Hey @davidc
Here is an output from CM SIM and CM Data. These are sierra SIM cards (not trial SIM cards). We have about 15 WP8548 boards sitting side by side in our office and two of the units really struggle to get on cellular networks. Below is also a log output, which is possibly also related to this forum post.
> ug 9 15:43:34 swi-mdm9x15 user.debug Legato: DBUG | sensorToCloud[918]/sensorToCloud_exe T=main | _main.c main() 69 | == Starting Event Processing Loop ==
> Aug 9 15:43:35 swi-mdm9x15 user.info Legato: INFO | sensorToCloud[918]/sensors T=main | analoginputs.c analog_initSpiHandle() 77 | Initializing SPI handle
> Aug 9 15:43:35 swi-mdm9x15 user.debug Legato: DBUG | sensorToCloud[918]/framework T=main | le_spi_client.c DoConnectService() 363 | ======= Starting another client for 'sensorToCloud.sensors.le_spi' service ========
> Aug 9 15:43:35 swi-mdm9x15 user.info Legato: INFO | sensorToCloud[918]/sensors T=main | analoginputs.c analog_initSpiHandle() 81 | SPI open result: 0
> Aug 9 15:43:35 swi-mdm9x15 user.info Legato: INFO | sensorToCloud[918]/avPublisher T=main | avPublisher.c _avPublisher_COMPONENT_INIT() 1004 | sensorToCloud started
> Aug 9 15:43:35 swi-mdm9x15 user.debug Legato: DBUG | sensorToCloud[918]/framework T=main | LE_FILENAME le_mem_ForceAlloc() 841 | Memory pool 'framework.Default Timer Pool' overflowed. Expanded to 2 blocks.
> Aug 9 15:43:35 swi-mdm9x15 user.debug Legato: DBUG | sensorToCloud[918]/framework T=main | LE_FILENAME le_mem_ForceAlloc() 841 | Memory pool '.le_avdata_ClientData' overflowed. Expanded to 1 blocks.
> Aug 9 15:43:35 swi-mdm9x15 user.warn Legato: -WRN- | dcsDaemon[826]/le_pa_dcs T=main | pa_dcs_linux.c pa_dcs_SetDefaultGateway() 568 | Default gateway or interface is empty
> Aug 9 15:43:35 swi-mdm9x15 user.debug Legato: DBUG | sensorToCloud[918]/framework T=main | LE_FILENAME le_timer_Start() 1260 | threadRecPtr->timerFD=16
> Aug 9 15:43:35 swi-mdm9x15 user.debug Legato: DBUG | sensorToCloud[918]/framework T=main | LE_FILENAME le_mem_ForceAlloc() 841 | Memory pool 'framework.FdMonitor' overflowed. Expanded to 11 blocks.
> Aug 9 15:43:35 swi-mdm9x15 user.debug Legato: DBUG | sensorToCloud[918]/framework T=main | LE_FILENAME le_mem_ForceAlloc() 841 | Memory pool 'framework.hashMap_refFdMonitors' overflowed. Expanded to 12 blocks.
> Aug 9 15:43:35 swi-mdm9x15 user.warn Legato: -WRN- | modemDaemon[875]/le_pa T=main | pa_sim_qmi.c MapSimState() 858 | More than one application 2
> Aug 9 15:43:35 swi-mdm9x15 user.warn Legato: -WRN- | modemDaemon[875]/le_pa T=main | pa_sim_qmi.c MapSimState() 858 | More than one application 2
> Aug 9 15:43:35 swi-mdm9x15 user.info Legato: INFO | modemDaemon[875]/le_pa T=main | pa_mrc_qmi.c pa_mrc_GetNetworkRegState() 2062 | called
> Aug 9 15:43:35 swi-mdm9x15 user.warn Legato: -WRN- | modemDaemon[875]/le_pa T=main | pa_sim_qmi.c MapSimState() 858 | More than one application 2
> Aug 9 15:43:56 swi-mdm9x15 user.debug kernel: [ 60.891927] NMEA read driver miss interrupt, abandon current buff
> Aug 9 15:44:12 swi-mdm9x15 user.debug kernel: [ 76.891896] NMEA read driver miss interrupt, abandon current buff
> Aug 9 15:44:20 swi-mdm9x15 user.info Legato: INFO | supervisor[487]/supervisor T=main | supervisor.c HandleRebootExpiry() 524 | Expired reboot timer
> Aug 9 15:44:24 swi-mdm9x15 user.warn Legato: -WRN- | modemDaemon[875]/le_pa T=main | pa_sim_qmi.c MapSimState() 858 | More than one application 2
> Aug 9 15:44:26 swi-mdm9x15 user.info Legato: INFO | gpsMonitor[863]/location T=main | location.c getLocation() 87 | Failed to get reading... retrying in 1 seconds
> Aug 9 15:44:28 swi-mdm9x15 user.debug kernel: [ 92.891683] NMEA read driver miss interrupt, abandon current buff
> root@swi-mdm9x15:~#