Been told there is a scam going round --
Your phone rings and you are informed that you've won a holiday in some exotic place, and to hear further detials to press 9 on your telephone keypad. At which your phone re-connects to a premium site at £20 per minute. Even if you disconnect immediately the call will still go on for 5 minutes, so if you get one of these calls hang up straight away.

As far as I know this applies in the UK but may well spread further...

Peter