Mobile Operator *suddenly* No Longer Found with at+cops=?

IoT Modules 5G Module
1

Greetings All! I’m pretty new to the do-it-yourself Cellular Internet stuff so please forgive me..
I have a Quectel RM520N-GL inside of an OpenWRT Machine, with the intended use being the Primary Internet Uplink for my home (as Fixed Line options are diabolical..)

I’ve been tinkering with this setup for the last 3 days, seeing whats what, how it all works, etc, and managed to get it figured out and ironed out most the issues.
However, for whatever reason, it now seems my Network Operator (EE UK) has just ceased to exist for the Modem
at+cops=? No Longer returns EE as an Operator, and only returns O2, and rarely 3(Three), both of which, I cannot use.

Manually attempting at+cops=1,2,"23430" hangs for a while, before returning CME Error 30 (no network service).
at+qeng="servingcell" Returns +QENG: "servingcell","LIMSRV","WCDMA",234,10,5473,26B5D1A,3025,112,145,-96,-11,-,-,-,-,-

SIM Card is completely fine, as all relevant AT commands return what they should, the Operator (EE) is not down, as the SIM works fine in another 5G Router I have, same goes for the 2 Antennas I am using.

The only settings I have really messed around with regarding AT Commands are at+qnwlock, at+qnwprefcfg for Cell Locking & Band Locking.
I have scoured the internet and forums alike looking for a solution to this issue to no avail. The problem occurred seemingly out of nowhere, one moment I was trying to find the best cells and bands to lock to, annnnd the next I suddenly have No Operator..
Note; I have reset all of the settings I was playing around with, ran the appropriate AT commands to clear settings, etc.

Can anyone here shed some light on this problem? I’ve just about pulled all of my hair out..

Thankyou

2

Dear @TheGooseMan
Please check the following AT commands:
AT+QCSQ
AT+COPS?
AT+QENG=“servingcell”
AT+QSCAN
AT+QNWPREFCFG=“mode_pref”
AT+QMBNCFG=“list”

3

Greetings, thank you for your reply, I meant to get back here sooner but it left my mind
I have since fixed the issue, and it was of course caused by own stupidity/naivety. I wrongly assumed that the AT Commands I used to “reset” the modules settings did not do what I expected them to do (while some settings were reset, others were not, I was under the false impression i had/could reset every single setting to factory default).

So if any one stumbles across this thread with the same issue, and you have jumped head first in to cell and band locking, do me a favour and check that at+qnwprefcfg="lte_band" is NOT 0! I stupidly thought setting it to 0 would reset or more “hey use any/all available LTE Bands” lol..
(I’m sure theres a parameter within the list for at+qnwprefcfg=? that actually resets the Bands for LTE/NSA/SA too, which I also missed!). After resetting the bands, within seconds i had CREG:1..

Hope this can help someone else in discovering their own silly mistake some day

Thankyou