Lockwatch secretly takes a photo using the front camera when someone enters an incorrect unlock code on your phone. It then emails you a picture of the intruder along with their GPS location, without them knowing. The app has helped recover many lost and stolen phones, and has been featured in several TV and online news stories. Lockwatch uses Android's built-in lock screen and has a small app size, running only when an incorrect unlock code is entered. Note: You must enter at least four digi