RM500Q-AE cannot connect to network

Hello,

I have RM500Q-AE modem with the firmware version RM500QAEAAR13A02M4G

I have my modem connected in an embedded computing platform running Ubuntu 20.04.5 LTS.

My problem is the modem cannot connect to the mobile network at all.

When I run modem manager in debug mode, I see that it keeps printing “not yet registered in a 3GPP network… will recheck soon.” Eventually, it timed out with “3GPP registration check timed out” and failed to connect.

I have checked that the SIM card is working and unlocked, etc. I have the “data-only” SIM card. As far as I have tried and looked a lot around this forum, I got all correct information from the modem regarding the settings, signals, etc.

Could you please help?

Get rid of ModemManager.
Show the output of the following commands:

AT+CSQ
AT+COPS?
AT+QENG="servingcell"
AT+QENG="neighbourcell"
AT+CEREG?
AT+CGDCONT?
AT+CGPADDR
AT+QNWPREFCFG="nr5g_disable_mode"
AT+QNWPREFCFG="mode_pref"

AT+CSQ

+CSQ: 31,99

OK

AT+COPS?

+COPS: 0,0,“Telia Telia”,13

OK

AT+QENG=“servingcell”

+QENG: “servingcell”,“NOCONN”
+QENG: “LTE”,“FDD”,240,01,1886415,235,1300,3,5,5,332,-78,-8,-48,21,15,-140,-
+QENG: “NR5G-NSA”,240,01,58,-92,29,-11,634080,78,12,1

OK

AT+QENG=“neighbourcell”

+QENG: “neighbourcell intra”,“LTE”,1300,235,-16,-78,-39,-,49,6,16,12,62
+QENG: “neighbourcell inter”,“LTE”,3150,-,-,-,-,-,49,6,6,14
+QENG: “neighbourcell inter”,“LTE”,1471,-,-,-,-,-,0,6,6,14
+QENG: “neighbourcell inter”,“LTE”,9360,-,-,-,-,-,0,5,6,14
+QENG: “neighbourcell inter”,“LTE”,6300,-,-,-,-,-,0,5,6,14
+QENG: “neighbourcell inter”,“LTE”,3768,-,-,-,-,-,0,4,6,14

OK

AT+CEREG?

+CEREG: 0,1

OK

AT+CGDCONT?

+CGDCONT: 1,“IPV4V6”,“online.telia.se”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0,“”,0
+CGDCONT: 2,“IPV4V6”,“ims”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0,“”,0
+CGDCONT: 3,“IPV4V6”,“sos”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,1,“”,0
+CGDCONT: 4,“IPV4V6”,“hos”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0,“”,0
+CGDCONT: 5,“IPV4V6”,“mms.telia.se”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0,“”,0

OK

AT+CGPADDR

+CGPADDR: 1,“78.78.167.146”
+CGPADDR: 2,“”
+CGPADDR: 3,“”
+CGPADDR: 4,“”
+CGPADDR: 5,“”

OK

AT+QNWPREFCFG=“nr5g_disable_mode”

+QNWPREFCFG: “nr5g_disable_mode”,0

OK

AT+QNWPREFCFG=“mode_pref”

+QNWPREFCFG: “mode_pref”,AUTO

OK

I see no issues - you’re registered and have an address.

It does seem so, but I could not reach an internet using only this connection. I am quite new to using mobile network on such a computer. Is there any extra step to set it up so that the computer uses this mobile connection as a primary network connection?

Could the problem be on the mobile network operator side then?

The simplest setup is to configure the modem in ECM mode and setup a DHCP interface on the host side.
I see no problem on either modem or operator side yet.

Is there a good guide on how to setup the modem in EMC mode and setup a DHCP interface on the host side anywhere that I can try to follow? Thank you very much in advance.

Search forum for “ECM”.

Unrelated to Quectel. That part assumes basic knowledge of Linux networking.

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