nRF9151 DK Not Registering to Network with Onomondo SIM (India)

Question

Hello Nordic Team, 
 I’m using the nRF9151 DK board in Surat, Gujarat, India with a valid Onomondo SIM card . I’ve followed the setup instructions as per the Nordic Academy Cellular IoT Fundamentals (Lesson 2, Exercise 1) and flashed the AT command sample firmware from the nRF Connect SDK. 
 However, the device is not registering to the network , and I’m receiving the following AT command output: 
 > AT+CFUN=4 OK 
 +CEREG: 0 
 > AT+CGDCONT=0,"IP","onomondo" OK 
 > AT+COPS=0 OK 
 > AT%XSYSTEMMODE=1,0,0,0 OK 
 > AT+CFUN=1 OK 
 > AT+CEREG=2 OK 
 +CEREG: 4 
 > AT+CEREG? +CEREG: 2,4 OK 
 > AT+CGATT? +CGATT: 0 OK 
 > AT+CGPADDR=0 OK 
 Issue:

The modem never registers successfully ( +CEREG: 4 ).

+CGATT: 0 indicates that it's not attached to the packet service.

I tried using nRF Cellular Monitor , but it also shows no network registration (I’ve attached a screenshot for your reference).

The Onomondo SIM works fine in a smartphone , so I don't believe the issue is with SIM activation or coverage. I’ve verified the firmware is the AT command sample from the SDK.

Additional Info:

Location: Surat, Gujarat, India

Board: nRF9151 DK

SIM: Onomondo (APN: onomondo )

SDK Sample: AT Command sample

Firmware: Flashed correctly and able to interface via serial

Commands used: as shown above

%XSYSTEMMODE=1,0,0,0 to enable LTE-M only (since Onomondo uses LTE-M) Using AT+CFUN=4 before config and AT+CFUN=1 after setup

Request: 
 Can you please help troubleshoot why the nRF9151 DK is not registering to the LTE-M network with this Onomondo SIM, despite correct setup and confirmed SIM activation? 
 Any guidance on additional steps to debug or firmware configurations to try would be greatly appreciated. 
 Thank you!