There are 3 different ways to find your IMEI/MEID/ESN number on your iPhone. Try any of them.

Option 1:

• Dial *#06# and the IMEI /MEID/ESN will show on the screen.
  

Option 2:

1. Go to Settings
2. Tap General
3. Tap About
4. Scroll down and locate the IMEI/MEID/ESN number.
   

Option 3:

1. Insert a paper clip or a SIM-eject tool into the hole beside the tray
2. Eject the tray
3. Then view the IMEI number on the tray.