https://wccftech.com/download-ios-12-public-beta-2/

Apple has released iOS 12 Public Beta 2 for both iPhone and iPad users. It’s available for download right away.

Those enrolled in the Beta Software Program will be pleased to learn that they can download iOS 12 Public Beta 2 on their iPhone and iPad for free. The update, as you’d expect, is available to download over the air. If you have the first public beta build already installed on your phone or tablet then you can grab the latest build over the air straight away. Also keep in mind that this version of the public beta carries the same changes as iOS 12 Beta 3 which was seeded to developers a while back. So, don’t expect anything out of the ordinary in this release rather than the usual fixes.