And to be somewhat more pedantic, it even is not "unique device identifier" of the SIM, as SIM is not an device, but software application (typically one of appl

And to be somewhat more pedantic, it even is not "unique device identifier" of the SIM, as SIM is not an device, but software application (typically one of applications) running on some hardware platform (usually an ICC, which is what is colloquially called "SIM card")