Apple has released iOS 11.2 beta 4 for all iOS 11 compatible devices and it is now available for download. If you are already running iOS 11.2 beta, then head over to Settings > General > Software Update to download it on your device. If you are new to iOS 11.2 beta, then you can download it from the developer center.
iOS 11.2 brings Apple Pay Cash, which is already available to those beta testing the latest software. The final version of iOS 11.2 is also expected to brings AirPlay 2 feature.
Previous iOS 11.2 betas have added iPhone X wallpapers on older iPhones, solved calculator bug, introduced tweaked emoji and more.
In addition to iOS 11.2 beta 4, Apple has also released fourth betas for watchOS 4.2 and tvOS 11.2, which are also available for download.