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WhatsApp was hacked in early May.
- WhatsApp is urging users to update the app after it was targeted by hackers.
- Scroll on to find out how to make sure your phone is safe.
- $4
WhatsApp is urging people to update the app immediately after it was targeted by hackers installing sophisticated spyware on users' phones, giving them access to a trove of data.
The security vulnerability has been fixed in updated versions of WhatsApp released in recent days, but some users will need to manually update the app to get protected.
It is not yet known how many of WhatsApp's 1.5 billion users were targeted by the bad actors, who installed the surveillance technology - developed by Israel's NSO Group - by phoning the target through WhatsApp's call functionality.
Read more: $4
Facebook, which owns WhatsApp, said: "WhatsApp encourages people to upgrade to the latest version of our app, as well as keep their mobile operating system up to date, to protect against potential targeted exploits designed to compromise information stored on mobile devices."
Scroll on to find out how to make sure your phone is safe.