If security is a primary concern, IMO voice and video calls are encrypted. Even though you might have 4G LTE everywhere you go, other countries are thankful just to have the internet. IMO supports international calls where only a 2G connection is available. Many VOIP apps require a 3G cellular connection or using a wifi network.

However, if the person you’re calling doesn’t live in one of these supported countries, you will both need to connect to wifi or a minimum 3G data connection. Rebtel uses local numbers to complete the call to other Rebtel users. What makes Rebtel cool is that you can make free international calls to over 53 countries without a data or wifi connection. Or, you can also open the Viber app and choose the person you want to call or chat with for free too. You only have to choose the person from your Viber contact list and click “Free Call.” Viber is one of the most popular apps for free international calls. You will need a wifi connection to make the call, but audio and video calls are free.įaceTime only works between two Apple devices and is incompatible with all non-Apple devices. If you’re connecting to another Apple user, you can use the built-in FaceTime app. In fact, there even is a WhatsApp for Business platform that helps businesses easily connect with their customers. WhatsApp also lets you send documents up to 100 MB in size which can make this a perfect app for business too. You can make voice or video calls plus send SMS messages to anybody else with the app. WhatsAppĪnother commonly used app is the Facebook-owned WhatsApp. So in a nutshell, Skype to Skype international calls are free, but Skype to traditional phones cost money. If you need to send text messages or call a cell phone or landline, you will have to pay a monthly fee. Skype is a free app for Android, Apple, and Windows devices.

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