In the latest round of leaked OS 188.8.131.522 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 184.108.40.2062
Welcome to leak Friday! We have a leaked OS for the BlackBerry Torch 9860, 9850 OS 220.127.116.112.