Samsung
Does the Galaxy A51 support eSIM?
No, the Galaxy A51 has no eSIM and only works with a physical SIM.
The Galaxy A51 does not have eSIM. For mobile data abroad you will need a physical (travel) SIM with this device, or roaming from your own provider.
Source: GSMArena
Check your Galaxy A51 for an eSIM yourself
Dial *#06# on your phone. A 32-digit EID number means your phone has an eSIM. On iPhone check Settings > General > About; on Android check Settings > SIM manager.
Frequently asked questions about the Galaxy A51
Can I use an eSIM on the Galaxy A51?
No. The Galaxy A51 is not eSIM-compatible and only works with a physical SIM. For mobile data abroad you'll need a physical travel SIM with this device.