Just pull the notification shade all the way down and I believe just simply tap the build # (circled in red 
in screenshot below) and the text is copied to the clipboard. It doesn't highlight it or do any other effect like normal text you would select. Maybe this is something everyone else knew about and I'm the last one again. 
I get:
in screenshot below) and the text is copied to the clipboard. It doesn't highlight it or do any other effect like normal text you would select. Maybe this is something everyone else knew about and I'm the last one again. I get:
Code:
12 (SD1A.210817.036)
