EC25E Modem not able to scan 2G and 3G cell id (towers network)

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1

EC25E Modem not able to scan 2G and 3G cell id (towers network)
Modem info about model is : EC25EFA-512-SKY.
I need work on 2g and 3g towers so we need select those towers.
Where I testing it’s confirmed at least 6 2G towers and 2 3g towers at that spot where we Scanning.

Current buy modem with default firmware is EC25EFAR06A11M4G in that firmware not Able to scan 2g 3g data,
I try to upgrade EC25EFAR06A21M4G_20.200.20.200
and EC25EFAR06A21M4G_20.300.20.300 both try problem is same.
I also try different antenna but not working working.
I also try same antenna which works previously modems after tht is same problem.
please provide solution urgent basic.

Below is result AT Commands results
[2026-01-16 15:21:05:777_R:] OK
[2026-01-16 15:21:05:784_S:] ATI
[2026-01-16 15:21:05:787_R:] ATI

[2026-01-16 15:21:05:965_R:] Quectel
[2026-01-16 15:21:05:965_R:] EC25
[2026-01-16 15:21:05:965_R:] Revision: EC25EFAR06A11M4G

[2026-01-16 15:21:05:965_R:] OK

/* Use AT+CPIN? to query the SIM card status : SIM card inserted or not, locked or unlocked */
[2026-01-16 15:21:05:985_S:] AT+CPIN?
[2026-01-16 15:21:06:003_R:] AT+CPIN?

[2026-01-16 15:21:06:015_R:] +CME ERROR: SIM not inserted

/* Make sure SIM card is unlocked */
[2026-01-16 15:21:22:340_S:] AT+CREG?
[2026-01-16 15:21:22:349_R:] AT+CREG?

[2026-01-16 15:21:22:357_R:] +CREG: 0,2

[2026-01-16 15:21:22:357_R:] OK
[2026-01-16 15:21:39:836_S:] AT+CSQ
[2026-01-16 15:21:39:845_R:] AT+CSQ

[2026-01-16 15:21:39:854_R:] +CSQ: 22,99

[2026-01-16 15:21:39:854_R:] OK
[2026-01-16 15:21:58:606_S:] AT+QCOPS=7,1
[2026-01-16 15:21:58:615_R:] AT+QCOPS=7,1

[2026-01-16 15:22:38:488_R:] +QCOPS: “4G”,“IND airtel”,“40410”,“LTE BAND 1”,315,936,1C7,-57,-83,-7
[2026-01-16 15:22:38:488_R:] +QCOPS: “4G”,“IND airtel”,“40410”,“LTE BAND 3”,1346,936,1E7,-68,-97,-14
[2026-01-16 15:22:38:488_R:] +QCOPS: “4G”,“IND-JIO”,“405872”,“LTE BAND 5”,2525,2c,128,-67,-99,-14

[2026-01-16 15:22:38:488_R:] OK
[2026-01-16 15:22:50:675_S:] AT+QCOPS=7,1
[2026-01-16 15:22:50:684_R:] AT+QCOPS=7,1

[2026-01-16 15:23:27:909_R:] +QCOPS: “4G”,“IND airtel”,“40410”,“LTE BAND 1”,315,936,1C7,-57,-83,-7
[2026-01-16 15:23:27:909_R:] +QCOPS: “4G”,“IND airtel”,“40410”,“LTE BAND 3”,1346,936,1E7,-76,-98,-8
[2026-01-16 15:23:27:909_R:] +QCOPS: “4G”,“IND-JIO”,“405872”,“LTE BAND 5”,2525,2c,124,-68,-101,-15

[2026-01-16 15:23:27:909_R:] OK

2

Dear @Vinod_Malik ,

Thank you for sharing the logs and firmware versions.

Based on the AT output you provided, the root cause is clear: the SIM is not detected (AT+CPIN? returns +CME ERROR: SIM not inserted). With SIM absent, the module cannot complete normal 2G/3G registration/selection procedures, and your current scan output (AT+QCOPS=7,1) is simply reporting LTE cells it can see over the air. This is why you only get “4G” results even though you believe 2G/3G sites exist at the location. Upgrading firmware will not fix this.

Instead, kindly follow the following steps.

  1. Fix SIM detection first (mandatory)
    Re-seat the SIM and confirm the SIM socket/wiring on your hardware (SIM_VDD / SIM_CLK / SIM_DATA / SIM_RST, and SIM_DET if used).
    Then confirm the SIM is readable by running:
  • AT+CPIN? → must return +CPIN: READY
  • AT+QCCID → must return ICCID
  • AT+CIMI → must return IMSI
    If AT+CPIN? still shows “SIM not inserted”, this is a hardware/SIM interface issue (socket, routing, SIM_DET logic, or contact), not a network/firmware issue.
  1. After SIM is READY, force 2G/3G scanning (for your use case)
    Once the SIM is detected, configure the modem to scan 2G/3G and reboot:
  • AT+QCFG=“nwscanmode”,2,1
  • AT+CFUN=1,1
    Then scan operators:
  • AT+COPS=?
    At this point, if 2G/3G coverage exists and the module supports the local GSM/WCDMA bands, you will see 2G/3G entries.
  1. If 2G/3G still do not appear, it will be a band/variant limitation
    The final determining factor is whether your specific variant EC25EFA-512-SKY supports the 2G/3G bands used at your site. To confirm, please share (after SIM is READY)
  • AT+QCFG=“band”
  • AT+QCFG=“nwscanmode”
  • AT+QNWINFO

Right now, your setup is not in a valid state to select 2G/3G towers because the SIM is not inserted/detected. Please resolve SIM detection first; only then 2G/3G scanning and tower selection can work.

Kindly reach out to me again if you have further queries, I will be happy to assist you further.

Best Regards,
Aghelan

3

I try as you guide with sim also this is result below

/* Use ATI to get module information of Manufacturer ID, Device module and Firmware version */
[2026-01-20 14:56:45:615_S:] ATI
[2026-01-20 14:56:45:623_R:] ATI

[2026-01-20 14:56:45:631_R:] Quectel
[2026-01-20 14:56:45:631_R:] EC25
[2026-01-20 14:56:45:631_R:] Revision: EC25EFAR08A01M4G

[2026-01-20 14:56:45:631_R:] OK

/* Use AT+GSN to query the IMEI of module */
[2026-01-20 14:56:45:650_S:] AT+GSN
[2026-01-20 14:56:45:659_R:] AT+GSN

[2026-01-20 14:56:45:669_R:] 860548047705188

[2026-01-20 14:56:45:669_R:] OK
[2026-01-20 14:56:45:675_S:] ATI
[2026-01-20 14:56:45:678_R:] ATI

[2026-01-20 14:56:45:686_R:] Quectel
[2026-01-20 14:56:45:686_R:] EC25
[2026-01-20 14:56:45:686_R:] Revision: EC25EFAR08A01M4G

[2026-01-20 14:56:45:686_R:] OK
[2026-01-20 14:56:45:696_S:] AT+QURCCFG=“URCPORT”,“usbat”
[2026-01-20 14:56:45:706_R:] AT+QURCCFG=“URCPORT”,“usbat”

[2026-01-20 14:56:45:714_R:] OK

/* Use AT+CPIN? to query the SIM card status : SIM card inserted or not, locked or unlocked */
[2026-01-20 14:56:45:740_S:] AT+CPIN?
[2026-01-20 14:56:45:751_R:] AT+CPIN?

[2026-01-20 14:56:45:760_R:] +CPIN: READY

[2026-01-20 14:56:45:760_R:] OK

/* Use AT+CIMI to query the IMSI of SIM card */
[2026-01-20 14:56:45:778_S:] AT+CIMI
[2026-01-20 14:56:45:785_R:] AT+CIMI

[2026-01-20 14:56:45:794_R:] 404100527389755

[2026-01-20 14:56:45:794_R:] OK

/* Use AT+QCCID to query ICCID number of SIM card */
[2026-01-20 14:56:45:813_S:] AT+QCCID
[2026-01-20 14:56:45:824_R:] AT+QCCID

[2026-01-20 14:56:45:835_R:] +QCCID: 8991102005273897551F

[2026-01-20 14:56:45:835_R:] OK

/* Use AT+CSQ to query current signal quality */
[2026-01-20 14:56:45:855_S:] AT+CSQ
[2026-01-20 14:56:45:865_R:] AT+CSQ

[2026-01-20 14:56:45:874_R:] +CSQ: 29,99

[2026-01-20 14:56:45:874_R:] OK

/* Use AT+CREG? /AT+CGREG? to query the network registration status. */
[2026-01-20 14:56:45:890_S:] AT+CREG?
[2026-01-20 14:56:45:900_R:] AT+CREG?

[2026-01-20 14:56:45:909_R:] +CREG: 0,1

[2026-01-20 14:56:45:909_R:] OK
[2026-01-20 14:56:45:919_S:] AT+CGREG?
[2026-01-20 14:56:45:928_R:] AT+CGREG?

[2026-01-20 14:56:45:937_R:] +CGREG: 0,1

[2026-01-20 14:56:45:937_R:] OK

/* Use AT+COPS? to query current Network Operator */
[2026-01-20 14:56:45:953_S:] AT+COPS?
[2026-01-20 14:56:45:963_R:] AT+COPS?

[2026-01-20 14:56:45:973_R:] +COPS: 0,0,“airtel airtel”,7

[2026-01-20 14:56:45:973_R:] OK

/Use AT+CEREG? to query current EPS Network Registration Status/
[2026-01-20 14:56:45:994_S:] AT+CEREG?
[2026-01-20 14:56:46:003_R:] AT+CEREG?

[2026-01-20 14:56:46:013_R:] +CEREG: 0,1

[2026-01-20 14:56:46:013_R:] OK
[2026-01-20 14:56:55:325_S:] AT+CPIN?
[2026-01-20 14:56:55:335_R:] AT+CPIN?

[2026-01-20 14:56:55:344_R:] +CPIN: READY

[2026-01-20 14:56:55:344_R:] OK
[2026-01-20 14:57:09:460_S:] AT+QCCID
[2026-01-20 14:57:09:468_R:] AT+QCCID

[2026-01-20 14:57:09:478_R:] +QCCID: 8991102005273897551F

[2026-01-20 14:57:09:478_R:] OK
[2026-01-20 14:57:29:028_S:] AT+CIMI
[2026-01-20 14:57:29:036_R:] AT+CIMI

[2026-01-20 14:57:29:044_R:] 404100527389755

[2026-01-20 14:57:29:044_R:] OK
[2026-01-20 14:58:12:524_S:] AT+QCFG=“nwscanmode”,2,1
[2026-01-20 14:58:12:533_R:] AT+QCFG=“nwscanmode”,2,1

[2026-01-20 14:58:12:541_R:] ERROR
[2026-01-20 14:58:21:608_S:] AT+QCFG=“nwscanmode”,2,1
[2026-01-20 14:58:21:615_R:] AT+QCFG=“nwscanmode”,2,1

[2026-01-20 14:58:21:627_R:] ERROR
[2026-01-20 14:58:48:556_S:] AT+CFUN=1,1
[2026-01-20 14:58:48:564_R:] AT+CFUN=1,1

[2026-01-20 14:58:48:573_R:] OK
[2026-01-20 15:00:07:044_S:] AT+COPS=?
[2026-01-20 15:00:07:052_R:] AT+COPS=?

[2026-01-20 15:00:21:268_R:] +COPS: (2,“airtel”,“airtel”,“40410”,7),(1,“IND-JIO”,“JIO”,“405872”,7),(1,“IN-DOLPHIN”,“DOLPHIN”,“40468”,2),(0-4),(0-2)

[2026-01-20 15:00:21:268_R:] OK
[2026-01-20 15:00:40:248_S:] AT+QCFG=“band”
[2026-01-20 15:00:40:256_R:] AT+QCFG=“band”

[2026-01-20 15:00:40:265_R:] ERROR
[2026-01-20 15:00:53:554_S:] AT+QCFG=“nwscanmode”
[2026-01-20 15:00:53:562_R:] AT+QCFG=“nwscanmode”

[2026-01-20 15:00:53:571_R:] ERROR
[2026-01-20 15:01:05:342_S:] AT+QNWINFO
[2026-01-20 15:01:05:351_R:] AT+QNWINFO

[2026-01-20 15:01:05:359_R:] +QNWINFO: “FDD LTE”,“40410”,“LTE BAND 1”,315

[2026-01-20 15:01:05:359_R:] OK

Please help

4

Dear @Vinod_Malik ,

Thank you for the updated logs.

Your module and SIM are working normally (SIM is READY, signal is good, and the module is registered). The reason you cannot set/query nwscanmode and band is not firmware-related — in your log, the commands are being sent with smart quotation marks (“ ”) instead of standard ASCII quotes (" "). The modem does not recognize smart quotes, so it returns ERROR.

Please re-run the following commands using standard quotes exactly as shown below (you may type them manually to avoid auto-formatting):

  1. Query current scan mode
    AT+QCFG=“nwscanmode”

  2. Query band configuration
    AT+QCFG=“band”

  3. Force 2G only (GSM) and reboot
    AT+QCFG=“nwscanmode”,1,1
    AT+CFUN=1,1

  4. After reboot, confirm the current network
    AT+QNWINFO

  5. Get 2G serving cell information (Cell ID / LAC / ARFCN) after the module camps on GSM
    AT+QENG=“servingcell”

Kindly note that your AT+COPS=? result already shows a GSM/2G network entry (…,“IN-DOLPHIN”,… ,2 where 2 = GSM), which indicates 2G is available at your test location. After the commands above are executed with standard quotes, you should be able to switch to GSM and retrieve the 2G cell details.

Please share the outputs of the following after performing the steps:

  1. AT+QCFG=“nwscanmode”
  2. AT+QNWINFO
  3. AT+QENG=“servingcell”

Best Regards,
Aghelan

5

/* Use AT+QCCID to query ICCID number of SIM card */
[2026-01-22 14:35:23:705_S:] AT+QCCID
[2026-01-22 14:35:23:715_R:] AT+QCCID

[2026-01-22 14:35:23:725_R:] +QCCID: 8991000906183597210F

[2026-01-22 14:35:23:725_R:] OK

/* Use AT+CSQ to query current signal quality */
[2026-01-22 14:35:23:745_S:] AT+CSQ
[2026-01-22 14:35:23:753_R:] AT+CSQ

[2026-01-22 14:35:23:762_R:] +CSQ: 31,99

[2026-01-22 14:35:23:762_R:] OK

/* Use AT+CREG? /AT+CGREG? to query the network registration status. */
[2026-01-22 14:35:23:777_S:] AT+CREG?
[2026-01-22 14:35:23:786_R:] AT+CREG?

[2026-01-22 14:35:23:796_R:] +CREG: 0,1

[2026-01-22 14:35:23:796_R:] OK
[2026-01-22 14:35:23:820_S:] AT+CGREG?
[2026-01-22 14:35:23:830_R:] AT+CGREG?

[2026-01-22 14:35:23:855_R:] +CGREG: 0,1

[2026-01-22 14:35:23:855_R:] OK

/* Use AT+COPS? to query current Network Operator */
[2026-01-22 14:35:23:885_S:] AT+COPS?
[2026-01-22 14:35:23:895_R:] AT+COPS?

[2026-01-22 14:35:23:908_R:] +COPS: 0,0,“airtel airtel”,7

[2026-01-22 14:35:23:908_R:] OK
[2026-01-22 14:36:25:134_R:] AT+QCFG=“nwscanmode”

[2026-01-22 14:36:25:142_R:] +QCFG: “nwscanmode”,0

[2026-01-22 14:36:25:142_R:] OK
[2026-01-22 14:36:45:808_S:] AT+QCFG=“band”
[2026-01-22 14:36:45:816_R:] AT+QCFG=“band”

[2026-01-22 14:36:45:824_R:] +QCFG: “band”,0x10,0x55,0x0

[2026-01-22 14:36:45:824_R:] OK
[2026-01-22 14:37:14:156_R:] AT+QCFG=“nwscanmode”,1,1

[2026-01-22 14:37:14:164_R:] +CME ERROR: operation not allowed
[2026-01-22 14:37:27:383_S:] AT+CFUN=1,1
[2026-01-22 14:37:27:392_R:] AT+CFUN=1,1

[2026-01-22 14:37:27:399_R:] OK
[2026-01-22 14:38:20:883_S:] AT+QNWINFO
[2026-01-22 14:38:20:891_R:] AT+QNWINFO

[2026-01-22 14:38:20:900_R:] +QNWINFO: “FDD LTE”,“40410”,“LTE BAND 1”,315

[2026-01-22 14:38:20:900_R:] OK
[2026-01-22 14:38:59:561_S:] AT+QENG=“servingcell”
[2026-01-22 14:38:59:570_R:] AT+QENG=“servingcell”

[2026-01-22 14:38:59:580_R:] +QENG: “servingcell”,“NOCONN”,“LTE”,“FDD”,404,10,9C8F835,455,315,1,4,4,936,-78,-6,-52,24,43

[2026-01-22 14:38:59:580_R:] OK

6

Dear @Vinod_Malik ,

Thank you for sharing the latest logs.

Based on the outputs provided, the module is operating normally and is currently registered on LTE:

  1. SIM is detected successfully (AT+QCCID OK)

  2. Signal quality is excellent (AT+CSQ: 31,99)

  3. Network registration is successful (AT+CREG/AT+CGREG: 0,1)

  4. Current RAT is LTE Band 1 (AT+QNWINFO: “FDD LTE” … “LTE BAND 1”)

  5. Serving cell information is reported correctly in LTE (AT+QENG=“servingcell”)

Regarding your request to scan/lock 2G/3G:

  • Your attempt to change the scan mode using AT+QCFG=“nwscanmode”,1,1 returns +CME ERROR: operation not allowed. This indicates that, on your current firmware/configuration, the module does not permit changing the RAT scan mode via AT+QCFG=“nwscanmode”, so it will remain on LTE.

To proceed with 2G/3G scanning, please use manual operator selection and then verify whether the network/SIM allows camping on 2G/3G:

  1. Scan available operators:
  • AT+COPS=?
    From the scan result, identify the operator that corresponds to 2G (GSM) or 3G (UTRAN) and note its PLMN (MCCMNC).
  1. Deregister and manually select that PLMN:
  • AT+COPS=2
  • AT+COPS=1,2,“”
  1. After 60–120 seconds, please share the following outputs:
  • AT+COPS?
  • AT+QNWINFO
  • AT+QENG=“servingcell”
  • AT+CEER

If the manual selection cannot camp on 2G/3G and the module remains on LTE, this typically indicates operator/SIM restrictions (2G/3G access not enabled) or limited/retired 3G coverage in that area. The AT+CEER output will help confirm the exact reject cause.

Best Regards,
Aghelan

7

/* Use AT+CSQ to query current signal quality */
[2026-01-23 11:12:29:477_S:] AT+CSQ
[2026-01-23 11:12:29:493_R:] AT+CSQ

[2026-01-23 11:12:29:503_R:] +CSQ: 31,99

[2026-01-23 11:12:29:503_R:] OK

/* Use AT+CREG? /AT+CGREG? to query the network registration status. */
[2026-01-23 11:12:29:530_S:] AT+CREG?
[2026-01-23 11:12:29:545_R:] AT+CREG?

[2026-01-23 11:12:29:561_R:] +CREG: 0,1

[2026-01-23 11:12:29:561_R:] OK
[2026-01-23 11:12:29:578_S:] AT+CGREG?
[2026-01-23 11:12:29:595_R:] AT+CGREG?

[2026-01-23 11:12:29:609_R:] +CGREG: 0,1

[2026-01-23 11:12:29:609_R:] OK

/* Use AT+COPS? to query current Network Operator */
[2026-01-23 11:12:29:634_S:] AT+COPS?
[2026-01-23 11:12:29:647_R:] AT+COPS?

[2026-01-23 11:12:29:661_R:] +COPS: 0,0,“airtel airtel”,7

[2026-01-23 11:12:29:661_R:] OK
[2026-01-23 11:13:01:432_S:] AT+COPS=?
[2026-01-23 11:13:01:441_R:] AT+COPS=?

[2026-01-23 11:13:18:179_R:] +COPS: (2,“airtel”,“airtel”,“40410”,7),(1,“IND-JIO”,“JIO”,“405872”,7),(3,“Vi India”,“Vi India”,“40411”,7),(0-4),(0-2)

[2026-01-23 11:13:18:179_R:] OK
[2026-01-23 11:14:36:094_S:] AT+COPS=2
[2026-01-23 11:14:36:103_R:] AT+COPS=2

[2026-01-23 11:14:36:124_R:] OK
[2026-01-23 11:15:09:923_S:] AT+COPS=1,2,“40410”
[2026-01-23 11:15:09:938_R:] AT+COPS=1,2,“40410”

[2026-01-23 11:15:10:766_R:] OK
[2026-01-23 11:18:21:890_S:] AT+COPS?
[2026-01-23 11:18:21:898_R:] AT+COPS?

[2026-01-23 11:18:21:906_R:] +COPS: 1,2,“40410”,7

[2026-01-23 11:18:21:906_R:] OK
[2026-01-23 11:18:37:406_S:] AT+QNWINFO
[2026-01-23 11:18:37:415_R:] AT+QNWINFO

[2026-01-23 11:18:37:423_R:] +QNWINFO: “FDD LTE”,“40410”,“LTE BAND 1”,315

[2026-01-23 11:18:37:423_R:] OK

[2026-01-23 11:19:07:539_S:] AT+QENG=“servingcell”
[2026-01-23 11:19:07:547_R:] AT+QENG=“servingcell”

[2026-01-23 11:19:07:556_R:] +QENG: “servingcell”,“NOCONN”,“LTE”,“FDD”,404,10,9C8F835,455,315,1,4,4,936,-78,-8,-50,13,42

[2026-01-23 11:19:07:556_R:] OK
[2026-01-23 11:19:21:486_S:] AT+CEER
[2026-01-23 11:19:21:495_R:] AT+CEER

[2026-01-23 11:19:21:504_R:] +CEER: 6,258

[2026-01-23 11:19:21:504_R:] OK

8

Dear @Vinod_Malik ,

Thank you for running the additional tests and sharing the complete logs.

Your module is working normally, and the SIM/network registration is successful. Signal strength is very good (CSQ 31), and the module is registered (CREG/CGREG 0,1). However, all results clearly show that the module is only able to camp on LTE in your current test environment.

  1. Operator scan result confirms LTE-only visibility
    In your AT+COPS=? output, every operator entry is reported with access technology “7”. On EC25, “7” corresponds to LTE/E-UTRAN. There are no entries reported as GSM/2G or UMTS/3G in the scan result, even though you expected 2G/3G sites at that location.

  2. Manual operator selection also remains on LTE
    You deregistered (AT+COPS=2) and then manually selected Airtel PLMN 40410 (AT+COPS=1,2,“40410”). The module stayed on access technology “7”, and AT+QNWINFO and AT+QENG=“servingcell” both confirm the serving system is LTE (LTE Band 1). This confirms the modem is not able to camp on 2G/3G under the current SIM/operator/location conditions.

  3. CEER indicates a network-side restriction/condition
    The AT+CEER result (+CEER: 6,258) indicates the last registration attempt ended with a network-side reject/condition rather than a local RF/antenna issue. In practice, this aligns with the scan results above: 2G/3G camping is not available/allowed in the current setup.

With the SIM and network conditions used in your test, 2G/3G camping is not possible, so the module cannot provide 2G/3G cell ID/tower information. This is not caused by antenna or the firmware versions you tried, and it is not something that can be forced by AT commands if the network/SIM does not provide or permit 2G/3G service.

Next actions to proceed with 2G/3G tower selection

  1. Please test with a SIM that is confirmed by the operator to have 2G/3G service enabled (some SIM profiles, especially M2M/IoT plans, are provisioned as LTE-only).
  2. Please test at a location where 2G/3G service is confirmed active for that same SIM/operator.
  3. If your operator can confirm 2G/3G is available, please share the operator confirmation and we can advise the exact test steps to capture the 2G/3G cell information once the module is able to camp on GSM/UMTS.

Best Regards,
Aghelan

9

Hi Aghelan

I have scanning by other Modem which full name is EC25EFA-512-STD and loge is below :

[2026-01-28 11:25:04:047_S:] ATI
[2026-01-28 11:25:04:048_R:] ATI
[2026-01-28 11:25:04:051_R:] Quectel
[2026-01-28 11:25:04:051_R:] EC25
[2026-01-28 11:25:04:051_R:] Revision: EC25EFAR06A21M4G

[2026-01-28 11:25:04:051_R:] OK

[2026-01-28 11:31:19:437_S:] AT+QCOPS=3,1
[2026-01-28 11:31:19:448_R:] AT+QCOPS=3,1
[2026-01-28 11:34:11:059_R:] +QCOPS: “2G”,“Vi India”,“40411”,“GSM 1800”,645,408,1740,49,-86,17,1
[2026-01-28 11:34:11:059_R:] +QCOPS: “2G”,“IND airtel”,“40410”,“GSM 900”,76,67,DB36,24,-86,17,1
[2026-01-28 11:34:11:059_R:] +QCOPS: “2G”,“Vi India”,“40411”,“GSM 1800”,599,408,8B13,23,-87,19,1
[2026-01-28 11:34:11:059_R:] +QCOPS: “2G”,“IND airtel”,“40410”,“GSM 900”,79,67,B7EE,19,-87,19,1
[2026-01-28 11:34:11:059_R:] +QCOPS: “2G”,“IND airtel”,“40410”,“GSM 900”,76,67,DB36,24,-87,19,1
[2026-01-28 11:34:11:059_R:] +QCOPS: “3G”,“”,“40468”,“WCDMA 2100”,10782,452,66E69,80,-106,-16

[2026-01-28 11:34:11:059_R:] OK

The modem which is working on location 2g and 3g available is “EC25EFA-512-STS” as I shared above. The modem which is not working on the same location only giving 3G,4g not giving 2g Scan is “EC25EFA-512-SKT”. There is a difference in name in the last 3 alphabets STD and SKT. It may be an issue or not I do not know but I think mentioning it so may be helpful.

10

Dear @Vinod_Malik ,

Thank you for the comparison log, this is enough to conclude the root cause.

Since the EC25EFA-512-STD module at the same location can scan and report 2G (GSM 900/1800) and 3G (WCDMA 2100) cells, we can confirm that 2G/3G coverage exists and your antenna/environment are not the issue.

The difference is the module variant. EC25EFA-512-SKT is a customized/operator variant (that is fairly used in South Korea) and based on your results (no 2G shown in scans and the module remaining on LTE), it is not configured to support 2G scanning/selection in your scenario. This is not something that can be solved by upgrading firmware or by AT settings, because the limitation is tied to the variant configuration/capability.

For your requirement to select/scan 2G and 3G towers, the correct solution is to use the EC25EFA-512-STD (or another standard/QuecOpen variant that supports the required 2G/3G bands).

Best Regards,
Aghelan