The IMEI and EID are two ID numbers built into your phone. You do not need them for most Vuoly purchases, but a few plans from local operators require them to issue the eSIM, and support may ask for them when troubleshooting.
What they are
IMEI identifies your phone itself. It is used to check that a device supports eSIM and is carrier unlocked.
EID identifies your phone's built-in eSIM chip. It is used to deliver an eSIM to the right device.
How to find them
Any phone: open the dialer and enter *#06#. The IMEI and EID appear on screen.
iPhone: go to Settings > General > About and scroll down to IMEI and EID.
Android: go to Settings > About phone (on Samsung: Settings > About phone > Status information).
When Vuoly asks for them
If a plan needs your IMEI or EID, you will be asked for them during or right after checkout. Only share these numbers in your purchase flow or in a support conversation.