"Transparent Phone Screen HD Simulation" is a free lifestyle app developed by Just4Fun for Android 9.0. This app enables you to view your surroundings through your phone camera while running other apps or browsing your phone. It displays a transparent view of what your camera is capturing on your phone screen, allowing you to see everything in front of you. This can be useful while walking in the city or avoiding obstacles on the pavement.

The app also features adjustable camera view transparency levels, rotation angles, and settings while the camera is on. You can even prank your friends by showing them your "transparent phone" from at least one meter away. The app works smoothly and fast on both old and new Android devices, and it supports HD screens. Additionally, the app comes with a widget for direct access and a live wallpaper.

The app is also available on WearOS devices, but it needs to be used in conjunction with the phone app. With the watch app, you can start the transparent phone simulation on your phone.