Navigate to Data Usage: Within the Settings menu

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ocate and click on "Data and storage usage."
Disable Background Data: To prevent WhatsApp from using data in the background, uncheck the "Background data" option.
Disable Auto-Download: You can further conserve data by disabling auto-download for media files. Simply uncheck the options under "When using mobile data" and "When whatsapp number database connected on Wi-Fi.


Turn Off Mobile Data for WhatsApp: If you want to completely turn off data usage for WhatsApp while keeping other apps connected, you can restrict mobile data access specifically for the WhatsApp application in your device settings.
Use WhatsApp Web: Another option to stay connected without using mobile data on your phone is to use WhatsApp Web on your computer. This way, you can continue to send and receive messages through a web browser while your phone remains offline.