Dial *#06# to get your iPhone's IMEI.
How i can find IMEI?
In settings
Go to Settings > General > About and look for your device's IMEI
Dial *#06# to get IMEI
Before trying anything else, you can try simply dialing *#06# on your iPhone (or any mobile phone), this should retrieve the IMEI number.
On back side of iPhone
The iPhone 5/5c/5s/6/6+ and the original iPhone have the IMEI number engraved on the back of the phone, near the bottom.
On SIM card tray
For find imie, you need remove sim card tray from device, and then you can find imei on it. (not on all models you can find imei via sim tray)