Problem with Verizon SIM on EM7455

IoT Modules MC/EM Series
1

Hi, we have a problem with the Verizon 4G LTE SIM card with our 7455 module. On our embedded board, at+cpin? will return ‘SIM not inserted’.
On the Sierra Wireless eval board with the same Verizon SIM card, the at+cpin works ok, but we are not able to get it to connect to the cell network. I tried vzwinternet and all other common APNs, but still it does not attach to the cell network.

I tried both GENERIC and VERIZON images. Both behave the same.

My ATT and Tmobile SIM cards all work fine on both our embedded board, and on the Sierra Wireless eval board.

Thanks for all your input

2

Could you get the following AT command returns when using the Verizon SIM on your embedded board?

  • ATI
  • AT!IMPREF?
  • AT+CGDCONT?
  • AT!GSTATUS?
  • AT!PCINFO?
  • AT!CUSTOM?
3

Hi Tomato, thanks for your reply. Here are the output for the commands you like me to run. These are run on the Sierra eval kit with a EM7455 module and a Verizon SIM. The problem I am having is that the module cannot connect to the network.

The same module works perfectly with a Tmobile and AT&T SIM card.

ati
Manufacturer: Sierra Wireless, Incorporated
Model: EM7455
Revision: SWI9X30C_02.24.05.06 r7040 CARMD-EV-FRMWR2 2017/05/19 06:23:09
MEID: 35907306139430
IMEI: 359073061394304
IMEI SV: 12
FSN: LF833224780210
+GCAP: +CGSM

OK
at!impref?
!IMPREF:
preferred fw version: 02.24.05.06
preferred carrier name: GENERIC
preferred config name: GENERIC_002.026_000
current fw version: 02.24.05.06
current carrier name: GENERIC
current config name: GENERIC_002.026_000

OK
at+cgdcont?
+CGDCONT: 1,“IPV4V6”,"",“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0

OK
at!gstatus?
!GSTATUS:
Current Time: 13442 Temperature: 22
Reset Counter: 1 Mode: ONLINE
System mode: WCDMA PS state: Not attached
WCDMA band: WCDMA 850
WCDMA channel: 4385
GMM (PS) state:DEREGISTERED PLMN SEARCH
MM (CS) state: IDLE NO IMSI

WCDMA L1 state:L1M_PCH_SLEEP LAC: D8E7 (55527)
RRC state: DISCONNECTED Cell ID: 033B8F3F (54234943)
RxM RSSI C0: -94 RxD RSSI C0: —
RxM RSSI C1: — RxD RSSI C1: —

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!custom?
!CUSTOM:
GPSENABLE 0x01
GPSLPM 0x01
IPV6ENABLE 0x01
UIM2ENABLE 0x01
SIMLPM 0x01
USBSERIALENABLE 0x01
SINGLEAPNSWITCH 0x01

OK

4

Hi,

I have some advice for you as below:

  1. You can upgrade the EM7455 to the latest firmware SWI9X30C_02.33.03.00 and try it again.
    This FW is here:
    https://source.sierrawireless.com/resources/airprime/minicard/74xx/airprime-em_mc74xx-approved-fw-packages/#sthash.YH3g7RUE.k9MP7764.dpbs

  2. You can try to restore device to saved restore point with some AT commands as below:

AT!ENTERCND=”A710”
AT!RMARESET=1
AT!RESET
Power off/on module and wait for a while.

Then enable Verizon LTE band 4 and APN Verizon operator:
AT!ENTERCND=”A710”
AT!BAND=10,“Band4”,0,8,0
AT+CGDCONT= 3,“IPV4V6”,“vzwinternet”
AT!RESET

Enter AT+COPS=? to see what networks are visible to you

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