When I insert a t-mobile data/tablet sim into my FM36M1, it connects immediately to the network and works perfectly. But when I insert an IoT sim from Telnyx or Hologram, both of which are cross-network roaming sims, the console keeps reporting “modem is initializing” and never activates. The IoT sims work and activate with no issues when inserted into a smartphone for testing.
I’ve updated the APN for each card I’ve inserted, I’ve tried connecting in different locations with different service and I’ve tried extensive troubleshooting with one of the sim vendors. I’d typically send AT commands to work this out, but those don’t seem to be available here.
Any ideas on why this might be refusing to activate on any IoT sims that work fine on other devices, while it activates fine on a (much more expensive) normal data sim?