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Apple released the first iOS 12 public beta for iPhone and iPad devices. Thus, non-developer users can already register and experience the features for free, before Apple officially releases iOS 12.
Before Apple released the public beta,
In terms of stability, since this is not yet the final official version, errors are inevitable. Specifically, bugs in the iOS 12 public beta include incorrect location data in Maps and some other apps, CarPlay crashes, FaceTime errors when multitasking.
You can
If you still want to pre-test the iOS 12 public beta, you can visit beta.apple.com to sign up for free.
https://Software/apple-phat-hanh-ios-12-public-beta-dau-tien-23270n.aspx
In the process of using iOS 12, users will encounter many different errors, please take a look at the article summarizing