Locking the keys by holding down the red phone key requires you to press the power button, Unlock softkey and "*" key to unlock. You can go to Settings/Security/Device Lock to set a PIN to unlock the keys. Once you do that you can press the left softkey to bring up the PIN dialog without pressing the power button. You can also set a timer to turn on the lock after a selected period of inactivity.

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Earl F. Parrish