https://community.m5stack.com/topic/4784/atom-dtu-nb-iot-no-connect-to-sim7020g-module/3
ATOM-DTU-NB-IOT no connect to sim7020G Module | M5Stack Community
Nov 24, 2022 - Hi Felix Thanks for the fast response! I'm pretty sure it is the SIM, while pin is removed the card is probably not valid for NB-IOT. I can also not figure o...
nb iotconnect toatomdtu