How to identify SIM vendor?

IoT Modules
1

Is it possible for AT commands to give us the vendor details of a SIM?

Does the IMSI number encode vendor details? Our product might be used with just a small number of operators, so it’d be OK to store their vendor IDs if this is included as part of the IMSI number. Or, are there some additional fields we can query to understand who issued the SIM?

Thanks

2

With the command AT+COPS? to query the currently selected carrier.
And the IMSI number consists of MCC and MNC,you can see the operator of your sim card through MNC.