# MC7455 No service **URL:** \ **Category:** MC/EM Series\ **Created:** [May 7, 2024, 9:19am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263 "2024-05-07T09:19:15Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![choki.dorji](https://avatars.discourse-cdn.com/v4/letter/c/f17d59/32.png) [@choki.dorji](https://forum.sierrawireless.com/u/choki.dorji)\ **Post date:** [May 7, 2024, 9:19am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/1 "2024-05-07T09:19:15Z")
I have MC7455 module used on windows OS. it is sowing no service in the network connection. The SIM is in working condition. I had the generic Firmware installed and the driver also installed in windows. it is identifying SIM network but it is showing as no service. Please see the attached screenshot. ![Screenshot (1)](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/3/3b299e31b0b86abfaf3aa75697b85a06f298f82c.png) the following are the behavior that was noticed on these modems: 1. when the band is set to 9 using the AT!BAND=09, throws error. but it can be set to other bands except for the band 9 LTE all 2.not sure this is related, all the modems that can’t be set to band 9 LTE ALL are with the no service on the cellular. 2. These modems also didn’t had the restore points. Normally the restore point 01 is for sierra-provided SKU configuration. this is not available, if this means something. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [May 7, 2024, 9:29am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/2 "2024-05-07T09:29:52Z")
what is the return of the followings for OK module and NOK modules? ```auto AT!ENTERCND="A710" ati3 AT!impref? AT+cpin? aT!pcinfo? AT+cfun? AT!selrat? aT!band? AT!GSTATUS? AT+CGDCONT? ``` ---
**Author:** ![choki.dorji](https://avatars.discourse-cdn.com/v4/letter/c/f17d59/32.png) [@choki.dorji](https://forum.sierrawireless.com/u/choki.dorji)\ **Post date:** [May 8, 2024, 3:11am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/3 "2024-05-08T03:11:11Z")
Hi Jyijyi, Thanks for you quick response. Please see the results of the AT commands that you have sent. Working module: ![2404-4112](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/c/cf2c3430a1dcb8b6e7acc22ffc1a65f9f32a03e8.jpeg) AT!IMPREF? !IMPREF: preferred fw version: 02.38.00.00 preferred carrier name: GENERIC preferred config name: GENERIC\_002.082\_000 preferred subpri index: 000 current fw version: 02.38.00.00 current carrier name: GENERIC current config name: GENERIC\_002.082\_000 current subpri index: 000 OK at!band? Index, Name 00, All bands OK at+cgdcont? +CGDCONT: 1,“IPV4V6”,“yesinternet”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0 OK atr ERROR at!band=09 OK at!BAND=00 OK AT!CPIN? ERROR AT!PCINFO? State: Online LPM voters - Temp:0, Volt:0, User:0, W\_DISABLE:0, IMSWITCH:0, BIOS:0, LWM2M:0, OMADM:0, FOTA:0 LPM persistence - None OK AT!SELRAT? !SELRAT: 00, Automatic OK ATi3 Manufacturer: Sierra Wireless, Incorporated Model: MC7455 Revision: SWI9X30C\_02.38.00.00 rE3F3E55C03AE94 jenkins 2022/01/13 05:16:00 MEID: 35907206958601 IMEI: 359072069586010 IMEI SV: 22 FSN: LQ048407150110 +GCAP: +CGSM OK AT!GSTATUS? !GSTATUS: Current Time: 174 Temperature: 52 Reset Counter: 2 Mode: ONLINE System mode: LTE PS state: Attached LTE band: B1 LTE bw: 20 MHz LTE Rx chan: 299 LTE Tx chan: 18299 LTE CA state: NOT ASSIGNED EMM state: Registered Normal Service RRC state: RRC Connected IMS reg state: No Srv PCC RxM RSSI: -72 RSRP (dBm): -105 PCC RxD RSSI: -93 RSRP (dBm): -140 Tx Power: – TAC: E86D (59501) RSRQ (dB): -14.3 Cell ID: 01A75942 (27744578) SINR (dB): 0.2 OK AT+CFUN? +CFUN: 1 OK AT!IMPREF? !IMPREF: preferred fw version: 02.38.00.00 preferred carrier name: GENERIC preferred config name: GENERIC\_002.082\_000 preferred subpri index: 000 current fw version: 02.38.00.00 current carrier name: GENERIC current config name: GENERIC\_002.082\_000 current subpri index: 000 OK at!band? Index, Name 00, All bands Non-working module: ![non working 2404-4139](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/6/60d0bb79ce33a6694a7c2444d7955ad032b5ecdc.png) AT!IMPREF? !IMPREF: preferred fw version: 02.38.00.00 preferred carrier name: GENERIC preferred config name: GENERIC\_002.082\_000 preferred subpri index: 000 current fw version: 02.38.00.00 current carrier name: GENERIC current config name: GENERIC\_002.082\_000 current subpri index: 000 OK AT!IMAGE? TYPE SLOT STATUS LRU FAILURES UNIQUE\_ID BUILD\_ID FW 1 GOOD 6 0 0 ?_? 02.33.03.00_? FW 2 GOOD 7 0 0 ?_? 02.38.00.00_? FW 3 GOOD 3 0 0 ?_? 02.32.11.00_? FW 4 EMPTY 0 0 0 Max FW images: 4 Active FW image is at slot 2 TYPE SLOT STATUS LRU FAILURES UNIQUE\_ID BUILD\_ID PRI FF GOOD 0 0 0 002.070\_005 02.32.11.00\_ATT PRI FF GOOD 0 0 0 002.082\_000 02.38.00.00\_GENERIC PRI FF GOOD 0 0 0 002.079\_002 02.33.03.00\_VERIZON Max PRI images: 50 OK AAT!ENTERCND=“A710” OK ATI3 Manufacturer: Sierra Wireless, Incorporated Model: MC7455 Revision: SWI9X30C\_02.38.00.00 rE3F3E55C03AE94 jenkins 2022/01/13 05:16:00 MEID: 35907206958347 IMEI: 359072069583470 IMEI SV: 22 FSN: LQ003185220310 +GCAP: +CGSM OK AT+CPIN? +CPIN: READY OK AT!PCINFO? State: Online LPM voters - Temp:0, Volt:0, User:0, W\_DISABLE:0, IMSWITCH:0, BIOS:0, LWM2M:0, OMADM:0, FOTA:0 LPM persistence - None OK AT+CFUN? +CFUN: 1 OK AT!SELRAT? !SELRAT: 00, Automatic OK AT!BAND? Index, Name, GW Band Mask L Band Mask TDS Band Mask 00, All bands, 0002000007C00000 00000100330818DF 0000000000000000 OK AT!BAND=09 ERROR AT!GSTATUS? !GSTATUS: Current Time: 286 Temperature: 49 Reset Counter: 2 Mode: ONLINE System mode: WCDMA PS state: Not attached WCDMA band: WCDMA 850 WCDMA channel: 4436 GMM (PS) state:DEREGISTERED LIMITED SERVICE MM (CS) state: IDLE LIMITED SERVICE WCDMA L1 state:L1M\_PCH\_SLEEP LAC: 7850 (30800) RRC state: DISCONNECTED UTRAN Cell ID: 03A30169 (61014377) RxM RSSI C0: -76 RxD RSSI C0: — RxM RSSI C1: — RxD RSSI C1: — OK AT+CGDCONT? +CGDCONT: 1,“IPV4V6”,“3gnet”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0 OK ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [May 8, 2024, 3:36am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/4 "2024-05-08T03:36:16Z")
how about setting to LTE technology by AT!SELRAT? You can check the setting of AT!SELRAT=? ---
**Author:** ![choki.dorji](https://avatars.discourse-cdn.com/v4/letter/c/f17d59/32.png) [@choki.dorji](https://forum.sierrawireless.com/u/choki.dorji)\ **Post date:** [May 8, 2024, 6:17am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/5 "2024-05-08T06:17:25Z")
I tried to set the selrat to LTE but it is throwing error. it looks like the module cannot be set to anything related to LTE technology. the following two commands returns error: 1. AT!BAND=09 2. AT!SELRAT=06 The command AT+CGDCONT? on the non-working module returns: AT+CGDCONT? +CGDCONT: 1,“IPV4V6”,“3gnet”, “0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0 but on the working module it returns as below: +CGDCONT: 1,“IPV4V6”,“yesinternet”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0 does this indicate anything? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [May 8, 2024, 6:21am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/6 "2024-05-08T06:21:31Z")
it indicates different APN is used in the module Are they using the same SIM card for your testing above? Is no, have you tried to swap the SIM card between two modules? Is the 3gnet SIM card only workable in 3G? ---
**Author:** ![choki.dorji](https://avatars.discourse-cdn.com/v4/letter/c/f17d59/32.png) [@choki.dorji](https://forum.sierrawireless.com/u/choki.dorji)\ **Post date:** [May 8, 2024, 6:53am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/7 "2024-05-08T06:53:14Z")
The same SIM card has been used for the test and the APNon the non-working modules is showing up as 3gnet. i also tried to set the APN to “yesinternet” using the command AT+CGDCONT= But it is still showing as no service on the cellular connection. The 3gnet is being shown on every unit which have this issue. seems like it is showing as “3gnet” for every different SIM card used on those non-working modules. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [May 8, 2024, 7:05am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/8 "2024-05-08T07:05:37Z")
have you checked if AT!UIMS? is equal to 0 in both OK module and NOK module? ---
**Author:** ![choki.dorji](https://avatars.discourse-cdn.com/v4/letter/c/f17d59/32.png) [@choki.dorji](https://forum.sierrawireless.com/u/choki.dorji)\ **Post date:** [May 8, 2024, 9:14am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/9 "2024-05-08T09:14:24Z")
The AT!UIMS? is returning 0 on both the working and Non-working module. Anther thing noticed on the non-working module is that even if the new SIM from different provider is used, the command AT+CGDCONT? returns +CGDCONT: 1,“IPV4V6”,“yesinternet”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0 Seems like the APN does not change according to the SIM used but on the working module it changes the APN according to the SIM card used. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [May 8, 2024, 9:36am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/10 "2024-05-08T09:36:30Z")
didn’t the NOK module is using 3gnet as APN here? > [@MC7455 No service](https://forum.sierrawireless.com/t/mc7455-no-service/32263/3): > > Hi Jyijyi, Thanks for you quick response. Please see the results of the AT commands that you have sent. Working module: AT!IMPREF? !IMPREF: preferred fw version: 02.38.00.00 preferred carrier name: GENERIC preferred config name: GENERIC\_002.082\_000 preferred subpri index: 000 current fw version: 02.38.00.00 current carrier name: GENERIC current config name: GENERIC\_002.082\_000 current subpri index: 000 OK at!band? Index, Name 00, All bands OK … (not using “yesinternet”) BTW, have you compared AT!CUSTOM? setting ---
**Author:** ![choki.dorji](https://avatars.discourse-cdn.com/v4/letter/c/f17d59/32.png) [@choki.dorji](https://forum.sierrawireless.com/u/choki.dorji)\ **Post date:** [May 8, 2024, 10:09am UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/11 "2024-05-08T10:09:35Z")
Yes it was before i set it to “yesinternet” and the SIM i am using just now is from different provider so i should have change when i use this SIM. But it remained at “yesinternet”. I have executed the AT!CUSTOM? on both the units: working Module: AT!CUSTOM? !CUSTOM: GPSENABLE 0x01 GPSLPM 0x01 IPV6ENABLE 0x01 SIMLPM 0x01 USBSERIALENABLE 0x01 Non-working Module: AT!CUSTOM? !CUSTOM: GPSENABLE 0x01 GPSLPM 0x01 IPV6ENABLE 0x01 UIM2ENABLE 0x01 SIMLPM 0x01 USBSERIALENABLE 0x01 SINGLEAPNSWITCH 0x01 It seems that the non-working module have the SINGLEAPNSWITCH. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [May 8, 2024, 12:58pm UTC](https://forum.sierrawireless.com/t/mc7455-no-service/32263/12 "2024-05-08T12:58:29Z")
Is there any improvement to make the same setting in at!custom?