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Few days ago... I started to hear voice prompt like "Received one email"... I have no clue what happen why it gives me these voice prompts. So annoying. Then I google around to find out it was the "Drive mode" that I tapped on... :/
pull down notification bar and you shall find the Driving mode.
Mine is Tmo version. These are the icons on top of the notification pull down
WIFI
Bluetooth
GPS
Sound
Screen Rotation
Power Saving
Airplane mode
Driving mode
Sync
what does the Sync item do? Does it need to be on?

What about dock mode? Does anyone know how to disable that?
Settings / Dock / uncheck Desk home screen display
On mine, unchecked, keeps the dock screen with the clock and blue background from loading. It stays on the home screen then goes to sleep after your set time. Black screen.
The dock screen looks a lot like the lock screen, but it is different. It has different apps across the bottom of the screen. Also, when on the dock screen, you can hit Menu to edit what is on the dock screen.