Apple has released the beta 4 of iOS 12.1.3, both to developers and beta testers enrolled in Apple’s public program.
Both beta testers and developers who have already downloaded the previous beta will receive the update via OTA. iOS 12.1.3 beta 4 is limited to fixing some bugs and improving the general performance of the iPhone.
Apple released only a beta of iOS 12.1.2, to make a series of changes to the software for devices sold in China, to try to send the problem that the company faces with Qualcomm in China, moving the content that should include iOS 12.1.2 to iOS 12.1.3.
This new beta will be the fourth official update of iOS 12, an update that we still do not know what changes it brings. To update, head over to Settings > General > Software Update from your device