Suggest me a good anti thief for iPhone

Guys I quickly need a good anti thief software for my iPhone. I wouldn't mind paying for it, in app store OR cydia.

My requirement is, it shouldn't get removed if the iPhone is restored. If it gets removed then whats the point in it ? And also I doubt if any cydia tweaks would work since they get removed once the iPhone is restored. I am aware of Cydia tweak such as I Got You, but I don't see any point in using it.

Thank you in advance

Its called find my iphone

Apple - iPhone 4S - Locate your missing iPhone with Find My iPhone.

^ 1. It requires internet
2. Wouldn't work if iPhone is restored.

if you have a passcode to open your iphone then it will find it, and the thief will have to break the passcode to restore the phone

Nothing is going to work after an iPhone has been erased and restored. It doesn't matter what the software description says, if someone stole your iPhone, and erased it and made it theirs, whatever software you had will be gone.

Soooo the moral of the story here is: put a passcode on your iPhone, and use Find My iPhone. This has worked for HUNDREDS of people, and that's just the stories we know about ...