If you value your iDevice I highly reccomend the Jailbreak tweak iGotYa by Antonio Calatrava.
iGotYa takes a photo of your thief’s face (if you have front facing camera) and get the location where your iPhone is if your passcode is entered incorrectly or if a non registered fingerprint is used (You will need to have one of these in place to protect your iPhone).
The photo is taken silently and does not alert the their and the image and location is sent directly to your email. You can also allow access to the iPhone with a wrong code entered if you wish but all your personal data (SMS, Call History Web History, Mail, etc) will be hidden.
This tweak is just €3.99 and offers a free trial and can be purchased (once purchase is enabled in iOS 9) from the ModMyi repo.