You can distinguish between glass and plastic phone screens by considering the following aspects:
First, hardness. Glass is harder, making it less prone to scratches from sharp objects, while plastic screens are more easily scratched.
Second, transparency. Glass screens generally have higher transparency, displaying clearer and more realistic images, while plastic screens are relatively less transparent.
Third, feel. Glass screens feel smoother and cooler to the touch, with a harder texture; plastic screens feel softer and less hard.
Furthermore, you can distinguish them by observing the screen's gloss. Glass screens have a better gloss, with a certain mirror effect; plastic screens have a relatively lower gloss.
Then, weight. Generally, phones with glass screens are relatively heavier because glass has a higher density than plastic.
Finally, sound. Gently tapping the screen with your finger produces a crisper sound from a glass screen, while a plastic screen produces a duller sound.