You need to google GETSPC. Download that program and extract the .zip to your phone. Write down your HexESN that is behind your battery.
Now open the GETSPC on your phone and type in the HEX number. It is case sensitive so if you number is 35F87654 make sure that you capitalize the "F".
It will then give you the unlock code.
Once you are in, click on the bottom lefthand corner "View Info" then click on Data parameters. You'll find Rev A. there.
MINE WAS DISABLED AND I WAS GETTING CRAPPY SPEEDS. I've enabled it and i'm getting
My download speeds doubled!! BUT, my upload speeds went way down.