In settings on my Nexus 4 device there isn't any "USB debugging options" item. How do I find and turn on USB debugging mode on Nexus 4?
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16go to your settings , about device/phone. then tap 7 to 8 times on the build number list item. You will be declared as a developer – Rohit Sharma May 23 '13 at 06:39
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How do you use it though – barlop Apr 23 '14 at 08:26
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I would note that a troubleshooting step (I vaguely recall being recommended by google over the phone) was to turn off debugging mode! – – barlop May 04 '14 at 10:04
6 Answers
Solution
To see the option for USB debugging mode in Nexus 4 or Android 4.2 or higher OS, do the following:
- Open up your device’s “Settings”. This can be done by pressing the Menu button while on your home screen and tapping “System settings”
- Now scroll to the bottom and tap “About phone” or “About tablet”.
- At the “About” screen, scroll to the bottom and tap on “Build number”
seven times.
- Make sure you tap seven times. If you see a “Not need, you are already a developer!” message pop up, then you know you have done it correctly.
Done! By tapping on “Build number” seven times, you have unlocked USB debugging mode on Android 4.2 and higher. You can now enable/disable it whenever you desire by going to “Settings” -> “Developer Options” -> “Debugging” ->” USB debugging”.
CONCLUSION
That was easy. The best part is you only have to do the tap-build-number-seven-times once. After you do it once, USB debugging has been unlocked and you can enable or disable at your leisure. Please restart after done these steps.
Additional information
Setting up a Device for Development native documentation of Google Android developer site
Update: Google Pixel 3
If you need to facilitate a connection between your device and a computer with the Android SDK (software development kit), view this info.
- From a Home screen, swipe up to display all apps.
- Navigate: Settings > System > Advanced.
- Developer options .
If Developer options isn't available, navigate: Settings > About phone then tap Build number 7 times. Tap the Back icon to Settings then select System > Advanced > Developer options. - Ensure that the Developer options switch (upper-right) is turned on .
- Tap USB debugging to turn on or off .
- If prompted with 'Allow USB debugging?', tap OK to confirm.
Doc by Verizon: Original source

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3Restarting is not necessary, at least not in versions >= 4.2. – Andreas Kuckartz Jan 04 '14 at 19:23
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2On some devices, it might be Settings -> About -> Software Information -> More -> Build Number – jasonmray Mar 19 '14 at 06:50
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Note. I have Android 4.3 and I need restarting. Thanks for the answer. – Dmitry Kolesnikovich Jun 19 '14 at 15:22
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2no one explains what should happen after the "USB Debugging" is enabled?! I enabled it and connected the device via USB to my machine.... now what? How I do debug? – sam360 Jul 11 '14 at 13:42
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At first I tried up up down down left right left right b a select start. Didn't work. Thanks for your solution. – ahnbizcad Jan 13 '15 at 07:49
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In some older devices, it can be achieved by : Settings > Applications > Development > check "USB debugging". – Omar Jun 22 '15 at 13:23
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Looking for About Phone in Settings. And scroll down till you see Build number. Tap here till you see Toast message tell you have just enable developer mode.
Back to settings, you can see options: "Developer options"

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Step 1 : Go to Settings >> About Phone >> scroll to the bottom >> tap Build number seven times; this message will appear “You are now 3 steps away from being a developer.”
Step 2 : Now go to Settings >> Developer Options >> Check USB Debugging
this is great article will help you to enable this mode on your phone
Navigate to Settings > About Phone > scroll to the bottom > tap Build number seven (7) times. You'll get a short pop-up in the lower area of your display saying that you're now a developer. 2. Go back and now access the Developer options menu, check 'USB debugging' and click OK on the prompt. This Guide Might Help You : How to Enable USB Debugging in Android Phones
In case you enabled debugging mode
on your phone and adb devices
is not listing your device, it seems there is a problem with phone driver. You might not install the usb-driver of your phone or driver might be installed with problems (in windows check in system --> device manager).
In my case, I had the same problem with My HTC android usb device which installing drivers again, fixed my problems.

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Open up your device’s “Settings”. This can be done by pressing the Menu button while on your home screen and tapping settings icon then scroll down to developer options and tap it then you will see on the top right a on off switch select on and then tap ok, thats it you all done.
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by the way its not for nexus one uts for android 4.2.2 ver. and i just switch it on in a android tablet. good luck guys. – Gurinder Singh May 02 '14 at 10:16