Settings is the best source
Open Settings, General, About and scroll to IMEI, IMEI2, MEID or related identifiers.
Apple guide
Find IMEI on iPhone
You can find an iPhone IMEI in Settings, with a short dial code or on original purchase materials. Save it before you sell, repair or report a device.
IMEI CheckDevice LookupUsed Phone Guide
Use *#06#
The dial code displays device identifiers without needing to search through menus.
Use box or account records
If the phone is lost, check the original box, invoice, carrier account or Apple account device list.
Common questions
Which IMEI should I check on dual-SIM iPhone?
Use the IMEI connected to the line or eSIM you want to verify. For status checks, IMEI 1 is often the primary reference.
Should I post my IMEI publicly?
No. Treat IMEI like a device identifier and share it only with trusted services, carriers or buyers in a private channel.