There's no difference between calling cards and Calleasy. As with virtual calling cards, you register your number and then you call an access number.

When calleasy doesn't recognise your number, you'll be asked for your personal code which you have received when you registered. This can be found in your account.

The advantage of Calleasy is how simple it is to add credits to your account everytime whereas for calling cards, you have to purchase a new card every time it runs out of credits.