Two SIM cards having same IMSI

Question

Is there any possibility of having same IMSI(International Mobile Subscriber Identity) number in two different SIM(Subscriber Identity Module) Cards globally.

I'm asking this because there is possibility of existing same mobile number in different countries across the world.

Answer 1

IMSI contains country code MCC and Network code MNC

Theoritically it is unique across the world.

But can be copied or spoofed.

It cannot be duplicated in different countries.