This is where VoIP comes free, and this is where VoIP has the most users worldwide. There is no restriction on location or country and no additional device is needed. All you need is a computer with an Internet connection of sufficient bandwidth. Then, you need to choose a PC-based VoIP service and download and install its application (called a softphone). You can then use your headset to make and receive calls. The most popular example is Skype which, at the time I am writing this, counts 350 million users worldwide.
Many people have been using computer-based VoIP for years and have made and received thousands of local and international PC-to-PC calls without ever paying a dime for it. Downloading and registering for the service is free, and as long as the communication is between users of the same service, the calls are also free and unlimited. Charges apply only when making calls to or receiving calls from landline or mobile users, through traditional PSTN or GSM networks.
This is the most preferred and accessible way of using VoIP. Here is a list of the most popular software-based VoIP services you can use on your computer for free calls.
