Hackers have been installing spyware on WhatsApp users' phones using WhatsApp calls. Even if you do not answer the call, the malware can be installed, giving the criminals access to your data.
Hackers can access your data, such as
● Media files
● Contact lists
● Access camera/mic
● Read encrypted chats
Make sure you are running the latest version of WhatsApp
Under 'App info,' if it says you have version 2.19.134, good news! Your phone is protected. Anything else, you need to install the latest version.
This should keep you safe.