JavaCard OS

I am very glad to join in JavaCardOS community. I want to know if it is feasible to write Ki and IMSI codes to card.
In my opinion, after I do this, I will have a real gsm sim-card? Am I right?

Yes, you are right!

But firstly you have to get a real __clear__ couple (IMSI / KI). And then loading IMSI/Ki to SIM card is vendor-dependent technique.

The Ki on a SIM card when it's stored in a file can never be read by any external entity.