I know that I didn't choose to encrypt mine. Not sure how to disabled that if it is.
I am using my phone for office email through an outlook exchange server as well as gmail and basic apps. Could the set up of one of these have caused me to encrypt my phone? Other co-workers using the same phone and the same email setup do not have their phones encrypted. If it happened accidentally I would like to change it back to the un-encrypted setting assuming it doesn't cause too much headache for me to change. I have no idea how to change it back BTW.
Had the same issue with the pattern lock. When I clicked on the pattern lock to try to turn it off, all I got was the pattern screen. I entered the pattern and it opened up was able to take the lock off.