The Samsung Galaxy 4 can be diagnosed in a number of ways, but now it can be diagnosed by putting some codes into it. The code is really simple but it can be used to diagnose the full Samsung Galaxy Watch 4.
You can get to the diagnostic screen by dialing a special code in the watch dialler. The code is *#0#* which will open the diagnostic menu where you can check all the functions and sensors in the watch by testing them whether they are working correctly or not. This can come really handy as the feature will enable users to check whether all the functions are working correctly or not on the watch and hence also can detect specific hardware and sensor issues directly on the watch itself.