how to run react js app on phone code example

Example: run react native app on android device

#enable debug mode on yur device

$ adb devices
List of devices attached
emulator-5554 offline   # Google emulator
14ed2fcc device         # Physical device

$ npx react-native run-android
Try:
$ react-native run-android --deviceId=14ed2fcc

#use adb reverse
$ adb -s <device name> reverse tcp:8081 tcp:8081

NOTE:
You can also use the React Native CLI to generate and run a Release build
(e.g. npx react-native run-android --variant=release).