PC-Telephone

PC-Telephone offers a downloadable client for Windows machines that is capable of placing phone calls to anywhere in the world from your PC at low phone rates. You can also receive calls on your PC, send and receive FAX documents and make free PC-to-PC calls. Other features supported by PC-Telephone are: file transfer, call waiting, call scheduling, caller ID, call transfer, call hold and many others. No SMS service nor mobile app are supported.

PC-Telephone call rates

http://www.pc-telephone.com/pc-to-phone.htm

Rebtel

Rebtel enables you to make and receive low-cost or free international calls to reach your friends. Once your register for the service, you can create an address book with the phone numbers of your friends and Rebtel will provide you with a unique local number to call each one of them. When you want to make a phone call, call the Rebtel number associated with your friend and when your friend picks up, she will be asked to call you back at the same number. The call will be routed using VoIP and you can talk for as long as you want without spending a dime. For those countries where you cannot make a free call, recharge your Rebtel credit via credit card and PayPal and manage your call spending using the web-based dashboard accessible from any web browser and operating system. Rebtel works both on mobile and landline phones and the service also supports call history and sending and receiving SMS.

Rebtel call rates

http://www.rebtel.com/

MyCallingBox

MyCallingBox is an online VoIP provider that you can utilize to make cheap phone calls from your computer. MyCallingBox requires that you use Internet Explorer only and install a small ActiveX component on your PC to get started. After registering and choosing one of the calling packages available, you will be asked to add the phone number you want to call to your personal phonebook so that you can make one-click international calls. If you prefer to use your mobile phone, you can use calling cards associated with one of the aforementioned four calling packages. No voicemail, SMS service, nor mobile application are supported.

MyCallingBox call rates

http://www.mycallingbox.com/

Miglu

Miglu allows you to make low-cost international calls using your web browser, your landline or mobile phone and instant messaging applications like GTalk. You can also send and receive SMS messages. To place a call you only have to register to the service and call a specific Miglu number. The service will then call you back and allow you to make a phone call to a number of your choice that will be routed using VoIP technology. No voicemail, nor mobile application are supported. You cannot also receive calls using Miglu.

Miglu call rates

http://www.miglu.com/

Voxtopia ***DEAD

Voxtopia allows you to use your mobile phone to call any destination in the world at a low rate or even free of charge. You can also receive calls, receive fax messages, block unwanted callers, view caller IDs, create conference calls and much more. To make a call using Voxtopia, you have to register for free with the service and you will be given a unique number that you can call to route your calls over VoIP and that your friends will call to reach you without paying the costs of a standard international telephone call. Voicemail is available and all incoming messages are sent to an email address of your choice. No SMS service is available.

***DEAD

PokeTalk

PokeTalk is a web-based service that allows you to make phone calls to any place of the world. Once your register for the service, you can make calls from the web interface, call a unique number from your mobile or landline phone and call or send an SMS to PokeTalk. No matter which solution you choose, the call will be routed through the Internet thanks to the VoIP technology. You can also use PokeTalk to send and receive SMS messages. You cannot receive calls, nor you have a voicemail and a mobile application available.

PokeTalk call rates

http://www.poketalk.com/

WebPhone

WebPhone comes to the rescue when you have to call anywhere in the world from your Windows PC. You just have to register for the service and download a dedicated software that allows you to place your phone calls using your computer. Calls among WebPhone users are always free while calls to landline or mobile international phone numbers are routed using the VoIP technology which makes them very cheap. You cannot receive calls, send and receive SMS messages, nor have a voicemail and a mobile application.

WebPhone call rates

http://www.webphone.com/

GMail

GMail, Google's email service, allows you to make and receive calls from and to many destinations around the world if you have Google Voice activated. You can call your GMail contacts or any other international number using a keyboard that pops up on your screen. You will only need to have a GMail account and to install the voice and chat plugin. The service is free for phone calls made to US and Canada through the end of 2010. No voicemail, SMS service, nor mobile application are available.

GMail call rates

http://www.google.com/chat/voice/

My-B-line

My-B-line is a free service provided by Inphonex that lets you make phone calls at low rates and even for free to any international phone from your PC using the VoIP protocol. To get started, register to the site and pay a one-time fee of $9.95. Then you will enjoy calling around the world at a cheap price in a pay-as-you-go fashion. Calls among other My-B-line users are free worldwide. No voicemail, SMS service, nor mobile application are available.

My-B-line call rates

http://www.mybline.com/

PowerVoip

PowerVoip is either a free web-based service and a downloadable software that allows you to place cheap phone calls from your PC to anywhere in the world. You just need to register to the service and then download the free softphone application for Windows, Mac and Linux, use the online interface, download the mobile application for the iPhone or Nokia cellphones or even configure your preferred SIP service to take advantage of low rates calls. You can also send and receive SMS at low prices. Phone calls among other PowerVoip users are free worldwide. No voicemail is available, nor you can receive calls.

PowerVoip call rates

http://www.powervoip.com/