Your opinion about my patent "Automatic keypad locking system based on device's inclination"

Hallo cellular phone users

did you also forget to switch the keylock system on or do you also hate
always to switch it off before doing a phone ?
I do and also had many times the phone dialing without my intention :-)

Some weeks ago I had an innovative idea I just patented:
Lock/Unlock automatically the cellular phone keypad whenever it's not
in a defined inclination (the one when in the hand, e.g. between 30°
and 70°)

How useful do you think is such a feature ?
How much would you appreciate such a feature in your new mobile phones
?

Here some additional infos:
-It's automatic: No user action to lock or unlock required anymore - No
"key lock" systems anymore to unlock each time before calling someone.
-It's immediate: The cellular phone is always ready for use as soon as
it's in the hands of the user - No need to press always the annoying
unlocking key sequence - No need to wait the device gets automatically
locked after X seconds before putting it in the pocket
-It's secure: Unintentionally key presses when the device is in the
pocket or bag will have no effect. Device is usable only when in the
hands of the user !