# EM7455 can't connect to T-Mobile (+CME ERROR: no network service) **URL:** \ **Category:** MC/EM Series\ **Created:** [February 23, 2021, 5:15pm UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928 "2021-02-23T17:15:07Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![ww1](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/ww1/32/5936_2.png) [@ww1](https://forum.sierrawireless.com/u/ww1)\ **Post date:** [February 23, 2021, 5:15pm UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928/1 "2021-02-23T17:15:07Z")
I have a rebranded (Dell) EM7455 that works great on AT&T but I can’t get it to connect to T-Mobile. When I try AT!SCACT=1,1 it returns +CME ERROR: no network service I know my SIM is active because I can put it in a microtik router and everything works fine. What I have tried: 1a. Flashing the modem with the Generic firmware package: ``` sudo qmi-firmware-update -t /dev/ttyUSB0 --update-qdl SWI9X30C_02.33.03.00.cwe SWI9X30C_02.33.03.00_GENERIC_002.072_000.nvu sudo qmi-firmware-update -t /dev/ttyUSB0 --update-qdl SWI9X30C_02.33.03.00.cwe SWI9X30C_02.33.03.00_GENERIC_002.072_000.nvu ``` 1b. AT command results: ``` at!entercnd="A710" OK at!priid="9904609","002.072","GENERIC" OK at!priid? PRI Part Number: 9904609 Revision: 002.072 Customer: GENERIC Carrier PRI: 9999999_9904609_SWI9X30C_02.33.03.00_00_GENERIC_002.072_000 Carrier PRI: 9999999_9904594_SWI9X30C_02.32.11.00_00_ATT_002.070_002 Carrier PRI: 9999999_9904780_SWI9X30C_02.33.03.00_00_VERIZON_002.079_001 OK at!gobiimpref? !GOBIIMPREF: preferred fw version: 02.33.03.00 preferred carrier name: GENERIC preferred config name: GENERIC_002.072_000 preferred subpri index: 000 current fw version: 02.33.03.00 current carrier name: GENERIC current config name: GENERIC_002.072_000 current subpri index: 000 OK at!gstatus? !GSTATUS: Current Time: 168 Temperature: 27 Reset Counter: 12 Mode: ONLINE System mode: LTE PS state: Attached LTE band: B4 LTE bw: 20 MHz LTE Rx chan: 2300 LTE Tx chan: 20300 LTE CA state: NOT ASSIGNED EMM state: Registered Normal Service RRC state: RRC Idle IMS reg state: No Srv PCC RxM RSSI: -88 RSRP (dBm): -118 PCC RxD RSSI: -89 RSRP (dBm): -122 Tx Power: -- TAC: 352C (13612) RSRQ (dB): -10.6 Cell ID: 01713302 (24195842) SINR (dB): 6.6 OK at+creg? +CREG: 0,1 OK +CGREG: 0,1 OK at+cereg? +CEREG: 0,1 OK at!scact=1,1 +CME ERROR: no network service ``` 2a. Flashing the modem with the TMO (Generic) firmware package: ``` sudo qmicli -d /dev/cdc-wdm0 -p --dms-set-firmware-preference="02.30.01.01,002.045_001,GENERIC" sudo qmi-firmware-update -t /dev/ttyUSB0 --update-qdl SWI9X30C_02.30.01.01.cwe SWI9X30C_02.30.01.01_GENERIC_002.045_001.nvu ``` This particular package didn’t bring up /dev/ttyUSB2 until I did the following command as well ``` sudo qmicli -d /dev/cdc-wdm0 -p --dms-swi-set-usb-composition=6 ``` 2b. AT command results: ``` at!entercnd="A710" OK at!priid="9904609","002.045","GENERIC" OK at!gstatus? !GSTATUS: Current Time: 1052 Temperature: 26 Reset Counter: 11 Mode: ONLINE System mode: LTE PS state: Attached LTE band: B4 LTE bw: 20 MHz LTE Rx chan: 2300 LTE Tx chan: 20300 LTE CA state: NOT ASSIGNED EMM state: Registered Normal Service RRC state: RRC Idle IMS reg state: No Srv PCC RxM RSSI: -87 RSRP (dBm): -120 PCC RxD RSSI: -90 RSRP (dBm): -123 Tx Power: -- TAC: 352C (13612) RSRQ (dB): -12.9 Cell ID: 01713302 (24195842) SINR (dB): 4.0 OK at!impref? !IMPREF: preferred fw version: 02.30.01.01 preferred carrier name: GENERIC preferred config name: GENERIC_002.045_001 current fw version: 02.30.01.01 current carrier name: GENERIC current config name: GENERIC_002.045_001 OK at+creg? +CREG: 0,1 OK at+cgreg? +CGREG: 0,1 OK at+cereg? +CEREG: 0,1 OK at+cops? +cops: 0,0,"T-Mobile",7 OK at!scact=1,1 +CME ERROR: no network service ``` Any ideas? My modem with an AT&T SIM card works great (using the ATT package). ---
**Author:** ![ww1](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/ww1/32/5936_2.png) [@ww1](https://forum.sierrawireless.com/u/ww1)\ **Post date:** [February 23, 2021, 6:05pm UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928/2 "2021-02-23T18:05:23Z")
I tried on a non-rebranded EM7455 from Digikey, same issue. ---
**Author:** ![Vianney](https://avatars.discourse-cdn.com/v4/letter/v/71e660/32.png) [@Vianney](https://forum.sierrawireless.com/u/Vianney)\ **Post date:** [February 24, 2021, 4:47am UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928/3 "2021-02-24T04:47:18Z")
Hi @ww1 , The log shows the module is able to attach T-Mobile network successfully. Data connection just is activated when the module should be set APN corresponds to TMobile’s. Please share the response of PDP context configuration by the command below AT+CGDCONT? Thanks ---
**Author:** ![ww1](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/ww1/32/5936_2.png) [@ww1](https://forum.sierrawireless.com/u/ww1)\ **Post date:** [February 24, 2021, 2:53pm UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928/4 "2021-02-24T14:53:38Z")
Thanks for getting back to me so quickly! I thought it might be an APN issue, I tried “[fast.t-mobile.com](http://fast.t-mobile.com)” with IP, IPV4V6, and IPV6 for good measure. I also tried “[epc.t-mobile.com](http://epc.t-mobile.com)” ``` at+cgdcont? +CGDCONT: 1,"IPV4V6","fast.t-mobile.com","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0 OK ``` I will call T-mobile today and see if it is a problem on their end, but it sounds like there aren’t any red flags from the modem itself which is good to hear. ---
**Author:** ![ww1](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/ww1/32/5936_2.png) [@ww1](https://forum.sierrawireless.com/u/ww1)\ **Post date:** [February 24, 2021, 7:39pm UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928/5 "2021-02-24T19:39:59Z")
Called tech support. The T-Mobile “unlimited data” plans are cell phone only and can’t be used with WWAN modems ---
**Author:** ![ww1](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/ww1/32/5936_2.png) [@ww1](https://forum.sierrawireless.com/u/ww1)\ **Post date:** [February 26, 2021, 6:52pm UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928/6 "2021-02-26T18:52:18Z")
Tried 3 different plans, none of them worked. I wonder if T-Mobile just has the EM7455 blacklisted or something. I’ll post if I actually get it working, but at this point I might just stick with AT&T. ---
**Author:** ![brcisna](https://avatars.discourse-cdn.com/v4/letter/b/b487fb/32.png) [@brcisna](https://forum.sierrawireless.com/u/brcisna)\ **Post date:** [March 3, 2022, 1:42am UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928/7 "2022-03-03T01:42:19Z")
Hi ww1 Did you ever get your em7455 to work with T-Mobil? Trying to do the same,no luck. Thanks ---
**Author:** ![ww1](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/ww1/32/5936_2.png) [@ww1](https://forum.sierrawireless.com/u/ww1)\ **Post date:** [March 4, 2022, 6:20am UTC](https://forum.sierrawireless.com/t/em7455-cant-connect-to-t-mobile-cme-error-no-network-service/22928/8 "2022-03-04T06:20:14Z")
Yes! Most of my issues went away when I enabled “AUTO-SIM” Try the following command: !IMPREF=“AUTO-SIM” It should cause the modem to reset to the right firmware Edit: Actually no, I misremembered. Pretty sure T-Mobile never worked, we swapped to AT&T