Here are some free VoIP providers give you free calls to your desired destinations:
Skype : Skype is a reputable VoIP service that, when used a specific way, will be completely free to you. The software is easy to download, and talking to any other Skype user is free. Rest assured that there are plenty of Skype users out there, too, as it is currently the most popular VoIP service. If someone you call frequently doesn’t use Skype, you can merely send him/her the link to easily download the software. Long distance phone calls to your family and friends in another state, for instance, will at once be pain-free for both you and them. A professional site and customer service, in addition to clear sound, makes this a legitimate winner for most.
Raketu : Raketu is a trendy site, combining state-of-the-art communications. Free VoIP calls can be made to landlines and mobile phones in many countries, which is very impressive. Also, features like live stream television allows for people to chat with their friends about what they are watching together.
VoIPCheap : VoIPCheap should be more appropriately titled “VoipFREE”. VoipCheap allows you to make free phone calls to regular phone lines. This free service also includes many other countries, not just USA and Canada. The software is free to download and simple to start using right away, provided you have a headset or phone ready to plug in.
Gizmo : Gizmo offers free software and free VoIP calls to all other Gizmo users. The interface is very user-friendly and the company claims it “is as simple as instant messaging”. A bonus to this service is the “All Calls Free” plan, which states that Gizmo users can call other Gizmo users’ landlines and mobile phones, not just their computers.
Windows Live Messenger : PC-to-PC calls are always free when made between those who have MSN Messenger installed. VoIP novices may feel more comfortable with a provider like Windows, as the conglomerate is more likely to offer round-the-clock customer service should any problems arise. Also, the interface will look and feel familiar to long time Windows aficionados.
Yahoo! Voice : This is a simple and free PC-to-PC calling software. Similarly, the free calls must be made to other active Yahoo! Voice members. Those who are already familiar with the regular Yahoo! Instant Messenger system should feel right at home with the application. Since there are already so many Yahoo! IM users, this may be a great place to begin experimenting with VoIP technology.
Google Talk : Another PC-to-PC application that is free to use for fellow members, Google Talk offers a very polished and user-friendly interface. BlackBerry addicts will be happy to know that Google Talk is available for free on their handheld lifelines. Also, the newly introduced Google Talk Gadget offers fun tools like YouTube interaction between chatting friends.
Internetcalls : Internetcalls is a popular VoIP alternative to services like VoipCheap, although they are practically identical. Like VoipCheap, all calls are free to most destinations. Also, the service is now boasting improved sound quality, which is a relief to those wishing to use it for business purposes.
Wengo Phone : WengoPhone intends to circumvent any restrictions. Their software allows for users to make free PC-to-PC calls to anyone else with compliant software, no matter who their VoIP provider. This is a very subversive program and many tech-savvy folks are very happy with it.