Limitations of Free VoIP

The totally free VoIP service has certain limitations:

You can talk free only with those people who are using the same downloadable voip software as you. This is one downside of free pc-to-pc VoIP. To overcome this problem, some VoIP providers have peer to peer arrangements with other specific providers by which you can call users of other VoIP providers. But this arrangement is not universal yet.

Another thing with pc-to-pc free VoIP is that the person whom you call should be online when you make the call - this means that you may not be able to reach the other person any time you want as you can do with a regular telephone. This is the main disadvantage of free pc-to-pc VoIP.

And naturally you cannot call someone who doesn't have a computer.

Here is where Softphone (PC-to-Phone) and Internet Phone (Phone-to-Phone) VoIP comes to your aid.
With these you can talk to anybody with a regular telephone anytime you want. And they are almost free compared to what you are used to paying for the use of your traditional phone.

Near zero cost of Internet Phones is enough to make them attractive any day but most have other features that are even far more attractive and which no traditional phone can provide. This is the reason of the growing popularity of VoIP.