Observant users may have noticed that in the version of Android 4.2 Jelly Bean by default, the list is not displayed Developer menu. Typically, this item can be found in the phone's settings, but now it's gone. How can I return it? Very simple.
So, go to the settings of the smartphone, select the lowest point "About phone." Here at the end of the list there is an item "Build number."
All you need to do - tapnut this point seven times. Yes, that's it :) After the fourth tapa you'll see a system notification about the number of remaining tapov to open the developer mode. After the seventh tapa joyful message alert that you're now a developer. We go back up a level and is now among the settings there is an item "For Developers".
If you do not know the purpose of all these options, it is best not to change anything, and immediately move the slider in the upper right corner in the "Off" position.
Recall that the Developer tools allow you to, among other things include the debugging via USB. This function is required for root and other useful things. Do not forget that without the need for developer tools and USB debugging notably better off.
A Google jokers.