1) If no SIM card is detected, power off your CPE, and reinsert the SIM card,then try again.
2) If a PIN code is required, enter the PIN code, and try again.
3) If no network is available, place the CPE in an area with better signal (for example near a window), and try again.
4) Reboot your CPE, and try again.
5) If MAC address filtering is enabled, make sure your device’s MAC address is on the approved list.