A physical SIM card is a smartcard, and in many ways is exactly like a yubikey. A yubikey even presents as a USB smartcard. The attacks on SIM cards are not on

A physical SIM card is a smartcard, and in many ways is exactly like a yubikey. A yubikey even presents as a USB smartcard. The attacks on SIM cards are not on the SIM itself, but by the carrier binding your identity to a different card. A function they must perform at least sometimes! If you lost your yubikey, I'm sure you want your replacement to be able to activate your cell phone.