Have you looked at
Low-cost Europe cell phones and European SIM cards they have a data plan for France. I have never used them as I think they are to expensive. Make sure you look at the T&C as there is a I think a $60.00 fee per year. That is why i would never use them. Never hurts to give them a look.
[size=1]Prepaid cards, Moldova Tempo, Kyrg Republic BiTel, India Hutch, Bulgaria Mtel, Vodafone, UK. Etisalat. UAE. Afghan Wireless, Afghanistan. Three, UK. T-mobile post-paid.
Phones Gsm Iphone6+