Frelon - Thanks, I used do exactly the same with a NZ based operator, i.e. $10 deposit for free calls for a set period, then use up the $10 until it is time to add more money, but recently a NZ service has started whereby I insert the numbers into my computer - my number and the one I'm calling - then they call me back and only connect when I pick up, free around NZ but I pay for International calls, but the other day I didn't want to wake my wife with the call back, so used a "phonecard" and it is this that has occasionally called the wrong number.