EM7455 "Deregistered Attach Needed"

IoT Modules
1

How do I change “EMM state: Deregistered Attach Needed” to “EMM state: Registered Normal Service”.?

This state should change automatically. Is there any manual way?
AT!GSTATUS?
!GSTATUS:
Current Time: 5044 Temperature: 36
Reset Counter: 3 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 Attach Needed
RRC state: RRC Idle
IMS reg state: No Srv IMS mode: Normal

PCC RxM RSSI: 0 RSRP (dBm): 0
PCC RxD RSSI: 0 RSRP (dBm): 0
Tx Power: 0 TAC: FFFF (65535)
RSRQ (dB): 0.0 Cell ID: FFFFFFFF (4294967295)
SINR (dB): 0

OK
AT+CGDCONT?
ERROR
AT+CGDCONT?
+CGDCONT: 1,“IP”,“vzims”,“0.0.0.0”,0,0,0,0
+CGDCONT: 2,“IP”,“vzadmin”,“0.0.0.0”,0,0,0,0
+CGDCONT: 3,“IPV4V6”,"",“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
+CGDCONT: 4,“IPV4V6”,“vzwapp”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
+CGDCONT: 5,“IPV4V6”,“vzw800”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0
+CGDCONT: 6,“IPV4V6”,“vzwclass6”,“0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0”,0,0,0,0

OK
AT!SCACT=?
!SCACT: <state(0|1)>[,]

OK
AT!SCACT?
!SCACT: 1,0
!SCACT: 2,0
!SCACT: 3,0
!SCACT: 4,0
!SCACT: 5,0
!SCACT: 6,0

OK
AT!SCACT=1,3
ERROR
AT!SCACT=1,3
ERROR
AT!SCACT=1,3
ERROR
AT!SCACT=1,3
ERROR
AT!SCACT=1,3
ERROR
AT!SCACT=1,3
ERROR
AT!SCACT=1,3
ERROR

2

Hi @akn

The EMM status will change from Unsubscribe Attachment Required ”to“ EMM Status: Normal Service Registered ” when your EM7455 registers the network.
Please try it with some commands as below:
AT+CGDCONT=3,“IPV4V6”,“vzwinternet”
AT!RESET

3

I am currently testing both static and dynamic IP SIM. They use different class 3 APNs.
So I was testing this with empty APNs. AT+CGDCONT=3,“IPV4V6”,“”

I have tried AT+CGDCONT=3,“IPV4V6”,“vzwinternet” and AT!RESET now it shows
“EMM state: Deregistered Limited Service”

AT!GSTATUS?
!GSTATUS:
Current Time: 79 Temperature: 37
Reset Counter: 5 Mode: ONLINE
System mode: LTE PS state: Not attached
LTE band: B4 LTE bw: 20 MHz
LTE Rx chan: 2300 LTE Tx chan: 4294967295
LTE CA state: NOT ASSIGNED
EMM state: Deregistered Limited Service
RRC state: RRC Idle
IMS reg state: No Srv IMS mode: Normal

PCC RxM RSSI: -82 RSRP (dBm): -117
PCC RxD RSSI: -80 RSRP (dBm): -112
Tx Power: 0 TAC: 3174 (12660)
RSRQ (dB): -12.2 Cell ID: 01406901 (20998401)
SINR (dB): 0.4

4

What are the different AT commands to start/stop/re-start the registration process?

5

I have also tried manual registration with AT+COPS.

6

This ticket is the same as EM7455 "System mode: Unknown" Issue

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