Instructions:"Skype is all about free calls to anyone else on Skype. And you can call phones at inexpensive rates as well.
To show you how easy it is to save when calling phones from Skype were giving you an entire month of our Unlimited World subscription. It includes unlimited calls* to landlines in over 40 countries worldwide plus mobiles in some countries."
copy and paste "www.skype.com/voucher" to your browser, login in and they type the code.