France is one of the more expensive countries for mobile rates. Still, for around 20 Euro you can get a useful package with an hour of call minutes and 200MB of data.
Orange is a French based multi-national mobile provider and is the leading brand of France Telecom. The British based Virgin brand is also big in this market. Other, smaller, providers are SFR and Bouyages.
The supermarket chain Carrefour (they’re everywhere in France) re-sells Virgin mobiles and SIM cards.
You can top-up your account at any Tabac (tobacconist). about 6 years ago