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Lock the keyboard

If you are not on a call, you can lock the keyboard to avoid pressing keys accidentally when you are not using your BlackBerry® device. If your email account uses a BlackBerry® Enterprise Server, depending on the options that your administrator sets, you might not be able to perform this task. For more information, contact your administrator.
Press and hold the Mute key on the top of your device.
After you finish: To unlock the keyboard, press the Mute key again.

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