Nowadays more and more people like to use internet to deal with their daily issues. Their use calling cards to connect with their friends, and do business. The good news is that calling online is much cheaper than normal telephone calls. So we can save a lot of money in the long run. This is why more and more people use it.
Another good thing is that calling online is more convenient and fun, we can chat with somebody in video and words together. This is a cool thing.
I believe internet call will replace normal telephone call in the near future.