I guess thats an app for finding WiFi in France?
In my experience in France, Wifi is similar to here - finding end users with open wifi is rare now. There are lots of "unencrypted" Orange wifi access points, but you need to subscribe to most, similar to BT Wifi/Openzone, as these are home routers with Fon style public access.
On our last trip, the villa's wifi was down, so we found ourselves drinking McDonalds coffee a lot 
Option 2, if you're taking the pikey wagon over, and want it in the van whilst serving kebabs to the public, get a MiFi, and buy a French data SIM for the week/fornight.
My Nexus 7 doesn't take a SIM card.
Thats why you need the MiFi - the SIM goes in this, and you connect to MiFi from Nexus via WiFi. I use, I think, Huawei E586, which was the one I shared out at Newent last year.
Ah! I see and understand (wish I was clever like you
).
Seems an expensive way to get WiFi though, most campsites provide free WiFi, or for a small charge, unless you go to a caravan club site.
Depends if you are pitched up near enough to receive WiFi from the campsite's one (if they have one).
I bought my WiFi for when the TB family all go to Cyprus. I get a local SIM, €15 for 1 week, max 500Mb, and pop it in the MiFi, which then just gets left in the lounge of the villa. Anyone can then just connect to it (though it has a limit of 5 concurrent devices on my one). Yes, most of the resturants have free WiFi, but its a long way for the teenagers to walk, just to update arsebook.