This Skype method of checking balance cc works only in the UK and USA only.
First you need to buy a card .
If there is no bank in the card you bought, then use the Bin Checker, there you can find out all the information about the bank.
For example, take bin 546097 check the bank and get CAPITAL ONE (EUROPE) PLC.
Now go to Google and look for the bank number +-800-935-9935
Call this number from Skype for free, then the robot will ask you some information about the map.
After you enter the information, the robot will tell you the balance.