Apple has released iOS 12.4, improving iPhone migration as well as re-enabling the Walkie-Talkie app on Apple Watch with watchOS 5.3. The update is available for iPhone, iPad, and Apple Watch users today, and ends a week of offline functionality for Walkie-Talkie, after it was found to suffer a potential eavesdropping bug.
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https://www.slashgear.com/ios-12-4-released-walkie-talkie-back-online-plus-theres-a-surprise-22584777/