Problem with cellular connection failing repeatedly

[rbebeau]

I have been having issues with the cellular connection failing even in an area where there should be good signal quality.

Environment

2013 Nissan Leaf
OVMS module
Firmware 3.3.004-396-geb3d1636
OVMS v3 MQTT server to my own system
Hologram SIM card

Issue

I have been experiencing a problem ever since I received the new OVMS system a month ago. I am using a hologram SIM card and have tried to debug the issue with them, but they were not able to help. It seems that OVMS tries to establish a PPP connection but after establishing the connection 'NO CARRIER' is received and then after that a loop occurs and the connection is not reestablished.

I set 'log level debug cellular' to try to see what's going on, but I don't see anything obvious on my side to know why 'NO CARRIER' happens after it does establish the PPP session sucessfully.

Sample Logs

I am showing a session where I start up the modem (from shut down state) to see the PPP session establishing and then immediately getting a 'NO CARRIER' followed by the looping.

If there are further commands or logs that would help to you (or me) to debug the issue, please let me know.

D (55193464) cellular: State timeout PowerOffOn => PoweringOn
I (55193464) cellular: State: Enter PoweringOn state
I (55193464) cellular-modem-auto: Power Cycle 4000ms
D (55197464) cellular: tx-cmd: AT
D (55197464) cellular: tx-cmd: AT
D (55197464) cellular: tx-cmd: AT
D (55197464) cellular: tx-cmd: AT
D (55198464) cellular: tx-cmd: AT
D (55199464) cellular: tx-cmd: AT
D (55200464) cellular: tx-cmd: AT
D (55201464) cellular: tx-cmd: AT
D (55202464) cellular: tx-cmd: AT
D (55203464) cellular: tx-cmd: AT
D (55204464) cellular: tx-cmd: AT
D (55205464) cellular: tx-cmd: AT
D (55206464) cellular: tx-cmd: AT
D (55207464) cellular: tx-cmd: AT
D (55208464) cellular: tx-cmd: AT
I (55208554) cellular: State: Enter Identify state
D (55209464) cellular: tx-cmd: AT+CGMM
I (55209474) cellular: Identified cellular modem: SIM7600/Experimental support for SIMCOM SIM7600
D (55209474) cellular: Remove old 'auto' modem driver
I (55209474) cellular: Set modem driver to 'SIM7600'
I (55209474) cellular: State: Enter PoweredOn state
D (55210664) cellular: mux-rx-line #0 (2/16): OK
D (55210664) cellular: mux-rx-line #0 (12/0): +CPIN: READY
D (55211884) cellular: mux-rx-line #0 (8/0): SMS DONE
D (55219464) cellular: tx-cmd: AT+CPIN?;+CREG=1;+CGREG=1;+CEREG=1;+CTZU=1;+CTZR=1;+CLIP=1;+CMGF=1;+CNMI=1,2,0,0,0;+CSDH=1;+CMEE=2;+CSQ;+AUTOCSQ=1,1;E0;S0=0
D (55219494) cellular: mux-rx-line #0 (124/37): AT+CPIN?;+CREG=1;+CGREG=1;+CEREG=1;+CTZU=1;+CTZR=1;+CLIP=1;+CMGF=1;+CNMI=1,2,0,0,0;+CSDH=1;+CMEE=2;+CSQ;+AUTOCSQ=1,1;E0;S0=0
D (55219494) cellular: mux-rx-line #0 (12/21): +CPIN: READY
D (55219494) cellular: mux-rx-line #0 (11/6): +CSQ: 99,99
D (55219494) cellular: mux-rx-line #0 (2/0): OK
D (55221464) cellular: tx-cmd: AT+CGMR;+ICCID
D (55221484) cellular: mux-rx-line #0 (22/38): +CGMR: LE20B05SIM7600G
D (55221484) cellular: mux-rx-line #0 (28/6): +ICCID: 89464XXXXXXXXXXXXX
D (55221484) cellular: mux-rx-line #0 (2/0): OK
D (55229464) cellular: tx-cmd: AT+CMUX=0;+CATR=6
D (55229474) cellular: mux-rx-line #0 (2/0): OK
I (55229474) cellular: State: Enter MuxStart state
I (55229474) gsm-mux: Start MUX
I (55229484) gsm-mux: Channel #0 is open
I (55229494) gsm-mux: Channel #1 is open
I (55229504) gsm-mux: Channel #2 is open
I (55229514) gsm-mux: Channel #3 is open
I (55229524) gsm-mux: Channel #4 is open
D (55230464) cellular: State transition MuxStart => NetWait
I (55230464) cellular: State: Enter NetWait state
I (55230464) gsm-nmea: Startup
D (55230464) cellular: mux-tx #1: AT+CGPS=0
D (55232464) cellular: mux-tx #1: AT+CGPSNMEA=258
D (55232484) cellular: mux-tx #1: AT+CGPSINFOCFG=5,258
D (55232504) cellular: mux-tx #1: AT+CGPS=1,1
D (55232504) cellular: mux-rx-line #1 (2/0): OK
D (55232504) cellular: mux-rx-line #1 (2/0): OK
D (55232504) cellular: mux-rx-line #1 (2/0): OK
D (55232514) cellular: mux-rx-line #1 (2/0): OK
D (55240464) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (55240484) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
I (55240484) cellular: Network Registration status: Searching
D (55240484) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (55240484) cellular: mux-rx-line #3 (11/54): +CEREG: 1,4
D (55240484) cellular: mux-rx-line #3 (29/21): +CCLK: "25/03/05,10:51:08-20"
D (55240494) cellular: mux-rx-line #3 (11/6): +CSQ: 99,99
D (55240494) cellular: mux-rx-line #3 (2/0): OK
D (55241464) cellular: mux-tx #3: AT+CPSI?
D (55241474) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (55241474) cellular: mux-rx-line #3 (2/0): OK
D (55242464) cellular: mux-tx #3: AT+COPS?
D (55242474) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (55242474) cellular: mux-rx-line #3 (2/0): OK
D (55250464) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (55250484) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (55250484) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (55250484) cellular: mux-rx-line #3 (11/54): +CEREG: 1,4
D (55250484) cellular: mux-rx-line #3 (29/21): +CCLK: "25/03/05,10:51:18-20"
D (55250484) cellular: mux-rx-line #3 (11/6): +CSQ: 99,99
D (55250484) cellular: mux-rx-line #3 (2/0): OK
D (55251464) cellular: mux-tx #3: AT+CPSI?
D (55251474) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (55251474) cellular: mux-rx-line #3 (2/0): OK
D (55252464) cellular: mux-tx #3: AT+COPS?
D (55252474) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (55252474) cellular: mux-rx-line #3 (2/0): OK
D (55256104) cellular: mux-rx-line #3 (11/0): +CSQ: 20,99
D (55256104) cellular: Signal Quality is: 20 (-73 dBm)
D (55256124) cellular: mux-rx-line #3 (8/26): +CREG: 5
I (55256124) cellular: Network Registration status: RegisteredRoaming
D (55256124) cellular: mux-rx-line #3 (9/13): +CGREG: 5
D (55256124) cellular: mux-rx-line #3 (9/0): +CEREG: 5
D (55256124) cellular: mux-rx-line #3 (28/0): +CTZV: -20,25/03/05,15:51:24
D (55256464) cellular: State transition NetWait => NetStart
I (55256464) cellular: State: Enter NetStart state
D (55257464) cellular: Netstart AT+CGDCONT=1,"IP","hologram";+CGDATA="PPP",1
D (55257524) cellular: mux-rx-line #2 (14/0): CONNECT 115200
I (55257524) cellular: PPP Connection is ready to start
D (55258464) cellular: State transition NetStart => NetMode
I (55258464) cellular: State: Enter NetMode state
I (55258464) gsm-ppp: Initialising...
I (55258614) gsm-ppp: StatusCallBack: None
I (55258614) gsm-ppp: status_cb: Connected
I (55258614) gsm-ppp:    our_ipaddr  = 10.200.252.205
I (55258614) gsm-ppp:    his_ipaddr  = 10.64.64.64
I (55258614) gsm-ppp:    netmask     = 255.255.255.255
I (55258614) gsm-ppp:    DNS#0       = 8.8.8.8
I (55258614) gsm-ppp:    DNS#1       = 8.8.4.4
I (55258614) gsm-ppp:    our6_ipaddr = ::
I (55258614) netmanager: Set DNS#1 0.0.0.0
I (55258614) netmanager: Set DNS#2 0.0.0.0
I (55258614) netmanager: MODEM up (with WIFI client up): staying with WIFI client priority
D (55264784) cellular: mux-rx-line #3 (10/0): NO CARRIER
D (55264784) cellular: mux-rx-line #3 (19/0): +PPPD: DISCONNECTED
I (55264784) cellular: PPP Connection disconnected
W (55265464) cellular: Lost network connection (+PPP disconnect in NetMode)
D (55265464) cellular: State transition NetMode => NetLoss
I (55265464) cellular: State: Enter NetLoss state
D (55265464) cellular: mux-tx #3: AT+CGATT=0
I (55265464) gsm-ppp: Shutting down (hard)...
I (55265464) gsm-ppp: PPP is shutdown
I (55265464) netmanager: Set DNS#1 0.0.0.0
I (55265474) netmanager: Set DNS#2 0.0.0.0
I (55265474) netmanager: MODEM down (with WIFI client up): staying with WIFI client priority
I (55266464) ovms-server-v3: Transmit all metrics
I (55270764) gsm-ppp: StatusCallBack: User Interrupt
D (55275464) cellular: State timeout NetLoss => NetWait
I (55275464) cellular: State: Enter NetWait state
D (55279464) cellular: State transition NetWait => NetStart
I (55279464) cellular: State: Enter NetStart state
D (55280464) cellular: Netstart AT+CGDCONT=1,"IP","hologram";+CGDATA="PPP",1
D (55281964) cellular: mux-rx-line #3 (11/0): +CSQ: 99,99
D (55281964) cellular: Signal Quality is: 99 (0 dBm)
D (55281964) cellular: mux-rx-line #3 (2/0): OK
D (55281964) cellular: mux-rx-line #3 (8/0): +CREG: 2
I (55281974) cellular: Network Registration status: Searching
D (55282004) cellular: mux-rx-line #2 (14/0): CONNECT 115200
I (55282004) cellular: PPP Connection is ready to start
D (55282464) cellular: State transition NetStart => NetMode
I (55282464) cellular: State: Enter NetMode state
I (55282464) gsm-ppp: Initialising...
D (55282584) cellular: mux-rx-line #3 (10/0): NO CARRIER
D (55282584) cellular: mux-rx-line #3 (19/0): +PPPD: DISCONNECTED
I (55282584) cellular: PPP Connection disconnected
W (55283464) cellular: Lost network connection (NetworkRegistration in NetMode)
D (55283464) cellular: State transition NetMode => NetLoss
I (55283464) cellular: State: Enter NetLoss state
D (55283464) cellular: mux-tx #3: AT+CGATT=0
I (55283464) gsm-ppp: Shutting down (hard)...
I (55283464) gsm-ppp: PPP is shutdown
I (55283474) netmanager: Set DNS#1 0.0.0.0
I (55283474) netmanager: Set DNS#2 0.0.0.0
D (55293464) cellular: State timeout NetLoss => NetWait
I (55293464) cellular: State: Enter NetWait state
I (55295464) gsm-ppp: StatusCallBack: User Interrupt
D (55303464) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (55303494) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (55303494) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (55303494) cellular: mux-rx-line #3 (11/54): +CEREG: 1,4
D (55303494) cellular: mux-rx-line #3 (29/21): +CCLK: "25/03/05,10:52:11-20"
D (55303494) cellular: mux-rx-line #3 (11/6): +CSQ: 99,99
D (55303494) cellular: mux-rx-line #3 (2/0): OK
D (55304464) cellular: mux-tx #3: AT+CPSI?
D (55304474) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (55304484) cellular: mux-rx-line #3 (2/0): OK
D (55305464) cellular: mux-tx #3: AT+COPS?
D (55305474) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (55305474) cellular: mux-rx-line #3 (2/0): OK
D (55313464) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (55313484) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (55313484) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (55313484) cellular: mux-rx-line #3 (11/54): +CEREG: 1,4
D (55313484) cellular: mux-rx-line #3 (29/21): +CCLK: "25/03/05,10:52:21-20"
D (55313484) cellular: mux-rx-line #3 (11/6): +CSQ: 99,99
D (55313484) cellular: mux-rx-line #3 (2/0): OK
D (55314464) cellular: mux-tx #3: AT+CPSI?
D (55314474) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (55314474) cellular: mux-rx-line #3 (2/0): OK
D (55315464) cellular: mux-tx #3: AT+COPS?
D (55315474) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (55315474) cellular: mux-rx-line #3 (2/0): OK
D (55323464) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (55323484) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (55323494) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (55323494) cellular: mux-rx-line #3 (11/54): +CEREG: 1,4
D (55323494) cellular: mux-rx-line #3 (29/21): +CCLK: "25/03/05,10:52:31-20"
D (55323494) cellular: mux-rx-line #3 (11/6): +CSQ: 99,99
D (55323494) cellular: mux-rx-line #3 (2/0): OK
D (55324464) cellular: mux-tx #3: AT+CPSI?
D (55324474) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (55324474) cellular: mux-rx-line #3 (2/0): OK
D (55325464) cellular: mux-tx #3: AT+COPS?
D (55325474) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (55325474) cellular: mux-rx-line #3 (2/0): OK
D (55333464) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (55333484) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (55333484) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (55333484) cellular: mux-rx-line #3 (11/54): +CEREG: 1,4
D (55333484) cellular: mux-rx-line #3 (29/21): +CCLK: "25/03/05,10:52:41-20"
D (55333484) cellular: mux-rx-line #3 (11/6): +CSQ: 99,99
D (55333484) cellular: mux-rx-line #3 (2/0): OK
D (55334464) cellular: mux-tx #3: AT+CPSI?
D (55334474) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (55334474) cellular: mux-rx-line #3 (2/0): OK

.... loop continues....

[zorgms]

In the community www.smart-EMOTION.de reported some user the same issue since #1105 fixed.
Wifi connected and after 2-4h the Cellular starts looping PowerOffOn.

[dexterbg]

That's probably not a software issue. +CPSI: NO SERVICE,Online shouldn't normally happen, my Hologram SIM immediately starts from a cold boot with a GSM connection (+CPSI: GSM,Online,262-02,0x011f,18121,6 EGSM 900,-67,0,0-0) and switches to LTE within 30 seconds (+CPSI: LTE,Online,262-02,0xB092,13250579,154,EUTRAN-BAND1,100,5,5,-149,-1056,-709,8).

The signal level isn't too bad, which is puzzling. I wouldn't exclude an issue with the SIM card / provider. I assume you double checked the SIM's registration & account balance, so try a different SIM card. And try the Hologram SIM in another device, e.g. your mobile phone.

Another possible cause is some half broken/lose wire at the antenna connection. Try a different antenna, and check the internal antenna connection ("pigtail cable") running from the connector to the modem.

Regards,
Michael

[rbebeau]

So, I've done several things to try to troubleshoot as you requested. Sorry for the delay but I got a new SIM card from another provider to ensure that it is not the SIM card itself.

I did ensure that my previous provider (hologram) did have registration set up and my account balance was just fine.

I put the hologram SIM card into my phone, which worked fine. I put another provider's (verizon) SIM card into my phone, which also worked ok. I put the working Verizon SIM into OVMS and I am not able to register even after changing the APN setting to the correct one (APN: TRACFONE.VZWENTP).

I reconnected the pigtails inside and switched to a different cell antenna and no difference.

Using the hologram card it still connects one time on power on, but then a few seconds later the PPP session is dropped with NO CARRIER and no further connections are established.

If it is a hardware and not a software problem, that's fine, but I wanted to exhaust the software side and know I'm not doing anything wrong on my side of things before I request a replacement.

Thanks for any possible insight into my problem.

Here are the log entries I see with the new Verizon SIM:

D (719679) cellular: mux-rx-line #0 (2/12): OK
D (719679) cellular: mux-rx-line #0 (8/0): SMS DONE
D (729369) cellular: tx-cmd: AT+CPIN?;+CREG=1;+CGREG=1;+CEREG=1;+CTZU=1;+CTZR=1;+CLIP=1;+CMGF=1;+CNMI=1,2,0,0,0;+CSDH=1;+CMEE=2;+CSQ;+AUTOCSQ=1,1;E0;S0=0
D (729409) cellular: mux-rx-line #0 (124/37): AT+CPIN?;+CREG=1;+CGREG=1;+CEREG=1;+CTZU=1;+CTZR=1;+CLIP=1;+CMGF=1;+CNMI=1,2,0,0,0;+CSDH=1;+CMEE=2;+CSQ;+AUTOCSQ=1,1;E0;S0=0
D (729409) cellular: mux-rx-line #0 (12/21): +CPIN: READY
D (729409) cellular: mux-rx-line #0 (11/6): +CSQ: 21,99
D (729409) cellular: Signal Quality is: 21 (-71 dBm)
D (729409) cellular: mux-rx-line #0 (2/0): OK
D (731369) cellular: tx-cmd: AT+CGMR;+ICCID
D (731389) cellular: mux-rx-line #0 (22/38): +CGMR: LE20B05SIM7600G
D (731389) cellular: mux-rx-line #0 (28/6): +ICCID: XXXXXXXXXXXXXXX
D (731389) cellular: mux-rx-line #0 (2/0): OK
D (738319) cellular: mux-rx-line #0 (11/0): +CSQ: 17,99
D (738319) cellular: Signal Quality is: 17 (-79 dBm)
D (739369) cellular: tx-cmd: AT+CMUX=0;+CATR=6
D (739379) cellular: mux-rx-line #0 (2/0): OK
I (739379) cellular: State: Enter MuxStart state
I (739389) gsm-mux: Start MUX
I (739399) gsm-mux: Channel #0 is open
I (739409) gsm-mux: Channel #1 is open
I (739409) gsm-mux: Channel #2 is open
I (739419) gsm-mux: Channel #3 is open
I (739429) gsm-mux: Channel #4 is open
D (740369) cellular: State transition MuxStart => NetWait
I (740369) cellular: State: Enter NetWait state
I (740369) gsm-nmea: Startup
D (740369) cellular: mux-tx #1: AT+CGPS=0
D (742369) cellular: mux-tx #1: AT+CGPSNMEA=258
D (742389) cellular: mux-tx #1: AT+CGPSINFOCFG=5,258
D (742409) cellular: mux-tx #1: AT+CGPS=1,1
D (742409) cellular: mux-rx-line #1 (2/0): OK
D (742409) cellular: mux-rx-line #1 (2/0): OK
D (742409) cellular: mux-rx-line #1 (2/0): OK
D (742419) cellular: mux-rx-line #1 (2/0): OK
D (750369) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (750389) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
I (750399) cellular: Network Registration status: Searching
D (750399) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (750399) cellular: mux-rx-line #3 (11/54): +CEREG: 1,2
D (750399) cellular: mux-rx-line #3 (29/21): +CCLK: "80/01/05,20:12:31-16"
D (750399) cellular: mux-rx-line #3 (11/6): +CSQ: 17,99
D (750399) cellular: mux-rx-line #3 (2/0): OK
D (751369) cellular: mux-tx #3: AT+CPSI?
D (751379) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (751379) cellular: mux-rx-line #3 (2/0): OK
D (752369) cellular: mux-tx #3: AT+COPS?
D (752379) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (752379) cellular: mux-rx-line #3 (2/0): OK
D (760369) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (760389) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (760389) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (760389) cellular: mux-rx-line #3 (11/54): +CEREG: 1,2
D (760389) cellular: mux-rx-line #3 (29/21): +CCLK: "80/01/05,20:12:41-16"
D (760389) cellular: mux-rx-line #3 (11/6): +CSQ: 17,99
D (760389) cellular: mux-rx-line #3 (2/0): OK
D (761369) cellular: mux-tx #3: AT+CPSI?
D (761379) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (761379) cellular: mux-rx-line #3 (2/0): OK
D (762369) cellular: mux-tx #3: AT+COPS?
D (762379) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (762379) cellular: mux-rx-line #3 (2/0): OK
D (770369) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (770399) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (770399) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (770399) cellular: mux-rx-line #3 (11/54): +CEREG: 1,2
D (770399) cellular: mux-rx-line #3 (29/21): +CCLK: "80/01/05,20:12:51-16"
D (770399) cellular: mux-rx-line #3 (11/6): +CSQ: 17,99
D (770399) cellular: mux-rx-line #3 (2/0): OK
D (771369) cellular: mux-tx #3: AT+CPSI?
D (771379) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (771379) cellular: mux-rx-line #3 (2/0): OK
D (772369) cellular: mux-tx #3: AT+COPS?
D (772379) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (772379) cellular: mux-rx-line #3 (2/0): OK
D (780369) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (780389) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (780389) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (780399) cellular: mux-rx-line #3 (11/54): +CEREG: 1,2
D (780399) cellular: mux-rx-line #3 (29/21): +CCLK: "80/01/05,20:13:01-16"
D (780399) cellular: mux-rx-line #3 (11/6): +CSQ: 17,99
D (780399) cellular: mux-rx-line #3 (2/0): OK
D (781369) cellular: mux-tx #3: AT+CPSI?
D (781379) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (781379) cellular: mux-rx-line #3 (2/0): OK
D (782369) cellular: mux-tx #3: AT+COPS?
D (782379) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (782389) cellular: mux-rx-line #3 (2/0): OK
D (790369) cellular: mux-tx #3: AT+CREG?;+CGREG?;+CEREG?;+CCLK?;+CSQ
D (790389) cellular: mux-rx-line #3 (10/84): +CREG: 1,2
D (790389) cellular: mux-rx-line #3 (11/69): +CGREG: 1,2
D (790389) cellular: mux-rx-line #3 (11/54): +CEREG: 1,2
D (790389) cellular: mux-rx-line #3 (29/21): +CCLK: "80/01/05,20:13:11-16"
D (790389) cellular: mux-rx-line #3 (11/6): +CSQ: 17,99
D (790399) cellular: mux-rx-line #3 (2/0): OK
D (791369) cellular: mux-tx #3: AT+CPSI?
D (791379) cellular: mux-rx-line #3 (24/0): +CPSI: NO SERVICE,Online
D (791379) cellular: mux-rx-line #3 (2/0): OK
D (792369) cellular: mux-tx #3: AT+COPS?
D (792379) cellular: mux-rx-line #3 (8/6): +COPS: 0
D (792379) cellular: mux-rx-line #3 (2/0): OK

[dexterbg]

AFAICT your log says you've got a good cellular signal level (+CSQ), but none of the cellular providers offer to register you (+CREG,+CGREG,+CEREG,+CPSI). Even with a zero balance, I normally see the network registration happen.

What bugs me is your modem's reported revision code:

D (731389) cellular: mux-rx-line #0 (22/38): +CGMR: LE20B05SIM7600G

That doesn't match my two units, which show LE20B03SIM7600M21-A. Yours may be just a more recent firmware version, but let's compare the full modem info, just to be sure you haven't got a wrong SIMCOM7600 variant by accident:

OVMS# cell cmd ATI
Manufacturer: SIMCOM INCORPORATED
Model: SIMCOM_SIM7600G
Revision: SIM7600M21-A_V2.0
IMEI: 8688xxxxxxxxxxxx
+GCAP: +CGSM
OK

OVMS# cell cmd ATI
Manufacturer: SIMCOM INCORPORATED
Model: SIMCOM_SIM7600G
Revision: SIM7600M21-A_V2.0.1
SVN: 01
IMEI: 8688xxxxxxxxxxxx
+GCAP: +CGSM
OK

The only page I can find on the web mentioning your revision code is another OVMS user's metrics dump, and that also doesn't show a cellular network…

[dexterbg]

Can you also please query the preferred mode & band selection?

OVMS# cell cmd AT+CNMP?
+CNMP: 2
OK

OVMS# cell cmd AT+CNBP?
+CNBP: 0x100200000EE80380,0x480000000000000000000000000000000000000000000042000007FFFFDF3FFF,0x000000000000003F
OK

[rbebeau]

Thanks for the speedy followup.

Here are the results of the commands...

OVMS# cell cmd ATI
Manufacturer: SIMCOM INCORPORATED
Model: SIMCOM_SIM7600G
Revision: SIM7600G_V2.0.2
IMEI: 8688XXXXXXXXXXX
+GCAP: +CGSM
OK

OVMS# cell cmd AT+CNMP?
+CNMP: 2
OK

OVMS# cell cmd AT+CNBP?
+CNBP: 0x100200000EE80380,0x480000000000000000000000000000000000000000000042000007FFFFDF3FFF,0x000000000000003F
OK

[dexterbg]

That's the correct modem version (7600G = global edition, supports all frequency bands) and mode & band selections are correct as well (auto = allow all).

You've got a more recent firmware, but I've meanwhile found other users running that version without any issues. I've run out of ideas for now, except some internal HW issue of your modem/module.