MC7455 only 3G connection

IoT Modules MC/EM Series
1

Having an issue where an MC7455 only gets a 3G fallback connection.
Other devices in the same location get strong LTE connections.
I tried to gather similar information like in this thread: MC7455 T-Mobile, cannot connect when BAND=09 (LTE ALL) - #2 by mlw
Any ideas on why I might be seeing this or what I could be missing?

# microcom -t 600000 /dev/ttyUSB2

at+cmee=1
OK
ati
Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.32.11.00 r8042 CARMD-EV-FRMWR2 2019/05/15 21:52:20
MEID: 35457251090128
IMEI: 354572510901283
IMEI SV: 19
FSN: LQ152316900110
+GCAP: +CGSM,+DS,+ES


OK
at!priid?
PRI Part Number: 9907763
Revision: 001.003
Customer: Generic-M2M

Carrier PRI: 9999999_9904594_SWI9X30C_02.32.11.00_00_ATT_002.070_005
Carrier PRI: 9999999_9905153_SWI9X30C_02.24.05.06_00_BELL_001.005_001
Carrier PRI: 9999999_9904609_SWI9X30C_02.24.05.06_00_GENERIC_002.026_001
Carrier PRI: 9999999_9905151_SWI9X30C_02.24.05.06_00_ROGERS_001.005_001
Carrier PRI: 9999999_9904779_SWI9X30C_02.24.03.00_00_SPRINT_002.022_001
Carrier PRI: 9999999_9905152_SWI9X30C_02.24.05.06_00_TELUS_001.005_001
Carrier PRI: 9999999_9907371_SWI9X30C_02.24.05.06_00_US-Cellular_000.003_001
Carrier PRI: 9999999_9904780_SWI9X30C_02.24.05.06_00_VERIZON_002.035_001
Carrier PRI: 9999999_9904930_SWI9X30C_02.24.03.00_00_VODAFONE_001.001_002

OK
at+cpin?
+CPIN: READY

OK
at+cimi
310170232204709

OK
at+cgdcont?
+CGDCONT: 1,"IP","control-tec01.com.attz","0.0.0.0",0,0,0,0

OK
at+cgpaddr=1
+CGPADDR: 1,10.64.10.141

OK

at+cops?
+cops: 0,0,"AT&T",2

OK
at!band?
Index, Name,                        GW Band Mask     L Band Mask      TDS Band Mask
00, All bands,                      0002000007C00000 00000100330818DF 0000000000000000


OK
at+cops=?
+CME ERROR: 3
ATI
Manufacturer: Sierra Wireless, Incorporated
Model: MC7455
Revision: SWI9X30C_02.32.11.00 r8042 CARMD-EV-FRMWR2 2019/05/15 21:52:20
MEID: 35457251090128
IMEI: 354572510901283
IMEI SV: 19
FSN: LQ152316900110
+GCAP: +CGSM,+DS,+ES

OK
AT+COPS=2
OK
AT+COPS=?
+COPS: (0,"AT&T","AT&T","311490",7),(0,"AT&T","AT&T","310260",7),(0,"AT&T","AT&T","313100",7),(0,"AT&T","AT&T","310410",2),(0,"AT&T MicroCell","AT&T Mic","310410",7),(0,"AT&T","AT&T","311882",7),(0,"AT&T","AT&T","312250",7),(0,"AT&T","AT&T","312530",7),(0,"AT&T","AT&T","310120",7),(0,"AT&T","AT&T","310260",2),(0,"AT&T","AT&T","311480",7),,(0,1,2,3,4),(0,1,2)

OK
AT!COPS=1,2,"311490",7
ERROR

OK
2 
at!gstatus?
!GSTATUS: 
Current Time:  1193		Temperature: 36
Reset Counter: 1		Mode:        ONLINE         
System mode:   WCDMA      	PS state:    Attached     
WCDMA band:    WCDMA 850  
WCDMA channel: 1062
GMM (PS) state:REGISTERED     	NORMAL SERVICE 
MM (CS) state: IDLE           	NORMAL SERVICE 

WCDMA L1 state:L1M_DCH        	LAC:           6798 (26520)
RRC state:   CELL_DCH       	UTRAN Cell ID: 04992AFF (77146879)
RxM RSSI C0:   -70		RxD RSSI C0: -67
RxM RSSI C1:    --- 		RxD RSSI C1:  ---
3

Are at!impref? and firmware version the same in both modules?

Are username and password needed?

How about forcing lte mode by at!selrat ?

4

Firmware is the same version on both modules.
Forcing lte mode by at!selrat=06 worked, the module was able to get an lte connection.
Is there any way to lock this setting? After a reboot the device went back to automatic mode and connected to 3G.
We are updating many devices with MC7455 modems in advance of the AT&T 3G shutdown this month and want to make sure 4G connections are working correctly.

5

At!selrat should be Persistent across power cycles

You might also see if at!band helps you