I'll be in France early next month as well and would like to better understand 3G SIM options. I don't care about voice or text so much as data. I'd like to be able to call restaurants and such if needed, but I'm mainly after data. Lebara seems to be geared more towards recent immigrants who want to call home for cheap - its data options seem pretty spendy.

I've heard good things about SFR, and their La Carte seems to fit the bill if they can get me a micro SIM. Has anyone used SFR with an iPhone?