Unable to network unlock Galaxy S7
I have received a notification from AT&T to unlock my S7 handset.
I have followed the instructions below
Your unlock instructions:
1. Power off the device and remove the SIM card.
2. Power on the device.
3. Enter #0111*, the unlock code, and #. The device cycles off and back on.
However, nothing happens when I input the code.
If I input the code again and press the dial button I get a message saying "Not Registered to network"
Any ideas ?