WhatsApp and Facebook Messenger
There’s no doubt that Facebook and WhatsApp are two of the most popular platforms that can also make international calls. Facebook has about 1.3 billion members by the last count, and WhatsApp has about 1.5 billion. Because of that, there’s a good chance that your call recipient has an account.
Both WhatsApp and Facebook Messenger let you send messages to each other over an internet connection, as well as make voice or video calls.
Both apps are also widely available across different platforms, including both iOS and Android. Before moving on to any other app, it’s a good idea to check these two first.