Where is USB debugging? How does USB debug mode open?

What is the USB debug mode?

USB Debug mode is an Android-enabled feature that allows you to copy data between your computer and Android devices, install applications on mobile devices, read log data, and so on. By default, the USB debug mode is turned off, so you need to manually open it;
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Turn on USB debug mode

Android 1.5~2.3, you can enter the "Settings"-> "Application"-> "development"-> "USB debugging" to check, but different mobile phones because ROM is not the same. There may be subtle differences.
Android 4.0.X, click "Settings" → "Developer Options" → "usb debugging" to check
Android 4.1.X, click "Settings" → "Developer Options" → "top right corner open development mode" → "USB debugging Mode" to check
Android 4.2~4.3, click "Set" → "about mobile phone" → "version number (consecutive double click Back to the main menu)" → "Developer Options" → "Open development mode in the upper right Corner" → "usb debug mode" to check

OPhone system, connect USB cable, select ADB in main screen pop-up window

Aliyun system, Cloud OS2012, need accessibility tools to turn on debugging, Cloud OS2.0 is turned on by default, but the system is closed and unusable

Android phone open USB debug mode diagram

2.1 ~ 2.3.7 System Open method

• Click on the phone Menu key (menus key) , select from the menu that pops up settings (Setting) , or find settings in the application Program Click to enter

• Access to the application settings interface to open USB debug mode

4.0 ~ 4.1.2 System Open Method

• Click on the phone Menu key (menus key) , select from the menu that pops up settings (Setting) , or find settings in the application Program Click to enter

• Enter the Setup interface Developer Options can open USB Debug Mode

4.2 System Open method

• Click on the Phone menu button, select Settings (Setting)in the pop-up menu, or locate the Setup program in the application to click Enter

• Click on mobile phone

• continuously clicks seven times version number

• back to Settings menu interface Select developer Option

• Click to open the upper right corner of the switch , You can turn on USB debugging mode ,