You’ll see here in this descriptive tutorial about, how to send bulk text messages to group of phone contacts by using various properties of DRPU Text Message Sending Tool via Samsung Galaxy S4 Phone. br Watch this descriptive tutorial to learn, how to enable USB Debugging mode on your device by following simple steps including go to “Apps”, select “Settings”, tap on “Move” located at upper right corner of screen, go to “About Devices” and then tap seven times on “Build Number”, now go back one step and via “System Manager” select “Developer Option” and then check “USB Debugging” Option as shown.