I have been following this post, and Don't think it was mentioned yet.
But if you spin the unlock dial on the screen w you finger on the sound circle to the left it spins around ans then turns to "Sound Off"
Pretty Cool & Quick way to silence the phone w/o even unlocking it
And BTW ....whats up w that stupid Tutorial?? I thought mine was incomplete or something...it only has like 1 page dealing w the keyboard??