WhatsApp calls are not yet available to all users and will not be. Some countries will not have VoIP calls according to the app itself.
Apparently it could be blocking operators that do not allow the use of VoIP by their customers. In Spain this only happens with some lower rates but in general all users will be able to enjoy calls.
More than 1 year waiting for the happy calls and getting them is quite complicated, since the invitation faucet opens and closes as they want. It is expected that all users will eventually be able to access uninvited calls.
Of course, except for those from certain countries that will see a message like this: “Unfortunately, WhatsApp calls are not available in your country.”
At the moment we do not know which countries will not allow the use of free WhatsApp calls. At the European level we do not expect any since the European Commission has opposed this type of blocking of services.
Let's remember that WhatsApp allows calls between users of the app with a fairly affordable data consumption and, of course, without charging per minute or call. In other words, the calls are completely free, they will only consume data just like WhatsApp text messages, YouTube videos or the Facebook social network can.
WhatsApp has blocked invitations once again and for a few days surely more users will not be able to activate them, since the process is being quite limited and slow.