Samsung I9500 Galaxy S4: Turn ON USB Debugging Option
Samsung Galaxy S4 users: if you want to connect your android mobile device with your computer desktop or laptop using USB cable. You need to enable USB debugging option in your android phone. We are showing you step by step process to turn on USB debugging mode. Using DRPU Bulk SMS Software you can send multiple text messages, notifications (flash SMS), unicode messages etc from Samsung Galaxy S4 android device connected to PC.

Tap on Apps and go to phone Settings screen.

Firstly tap 'More' on upper right corner of the screen. Select 'About device' option and then tap 7 times on Build number.

After touching seventh time you see a message that says 'Developer mode has been enabled'. Now go back and select 'Developer options'.

Now tick mark the box in front of USB debugging to enable it. Tap OK to allow USB debugging option.

That's it guys! now you have successfully enabled USB debugging mode. (To disable USB debugging unmark the box in front of USB debugging.)