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Today Lobaro is using the Nordic nRF9160 in most of it's products. Beside that app the Modem Firmware from Nordic is running on a separate core.
Known issues
Modem Firmware < 1.3.0 does not support LTE-M and NB-IoT at the same time (relevant until 10/2022)
When enabling both LTE-M and NB-IoT in a Lobaro Firmware that runs with Modem Firmware < 1.3.0 the Modem can not do a fallback to LTE-M when NB-IoT is not available and thus the firmware only uses NB-IoT in that case.
With Modem Firmware >= 1.3.0 a proper fallback is implemented.
nrf9160 SICA vs. SIBA (no LTE-M) (relevant until ~12/2021)
The nrf9160 SIBA only supports NB-IoT but not LTE-M. Since late 2021 Lobaro only uses the nrf9160 SICA which supports both NB-IoT and LTE-M.