You mean this? http://mobile.free.fr/ I think your French is a little rusty, and those plans end up being a ton more expensive when all is said and done.
What's the catch? Can't we get a mobile plan for only 2 euros/month?
In any case, in the US, Ting and Family Mobile are pretty good deals.
That's not that cheap. Start at $15 for 100 minutes, 100 text and 100 MB.