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  • Case ID: 287872
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Cannot connect to T-Mobile NB-IoT on NRF9160

user113410

Hello!

I have been trying to connect to T-Mobile's NB-IoT network using a NRF9160DK with a Twilio Narrowband sim, but have been unsuccessful so far. I have been able to successfully run applications on LTE connections using both a Twilio sim on T-Mobile's network as well as with an iBasis sim, but when I switch to NB-IoT it does not work properly. I am located in northern VA near DC and T-Mobile does have NB-IoT coverage here.

I was looking over past threads and found this one: https://devzone.nordicsemi.com/f/nordic-q-a/61681/nrf9160-doesn-t-connect-over-nb-iot-ibasis-and-t-mobile-works-fine-on-cat-m, which seems to conclude that T-Mobile does not allow Nordic boards to connect to their network. However that was 2 years ago.

Does anyone know if T-Mobile allows Nordic boards to connect to their NB-IoT network, and if not are there any other services in the US that work for NB-IoT?

Thanks!

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    Hi Luke,

    Thanks for your information. I talk with an expert who has been involved in Nordic chip T-Mobile certification. I confirmed that we are certified with T-mobile US, but they are slow to update their own pages, he will ping internally again so they can get nrf9160 onto their page. He also gives me some hints about your issue:

    1) Except One note to be aware of is "4 T-Mobile US requires LwM2M carrier library for nRF9160 modem firmware version 1.3.1 and newer.", you should also make sure your device is using the B1 version of  nRF9160. nRF9160DK started to use B1 from v1.0.0, you can find the version mark from the chip surface.

    2) Any chance to test with a sim card from T-Mobile directly?

    Best regards,

    Charlie

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  • 0

    Hi Luke,

    Thanks for your information. I talk with an expert who has been involved in Nordic chip T-Mobile certification. I confirmed that we are certified with T-mobile US, but they are slow to update their own pages, he will ping internally again so they can get nrf9160 onto their page. He also gives me some hints about your issue:

    1) Except One note to be aware of is "4 T-Mobile US requires LwM2M carrier library for nRF9160 modem firmware version 1.3.1 and newer.", you should also make sure your device is using the B1 version of  nRF9160. nRF9160DK started to use B1 from v1.0.0, you can find the version mark from the chip surface.

    2) Any chance to test with a sim card from T-Mobile directly?

    Best regards,

    Charlie

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