You don't necessarily need to have a mobile number to send messages on WhatsApp. You just need to know one of these three tricks and you're done
You just bought a new tablet but realized too late that since it doesn't have a SIM slot, you can't take advantage of it to send messages on WhatsApp. As you know, in order to use WhatsApp, you need to have an active mobile number, which you will use as your login username. This, at least, is what they say in the guides on how WhatsApp works.
What almost no one says, however, is that you can use WhatsApp without a SIM card and exchange messages with your friends and contacts without major problems. Of course, you'll have to employ a little imagination and figure out a way to do it yourself. Or, much more simply, read the guide below to find out how to use WhatsApp without a SIM card.
Be careful, however, not to use a number linked to another account. Although you can have WhatsApp on two phones, you will not be able to use the account on both devices at the same time. Also, if you frequently alternate your WhatsApp on various smartphones, you risk losing chats forever. Frequent changes could make the messaging platform's algorithms suspicious and, in the long run, the account would be blocked once and for all. So, if you really want to use WhatsApp without a SIM card, follow the instructions below and you won't run any risks whatsoever.
Use another phone's SIM card
The easiest way to use WhatsApp without a SIM card is to take advantage of a mobile number that has not yet been subscribed to the platform. It can be an old number that you have not used for some time, or a SIM inserted in a "non-smart" phone, or even the number of your uncle or grandmother. In short, the important thing is that it has not already been used to register an account on the messaging platform. All you have to do, in fact, is enter the number when you sign up and type in the security code that you will receive via SMS.
WhatsApp Web
In case you do not have a mobile number to use, you can always choose to use WhatsApp Web on your tablet, smartphone or PC and continue to exchange messages, photos and voice messages with your friends even without a SIM card. In this case, however, you will have to put on a good face and accept the fact that you cannot create a second WhatsApp account, but you will continue to use your "old" profile.
Use a temporary number
The last option is to use a temporary mobile number (you can find them galore on the web) to receive the activation message and thus have a second WhatsApp account to use as you wish. The drawbacks, in this case, are many. First of all, the temporary number will never be in your complete control and someone else could use it to activate a second WhatsApp account, leaving you without a number. Also, you should remember the number and send it to the people you would like to chat with: in order to exchange messages on WhatsApp, in fact, it is necessary that the other person has your number in their address book, otherwise they might think it is a hacker or spam messages.