iOS 12 public beta 4 was released for iPhone and iPad last night by the Apple company, the new version of the operating system can now be installed by anyone. All the new features that Apple offers in the beta versions of iOS 12 are now available to users worldwide, so anyone can use them.
iOS 12 public beta 4 can be installed by anyone, but I recommend you avoid it, because there are still many performance problems that will spoil your user experience. From problems with running applications to major problems with GPS, iOS 12 is one of the most problematic beta versions that Apple has released so far.
I do NOT recommend you to test iOS 12 public beta 4 for now because you will have more headaches than good things, and if you use a backup of iOS 11, then it is possible that you will not be able to go back to it. Having said that, I recommend that you avoid iOS 12 public beta 4 and wait for the release of other newer versions of the operating system.
