I’ve been using a MAX Transit for a while, hard wired to my batteries in an RV. There are specific devices that can connect at times but not at other times, while other devices always connect without any issues. I am using the same SIM in all cases. These devices have issues:
Ecobee3 Lite Thermostat
Nest Protect Smoke Detectors
TP-Link Smart Plugs
In contrast, I have a Nest Hub that has never failed to connect to the MAX. Right now, I can connect all three of the above devices to another hotspot with a different SIM. Is the MAX preventing these connections? What should I check? Thanks for your help!