How do I know if my sim card is an esim

Go into settings > General > About > scroll down, you will see the section "Physical SIM" down below, if you have a SIM inserted. If you have an ESIM installed, it should claim "ESIM".

I hope this helps!

Already answered above. You have to look at the phone that you are asking about to see whether it is using SIM or eSIM.

I don't see this at all...would I see it if I'm not connected to cellular?... under cellular it says "issue" then when I click that it says "Cellular Issue, Your iPhone is currently unable to access cellular data or make and receive calls or messages"

After I updated to IOS 17.4.1 it still told me "an update is required to use cellular data on this iPhone"

Then gives me an option to "Set Up Cellular in settings" that says "You can transfer your phone number from another device..." then options to set up cellular or not set up cellular

How can I tell if my son is using a virtuesim card on one of my phones

Apple Support told me to contact carrier, and possibly also go to apple store...not too helpful yet.

How can I tell if my iPhone has a Sim card in it?

Already answered above.