Alongside iOS 12.4, Apple also released the watchOS 5.3 update for all compatible Apple Watch. The update fixes the eavesdropping bug with the Walkie-Talkie app and re-enables it once again.

Apple had disabled the Walkie-Talkie app on the Apple Watch last week after it discovered a major eavesdropping bug.

The company had mentioned in its statement that it was not aware of the exploit being used against any of its customers and that it required a very specific set of conditions and sequences of events to work. However, as a precaution, Apple disabled the Walkie-Talkie app on the wearable.

Additionally, the watchOS 5.3 update expands the ECG app availability to Canada and Singapore. In March, Apple had expanded ECG support on the Apple Watch to Europe with the watchOS 5.2 update. When the ECG app was rolled out to the Apple Watch Series 4 initially last year, the feature was only available for users in the United States. However, slowly but steadily, Apple has worked on expanding its availability to other parts of the world as well.

To update to watchOS 5.3, owners must make sure that their smartwatch has at least 50 percent battery life, and that the device is attached to a charger. It must also be connected to the iPhone and within range.

Follow our guide to know how you can use the ECG app on your Apple Watch.