Answer (1 of 4): IMSI number is always stored in the operator records…it has no purpose for you…if you have lost a sim card take a new one with the same number…there will be a new IMSI for this…
How will I know my 19 digit sim no. If I have lost the sim packet? - Quora
qph.cf2.quoracdn.net/main-qimg-5461dfdcc0fc3471b86
SIM card ICCID numbers explained
Is it possible to obtain SIM card information and the number of SIM cards from IMEI? - Quora
I have lost my mobile. How do I find my IMEI number? - Quora
What happens if I remove my sim card and I put in a new one? - Quora
Is there any way to know the ICCID serial number of a lost SIM card? - Quora
How will I know my 19 digit sim no. If I have lost the sim packet? - Quora
How to know the SIM card details - Quora
Can I find out the mobile number using the IMEI number of the device carrying that SIM card? - Quora
How to track a cell phone with an IMEI or SIM card number - Quora
How to check a SIM number - Quora
Is there any way to know the ICCID serial number of a lost SIM card? - Quora