I have TRB140, updated with newest software. The status -> overview (modem section) displays 0 Bytes received / xx Bytes sent. The router does not work, in the (ssh) console no ping works, so I have really no connection to internet. Mode Firmware ist a BETA version (I cannot find a newer Firmware image).
In the Network -> Interfaces the SIM card displays some RX and TX Bytes sent/received, Status running, so communication over the the air works, perhaps are bytes blocked between LAN and Wan?