NB-IoT attaching to T-mobile, USA



  • Hi folks,

    we are currently trying to connect a Gpy to

    T-Mobile, US      (Bellevue, Washington)
    

    without success, yet. We are using a local T-mobile SIM card for that.

    From experiments with an ublox based system we know that NB-IoT is available there.

    We are told to use bands 2 and 4 and to specify "nb.iot" as the local APN.

    We are, however, still not able to attach() to the net.

    Did anyone succeed to connect to T-mobile US there?
    Would you be so kind to share the connection parameters/procedure with us?

    Our code currently looks like this:

    lte=LTE()
    lte.send_at_cmd('AT!="addscanband band=2"')
    lte.send_at_cmd('AT!="addscanband band=4"')
    lte.send_at_cmd('AT+CGDCONT=1,"IP","nb.iot"')
    lte.send_at_cmd('AT+CFUN=1')
    
    while not lte.isattached():
      print("not attached")
      utime.sleep(1)
    


  • @Elizar we are using Hologram and T-Mobile SIMs, so I should reach out to them whitelist sequans modem chip?



  • @Envy Yes, we made it. The key was not only to choose the correct parameters but the pycom / sequans chip had to be whitelisted by the provider.



  • @Elizar were you able to connect to T-mobile network in US? I am in the Boston area and having issues with GPy connecting to T-mobile NB-IoT


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