I am always slightly nervous about self-diagnostic features in phones, primarily due to my history of working in second-hand electronics and as an engineer for Samsung. During that time I found that many people can get a bit confused about what all these numbers and different screens mean. After all, having the tools to diagnose an issue doesn't mean that you can actually diagnose it yourself.
In the past we used to use the *#0*# code to get to the test menu, a feature many users still don't know is there. However, Android is unveiling a new diagnostic feature for Android 15, which makes it easier than ever to diagnose your Android device, at least in theory.
