In the latest round of leaked OS 18.104.22.1682 for the the mainstream BlackBerry smartphones includes a Parental Controls option. In this feature you have the ability to limit incoming calls to only the contacts in the address book as well as enabling or disabling features like:
Welcome to leak Friday! We have a leaked OS for the BlackBerry Curve 9370 OS 22.214.171.1242
Welcome to leak Friday! We have a leaked OS for the BlackBerry Torch 9860, 9850 OS 126.96.36.1992.