How to lock sim on apple 14 iPhone?

Use a SIM PIN for your iPhone or iPad - Apple Support

"To protect your SIM card or eSIM from others using it for phone calls or cellular data, you can use a SIM PIN. Then, every time you restart your device or remove the SIM card, your SIM card or eSIM will automatically lock and you'll see "Locked SIM" in the status bar."

If you do use this feature, don't forget the code … or you might wind up having to ask your carrier for help.

Even if your eSIM is unlocked, it likely has a default PIN programmed into it.

In order to change the PIN to something memorable to you, you’ll first need to enter the current “default” PIN.

Different carriers use different default PINs.

Contact your carrier for assistance.

Once you’ve re-set your PIN and turned it “on”, you’ll need to use it each time your SIM is powered-up before your phone’s the telephony functions will become active.

You’ll also need to re-enter your PIN if you choose to change your SIM’s normal behavior back to “unlocked” as well.

Lastly, SIM PINs can be up to 8x numeric digits.

what do you mean?

how to setup an eSim on an iPhone?

About eSIM on iPhone - Apple Support

or how to lock your iphone so it will only ever work with your eSim?

if so then you can't only carriers can lock iphones to their service.