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Did you activate the SIM card with Hologram? If the orange RSSI LED light isn’t coming on, then you aren’t getting any cell reception. Once you do get cell reception, the orange LED will come on (and its brightness is indicative of the strength of the signal). And a few seconds after the orange light comes on, the blue light will start blinking, which shows that you’ve successfully joined the network. The problem we’re having with several of the “dead” LTE modules is that seem to lose the ability to join the network (blinking blue LED) after a few weeks or months in use. None of them have the issue of no orange LED. I’ve only seen instances of no orange LED when there was no antenna attached, the antenna had a bad (loose) connector, and using the module where there was no AT&T or Verizon LTE signal. Have you tried communicating directly with the Xbee LTE module using X-CTU to verify any of its settings or updating its firmware?