Currently the MM_IFACE_MODEM_3GPP_EPS_NETWORK_SUPPORTED property, which defines if CEREG checks are done, is set per plugin when the modem is created. E.g. the Altair LTE device, which is LTE-only sets it.

For devices that report 4G capabilities, though, CEREG checks should be enabled by default, and so the MM_IFACE_MODEM_3GPP_EPS_NETWORK_SUPPORTED should be set automatically.

Moreover, if a device is 4G-only, we may also want to disable CREG and CGREG checks automatically, by setting as FALSE both MM_IFACE_MODEM_3GPP_CS_NETWORK_SUPPORTED and MM_IFACE_MODEM_3GPP_PS_NETWORK_SUPPORTED.