Open Settings
Tap General
Tap About
Find IMEI
Press and hold the IMEI number to copy it
Dial *#06# on the Phone app
View the IMEI on the screen
Check the SIM tray on some iPhone models
Check the back of the device on some older iPhone models
Connect iPhone to a computer
Open Finder on Mac or iTunes on Windows
Select the iPhone
View the IMEI in device information
Check the original box
Find the IMEI label on the packaging