SIM does not automatically search for a network when inserted

IoT Modules LTE Standard Module
1

My Module Information:

ATI
Quectel
EC20F
Revision: EC20CEHCLGR08A04M1G

OK

When I insert a SIM, it always shows +CREG: 0,2, and I have to manually use commands to reactivate its signal. However, when I replace it with a new SIM, the network status goes back to +CREG: 0,2. My SIM is completely normal

// Inserted New SIM
+QSIMSTAT: 1,1

+CPIN: READY

+QUSIM: 1

+QIND: SMS DONE

+QIND: PB DONE

// Check Network Registration
> AT+CREG?
+CREG: 0,2 // Looking for network

OK

// Turn off SIM
> AT+CFUN=0
OK

+QSIMSTAT: 1,0

// Turn on SIM
> AT+CFUN=1
OK

+QSIMSTAT: 1,1

+CPIN: READY

+QUSIM: 1

+QIND: SMS DONE

// Check Network Registration
> AT+CREG?
+CREG: 0,1 // Registered

OK

// Uninsert the SIM from port
+QSIMSTAT: 1,0

+CPIN: NOT READY

// Inserted New SIM
+QSIMSTAT: 1,1

+CPIN: READY

+QUSIM: 1

+QIND: SMS DONE

+QIND: PB DONE

// Check Network Registration
> AT+CREG?
+CREG: 0,2 // Looking for network again

So every time I insert a new SIM, I have to manually reset it to register the network, which is really inconvenient. Do you know what my situation is?

Best regards,
Vy Nghia

2

Hi @vynghia
Can you use AT+COPS? Check whether the network is automatically searched. In addition, ensure that the APN is correctly configured and the antenna is properly connected.