The WhatsApp messaging application is the most used by Spaniards to communicate. However, one of the options offered by the app is to block our contacts without the person in question knowing. Despite this, there are ways to discover it. The fastest way is to ask, obviously. But if you do not dare or prefer to do it behind the back of that person, the infallible proof is to try from another telephone number. When a person blocks a contact, it stops seeing if it is connected, the last connection and does not receive the two ticks that indicate that the messages have been sent and received. From another number you can check if it happens with all the contacts or only with yours: if this second person can send you messages, you can see a different profile photo or a last last connection date, it means that you have been blocked. Another way to identify if you have been blocked without relying on another number is to try adding them to a group. If you can do it if there is no problem to worry about, but if WhatsApp says that an error has occurred, it is most likely that they have blocked you. You should suspect if the last connection is days ago or by clicking on your profile, where the photo can also be proof that you have been blocked: if it has not been updated for a long time and before it was done every two times, it is a bad omen. All these options to know if they have blocked you depend on if the users have their WhatsApp configured to show the last connection time, the profile image and the two blue ticks, so they are not 100% reliable methods.