FiPy does not connect to LTE

  • Hi There, I am facing an issue where the FiPy is unable to connect to the LTE. I have tried 3 different SIMs(Tmobile, AT & T and Arduino) and have the same issue.
    When I run the below code, it keeps displaying this info:

    |            FSM           |        STATE       |
    | RRC TOP FSM              |SCANNING            |
    | RRC SEARCH FSM           |WAIT_RSSI           |
    | RRC ACTIVE FSM           |NULL                |
    | PMM PLMN FSM             |NORM_WAITCELL       |
    | EMM MAIN FSM             |NULL                |
    | EMM AUTH FSM             |NULL                |
    | EMM CONN FSM             |NULL                |
    | EMM TAU FSM              |NULL                |
    | EMM TEST FSM             |NULL                |
    | ESM BEARER FSM           |BEARER_NULL         |
    | SMS MT FSM               |IDLE                |
    | SMS MO FSM               |IDLE                |
    | LPP FSM                  |IDLE                |
    | HP MAIN FSM              |IDLE                |
    | HP USIM FSM              |READY               |
    | HP SMS MO FSM            |IDLE                |
    | HP SMS MT FSM            |IDLE                |
    | HP CAT FSM               |IDLE                |
    from network import LTE
    import time
    import socket
    lte = LTE()
    #some carriers have special requirements, check print(lte.send_at_cmd("AT+SQNCTM=?")) to see if your carrier is listed.
    #when using verizon, use
    #when usint AT&T use,
    #some carriers do not require an APN
    #also, check the band settings with your carrier
    lte.attach(band=20, apn="your apn")
    while not lte.isattached():
        print(lte.send_at_cmd('AT!="fsm"'))         # get the System FSM
    print("connecting [##",end='')
    while not lte.isconnected():
    print("] connected!")
    print(socket.getaddrinfo('', 80))  
    #now we can safely machine.deepsleep()

  • Please check the page here: Can you confirm the simcards are specifically for NB-IoT and/or CAT-M1 LTE networks, and not the regular 4G mobile phone simcards? also confirm with the carrier whether the there is coverage in your region

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