A subscription is a pay-monthly plan that lets you make minute-limited or unlimited* calls to selected countries, so it’s perfect if you want to make a lot of calls. Monthly subscriptions offer the best value for calling landlines and mobiles from Skype - you'll save up to 60% off our standard calling rates.
                      Skype Credit allows 
                        you to pay as you go. You can call whoever you want, whenever 
                        you want, at very low rates, as well as purchase other 
                        products and features from Skype.
                      You can have both a subscription and Skype Credit – that way you can use Skype 
                        Credit to pay for calls to other countries and mobile 
                        phones that are not covered by your subscription; send 
                        text messages
                      *A fair usage policy applies to unlimited subscriptions.