Open the Phone app
Dial *#06#
View the IMEI number on the screen
Open Settings
Tap About phone
Tap Status or IMEI information
Check the IMEI number listed there
Remove the SIM tray
Look for the IMEI printed on the tray or device body
Check the original phone box
Find the IMEI label on the packaging
Open the Google Find My Device app or website
Select your device
View the device details for the IMEI number