From the latimes:

“If you are a friend or relative of a passenger aboard Air France Flight 447 that went missing over the Atlantic four hours after departing Rio de Janeiro  Sunday en route to Paris-Charles de Gaulle, you can call the following toll-free numbers that Air France has set up to obtain information and find out whether or not your friend or family member was on board. Air France has also set up on-site counseling with doctors and psychologists at the airports in Paris-Charles de Gaulle 2 and Rio de Janeiro.

Phone numbers reserved for relatives and friends.

In France: 0800 800 812

In Brazil: 0800 881 20 20

and + 33 1 57 02 10 55 for calls from all other countries.”