This is because these apps connect your calls with the help of Internet Protocol. Today, we use most of these apps which we are going to mention in our article, so now let us provide you detailed information about these apps.
First of all, we talk about Facebook’s instant messaging app WhatsApp. WhatsApp is a very popular app, as we all know that with the help of the app, not only chat but also sharing of media files, voice and video calls etc. can be done. If your phone doesn’t have a mobile network for some reason but you’re connected to Wi-Fi, you can make voice calls.
First open the WhatsApp app. Then click on the name of the person you want to call. After clicking on the name, the chat window will open, here you will see the icon of voice and video call on the top right side. By clicking on the voice call button your call will be connected with the help of internet protocol.
Facebook Messenger
Facebook’s Messenger app is not only used for chatting but also for many other purposes like making voice calls and posting status on Facebook. Just like in WhatsApp, in Facebook Messenger, click on the name of the person you want to call.
After doing this the chat window will open and here you will see two buttons on the top right side just like the WhatsApp app. One for voice and the other for video calling. Your call will be connected with the help of internet protocol as soon as you click on the voice call button.
truecaller
Apart from WhatsApp and Facebook Messenger, you can also use the Truecaller app to make voice calls. Many things can also be done with the help of Truecaller app. To make a voice call, first open the Truecaller app and then search for the name of the person you want to call.

Go to the profile of the person you want to call, here you will see the button for voice call. On clicking the voice call button the app will connect your call with the help of internet protocol.
For the information of the people, let us tell you that with the help of these apps mentioned above, it is possible to call only that person who is using the app.