Show me how to use in-app purchase.
To be able to use I phone free game without be charge for it.
iPhone 5, iOS 5.0.1
If the game is free, then you can use it without charge, though many "free" games have only basic features, only a couple of levels of play, or other such limitations, and charge you to access those addional levels or features.
If that does not answer your question, please post back. You may wish to try posting in your native language.
Regards.