AT Monitor Times Out

I'm using an nRF9160-DK board with the provided iBASIS SIM card. I followed the instructions here: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.0/nrf/working_with_nrf/nrf91/nrf9160_gs.html

The Location project works and I can get my GPS location (though I can't use GNSS but haven't tried the troubleshooting on that yet).

I see mention of the AT Client project as well, but I'm unsure which commands to use as of now.

AT Monitor is another project that seems like it will connect to a tower and print out the network status every so often, but it attempts to connect, prints link quality, then times out. Here is my serial output:

*** Booting nRF Connect SDK v3.5.99-ncs1 ***
AT Monitor sample started
Subscribing to notifications
Connecting to network
Resuming link quality monitor for AT notifications
Waiting for network
Link quality: -100 dBm
Network registration status: searching
Network registration status: roaming
Network connection timed out
Continuing without network
Pausing link quality monitor for AT notifications
Reading PSM info...
  PSM: enabled
  Periodic TAU string: 00000011
  Active time string: 00000100
Enabling PSM
Reading PSM info...
  PSM: enabled
  Periodic TAU string: 00000011
  Active time string: 00000100
Modem response:
+CEREG: 1,5
OK
Shutting down modem
Network registration status: no network
Bye

- Is there a specific hex file I need to flash like location and at client have in the download of the link above? I don't see a monitor hex file.

- I'm sure it won't hurt, but is an antenna required for AT Monitor to connect? This could also be why the GNSS is failing under location.

I just want to make sure monitor doesn't have its own hex file for flashing like the other two.

Thanks in advance :)

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