Check this out:
N-Gage Thoughts. . . while perusing the documentation for the N-Gage I learned how to lock the keypad quickly on my 3650!! Press the left screen key and the * button at the same time and *poof* it’s locked. Press them again and it’s unlocked. I had NO idea this worked and always used the menu on the off switch … LOL. That right there may have been worth the price of the device alone.[Russell Beattie Notebook]
That is a really useful thing to know! Thanks!