1. Please make sure you're connected to Nommi Wi-Fi (Open Nommi app > go to Main page «Nommi» > click on Connect OR connect to Nommi via Wi-Fi settings of your device)
2. Open Nommi app > Profile page > My device > SIM settings > SIM mode\
OR
Copy 192.168.0.1 (or 192.168.173.1 to your browser, open Settings (login: admin password:admin) > System > Reboot > Select SIM mode > click Reboot.