How do I turn on USB debugging on an Android tablet or phone?

Developer options are hidden by default. On most devices, open Settings, go to About tablet or About phone, and tap Build number seven times. Android may ask for your screen lock, and shows a message that you are now a developer. On some brands the build number sits under Software information.

Then open Settings, System, Developer options, and switch on USB debugging. Names vary a little between makers, but the setting is always called USB debugging. Plug the device into the laptop with a data cable. A prompt asks whether to allow USB debugging from this computer. Tick the box to always allow and confirm.

Run adb devices on the laptop. If you see the device listed with the word device, you can paste the provisioning command. If it says unauthorized, the prompt was missed or dismissed, so unplug, replug and accept it again.

Do this on a device that has just been reset and has no Google account. Reach the home screen through the normal start without signing in, then open Settings. The device must stay free of accounts, because an added account blocks the device owner step.

After provisioning, Skie blocks developer options and adb by default, so users cannot turn debugging on again. Practical tip: a data cable matters more than people expect, so label the good ones. See how to check adb.

• Tap Build number seven times
• Switch on USB debugging in Developer options
• Accept the prompt on the device
• Skie blocks developer options after provisioning