Thanks to AdSense I just found this site... http://www.lefrenchmobile.com ... do you know it? :)

Interesting - I'd guessed Transatel even before I scrolled down the page, maybe slightly prompted by a remark someone made recently ...

it's probably pretty recent - so it starts with students ...

I have to advise you that le french mobile is not a prepaid offer...
Transatel (MVNO on Bouygues Telecom) seems to be searching new markets.
They started as a multi-country operator, covering both France and Belgium.
Now their offer includes the Netherlands and Luxemburg.
In 2006 the will extend their offer to Germany, Switzerland an the UK.