HPPLMN search - reason unknown

RE: HPPLMN search - reason unknown

Achim Kraus — Wed, 14 Jun 2023 19:11:01 GMT

With mfw 1.3.5, the modem will not longer search for the 90140.

See mfw_nrf9160_1.3.5_release_notes.txt:

- Fix for higher priority PLMN search. Global PLMN IDs (start with digit 9) are no more
automatically considered to be suitable for higher priority PLMN search and selection.

RE: HPPLMN search - reason unknown

Achim Kraus — Tue, 20 Dec 2022 17:20:58 GMT

Let me close this issue. That's beyond a user's possibility.

I'm not sure, if the modem will ever find such a global PLMN.

That's a question left to 3GPP or the MVNOs.

RE: HPPLMN search - reason unknown

Achim Kraus — Tue, 20 Dec 2022 16:33:31 GMT

Is that "home network" configured on the SIM-card? How could that be read?

Edit: I think, it's the IMSI header.

RE: HPPLMN search - reason unknown

Achim Kraus — Tue, 20 Dec 2022 16:19:16 GMT

Thanks, I will forward that to the MVNO.

RE: HPPLMN search - reason unknown

Charlie — Tue, 20 Dec 2022 16:02:51 GMT

Hi Achim,

Please analyze, why the modem starts these HPPLMN searches.

My understanding is, it is always the PLMN 26201, which is the configured HPPLMN. I don't see the reason, why the searches are executed.

26201 is not the highest priority network. The highest priority network is home network which is 90140. That is why the HPPLMN search must be done and cannot be skipped. Btw, HPLMN seems to have a global PLMN ID (starts with 9). According to 3GPP HPPLMN can only be a PLMN that is in the same country the device currently is located. But because the HPLMN is a global PLMN, it must be searched not matter where the device is located at because such network could be found anywhere. In this log HPLMN 90140 was never found.

Best regards,

Charlie