SIM cards can be bought at the airport in France, but they are not cheap. After the first few minutes, you may be paying high rates to call India
Document required for buying SIM
You will need to show a photo ID at point of purchase to activate SIM cards in France, as it is a legal requirement. A passport usually suffices.
SIM cards are available in tobacco shops, Relay shops, SFR stores or Orange store. SIM cards are also available at Charles De Gaulle Airport.
There is a facility of online top-ups your sim card from provider’s website, such as Orange. Alternatively you can buy a voucher in an Orange shop, any tobacco shop or supermarket.