High phone bills will be a thing of the past. Enjoy talking to members on your Yahoo! friends list for as long as you want – it’s free! When you call anyone else it only costs 1.2 cents/minute.

Yahoo! will not charge you for Yahoo! Messenger PC to PC Internet calling. Your Internet Service Provider, however, may charge fees for the internet access. Calls to traditional phones will be charged by Yahoo! as per the current price list.
All you need is the Gigaset S450 Y + M34 USB.

If you want to find out more: Gigaset S450 Y + M34 USB Special