Now you can make free international calls with their official website for a period of 30 days. You can go with this special link of their website. All you have to do is sign up to your account or make a new account and enter your payment details. You can add your Credit Card or Paypal information, they won't charge you anything. And complete the sign up process. Now your skype premium is activated. You can cancel your subscription anytime and your premium service will be continue for 30 days.
You can call both cellphone and land-line numbers and you can make a call to various countries including Australia, Argentina, France, Japan, Germany, New Zealand, Poland, Russia, United Kingdom and Switzerland etc.