To turn on find my iphone in your device just follow these simple steps:
Firstly open your device setting.
Then click on the ‘Apple ID’ (At your name which is on top ).
When it open click on the ‘find my’ tap.
Then click on ‘find my phone’.
Then switch it ON.
When it ON then also set find my network and send last location for extra security.
When you turn it ON you will find your device which is stolen or lost easily by tracking the ID.