How to Send Messages on WhatsApp Without Internet?

Explanations

To get started, you have to go through the following steps: Menu > Settings > More > Mobile Network > Access Point/ APN, and then you need to check whether the APN of the mobile operator is correctly entered.

Download and install Yoga APN. After downloading the app, you need to turn off Wi-Fi and turn on mobile data. Check if there is any balance on your phone.

The next step is on the Yoga VPN screen. You must click Quick Start, select the WhatsApp application on the next screen and wait for the VPN to establish a connection.

After you have established a connection, a key appears on the notification bar to indicate that you are connected. Of course, the best way to verify the connection is to send messages through WhatsApp. 

When the connection is ready, the application will show you a message indicating that you have successfully connected. You can then use WhatsApp as usual.

In theory, when you see this, you will be able to send messages for free without the Internet. But the best way to check, of course, is to test: send your first test message to a friend.