Adafruit FONA 32u4 no network

I’ve been using a SIMCOM868 dev board and now switched to FONA for smaller form factor. The Feather appears not to register on the network. I know the SIM works as it’s the same one i’ve used in the SIMCOM868 dev board. The SIM is enabled for all networks and is not the issue, i suspect the fault is with the FONA board. Any help appreciated.