I have just bought an iphone 4?

Can anyone tell me where i can get the tracker app in case it gets stolen, and the app what takes a picture of anyone trying to access your phone, and also what are good apps are out there please.

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There should be an app already on there that is called find my iPhone. I think you should definitely set that up, it will help if, god forbid, your phone ever gets stolen. I've had my phone stolen before and I couldn't get it back because it wasn't an iPhone and it wasn't a phone that could have apps on it to help me find it. The app that takes a picture of anyone trying to get in your iPhone is called iGotYa. As the website below says, it only works for phones that have a front facing camera. It will work for your iPhone (yay!) :) There are two apps that I think are necessary for any smartphone. These apps are the AVG Anti- Virus app which scans all of your apps when you download them and it scans your phone every once in a while to make sure there are no threats. The other app is any battery saver app. I have the greenpower battery saver, but I don't know if you can get that specific one on the iPhone. One app that I would stray away from is a platinum anti-virus app (it's name is similar to that, anyway). This app will scan your phone and use the information to hijack the phone and eventually lock it up completely. It will then ask for a $100 ransom to get back into your phone. At that point, you're screwed. Anyway, that is what I suggest! Hope I helped!

Tracker app = Find My iPhone
To take a picture of them, you have to jailbreak, go to Cydia, and search for "ICaughtU"