The malware was able to penetrate phones just through missed calls, using the app’s voice calling function, said the WhatsApp spokesman, who was not authorized to be quoted by name. He said an unknown number of people — an amount in the dozens at least would not be inaccurate — had phones that were infected with the malware, which the company discovered in early May, the spokesman said.

Source: Los Angeles Times May 14, 2019 21:56 UTC