@Ak.niyaz 

Good day,

Thank you very much for your time and patience.

Sorry for the delay.

May I know where are you located and who is your SIM card provider？

How long have you had the device and did the issue just start recently?

Is there any firmware update or Did some new devices join in Archer MR600?

If you put the SIM card into the smartphone, did the smartphone work well?

 

Please also check if the SIM card holder was firmly inserted in case there is a bad connection;

Thanks a lot.

I have the same problem and the SIM works with the mobile but not on the router. I dont know how to activate the PIN while the SIM is in the router ( it's the suggested solution in another chatforum). Otherwise I am at loss.

@Gohr 

HI, did you mean the SIM card status now is “PIN required”?

If yes, could you please have a look at this link to unlock the PIN?

[Troubleshooting]No internet service on LTE Gateway Router