Nokia / HMD
Does the Nokia G21 support eSIM?
No, the Nokia G21 has no eSIM and only works with a physical SIM.
The Nokia G21 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 Nokia G21 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 Nokia G21
Can I use an eSIM on the Nokia G21?
No. The Nokia G21 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.