Android has an option, USB debugging, which is only useful when you have installed the Android development kit (Android SDK), needed to develop Android applications. This section specially designed for an Android developer, if you are not a developer then this section certainly does not concern you.
Step 1: Go to Settings > About phone > Software info
Step 2. Touch ” build number ” for 7 times until you reach a “You are in developer mode” note.
Step 3. Then to “Settings”, click on “Developer Options”. And ensure switch is turn on
Step 4. The last step, check “USB Debugging