Nokia 5G Gateway 3.1 modem From Nokia, and it was working on all SIM cards. I inserted a Zain SIM card into it, and it locked to other SIM cards, even though it is not from Zain. I searched for unlocking it and found many videos, but I couldn't apply them. Anyway, it works with a Zain SIM card. The device is very, very excellent in terms of cleanliness and internet speed.