Sim Card Programming

what are you trying to achieve?

What network are you on?

Just to be clear on your intention. You want to clone a SIM card in its totality including the key number and NAC details to have 2 SIM cards with the same access details?

Or,

You for some reason are still saving some data or contacts to a SIM that you wish to have an accessible back up of?

This is entirely impossible.

You can back up contacts/texts stored on a SIM, but this is basically obsolete now. You cannot make a working copy of a card.

If you had sims, there would be nothing stopping you from writing to them. But as explained above, the problem will be that you won't be able to clone the required information from the original sim because the way you would need to go about that would involve reading it over and over and over again, which would cause it to burn out before you could extract the information you need.

So you could write to them……..you just won't know what you have to write to them to duplicate your original

As others have explained, those aren't SIMs in the Telco sense. They are programmable 2FA access tokens. Used in network and systems access.

The cryptographic key is not in readable memory.

Yes.

No.