I've been trying to find how to do this and it took me awhile so I decided to start a thread to help others who may need to enter "Developer Mode" on the Note Tres to enable USB-Debugging for instance.
Here is how:
Step 1: Go to your Samsung Galaxy Note 3 “Application” icon and Open “Setting Option”:
Step 2: In the upper right corner of your phone screen, select “General” icon And Go on “About Device” option
Step 3: Scroll down and tap Build Number several times and you see a message that says “Developer mode has been enabled“. The phone will tell you how many times are left to enter the dev-mode
Step 4: Return to the “Phone Setting”, you will see “Developer Options”
Step 5: Check the USB debugging box under Developer options and you see a message that says “Allow USB Debugging”
Step 6: VOILA!! You are ready to use your Samsung Galaxy Note 3 in debugging mode.
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Here is how:
Step 1: Go to your Samsung Galaxy Note 3 “Application” icon and Open “Setting Option”:
Step 2: In the upper right corner of your phone screen, select “General” icon And Go on “About Device” option
Step 3: Scroll down and tap Build Number several times and you see a message that says “Developer mode has been enabled“. The phone will tell you how many times are left to enter the dev-mode
Step 4: Return to the “Phone Setting”, you will see “Developer Options”
Step 5: Check the USB debugging box under Developer options and you see a message that says “Allow USB Debugging”
Step 6: VOILA!! You are ready to use your Samsung Galaxy Note 3 in debugging mode.
source