Just after
the release of iOS 11 developer beta 5 yesterday, Apple now made
available of iOS 11 beta 4 for public testers for iPhone and iPad.
Features in
iOS 11 Public beta 4 is same as the features that were present in the previous
released of iOS 11 beta 5. But it has also fixed some bugs and bring
improvements and minor changes in iOS 11 Public beta 4. Apple has made some
changes in iOS 11 beta 4 like Messages, Camera, Control Center, Home
screen, Notification Center & Lock screen, Files app and minor changes in
settings. 
Just after the release of iOS 11 developer beta 5 yesterday, Apple now made available of iOS 11 beta 4 for public testers.
iOS 11 Public Beta 4 is available for download on iPhone – iPad and iPod touch via OTA over-the-air from iOS settings app through Apple Beta Software Program or if you are running previous iOS 11 Public beta 3. 

To get iOS 11 Public beta 4 you need to download the configuration profile and install it from the OTA Software.
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