If you are someone who would like to ensure more security on their iPhone, then you really should look into jailbreaking. The Cydia store contains a number of advanced packages that can actually assist in securing your device. One of the latest packages to be added to the jailbreak store is called iPrivacy. This tweak attempts to take a leaf out of the desktop OS book by introducing a usable guest mode onto all jailbroken iOS devices.
This tweak comes about as the number of people who share their devices with friends and family increases. You probably don't mind people flicking through your apps or playing Angry Birds but you don't want them going through your photos or text messages. This tweak is also going to be really useful if you lose your iOS device as it will protect the data you have stored on it.
When the �Guest Mode� of this package is activated, the tweak requires a different passcode to be given to guests so that specific things are protected from their view. The back-end of iPrivacy is where the real power is and this is all built around the installation of individual plugins that allow users to protect specific parts of their device. Different levels of protection can be set for each plugin installed and this results in the perfect protection for things like messages, photos and even incoming notifications.
Once you download and install iPrivacy, it won't matter if someone resprings your device, reboots it or even powers it off and back on again, they will never be able to access prohibited parts of your device. This really is a great privacy tool and it is available to download from the BigBoss repository. It is compatible with the iPhone, iPod Touch and iPad all running iOS 5 and above.