Samsung Electronics GmbH
Hello,
classic internet telephony or video chats are possible with an internet connection with the Galaxy Tab A7 Wifi (2020).
Best regards from Schwalbach,
Your Samsung Service Team

You can use WhatsApp, but only if it is the LTE or 5G version.
Not the Wi-Fi version.
WhatsApp needs a phone number of the user. This means: You need a phone contract with which you can use WhatsApp. And for that you need the tablet version with LTE or 5G. The tablet version with Wi-Fi cannot do that.

Yes, you can also use wats-up on the tablet