Translations:Plugin:ICQ/63/en

Here is how it works. Imagine that you are using Android and you have decided to call your friend in WhatsApp. He selects your contact in the list, clicks the call icon and then sees the animation of the connection. At this time, his application sends a call to the WhatsApp server. Which, after processing the call, it makes a request to the Google server. In this request, if we translate it into a language understandable to us, there will be something like "display on the device with an application ID having such and such notification of an incoming call from such a contact".