Hey there iPhone owning parent who let’s their kids play ostensibly “free” games on their phone. Don’t get trapped with charges for Pearls and Hoes and who knows what kind of virtual goods your kids might buy. There is an easy (although very hidden) way to prevent your sticky fingered kids from buying stuff within an application.
First, go to your Settings and make sure you’ve got Restrictions turned on. You’ll have to provide a 4-digit code to turn on and later change restrictions.
Now in the Restrictions area make sure that In App Purchases is turned off and adjust any other Movie or Music settings you’d like to change.
That should do it.