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With so much squeezed into such a small unit, the BlackBerry Pearl has some surprises tucked away. The mute button, for example, on the top of the unit, doubles as the one you press to enter Stand-by mode.

Press and hold the Mute button and a message pops up indicating the unit is in Stand-by. In this mode, calls will still come through, and the unit lights up so you can answer.

When you disconnect from the call, the unit stays on. If you don't answer the phone, however, the until will revert to Stand-by after two rings or when the incoming call is terminated by the caller.

To come out of Stand-by when there's no call coming in, you again press the mute button. In this way, Stand-by also serves as a simple way to lock your buttons so you don't accidentally dial someone when the phone presses against your pocket.