This iPhone tip lets you choose which applications. If you given the iPhone to someone for playing a game, you can keep avoid person, from going to Safari, photos with your camera or make such songs with offensive lyrics listen.
There are two places where you can set it: in iTunes on the desktop and the iPhone itself. On the iPhone itself, you find under Settings> General> Restrictions on the ability to block certain functions.
Tap "Turn restrictions' to parental control switch. Switches to tell it which applications and activities are permitted. You need to have a 4-digit PIN.
In iPhone OS 1.x and 2.x can only indicate whether you via the iPod application may listen to music with explicit lyrics. In iPhone OS 3.x and higher are the possibilities expanded. You can also specify whether it applies to music and podcasts limitation, films, television programs and applications. For applications Indicates if they are suitable for 4 +, 9 +, 12 + or 17 +. Block All or Allow All is possible:
When browsing the iTunes Store on your desktop you can also choose what content you can and can not see. Do this in the settings tab under the Parental Control: