Hi Effendi,
Thank you for your answer.
I have not clearly enough explained my wish.
I would prefer not to buy a new simcard. I am looking for a card with a "free" number that you call and then you compose the number that you want to call. Somethink like the cards that you can find on
http://www.planetacard.ch
The biggest trouble with those cards is that their validity is quite short.
Fab