtone content is just that - content that you can add into an existing website, or build a good site around this content. Mediaplazza is indeed a good example, and I myself use the content they provide. I found out long ago that using their content alone was not good enough and that I needed to build a good site around their content. Its not a quick solution, and like anything needs plenty of work before you get lots of people downloading your ringtones, but when it happens, you get all the more satisfaction for it!