To unlock the Dev Options menu, go to Settings -> About Device and scroll down to the “Build Number.”
Now, tap on your “Build Number” seven times, and you should see a toast notification pop up saying “Developer mode has been enabled.”
Back out of the About Device menu and you’ll see Dev Options back where it belongs, so you can turn on USB Debugging and whatever else you want to.
If you updated to Android 4.2 on your old Samsung Galaxy S3 or other Android device, this is probably nothing new. If this is your first go on the new Jelly Bean version, well…now you know.
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