The identifier of the eSIM chip itself. Seeing an EID in your phone settings usually means the phone supports eSIM.
EID stands for eUICC identifier. Where the ICCID names a profile, the EID names the chip that holds the profiles, so it stays the same when you delete and install profiles.
Some providers ask for the EID to prepare a profile for a specific device. Most travel eSIMs skip this step and use a QR code instead.
What to check
- Find it in the phone's About or SIM settings
- Only share it with the provider you bought from