You mean the physical plastic cards? Some newer phone support https://en.wikipedia.org/wiki/ESIM https://en.wikipedia.org/wiki/ESIM or a combination of SIM and

You mean the physical plastic cards? Some newer phone support https://en.wikipedia.org/wiki/ESIM https://en.wikipedia.org/wiki/ESIM or a combination of SIM and eSIM. Lost is quickly moving the card from one device to another, or swapping when travelling.