Device Lock is a small program developed by Matt Armstrong that allows us to assign the 'Device Lock' to a hardware key. The benefits are obvious - no need to have an icon on the today screen, and this program also eliminates the need to tap the screen to unlock the phone. Instructions on how to use the PTT button to lock the phone are below.

• Download the Device Lock program (via XDA_Developers - registration required). Install it according to the instructions (copy the file to your phone and click on it to install - to the phone - not the storage card).

• Follow the instructions on remapping the PTT button (found here).

• From the Start Menu, go to Setting -> Buttons. There should be a Button 6 which corresponds to a single press of the PTT Button; and Button 6 Hold which corresponds to a 'press and hold' of the same PTT button. Set one of those to Device Lock (I set Button 6 Hold).

• To set the options for the Device Lock program, from the Start Menu, go to System -> Device Lock. Checking Easy Unlock eliminates having to tap the Today Screen to unlock.
  

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