Can't connect to cellular

technodabbler · October 18, 2025, 5:19am

Hi,

I’m having problems connecting my Particle Tachyon to cellular network. I live in Canada. If I run the particle-cell-scan command:

[INFO] 1) Stopping systemd service: particle-tachyon-rild

[OK]   Service stopped

[INFO] 2) Creating PTY pair (null-modem) with socat

[OK]   virtA ready: /tmp/virtA

[INFO]   socat log (so far):

2025/10/18 01:16:05 socat[29267] N PTY is /dev/pts/2

[INFO] 3) Starting particle-tachyon-rild on /tmp/virtA

[OK]   rild started (PID 29271)

[OK]   virtB ready: /tmp/virtB

[INFO] 4) AT -> expect OK

[INFO] 5) AT+COPS? -> expect line starting '+COPS: 0'

[INFO] 6) AT+COPS=? -> wait for OK/ERROR and capture network scan

[OK] AT -> OK

[OK] AT+COPS? -> +COPS: 0

[INFO] AT+COPS=? finalized with OK

Network Scan: +COPS: (1,"Rogers Wireless","ROGERS","302720",12),(1,"Rogers Wireless","ROGERS","302720",7),(1,"Videotron","CANVT","302520",7),(1,"TELUS","TELUS","302220",12),(1,"Videotron","CANVT","302500",7),(1,"TELUS","TELUS","302220",7),(1,"Bell","Bell","302610",7),(1,"Bell","Bell","302610",12),,(0,1,2,3,4),(0,1,2)

[INFO] 7) Starting systemd service: particle-tachyon-rild

[OK]   Service started

[OK]   All requested steps completed.

This should be good news as Telus is one of the supported network. However, if I run journalctl -u particle-tachyon-rild --no-pager , I see the following toward the end

Oct 18 01:17:45 tachyon-9b7dc3eb particle-tachyon-rild[29545]: Command: AT+CEREG?, Response:

Oct 18 01:17:45 tachyon-9b7dc3eb particle-tachyon-rild[29545]: +CEREG: 2,3

Oct 18 01:17:45 tachyon-9b7dc3eb particle-tachyon-rild[29545]: 

Oct 18 01:17:45 tachyon-9b7dc3eb particle-tachyon-rild[29545]: OK

Oct 18 01:17:50 tachyon-9b7dc3eb particle-tachyon-rild[29545]: Command: AT+CEREG?, Response:

Oct 18 01:17:50 tachyon-9b7dc3eb particle-tachyon-rild[29545]: +CEREG: 2,3

Oct 18 01:17:50 tachyon-9b7dc3eb particle-tachyon-rild[29545]: 

Oct 18 01:17:50 tachyon-9b7dc3eb particle-tachyon-rild[29545]: OK

And my understanding is that +CEREG: 2,3 means denied by network. What should I do?

laupow · October 20, 2025, 4:21pm

Hi @technodabbler

Thanks for providing the logs – that’s super helpful. It looks like you’re device should be connecting, so we’ll investigate why that isn’t happening. Hang tight!

technodabbler · October 20, 2025, 4:53pm

Hi,

Does it help if I keep the device on? I’m not sure how much remote checking you can do.

Alex

laupow · October 23, 2025, 11:37am

Hi @technodabbler could you reboot your device and see if connects to cellular?

technodabbler · October 26, 2025, 4:48pm

No luck, here are the debug commands

particle-cell-scan

[INFO] 1) Stopping systemd service: particle-tachyon-rild

[OK]   Service stopped

[INFO] 2) Creating PTY pair (null-modem) with socat

[OK]   virtA ready: /tmp/virtA

[INFO]   socat log (so far):

2025/10/26 12:43:30 socat[6655] N PTY is /dev/pts/1

[INFO] 3) Starting particle-tachyon-rild on /tmp/virtA

[OK]   rild started (PID 6658)

[OK]   virtB ready: /tmp/virtB

[INFO] 4) AT -> expect OK

[INFO] 5) AT+COPS? -> expect line starting '+COPS: 0'

[INFO] 6) AT+COPS=? -> wait for OK/ERROR and capture network scan

[OK] AT -> OK

[OK] AT+COPS? -> +COPS: 0

[INFO] AT+COPS=? finalized with OK

Network Scan: +COPS: (1,"TELUS","TELUS","302220",12),(1,"Bell","Bell","302610",7),(1,"Rogers Wireless","ROGERS","302720",12),(1,"Bell","Bell","302610",12),(1,"Videotron","CANVT","302500",7),(1,"Videotron","CANVT","302520",7),(1,"Rogers Wireless","ROGERS","302720",7),(1,"TELUS","TELUS","302220",7),,(0,1,2,3,4),(0,1,2)

[INFO] 7) Starting systemd service: particle-tachyon-rild

[OK]   Service started

[OK]   All requested steps completed.

journalctl -u particle-tachyon-rild --no-pager

-- Reboot --

Oct 26 12:40:54 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Error: Network Registration timed out after 5 minutes!

Oct 26 12:40:54 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Please check antenna and APN setting!

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Processing: STATUS

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Signal Strength: 0 (0-31) / -113dBm, RSRP: 0dBm, RSRQ: 0dB, RSSNR: 0.0dB

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: MCCMNC: unknown, LAC: 0, CID: 0, ACT: unknown, CARRIER: unknown

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: data_connection: down

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Registration State: Not Registered, Not Searching, Registration Denied Reason: 0, PCI: 415, ECI: 60464701

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: State command received

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: ModemVitals command received

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Processing: CONNECT

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Registering to Cellular Network...

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: ICCID currently active: 8943052003919015606 (KDDI SIM)

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Active SIM: 1 (INTERNAL)

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Using APN: "kddi.m2m.drei.at"

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+QNVR=5280,0, Response:

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: +QNVR: "0102000000000000"

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: 

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: ATE0, Response:

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+QNVFR="/nv/item_files/ims/IMS_enable", Response: +QNVFR:

Oct 26 12:40:55 tachyon-9b7dc3eb particle-tachyon-rild[3394]: 00

Oct 26 12:40:56 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+QNVFR="/nv/item_files/modem/mmode/sms_only", Response: Command: AT+QNVFR="/nv/item_files/modem/mmode/sms_only", Response:

Oct 26 12:40:56 tachyon-9b7dc3eb particle-tachyon-rild[3394]: ERROR

Oct 26 12:40:56 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+QNVFR="/nv/item_files/modem/mmode/ue_usage_setting", Response: +QNVFR:

Oct 26 12:40:56 tachyon-9b7dc3eb particle-tachyon-rild[3394]: 01

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: ATE1, Response:

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Get Preferred network type: 24 (NR5G TD-SCDMA LTE CDMA EVDO GSM WCDMA)

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+CGDCONT?, Response:

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: +CGDCONT: 1,"IP","kddi.m2m.drei.at","0.0.0.0",0,0,0,0,,,,,,,,,"",,,,0

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: 

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+CEREG=2, Response:

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+COPS?, Response:

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: +COPS: 0

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: 

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+CEREG?, Response:

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: +CEREG: 2,2

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: 

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: State command received

Oct 26 12:40:57 tachyon-9b7dc3eb particle-tachyon-rild[3394]: ModemVitals command received

Oct 26 12:41:02 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+CEREG?, Response:

Oct 26 12:41:02 tachyon-9b7dc3eb particle-tachyon-rild[3394]: +CEREG: 2,2

Oct 26 12:41:02 tachyon-9b7dc3eb particle-tachyon-rild[3394]: 

Oct 26 12:41:02 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:41:07 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+CEREG?, Response:

Oct 26 12:41:07 tachyon-9b7dc3eb particle-tachyon-rild[3394]: +CEREG: 2,2

Oct 26 12:41:07 tachyon-9b7dc3eb particle-tachyon-rild[3394]: 

Oct 26 12:41:07 tachyon-9b7dc3eb particle-tachyon-rild[3394]: OK

Oct 26 12:41:12 tachyon-9b7dc3eb particle-tachyon-rild[3394]: Command: AT+CEREG?, Response:

Oct 26 12:41:12 tachyon-9b7dc3eb particle-tachyon-rild[3394]: +CEREG: 2,2

technodabbler · October 26, 2025, 7:08pm

Leaving it on for 2 hours, it seems to have connected

Cellular

Carrier:Bell

RSRP:-99 dBm

Active ICCID: xyz

Registration state:Registered, Roaming

Access technology:NR5G (5G)

Is it possible that it takes an hour to find cell connections when I turn on the board?

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Can't connect to cellular

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