Only the S21 Ultra allows for S-Pen connectivity. You can still use it on the regular s21, but it's only going to give you the capacitive touch to write on the screen. You will not be able to use any of the clicks or air gestures on the S Pen.
@saulsetton Sorry but the S Pen will not work in any way with the S21 "regular". You will not be able to scroll the screen nor click on anything.
If you want to use a stylus with the S21 you will need to get one with a rubber spongy tip. These approximate your finger touch and therefore the screen will recognize it.
