Sim cards stopped working, no connect

IoT Modules
10

Steps to solve the problem

  1. As per above direction:

    AT+KBNDCFG=0,800

  2. Reboot:

    AT+CFUN=1,1

  3. See AT Coimmand Reference and also
    https://forum.sierrawireless.com/t/hl7800-m-registration-denied/20398)
    This must be done to enable step 4.

    AT+CGATT=0

  4. The 310410" in the next command is my PLMN which is the combination of my MCC and MNC. This will force the module to register to my local AT&T network.

    Look up the numbers of your local network.

    This fixes the original problem was caused by using this SIM in another module that did not use LTE Cat-M1, and the SIM had cached a network that was not capable.

    AT+COPS=1,2,“310410”

    The module should now register with the network

  5. Restore the network registration to automatic.

    AT+COPS=0