We have 12 units in the field all mounted in various locations in the vehicle, the majority in the trunk of the vehicle.
I have at least one unit that seems to not like cold weather. We typically do not get temps that are all that low. this unit fails to connect to the LTE (VZW) network. This has happened when the temp is in the low to mid 30’s or below.
after the unit has been on for a couple of hours a restart will correct the issue.
The vendor that supports us suggested using a rugged SIM. I read the specs on both Regular and Rugged SIM cards. The temp here does not get above or below the Regular Specs; After much trouble i was able to find Rugged SIMS. I installed it in the unit yesterday and today still have the same issue.