Is cloning your own SIM card illegal?

I have this question whether cloning your own SIM card illegal? or not?

This will depend on where you live. But it will generally NOT be illegal however it will (or could) be against the T&C’s of the network provider.

Thanks for the info.

And what if I don’t want the cloned SIM anymore and if I destroy it will my original SIM be affected by that I me will my SIM function normally or will it be of no use to me?

Not sure sorry.

If you get any info please let me know…