How is LTE carrier switching performed on the MX67C integrated LTE modem?  I have two SIM cards, one AT&T and one Verizon. Both have been activated with the IMEI address of the MX67C's integrated LTE modem. the modem will only come up and connect on Verizon. When the AT&T SIM card is installed modem status simply says "Enabled" and shows no LTE connection.   Does the MX67C automatically switch LTE carriers based on inserted SIM card, or do I have to manually do some process when moving from AT&T to Verizon? ... View more

How does one upgrade the modem firmware of the integrated LTE modem in the MX67C?  Does the modem FW get upgraded at the same time as the MX operating system upgrade? I can't find any mention of modem software upgrade in the Dashboard or documentation. ... View more