Open Settings → About phone for the full model number, then Connections → SIM manager for Add eSIM. Older software may say SIM card manager and Add mobile plan. If neither option is available, ask Samsung or the selling carrier about that exact model and software. Ask the original carrier separately about unlocking.
An EID indicates eSIM hardware. It does not prove the phone is unlocked, that every provider will accept it or that a plan includes coverage at your destination. Do not send us your IMEI, EID or account details.