Can't connect to 5G network rm520n-gl

Hello, i’ve been trying to connect to a 5G network with my rm520n-gl device. When executing the corresponding at commands, i see that there are 5G cells available but my device still only connects to the 4G network. Is there any way i can connect to a cell manually or force the modem to connect to a cell of my choice?
When executing

AT+QNWPREFCFG="mode_pref",NR5G

i always get “no service” as a response and with

AT+QNWPREFCFG="mode_pref",AUTO

i can only get a connection to the 4G network.
Any problems with the network provider have been ruled out since i can use the same SIM-card to connect to 5G via my cell phone.

Thank you for your help.

Dear @luba
Please confirm which band your cell phone.
It is not sure whether your region has SA network.

My cell phone is a iPhone 15 Pro if that is what you meant. If you wanted to know what 5G band my cell phone is connecting to, then i don’t know how i can see that on my cell phone. There is no option for that in the settings.
My region has 5G network access by Vodafone germany, although i don’t know for sure whether its a NSA oder SA network. Do i need 5G SA network access for the RM520N-GL chip to work?

For NSA 5G the command is
AT+QNWPREFCFG=“mode_pref”,NR5G:LTE

Okay, thank you. I will try that asap

My experience is that the RM520 works on NSA networks with
AT+QNWPREFCFG=“mode_pref”,NR5G:LTE

but fails on SA networks.

Here’s a capture from a Vodafone Ultra location:

AT+QNWPREFCFG=“mode_pref”,NR5G:LTE
OK
AT+QENG=“servingcell”
+QENG: “servingcell”,“NOCONN”
+QENG: “LTE”,“FDD”,234,15,3E3E1C,253,2850,7,5,5,E023,-95,-8,-66,20,10,219,-
+QENG: “NR5G-NSA”,234,15,735,-105,8,-11,628032,78,7,1
OK
AT+QNWPREFCFG=“mode_pref”,NR5G
OK
AT+QENG=“servingcell”
+QENG: “servingcell”,“SEARCH”
OK
AT+QENG=“servingcell”
+QENG: “servingcell”,“LIMSRV”,“NR5G-SA”,“TDD”,234,15,0082C81A3,873,266C3,634080,77,6,-109,-11,5,1,15
OK
AT+QENG=“servingcell”
+QENG: “servingcell”,“LIMSRV”,“NR5G-SA”,“FDD”,234,15,00639801B,180,266C3,428190,1,2,-95,-12,6,0,29
OK
AT+QENG=“servingcell”
+QENG: “servingcell”,“LIMSRV”,“NR5G-SA”,“FDD”,234,15,00639801B,180,266C3,428190,1,2,-95,-12,1,1,29

Is there a setting I need to enable to allow public 5G SA?

Thanks.

Tim.

It also could be that the modem is not certified to be used on your carrier 5G network. You can try to test that out by spoofing your modem IMEI to a device that is supported.

1 Like

Thanks, I just tried setting an IMEI and it still did not work.
Looks like Vodafone 5G Ultra UK isn’t compatible with the Quectel modules.

The 5G SA network works on your phone but fails to connect on the Quectel module?

@Semsem I can’t say that for sure. The phone and the module are in different places. So it is possible the signal is too weak for the module, but I have seen the module connect to a private SA 5g net, so I do think that is is a Vodafone Ultra related problem.

I tested the modem now with

AT+QNWPREFCFG="mode_pref",NR5G:LTE

and i get as response

AT+QNWINFO
+QNWINFO: "FDD LTE","26202","LTE BAND 1",100

OK
AT+QENG="servingcell"
+QENG: "servingcell","NOCONN","LTE","FDD",262,02,FBDC15,271,100,1,5,5,B574,-94,-12,-60,9,5,219,-

OK

Is there any way to confirm that my modem is currently using an 5G NSA network? Because it seems like its just connecting to an LTE network.

When testing with

AT+QNWPREFCFG="mode_pref",NR5G

i get

AT+QENG="servingcell"
+QENG: "servingcell","LIMSRV","NR5G-SA","FDD",262,02,000D0C0DD,29,B574,372750,3,3,-86,-11,7,0,31

OK
AT+QNWINFO
+QNWINFO: No service

OK

It seems like my modem is able to find a 5G SA network but it just won’t or can’t connect to it. Is there any way to fix this?

You’re only connecting to the LTE network

AT+QNWPREFCFG=“mode_pref”,NR5G

Even though you get the below response after the above command it doesn’t actually mean 5G SA is detected AT+QENG=“servingcell”
+QENG: “servingcell”,“LIMSRV”,“NR5G-SA”,“FDD”,262,02,000D0C0DD,29,B574,372750,3,3,-86,-11,7,0,31

I also get a similar response despite my area having no 5G SA at all. Anyway, I think you’re sure you have 5G in your location but the modem is only connecting to LTE. I think this can happen because your carrier only certifies certain devices to be able to connect to their 5G network. Did you attempt to temporarily spoof your imei into something that is able to connect to their 5G? Make sure you don’t connect both devices to the network with same imei simultaneously.

Thank you for your help. How can i spoof my IMEI to my cell phone for example? I have never done this…

I will send the command in the chat window because I am not sure if it is something allowed or not here…