How to connect to a FDD network with NCM?

Installing and Using OpenWrt Network and Wireless Configuration
1

Hi all,
I have a router (ZLT S12 Pro [LTE, USB Modem]) that connects through NCM (QMI does not work!).
I have a sim that connects through TDD (Time Division Duplex) and works fine!

current 3ginfo:
MCC / MNC: 413 11

But when I try to use my secondary SIM, it connects and receives signals, but does not connect to the internet. "3ginfo" says I'm connected to the same MCC/MNC from before, but this SIM requires me to connect to MNC 08 (an FDD band) which is required for this specific SIM.

Is there a way to select this specific network?

I've tried

AT+COPS=1,2,"41311"

it returned "+CME ERROR: 4"

OR Why isn't that secondary SIM (FDD) connecting to the internet?

2

This is probably Tozed S12 Plus supported in snapshot.

OpenWrt has no visibility of SIMs, TDD and FDD, that is completely under control of the modem itself.
For MCC/MNC lock you should probably manually issue AT command(s) as we have no configuration settings for that, see https://openwrt.org/docs/guide-user/network/wan/wwan/ethernetoverusb_ncm

1 Like
3

This helped me: https://eko.one.pl/?p=openwrt-modemband

My secondary sim (FDD) requires me to connect band 8 so now I can change the currently connected bands with modemband.sh setbands "8".

4

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