WhatsApp is the favorite instant messaging application for millions of users, which facilitates communication with loved ones; However, popularity has a serious problem, since it needs our phone number to create the user in our contact list. Something that can cause it to end up on the agenda of other people, strangers or malicious users.
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With this simple trick you will be able to know if some stranger has added your number.
It may seem impossible to know who has our number on their phone, but the WhatsApp service has a secret in Android as in IOS which allows us to know if a stranger or stranger has us on your contact list.
The first thing to do is create a broadcast channel with all your WhatsApp contacts and groups in which you are participating, a measure that allows you to send the same message to several contacts at the same time without the need to create a group.
A short time later, when accessing the information in the message you will be able to see who read the text, as well as the time and which contacts have not yet seen it. If a number appears in this section that you do not have registered, or that you cannot relate to someone you know, it means that they have your number in their phonebook.
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