Data in France [merged]

[maccoy]

Originally Posted by wisniak

Where can the SFR SIM cards be purchased? eg in the airport?

Usually there are no mobile operators shops in the airports.
You can buy a sim card for data in any phone shop exposing the operator logo.

Originally Posted by wisniak

And another question, is free WIFI widely available in France?

WIFI is widely available but it isn't always free.
It is usually free in the libraries (within a limited connection time), Mcdonalds and Starbucks shops.
Elsewhere (bars) you may have to ask the waiters for acces codes.