Hello,
It seems like the device can only see a few nearby B20 cells, and they have a very weak signal. Make sure that all of the antennas are screwed in properly, and that your device is positioned near a window facing the cell tower.
If that does not help, perhaps you could try testing the device closer to a cell tower and see if it connects? If the device connects, investing in a directional antenna might be the only option. We have an article about third-party antennas here.
Best regards,
DaumantasG