Zenless Zone Zero has seemingly opened pre-registrations for mobile devices on the Apple App Store and Google Play Store.
The game is currently rated 12+ on the App Store and Teen on Google Play and published by HoYoverse global publishing subsidiary Cognosphere.
(They have officially announced pre-registrations for Zenless Zone Zero, you can read about it here.)
In addition, the App Store version of the game has a posted 3 July 2024 as an expected release date for the 3D action game.
This comes as a surprise as developer HoYoverse has not made any official statement or announcement of the Zenless Zone Zero pre-registrations for mobile devices. Additionally, no official release date has been slated for the game as it is still undergoing beta tests for Android and iOS devices and PCs since 18 April 2024.
The game has also recently closed recruitments for the technical test on the PlayStation 5 on 17 April 2024, with the actual technical test to begin sometime in the future.
HoYoverse has also not made any statements confirming or denying the expected release date visible on the App Store. As such, please take the information available about the possible release date with a grain of salt until HoYoverse confirms an official release date as this information may change in the future.