Calling your friends and family internationally makes all the difference when you don't have to worry about long-distance charges. Regardless of where your loved ones live in the world, you don't have to worry about a high phone bill with overage costs for going over your minutes or incurring international charges for long-distance calling. With the proper software and mobile phone, you can take advantage of free calling using your mobile phone's Internet connection, also called Voice over Internet Protocol, or VoIP. You can use Wi-Fi or a 3G network.