This page will interest you if you spend a lot of money on calling people abroad, be it close relatives, friends or business contacts. The best way to make completely free international calls is through a computer connected to the Internet. As explained before, you can use software-based VoIP services to make free calls worldwide.
This way of contacting people worldwide for free can also be used on mobile phones and other portable devices. You need to install the service's application on your mobile device and make sure your contacts do the same as well. Then, with an Internet connection, you can make and receive the calls for free, through the same service as your buddy.
There are many cases where you need to call someone abroad on their mobile or landline phones, and this kind of service is not free...yet. But it is cheap, as we have seen on the previous page. Some service providers have designed plans with really cheap call rates. These services moreover do not need a computer, they can be used on the move. The two best examples so far are 1ButtonToWifi and Vonage Pro.
I need to mention the device-based services here, which, when used in a certain mode, can allow you to save on international calls. For example, with MagicJack or PhoneGnome, a person in one country having the device can call a person in another country having the device as well for free, since in-service calls are free.
Another way of saving on international calls is by using virtual numbers. A virtual number is an anonymous number that you attach to a real number, such that when someone calls you on the virtual number, your real phone rings. Here is a list of virtual number service providers.

