My last message was with the SIM that doesn’t work, on Telekom. Should I run the same tests with the one that works, Orange?
Doing it now.
Because of the truncated responses, I’ve had to run more than 1k commands (not exaggerating) for this debugging session 
Tests done with the Orange SIM (which worked the other day with EM7455 with SWI9X30C_02.38.00.00) and the second device with firmware SWI9X30C_02.33.03.00`:
B1
// truncated
!GSTATUS:
Current Time: 669 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: No band LTE bw: Unknown
LTE Rx chan: 20819 LTE Tx chan: 4294967295
LTE CA state: ACTIVE LTE Scell band:No band
LTE Scell bw:1.4 MHz LTE Scell chan:1
EMM state: Deregistered No Cell
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: 0 RSRP (dBm): 0
PCC RxD RSSI: 0 RSRP
// LATER also truncated
!GSTATUS:
Current Time: 849 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: No band LTE bw: Unknown
LTE Rx chan: 20819 LTE Tx chan: 4294967295
LTE CA state: ACTIVE LTE Scell band:No band
LTE Scell bw:1.4 MHz LTE Scell chan:1
EMM state: Deregistered Attach Need
// LATER not truncated
!GSTATUS:
Current Time: 914 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: No band LTE bw: Unknown
LTE Rx chan: 20819 LTE Tx chan: 4294967295
LTE CA state: ACTIVE LTE Scell band:No band
LTE Scell bw:1.4 MHz LTE Scell chan:1
EMM state: Deregistered No Cell
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: 0 RSRP (dBm): 0
PCC RxD RSSI: 0 RSRP (dBm): 0
SCC RxM RSSI: 0 RSRP (dBm): 0
SCC RxD RSSI: 0 RSRP (dBm): 0
Tx Power: -- TAC: 515D (20829)
RSRQ (dB): 39.7 Cell ID: 00000002 (2)
SINR (dB):
OK
B3
!GSTATUS:
Current Time: 1265 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1600 LTE Tx chan: 4294967295
LTE CA state: NOT ASSIGNED
EMM state: Deregistered Attach Needed
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: -75 RSRP (dBm): -114
PCC RxD RSSI: -71 RSRP (dBm): -109
Tx Power: -- TAC: 2786 (10118)
RSRQ (dB): -17.1 Cell ID: 00400702 (4196098)
SINR (dB): -5.6
OK
B7
!GSTATUS:
Current Time: 752 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: B7 LTE bw: 20 MHz
LTE Rx chan: 2950 LTE Tx chan: 4294967295
LTE CA state: NOT ASSIGNED
EMM state: Deregistered Attach Needed
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: -76 RSRP (dBm): -118
PCC RxD RSSI: -76 RSRP (dBm): -109
Tx Power: -- TAC: 2786 (10118)
RSRQ (dB): -12.6 Cell ID: 00400706 (4196102)
SINR (dB): 1.0
OK
B8
!GSTATUS:
Current Time: 800 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: No band LTE bw: 1.4 MHz
LTE Rx chan: 0 LTE Tx chan: 4294967295
LTE CA state: NOT ASSIGNED
EMM state: Deregistered No Cell
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: 0 RSRP (dBm): 0
PCC RxD RSSI: 0 RSRP (dBm): 0
Tx Power: -- TAC: FFFF (65535)
RSRQ (dB): 0.0 Cell ID: FFFFFFFF (4294967295)
SINR (dB):
OK
B20
!GSTATUS:
Current Time: 1002 Temperature: 27
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: No band LTE bw: 1.4 MHz
LTE Rx chan: 0 LTE Tx chan: 4294967295
LTE CA state: INACTIVE LTE Scell band:No band
LTE Scell bw:Unknown LTE Scell chan:0
EMM state: Deregistered No Cell
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: 0 RSRP (dBm): 0
PCC RxD RSSI: 0 RSRP (dBm): 0
SCC RxM RSSI: 0 RSRP (dBm): 0
SCC RxD RSSI: 0 RSRP (dBm): 0
Tx Power: -- TAC: 0000 (0)
RSRQ (dB): 0.0 Cell ID: 021D5E78 (35479160)
SINR (dB):
OK
Index, Name, GW Band Mask L Band Mask TDS Band Mask
13, CUSTOMER, 0000000000000000 0000000000080000 0000000000000000
OK
I then restarted and switched to “all bands” and it connected:
Index, Name, GW Band Mask L Band Mask TDS Band Mask
00, All bands 000200 0000000001000000 - B3 (1700)
0000000000800000 - B2 (1900)
0000000000400000 - B1 (2100)
OK
!GSTATUS:
Current Time: 541 Temperature: 39
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1600 LTE Tx chan: 19600
LTE CA state: INACTIVE LTE Scell band:B7
LTE Scell bw:20 MHz LTE Scell chan:2950
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv
PCC RxM RSSI: -83 RSRP (dBm): -117
PCC RxD RSSI: -78 RSRP (dBm): -112
SCC RxM RSSI: -91 RSRP (dBm): -119
SCC RxD RSSI: -88 RSRP (dBm): -110
Tx Power: -- TAC: 2786 (10118)
RSRQ (dB): -14.6 Cell ID: 00400702 (4196098)
SINR (dB): 0.6
OK
After it connected, I restricted it to B3 again (since it connected on B3) and it reconnected successfully:
Index, Name, GW Band Mask L Band Mask TDS Band Mask
13, CUSTOMER, 0000000000000000 0000000000000004 0000000000000000
OK
!GSTATUS:
Current Time: 947 Temperature: 47
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1600 LTE Tx chan: 19600
LTE CA state: NOT ASSIGNED
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv
PCC RxM RSSI: -84 RSRP (dBm): -116
PCC RxD RSSI: -80 RSRP (dBm): -111
Tx Power: 23 TAC: 2786 (10118)
RSRQ (dB): -15.1 Cell ID: 00400702 (4196098)
SINR (dB): 1.4
OK
As summary,
Telekom SIM: NOK to connect with standalone B1, B3, B8,B20 (no B7 with this operator)
Orange SIM: OK to connect with B7+B3, B3+B7, but NOK to connect with standalone B1, B3,B7,B8,B20
I have no idea at all, it does not make sense that it works with LTE CA but not with single band
The summary is correct thank you for your help!
Telekom SIM again (truncated):
!GSTATUS:
Current Time: 345 Temperature: 29
Reset Counter: 1 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: B3 LTE bw: 20 MHz
LTE Rx chan: 1798 LTE Tx chan: 19798
LTE CA state: NOT ASSIGNED
EMM state: Deregistered PLMN Search
RRC state: RRC Idle
IMS reg state: No Srv
PCC RxM RSSI: -76 RSRP (dBm): -109
PCC RxD RSSI: -76 RSRP (dBm): -111
Tx Power: -- TAC: B7AF (47023)
I guess it’s best to have a variety of modems in case this happens with some providers. Thanks again!
Does it work with these apn in +cgdcont?
Yes, it works with the apn broadband, as opposed to internet which worked with the FIBOCOM.
I don’t understand why, but this issue is solved.
I learned a lot in this thread, I feel capable of doing a lot more debugging, so thank you for the learning experience!