Adding a contact to WhatsApp is a simple gesture. iPhone owners just need to tap on the pencil icon and select the ‘New Contact’ option. If we have already started chatting with that person, we will have to go to the ‘Chats’ tab, click to see the information and create a new contact. The steps for Android similar. Just change the icon.
However, sometimes adding a contact to WhatsApp is a matter of will. Some are not interested in adding one more contact to their agenda and others do not want to know anything about that person.
In any case, if we want to know if the person we are talking to has us in their contact list and has added WhatsApp to us, we just have to use a simple trick. And we suspect that this is the case because we do not see the profile picture, the status or the last time of connection.
The only opportunity we have to obtain this information is thanks to the broadcast lists, which allow us to send a message to several contacts at the same time. Specifically, up to 256 contacts.
When we create a broadcast list, WhatsApp already warns that only “contacts who have your number saved in their contact book will receive your broadcast messages”. Whoever does not have us will not receive it. And therein lies that loophole that we can take advantage of.
Next, we will have to prepare a message, which will be the one we send to these contacts. When we have it ready, we send it and give a margin for them to receive it. Then, we will select the text and request the ‘Info’ option. The user who is part of the distribution list, but has not received the message, will not have us saved, although another option is to have the mobile turned off or without coverage.