I am trying to call a friend in France.. Our operator for long distant calls are 21, so i dialed:

00 21 33 6 xxxx-xxxx

is it right?

21 00 33 6 xxxxxxx

00 33 XX XX ...

0021 + 33 + zone number (1 to 5, 6 for mobile phones, 7 for recent operators... ) + the 8 digits of the phone number. No intermediate dialing tone, because the modern switchboards do not need it anymore (they can buffer and forward dialed digits).

If the phone number begins by 01, 02... 07..., just forget that leading 0.