If your phone is still working:
1. Go to the settings menu on your phone
2. Scroll down to the bottom where you will see "About Phone" press that option
3. In the next screen you will see a "More Options" selection press that
4. On the next screen you will see "Status" and once you press that you will see your IMEI number
If your phone is not working:
1. Check the back of your OPPO Find 5 box and it will be listed right above the bar code.