Three things with my Captivate are driving me nuts: 1) How do I change the "Signature" so it doesn't always add "Sent from my Samsung Captivate" at the end of my emails. 2) How do I stop the phone from scanning the SD Card everytime I turn it on? 3) A lot of times when I am on a call, if I move the phone around, my face hits the mute button, etc. How do I get the screen not to do anything while I am on a call? Thanks!