During our ice storm this winter, we were out of power and cable internet for 8 days. Due to the power outage, my area's T-Mobile towers weren't working but the ATT towers were.
So... I eventually figured out I could put the T4R in accessory mode and use the truck's ATT hotspot for cell data. The drawback was that it would only stay on for 20 mins. In
@
Saker
's post, it looks like I could have turned the ignition to ON and it would have kept my hotspot going for 1 hour.