A day after the release of the beta version of iOS 12.1.2 for developers, Apple released a public beta for iPhone and iPad. The new version of the OS has to resolve a series of bugs with iOS 12 and 12.1.1.
Public beta testing allows you to be the first to try new iOS build. One of the advantages of this format — no annual fees, whereas for obtaining the status the developer must pay a fee — $ 99 per year.
In addition to iOS, the test program is for macOS and tvOS. In the near future are expected to be public beta tvOS 12.1.2 and macOS 10.14.3.