There are few people like me who used their smartphone for fun and do their most of the work on their systems but there are also many people who also have some important work stuff on their phones and they want total security on their phone.So , recently an app has been released on Cydia which will ensure that nobody would be able to use your iPhone apart from you.
RecognizeMe used the front facing camera of your iPhone 4 and iPad 2 to recognize the face of the person who is in front of iPhone then it recognizes that this person is the owner of the phone or not.You can also adjust the threshold for matching your iPhone which makes the app easy to recognize your iPhone even in off positions.
This app is only if jailbroken devices so those who want this app would have to jailbreak their device.And this is available for $6.99 on Cydia.