Unlock Instructions?? Does this work SM N910A

Unit Model: SM-N910A
Lock Provided: at&t

UNLOCK INSTRUCTIONS:

Micro-USB cable:
1. Phone must be powered on.
2. Type *#0808# and select 'DM+MODEM+ADB'.
3. Type *#9090# and choose 'DM/DUN over HSIC'.
4. Reboot phone.
5. Connect USB cable, install drivers if needed.
6. Select Samsung diagnostic port in port settings.
7. Press 'Unlock' button for direct unlock.