WhatsApp: so you can send messages to a number without having to add it

One of the peculiarities of WhatsApp is that to send messages to someone you have to have their phone number in your contact list. However, for privacy or other reasons, it’s best not to add a person you don’t know very well. In this sense, you should know that there is a secret trick that works in iOS and Android, and that allows us to send messages to someone without having to add it to our agenda. How can you do it? Here we explain it to you.