NOLOCK
i use an app called "NOLOCK". basically lets you unlock the screen by pushing the volume or any button on the keypad. and if you add it as a widget on your screen, you can quickly go back and forth between this unlocking method. so if you are out for the night and think the phone might unlock on its own too much cause of the keypad, you can turn off the feature easily. but while sitting in an office all day, you can turn the NOLOCK feature on if your phone is sitting at your desk all day.