Unlock Nighthawk M1
I have received an unlock code from ATT to unlock my Nighthawk mobile router (hotspot)
Instructions say to use "non ATT" sim card. I did using a friends Verizon sim card.
Unlock did not work following instructions provided.
ATT customer support says the verizon sim card used has to recognize the IMEI of my Nighthawk.
What does that mean and how do I accomplish this?