1. Open your phone app by pressing the Green phone icon
2. Hit the blackberry button and select "View Speed Dial list" form the context menu.

You will see that A is assigned to Lock Keyboard. Even though there are no menu option to change it or remove it, if you hit enter you should be brought to the contacts where you can select someone from your contacts. This should do the trick for you.

Why they hid the feature that you have to press enter to chose a user. Now the question I have is how do I set mine back to lock keyboard.