If you have got a Nexus 4 phone or a Nexus 10 tablet, or just update your Android device to Android 4.2 Jelly Bean, you probably notice the developer options menu that includes USB debugging and others is missing in the setting. Yes, you can't find it by default. Because the Developer item has been disabled by Google.
How to unlock/restore Developer Options listing on Nexus 4/7/10 Jelly Bean 4.2
* Tap "Setting" app and scroll down to select "About Phone".
* Scroll to the bottom of screen and tap on "Build Number" with 7 times. Then a message will talk you that you have unlocked and restored the Developer Options menu successfully. Now you would be able to access it within Setting menu.